{"id":1433,"date":"2026-09-22T03:13:28","date_gmt":"2026-09-22T03:13:28","guid":{"rendered":"https:\/\/www.spoutcaps.com\/?p=1433"},"modified":"2026-09-22T03:25:25","modified_gmt":"2026-09-22T03:25:25","slug":"spout-cap-anatomy-parts-sizes-compatibility","status":"publish","type":"post","link":"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/","title":{"rendered":"\u51fa\u6db2\u53e3\u76d6\u7ed3\u6784\u89e3\u6790\uff1a\u51fa\u6db2\u53e3\u3001\u76d6\u3001\u87ba\u7eb9\u3001\u6cd5\u5170\u3001\u5185\u5f84\u5c3a\u5bf8\u53ca\u517c\u5bb9\u6027"},"content":{"rendered":"<p class=\"wp-block-paragraph\">A spout cap is more than a plastic closure with an opening. Its <strong>cap, spout, thread, flange, and bore<\/strong> each serve a different function, and their dimensions determine whether the closure works with a specific bottle, pouch, or other package.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is particularly important when comparing a <strong>plastic cap spout<\/strong> or specifying <strong>cap spout plastic<\/strong> components. A nominal size such as 20 mm does not necessarily describe the dispensing opening. Buyers need to distinguish the <strong>closure or neck dimension<\/strong> from the <strong>bore size<\/strong> and thread specification.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u76ee\u5f55<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">\u5207\u6362<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#What_Are_the_Main_Parts_of_a_Spout_Cap\" >What Are the Main Parts of a Spout Cap?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#Cap\" >Cap<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#Spout\" >Spout<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#Thread\" >Thread<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#Flange_and_Sealing_Area\" >Flange and Sealing Area<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#Bore_or_Orifice\" >Bore or Orifice<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#What_Does_%E2%80%9CXX_mm%E2%80%9D_Mean_on_a_Spout_Cap\" >What Does \u201cXX mm\u201d Mean on a Spout Cap?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#Nominal_Neck_or_Closure_Diameter\" >Nominal Neck or Closure Diameter<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#Bore_or_Orifice_Diameter\" >Bore or Orifice Diameter<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#Why_%E2%80%9C20_mm_Cap%E2%80%9D_Does_Not_Automatically_Mean_a_20_mm_Bore\" >Why \u201c20 mm Cap\u201d Does Not Automatically Mean a 20 mm Bore<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#How_Do_Threads_Determine_Spout_Cap_Compatibility\" >How Do Threads Determine Spout Cap Compatibility?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#Neck_Diameter_and_Thread_Specification_Work_Together\" >Neck Diameter and Thread Specification Work Together<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#Thread_Compatibility_Is_More_Than_Diameter\" >Thread Compatibility Is More Than Diameter<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#Why_a_Similar-Diameter_Cap_May_Still_Be_Incompatible\" >Why a Similar-Diameter Cap May Still Be Incompatible<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#What_Is_the_Role_of_the_Flange_and_Sealing_Area\" >What Is the Role of the Flange and Sealing Area?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#Flange_as_a_Structural_and_Sealing_Interface\" >Flange as a Structural and Sealing Interface<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#Flange_Geometry_Affects_the_Interface\" >Flange Geometry Affects the Interface<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#Why_Flange_Dimensions_Matter_for_Custom_Closures\" >Why Flange Dimensions Matter for Custom Closures<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#How_Does_Bore_Size_Affect_Dispensing_Liquids\" >How Does Bore Size Affect Dispensing Liquids?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#Bore_Size_Controls_the_Product_Passage\" >Bore Size Controls the Product Passage<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#Smaller_Bore_for_More_Controlled_Dispensing\" >Smaller Bore for More Controlled Dispensing<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#Larger_Bore_for_Higher_Flow_Requirements\" >Larger Bore for Higher Flow Requirements<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#Bore_Size_Is_Separate_From_Cap_Size\" >Bore Size Is Separate From Cap Size<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#How_Do_All_Spout_Cap_Dimensions_Work_Together\" >How Do All Spout Cap Dimensions Work Together?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#Closure_Diameter\" >Closure Diameter<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#Thread_Specification\" >Thread Specification<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#Flange_and_Sealing_Geometry\" >Flange and Sealing Geometry<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#Bore_Size\" >Bore Size<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#Spout_Cap_Anatomy_and_Size_Reference_Table\" >Spout Cap Anatomy and Size Reference Table<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#How_to_Read_a_Spout_Cap_Specification_Before_Ordering\" >How to Read a Spout Cap Specification Before Ordering<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/www.spoutcaps.com\/zh\/spout-cap-anatomy-parts-sizes-compatibility\/#Conclusion\" >\u7ed3\u8bba<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Are_the_Main_Parts_of_a_Spout_Cap\"><\/span>What Are the Main Parts of a Spout Cap?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A typical spout cap assembly can be understood through several key components.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cap\"><\/span>Cap<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The cap is the closure component that covers the dispensing opening. Depending on the design, it may be a screw cap, flip-top cap, or another closure structure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Its dimensions and closure mechanism must correspond to the spout or container neck.