{"id":13304,"date":"2026-07-30T11:05:54","date_gmt":"2026-07-30T09:05:54","guid":{"rendered":"https:\/\/lubeteam.it\/prodotto\/stauff-hexagon-socket-head-cap-screw-type-is-twin-series\/"},"modified":"2026-08-07T09:54:27","modified_gmt":"2026-08-07T07:54:27","slug":"stauff-hexagon-socket-head-cap-screw-type-is-twin-series","status":"publish","type":"product","link":"https:\/\/lubeteam.it\/en\/product\/stauff-hexagon-socket-head-cap-screw-type-is-twin-series\/","title":{"rendered":"STAUFF Hexagon Socket Head Cap Screw (Type IS – Twin Series)"},"content":{"rendered":"

STAUFF Hexagon Socket Head Cap Screw (Type IS – Twin Series)<\/h2>\n

The STAUFF Hexagon Socket Head Cap Screw (Type IS – Twin Series)<\/strong> is a high-precision fastening solution developed specifically for use in clamp systems and hydraulic installations in accordance with DIN 3015, Part 3. This series of socket head cap screws (Type IS) is designed to provide reliable and durable fastening while maintaining the structural integrity of hydraulic systems and pipework.<\/p>\n

Design and Regulatory Compliance<\/h3>\n

STAUFF Twin Series screws are manufactured in strict compliance with international industry standards. The hexagon socket head design complies with ISO 4762 and ANSI\/ASME B18.3. The use and dimensions of these screws are specifically intended and approved for installation in combination with the Type GD Cover Plate. Compliance with DIN 3015, Part 3, ensures full interchangeability and integration into standardised clamp systems for hydraulic applications.<\/p>\n

Construction Features and Materials<\/h3>\n

To meet different environmental and operating requirements, Type IS screws are available in three distinct material versions, each identified by a specific suffix in the order code:<\/p>\n

    \n
  • W3<\/strong>: Zinc\/nickel-plated carbon steel. This standard option provides reliable mechanical strength and basic protection.<\/li>\n
  • W4<\/strong>: V2A stainless steel. Corresponds to material grades 1.4301 and 1.4305 (AISI 304 \/ 303). Suitable for environments exposed to atmospheric and chemical agents.<\/li>\n
  • W5<\/strong>: V4A stainless steel. Corresponds to material grades 1.4401 and 1.4571 (AISI 316 \/ 316 Ti). This alloy provides maximum resistance and is suitable for critical applications requiring the highest level of durability.<\/li>\n<\/ul>\n

    Alternative materials and customised surface finishes are also available upon specific request, providing extensive customisation options for special projects.<\/p>\n

    Threads and Dimensional Compatibility<\/h3>\n

    Installation flexibility is ensured by the availability of threaded components with either ISO metric threads or Unified Coarse (UNC) threads. The size groups cover the technical range classified according to STAUFF Groups 1D to 5D and DIN Groups 1 to 5:<\/p>\n

      \n
    • Group 1D (DIN 1)<\/strong>: M6 x 35 and 1\/4-20 UNC x 1-3\/8 threads.<\/li>\n
    • Group 2D (DIN 2)<\/strong>: M8 x 35 and 5\/16-18 UNC x 1-3\/8 threads.<\/li>\n
    • Group 3D (DIN 3)<\/strong>: M8 x 45 and 5\/16-18 UNC x 1-3\/4 threads.<\/li>\n
    • Group 4D (DIN 4)<\/strong>: M8 x 50 and 5\/16-18 UNC x 2 threads.<\/li>\n
    • Group 5D (DIN 5)<\/strong>: M8 x 60 and 5\/16-18 UNC x 2-1\/2 threads.<\/li>\n<\/ul>\n

      Order Code Structure<\/h3>\n

      The STAUFF product coding system allows the technical specifications of the screw to be identified quickly and accurately. Taking the code IS-M8x35-W3<\/strong> as an example, the structure can be divided into three key elements:<\/p>\n

        \n
      1. IS<\/strong>: Identifies the bolt type, namely the Hexagon Socket Head Cap Screw.<\/li>\n
      2. M8x35<\/strong>: Specifies the thread type and metric dimensions.<\/li>\n
      3. W3<\/strong>: Defines the material code (zinc\/nickel-plated carbon steel).<\/li>\n<\/ol>\n

