{"id":13305,"date":"2026-07-30T11:05:56","date_gmt":"2026-07-30T09:05:56","guid":{"rendered":"https:\/\/lubeteam.it\/prodotto\/stauff-stacking-bolt-stacking-stud-type-af-twin-series\/"},"modified":"2026-08-07T09:54:50","modified_gmt":"2026-08-07T07:54:50","slug":"stauff-stacking-bolt-stacking-stud-type-af-twin-series","status":"publish","type":"product","link":"https:\/\/lubeteam.it\/en\/product\/stauff-stacking-bolt-stacking-stud-type-af-twin-series\/","title":{"rendered":"STAUFF Stacking Bolt \/ Stacking Stud (Type AF &#8211; Twin Series)"},"content":{"rendered":"<h3>Operating Principles and Use<\/h3>\n<p>The <strong>STAUFF Stacking Bolt \/ Stacking Stud (Type AF &#8211; Twin Series)<\/strong> is a fundamental component in modular fastening systems for rigid pipes and hoses used in hydraulic and fluid power installations. The specific Type AF design is intended to enable the vertical stacking of multiple clamp levels belonging to the Twin Series, in accordance with DIN 3015, Part 3.<\/p>\n<p>The Type AF stacking stud allows two or more clamp bodies to be installed one above the other while maintaining perfect axial and structural alignment of the assembly. To ensure secure and effective locking and prevent accidental loosening caused by mechanical loads or pressure pulsations, the stacking bolt must be used in combination with STAUFF Type SI or SIV safety locking plates.<\/p>\n<h3>Construction Features and Materials<\/h3>\n<p>STAUFF Type AF stacking studs are manufactured to strict dimensional tolerances to ensure complete interchangeability and reliable mechanical performance. Thread options include ISO metric threads, designated by the letter M, and Unified Coarse UNC threads, designated by the letter U.<\/p>\n<p>Available material and surface-finish options include:<\/p>\n<ul>\n<li><strong>W3 Carbon Steel:<\/strong> Zinc\/nickel-plated for long-lasting corrosion protection in standard industrial environments.<\/li>\n<li><strong>V2A Stainless Steel (Code W4):<\/strong> Corresponding to material grades 1.4301 \/ 1.4305 (AISI 304 \/ 303), suitable for moderately aggressive environments or industries with hygiene requirements.<\/li>\n<li><strong>V4A Stainless Steel (Code W5):<\/strong> Corresponding to material grades 1.4401 \/ 1.4571 (AISI 316 \/ 316 Ti), specifically intended for highly corrosive environments, marine exposure or chemical-industry applications.<\/li>\n<\/ul>\n<h3>Compatibility and Dimensions<\/h3>\n<p>The stacking studs cover STAUFF Groups 1D to 5D, corresponding to DIN Groups 1 to 5 of the Twin Series. The range includes the following geometric and dimensional specifications:<\/p>\n<ul>\n<li><strong>Group 1D (DIN 1):<\/strong> M6 or 1\/4-20 UNC thread; spanner width (SW) of 11 mm for M6 or 7\/16 in (11 mm \/ 0.43 in for UNC); total length L1 of 34 mm and 1.33 in respectively; shank length L2 of 20 mm and 0.78 in; minimum usable thread depth L3 of 12 mm and 0.47 in.<\/li>\n<li><strong>Group 2D (DIN 2):<\/strong> M8 or 5\/16-18 UNC thread; spanner width (SW) of 12 mm \/ 0.47 in; length L1 of 33 mm and 1.30 in; length L2 of 20 mm and 0.78 in; minimum thread depth L3 of 12 mm and 0.47 in.<\/li>\n<li><strong>Group 3D (DIN 3):<\/strong> M8 or 5\/16-18 UNC thread; spanner width (SW) of 12 mm \/ 0.47 in; length L1 of 44 mm and 1.73 in; length L2 of 29 mm and 1.14 in; minimum thread depth L3 of 12 mm and 0.47 in.<\/li>\n<li><strong>Group 4D (DIN 4):<\/strong> M8 or 5\/16-18 UNC thread; spanner width (SW) of 12 mm \/ 0.47 in; length L1 of 49 mm and 1.92 in; length L2 of 34 mm and 1.33 in; minimum thread depth L3 of 12 mm and 0.47 in.<\/li>\n<li><strong>Group 5D (DIN 5):<\/strong> M8 or 5\/16-18 UNC thread; spanner width (SW) of 12 mm \/ 0.47 in; length L1 of 61 mm and 2.40 in; length L2 of 46 mm and 1.81 in; minimum thread depth L3 of 12 mm and 0.47 in.<\/li>\n<\/ul>\n<h3>Summary Technical Table of the Main Features of the STAUFF Stacking Bolt \/ Stacking Stud (Type AF &#8211; Twin Series)<\/h3>\n<div style=\"width: 100%; overflow-x: auto;\">\n<table style=\"width: 100%; border-collapse: collapse;\">\n<thead>\n<tr>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left; background-color: #F2F2F2;\">Feature<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left; background-color: #F2F2F2;\">Value<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">Reference Standard<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">DIN 3015, Part 3 (Twin Series)<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">Component Type<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">Stacking Stud \/ Stacking Bolt (Type AF)<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">Required Locking Accessories<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">Type SI \/ SIV Safety Locking Plates<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">Covered STAUFF Groups<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">1D, 2D, 3D, 4D, 5D (DIN 1 to 5)<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">Thread Types<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">ISO Metric (M6, M8) and Unified Coarse UNC (1\/4-20 UNC, 5\/16-18 UNC)<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">Material W3 (Standard)<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">Zinc\/nickel-plated carbon steel<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">Material W4 (Optional)<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">V2A Stainless Steel 1.4301 \/ 1.4305 (AISI 304 \/ 303)<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">Material W5 (Optional)<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">V4A Stainless Steel 1.4401 \/ 1.4571 (AISI 316 \/ 316 Ti)<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<h3>Product Codes<\/h3>\n<div style=\"width: 100%; overflow-x: auto;\">\n<table style=\"width: 100%; border-collapse: collapse;\">\n<thead>\n<tr>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left; background-color: #F2F2F2;\">Model \/ Order Code<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left; background-color: #F2F2F2;\">STAUFF Group<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left; background-color: #F2F2F2;\">DIN Group<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left; background-color: #F2F2F2;\">Thread G<\/th>\n<th style=\"border: 1px solid #ddd; padding: 8px; text-align: left; background-color: #F2F2F2;\">Material \/ Finish<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">AF1-\/1A\/1D-M-W3<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">1D<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">1<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">M6<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">Zinc\/nickel-plated carbon steel (W3)<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">AF-1\/1A\/1D-U-W3<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">1D<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">1<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">1\/4-20 UNC<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">Zinc\/nickel-plated carbon steel (W3)<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">AF-2D-M-W3<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">2D<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">2<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">M8<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">Zinc\/nickel-plated carbon steel (W3)<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">AF-2D-U-W3<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">2D<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">2<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">5\/16-18 UNC<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">Zinc\/nickel-plated carbon steel (W3)<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">AF-3D-M-W3<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">3D<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">3<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">M8<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">Zinc\/nickel-plated carbon steel (W3)<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">AF-3D-U-W3<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">3D<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">3<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">5\/16-18 UNC<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">Zinc\/nickel-plated carbon steel (W3)<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">AF-4D-M-W3<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">4D<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">4<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">M8<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">Zinc\/nickel-plated carbon steel (W3)<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">AF-4D-U-W3<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">4D<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">4<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">5\/16-18 UNC<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">Zinc\/nickel-plated carbon steel (W3)<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">AF-5D-M-W3<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">5D<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">5<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">M8<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">Zinc\/nickel-plated carbon steel (W3)<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">AF-5D-U-W3<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">5D<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">5<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">5\/16-18 UNC<\/td>\n<td style=\"border: 1px solid #ddd; padding: 8px;\">Zinc\/nickel-plated carbon steel (W3)<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n","protected":false},"excerpt":{"rendered":"<p data-path-to-node=\"7\">The <b data-path-to-node=\"7\" data-index-in-node=\"3\">STAUFF Stacking Bolt \/ Stacking Stud (Type AF &#8211; Twin Series)<\/b> is designed to enable the stacking and multi-level fastening of pipe clamps in accordance with DIN 3015, Part 3 (Twin Series). Used in combination with Type SI \/ SIV safety locking plates, it ensures the mechanical stability of the hydraulic system under vibration. Manufactured from zinc\/nickel-plated carbon steel (W3), V2A stainless steel (W4) or V4A stainless steel (W5), it is available with ISO metric or UNC threads.<\/p>\n<p data-path-to-node=\"8\">The available product codes are: AF1-\/1A\/1D-M-W3, AF-1\/1A\/1D-U-W3, AF-2D-M-W3, AF-2D-U-W3, AF-3D-M-W3, AF-3D-U-W3, AF-4D-M-W3, AF-4D-U-W3, AF-5D-M-W3, AF-5D-U-W3.<\/p>\n","protected":false},"featured_media":12885,"template":"","meta":{"_joinchat":[]},"product_brand":[],"product_cat":[101,470],"product_tag":[281],"class_list":{"0":"post-13305","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-clamps","7":"product_cat-din-3015-clamps","8":"product_tag-stauff","10":"first","11":"instock","12":"shipping-taxable","13":"product-type-simple"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v26.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>STAUFF Stacking Bolt \/ Stacking Stud (Type AF - Twin Series) \u2013 LubeTeam Hydraulic<\/title>\n<meta name=\"description\" content=\"STAUFF Type AF Stacking Stud for the Twin Series, compliant with DIN 3015-3 and designed for multi-level clamp assemblies. Available with M6, M8 and UNC threads in W3, W4 and W5 materials.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/lubeteam.it\/en\/product\/stauff-stacking-bolt-stacking-stud-type-af-twin-series\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"STAUFF Stacking Bolt \/ Stacking Stud (Type AF - Twin Series)\" \/>\n<meta property=\"og:description\" content=\"STAUFF Type AF Stacking Stud for the Twin Series, compliant with DIN 3015-3 and designed for multi-level clamp assemblies. 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