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Spout\"><\/span>Spout<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The spout provides the passage through which the packaged product is dispensed. Its external structure connects with the cap, while its internal opening determines the available flow passage.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Thread\"><\/span>Thread<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Threads allow a screw cap to engage with the corresponding threaded neck. Thread compatibility depends on more than simply measuring the outside diameter.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Packaging specifications commonly identify closures using formats such as <strong>20\/410<\/strong>, where the numbers distinguish the nominal neck diameter and thread specification.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Flange_and_Sealing_Area\"><\/span>Flange and Sealing Area<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The flange or sealing area provides a structural interface between the closure and the packaging component. Its exact function and geometry depend on the specific spout design.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For custom closures, flange dimensions need to correspond to the mating bottle, pouch, or other packaging structure.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Bore_or_Orifice\"><\/span>Bore or Orifice<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The bore, or dispensing orifice, is the opening through which the product passes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This dimension should be considered separately from the nominal cap or neck diameter because the two measurements serve different purposes.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1959\" height=\"1102\" src=\"https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/05\/wholesale-spout-cap-with-different-thread-design.webp\" alt=\"\u6279\u53d1\u5404\u79cd\u87ba\u7eb9\u8bbe\u8ba1\u7684\u51fa\u6db2\u53e3\u76d6\" class=\"wp-image-1222\" srcset=\"https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/05\/wholesale-spout-cap-with-different-thread-design.webp 1959w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/05\/wholesale-spout-cap-with-different-thread-design-300x169.webp 300w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/05\/wholesale-spout-cap-with-different-thread-design-768x432.webp 768w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/05\/wholesale-spout-cap-with-different-thread-design-18x10.webp 18w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/05\/wholesale-spout-cap-with-different-thread-design-1200x675.webp 1200w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/05\/wholesale-spout-cap-with-different-thread-design-600x338.webp 600w\" sizes=\"(max-width: 1959px) 100vw, 1959px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Does_%E2%80%9CXX_mm%E2%80%9D_Mean_on_a_Spout_Cap\"><\/span>What Does \u201cXX mm\u201d Mean on a Spout Cap?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The term <strong>&#8221; XX mm &#8221; on caps<\/strong> can be misleading because the stated millimeter measurement does not always represent the dispensing opening.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Nominal_Neck_or_Closure_Diameter\"><\/span>Nominal Neck or Closure Diameter<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In many packaging specifications, the nominal millimeter dimension identifies the neck or closure system.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For example, a commercial 20\/410 spout cap specification identifies a <strong>20 mm neck diameter<\/strong> \u4ee5\u53ca <strong>410 thread<\/strong>, while separately specifying a <strong>7.6 mm orifice<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Therefore:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>20 mm closure size \u2260 20 mm dispensing bore<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Bore_or_Orifice_Diameter\"><\/span>Bore or Orifice Diameter<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The bore is the actual opening through which the product exits.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Its size affects the available flow passage and should be specified separately when dispensing performance is important.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_%E2%80%9C20_mm_Cap%E2%80%9D_Does_Not_Automatically_Mean_a_20_mm_Bore\"><\/span>Why \u201c20 mm Cap\u201d Does Not Automatically Mean a 20 mm Bore<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">When a supplier describes a product as a \u201c20 mm cap,\u201d the buyer should confirm what the 20 mm refers to.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A specification can contain several independent dimensions:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Neck\/closure diameter \u2192 thread specification \u2192 bore\/orifice diameter<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This distinction prevents incorrect comparisons between different xx mm caps.<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1124\" height=\"1124\" data-id=\"1131\" src=\"https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/travel-pouch-with-8.6mm-spout-cap.webp\" alt=\"travel pouch with 8.6mm spout cap\" class=\"wp-image-1131\" srcset=\"https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/travel-pouch-with-8.6mm-spout-cap.webp 1124w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/travel-pouch-with-8.6mm-spout-cap-300x300.webp 300w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/travel-pouch-with-8.6mm-spout-cap-150x150.webp 150w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/travel-pouch-with-8.6mm-spout-cap-768x768.webp 768w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/travel-pouch-with-8.6mm-spout-cap-12x12.webp 12w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/travel-pouch-with-8.6mm-spout-cap-600x600.webp 600w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/travel-pouch-with-8.6mm-spout-cap-100x100.webp 100w\" sizes=\"(max-width: 1124px) 100vw, 1124px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1124\" height=\"1124\" data-id=\"1132\" src=\"https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/fruit-juice-pouch-with-10mm-spout-cap.webp\" alt=\"fruit juice pouch with 10mm spout cap\" class=\"wp-image-1132\" srcset=\"https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/fruit-juice-pouch-with-10mm-spout-cap.webp 1124w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/fruit-juice-pouch-with-10mm-spout-cap-300x300.webp 300w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/fruit-juice-pouch-with-10mm-spout-cap-150x150.webp 150w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/fruit-juice-pouch-with-10mm-spout-cap-768x768.webp 768w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/fruit-juice-pouch-with-10mm-spout-cap-12x12.webp 12w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/fruit-juice-pouch-with-10mm-spout-cap-600x600.webp 600w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/fruit-juice-pouch-with-10mm-spout-cap-100x100.webp 100w\" sizes=\"(max-width: 1124px) 100vw, 1124px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1124\" height=\"1124\" data-id=\"1133\" src=\"https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/mixed-fruit-blends-pouch-with-a-16mm-spout-cap.webp\" alt=\"mixed fruit blends pouch with a 16mm spout cap\" class=\"wp-image-1133\" srcset=\"https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/mixed-fruit-blends-pouch-with-a-16mm-spout-cap.webp 1124w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/mixed-fruit-blends-pouch-with-a-16mm-spout-cap-300x300.webp 300w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/mixed-fruit-blends-pouch-with-a-16mm-spout-cap-150x150.webp 150w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/mixed-fruit-blends-pouch-with-a-16mm-spout-cap-768x768.webp 768w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/mixed-fruit-blends-pouch-with-a-16mm-spout-cap-12x12.webp 12w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/mixed-fruit-blends-pouch-with-a-16mm-spout-cap-600x600.webp 600w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/mixed-fruit-blends-pouch-with-a-16mm-spout-cap-100x100.webp 100w\" sizes=\"(max-width: 1124px) 100vw, 1124px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"800\" height=\"600\" data-id=\"1135\" src=\"https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/best-spout-cap-for-pouch-8.6mm-10mm-16mm.webp\" alt=\"\u6700\u9002\u5408\u7acb\u5f0f\u888b\u7684\u6ce8\u5634\u76d6\u2014\u20148.6\u6beb\u7c73\u300110\u6beb\u7c73\u300116\u6beb\u7c73\" class=\"wp-image-1135\" srcset=\"https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/best-spout-cap-for-pouch-8.6mm-10mm-16mm.webp 800w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/best-spout-cap-for-pouch-8.6mm-10mm-16mm-300x225.webp 300w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/best-spout-cap-for-pouch-8.6mm-10mm-16mm-768x576.webp 768w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/best-spout-cap-for-pouch-8.6mm-10mm-16mm-16x12.webp 16w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/04\/best-spout-cap-for-pouch-8.6mm-10mm-16mm-600x450.webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n<\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Do_Threads_Determine_Spout_Cap_Compatibility\"><\/span>How Do Threads Determine Spout Cap Compatibility?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A cap needs to match the corresponding threaded neck or spout. Diameter alone is therefore not enough to determine whether two components are interchangeable.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Neck_Diameter_and_Thread_Specification_Work_Together\"><\/span>Neck Diameter and Thread Specification Work Together<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A closure specification may combine a nominal diameter with a thread designation, such as 20\/410. Other packaging closures are also specified using different diameter\/thread combinations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The first part generally identifies the nominal neck size, while the thread designation identifies the corresponding thread system.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Thread_Compatibility_Is_More_Than_Diameter\"><\/span>Thread Compatibility Is More Than Diameter<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Compatibility can depend on:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Nominal diameter<\/li>\n\n\n\n<li>Thread specification<\/li>\n\n\n\n<li>\u87ba\u7eb9\u51e0\u4f55\u5f62\u72b6<\/li>\n\n\n\n<li>\u87ba\u7eb9\u556e\u5408<\/li>\n\n\n\n<li>\u5bc6\u5c01\u7ed3\u6784<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Two components may have similar nominal diameters but still use different thread systems.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_a_Similar-Diameter_Cap_May_Still_Be_Incompatible\"><\/span>Why a Similar-Diameter Cap May Still Be Incompatible<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A useful rule is:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Similar diameter does not necessarily mean compatible closure.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When selecting a <strong>spout cap bottle<\/strong> combination, the complete neck finish or thread specification should be matched rather than relying only on a millimeter measurement.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Is_the_Role_of_the_Flange_and_Sealing_Area\"><\/span>What Is the Role of the Flange and Sealing Area?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The flange is part of the interface between the spout or closure and the packaging structure.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Flange_as_a_Structural_and_Sealing_Interface\"><\/span>Flange as a Structural and Sealing Interface<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Depending on the design, the flange can provide the contact area required to attach or seal the spout to the packaging component.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Its function therefore depends on the specific construction of the <strong>plastic cap spout<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Flange_Geometry_Affects_the_Interface\"><\/span>Flange Geometry Affects the Interface<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The flange&#8217;s dimensions and shape determine how it contacts the mating component.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For a pouch spout, for example, the attachment area needs to correspond with the pouch structure and sealing method.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_Flange_Dimensions_Matter_for_Custom_Closures\"><\/span>Why Flange Dimensions Matter for Custom Closures<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">When developing a <strong>cap spout plastic<\/strong> component, changing the flange can change how the component interfaces with the package.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For this reason, flange dimensions should be considered together with the overall spout geometry rather than treated as an isolated measurement.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Does_Bore_Size_Affect_Dispensing_Liquids\"><\/span>How Does Bore Size Affect Dispensing Liquids?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The bore determines the internal passage available for the product.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Bore_Size_Controls_the_Product_Passage\"><\/span>Bore Size Controls the Product Passage<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A smaller bore provides a smaller flow passage, while a larger bore provides greater available flow area.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The appropriate size depends on the product and desired dispensing behavior.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Smaller_Bore_for_More_Controlled_Dispensing\"><\/span>Smaller Bore for More Controlled Dispensing<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">For suitable low-viscosity products, a smaller opening can provide more controlled dispensing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is a general relationship rather than a universal specification.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Larger_Bore_for_Higher_Flow_Requirements\"><\/span>Larger Bore for Higher Flow Requirements<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A larger opening can provide greater flow capacity and may be appropriate when a product requires easier dispensing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Product viscosity, formulation, and dispensing method should therefore be considered before selecting the bore.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Bore_Size_Is_Separate_From_Cap_Size\"><\/span>Bore Size Is Separate From Cap Size<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The distinction is fundamental:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cap\/neck size \u2192 packaging compatibility<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Bore size \u2192 dispensing passage<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Commercial spout specifications can list these dimensions separately. For example, one 13 mm pouch spout specification identifies an inner diameter separately from the overall spout and cap dimensions.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1959\" height=\"1102\" src=\"https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/07\/pouring-juice-from-spout-pouch.webp\" alt=\"\u4ece\u5e26\u5634\u7684\u8f6f\u5305\u88c5\u888b\u4e2d\u5012\u679c\u6c41\" class=\"wp-image-1330\" srcset=\"https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/07\/pouring-juice-from-spout-pouch.webp 1959w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/07\/pouring-juice-from-spout-pouch-300x169.webp 300w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/07\/pouring-juice-from-spout-pouch-768x432.webp 768w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/07\/pouring-juice-from-spout-pouch-18x10.webp 18w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/07\/pouring-juice-from-spout-pouch-1200x675.webp 1200w, https:\/\/www.spoutcaps.com\/wp-content\/uploads\/2026\/07\/pouring-juice-from-spout-pouch-600x338.webp 600w\" sizes=\"(max-width: 1959px) 100vw, 1959px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Do_All_Spout_Cap_Dimensions_Work_Together\"><\/span>How Do All Spout Cap Dimensions Work Together?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The different dimensions should be viewed as one connected closure system.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Closure_Diameter\"><\/span>Closure Diameter<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The nominal closure or neck diameter identifies the general size of the mating interface.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Thread_Specification\"><\/span>Thread Specification<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The thread determines how the cap engages with the corresponding threaded neck or spout.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Flange_and_Sealing_Geometry\"><\/span>Flange and Sealing Geometry<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The flange and sealing structures determine how the components establish their physical interface with the package.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Bore_Size\"><\/span>Bore Size<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The bore determines the dispensing passage and therefore has a different function from the closure diameter.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The overall relationship can be summarized as:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Neck\/closure diameter \u2192 thread compatibility \u2192 sealing interface \u2192 bore size \u2192 dispensing function<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A correct specification therefore requires more than one measurement.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Spout_Cap_Anatomy_and_Size_Reference_Table\"><\/span>Spout Cap Anatomy and Size Reference Table<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Term<\/th><th>What it describes<\/th><th>Why it matters<\/th><\/tr><\/thead><tbody><tr><td>Cap diameter<\/td><td>Nominal closure\/neck dimension<\/td><td>Identifies the general closure size<\/td><\/tr><tr><td>Thread<\/td><td>Screw-engagement specification<\/td><td>Determines cap-to-neck compatibility<\/td><\/tr><tr><td>Spout<\/td><td>\u7ed9\u836f\u7ed3\u6784<\/td><td>Provides the product outlet<\/td><\/tr><tr><td>Flange<\/td><td>Structural\/sealing interface<\/td><td>Supports attachment and sealing<\/td><\/tr><tr><td>Bore\/orifice<\/td><td>Internal dispensing opening<\/td><td>Influences product flow<\/td><\/tr><tr><td>Overall cap size<\/td><td>External dimensions<\/td><td>Affects packaging and handling<\/td><\/tr><tr><td>Neck finish<\/td><td>Complete neck\/closure specification<\/td><td>Defines the mating compatibility<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The exact terminology and measurement method can vary between manufacturers. A technical drawing or complete product specification should therefore take precedence over a general label such as \u201c20 mm cap.\u201d<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Read_a_Spout_Cap_Specification_Before_Ordering\"><\/span>How to Read a Spout Cap Specification Before Ordering<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Before selecting a <strong>spout cap bottle<\/strong> or other closure, review the complete specification rather than one nominal dimension.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Confirm the Closure Size<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Determine exactly what the stated millimeter measurement represents: neck diameter, closure diameter, or another dimension.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Confirm the Thread Specification<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Check the complete thread designation rather than assuming that equal diameters indicate compatibility.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Confirm the Bore Size<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Identify the actual dispensing opening separately from the cap or neck size.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Confirm the Mating Packaging Component<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For bottles, check the corresponding neck finish. For pouches, check the compatible spout and attachment structure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Request a Technical Drawing When Dimensions Are Unclear<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A technical drawing can show the dimensions and interfaces that may not be included in a short product name.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A practical specification sequence is:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Nominal size \u2192 thread \u2192 bore \u2192 sealing interface \u2192 mating component<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This gives both the buyer and manufacturer a clearer basis for confirming compatibility.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>\u7ed3\u8bba<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Understanding <strong>plastic cap spout<\/strong> anatomy starts with distinguishing the functions of the cap, spout, thread, flange, and bore.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The most important points are:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Cap\/neck diameter<\/strong> is not necessarily the <strong>bore size<\/strong>.<\/li>\n\n\n\n<li><strong>Thread specification<\/strong> is essential for closure compatibility.<\/li>\n\n\n\n<li><strong>Flange geometry<\/strong> forms part of the structural or sealing interface.<\/li>\n\n\n\n<li><strong>Bore size<\/strong> relates to product dispensing rather than simply package fit.<\/li>\n\n\n\n<li><strong>XX mm caps<\/strong> should always be interpreted according to the manufacturer&#8217;s stated measurement.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For a bottle, pouch, or other package, the complete closure specification should therefore be checked before selecting a compatible spout cap.<\/p>","protected":false},"excerpt":{"rendered":"<p>A spout cap is more than a plastic closure with an opening. Its cap, spout, thread, flange, and bore each serve a different function, and their dimensions determine whether the closure works with a specific bottle, pouch, or other package. This is particularly important when comparing a plastic cap spout or specifying cap spout plastic [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1442,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","_members_access_role":[],"_members_access_error":""},"categories":[22],"tags":[],"class_list":["post-1433","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blogs-news"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.spoutcaps.com\/zh\/wp-json\/wp\/v2\/posts\/1433","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.spoutcaps.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.spoutcaps.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.spoutcaps.com\/zh\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.spoutcaps.com\/zh\/wp-json\/wp\/v2\/comments?post=1433"}],"version-history":[{"count":7,"href":"https:\/\/www.spoutcaps.com\/zh\/wp-json\/wp\/v2\/posts\/1433\/revisions"}],"predecessor-version":[{"id":1440,"href":"https:\/\/www.spoutcaps.com\/zh\/wp-json\/wp\/v2\/posts\/1433\/revisions\/1440"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.spoutcaps.com\/zh\/wp-json\/wp\/v2\/media\/1442"}],"wp:attachment":[{"href":"https:\/\/www.spoutcaps.com\/zh\/wp-json\/wp\/v2\/media?parent=1433"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.spoutcaps.com\/zh\/wp-json\/wp\/v2\/categories?post=1433"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.spoutcaps.com\/zh\/wp-json\/wp\/v2\/tags?post=1433"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}