        Summary Technical Table of the Main Features of the STAUFF Hexagon Socket Head Cap Screw (Type IS – Twin Series)<\/h3>\n
        \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
        Feature<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
        Product Type<\/td>\nHexagon Socket Head Cap Screw<\/td>\n<\/tr>\n
        Model \/ Type<\/td>\nIS<\/td>\n<\/tr>\n
        STAUFF Series<\/td>\nTwin Series<\/td>\n<\/tr>\n
        Reference Standard (Series)<\/td>\nDIN 3015, Part 3<\/td>\n<\/tr>\n
        Reference Standards (Screw)<\/td>\nISO 4762 or ANSI\/ASME B18.3<\/td>\n<\/tr>\n
        Installation Compatibility<\/td>\nDimensions applicable only when used with Type GD Cover Plate<\/td>\n<\/tr>\n
        Thread Types<\/td>\nISO Metric or Unified Coarse (UNC)<\/td>\n<\/tr>\n
        Material W3<\/td>\nZinc\/nickel-plated carbon steel<\/td>\n<\/tr>\n
        Material W4<\/td>\nV2A Stainless Steel – 1.4301 \/ 1.4305 (AISI 304 \/ 303)<\/td>\n<\/tr>\n
        Material W5<\/td>\nV4A Stainless Steel – 1.4401 \/ 1.4571 (AISI 316 \/ 316 Ti)<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n

        Product Codes<\/h3>\n
        \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
        STAUFF Group<\/th>\nDIN Group<\/th>\nThread (G x L)<\/th>\nOrder Code (Standard W3 Option)<\/th>\n<\/tr>\n<\/thead>\n
        1D<\/td>\n1<\/td>\nM6 x 35<\/td>\nIS-M6x35-W3<\/td>\n<\/tr>\n
        1D<\/td>\n1<\/td>\n1\/4-20 UNC x 1-3\/8<\/td>\nIS1-\/4-20UNCx1-3\/8-W3<\/td>\n<\/tr>\n
        2D<\/td>\n2<\/td>\nM8 x 35<\/td>\nIS-M8x35-W3<\/td>\n<\/tr>\n
        2D<\/td>\n2<\/td>\n5\/16-18 UNC x 1-3\/8<\/td>\nIS-516-18UNCx1-3\/\/8-W3<\/td>\n<\/tr>\n
        3D<\/td>\n3<\/td>\nM8 x 45<\/td>\nIS-M8x45-W3<\/td>\n<\/tr>\n
        3D<\/td>\n3<\/td>\n5\/16-18 UNC x 1-3\/4<\/td>\nIS-516-18UNCx1-3\/\/4-W3<\/td>\n<\/tr>\n
        4D<\/td>\n4<\/td>\nM8 x 50<\/td>\nIS-M8x50-W3<\/td>\n<\/tr>\n
        4D<\/td>\n4<\/td>\n5\/16-18 UNC x 2<\/td>\nIS-516-18UNCx2\/-W3<\/td>\n<\/tr>\n
        5D<\/td>\n5<\/td>\nM8 x 60<\/td>\nIS-M8x60-W3<\/td>\n<\/tr>\n
        5D<\/td>\n5<\/td>\n5\/16-18 UNC x 2-1\/2<\/td>\nIS-516-18UNCx2-1\/\/2-W3<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n","protected":false},"excerpt":{"rendered":"

        The STAUFF Hexagon Socket Head Cap Screw (Type IS – Twin Series) is designed for installation in accordance with DIN 3015, Part 3. Compatible with Type GD cover plates, it is available with ISO metric or UNC threads in compliance with ANSI\/ASME B18.3 \/ ISO 4762. Manufactured from zinc\/nickel-plated carbon steel (W3), V2A stainless steel (W4) or V4A stainless steel (W5), it ensures high mechanical strength in hydraulic systems. The dimensions are suitable for STAUFF size Groups 1D to 5D.
        The available product codes (standard W3 option) are: IS-M6x35-W3, IS1-\/4-20UNCx1-3\/8-W3, IS-M8x35-W3, IS-516-18UNCx1-3\/\/8-W3, IS-M8x45-W3, IS-516-18UNCx1-3\/\/4-W3, IS-M8x50-W3, IS-516-18UNCx2\/-W3, IS-M8x60-W3, IS-516-18UNCx2-1\/\/2-W3.<\/p>\n","protected":false},"featured_media":12881,"template":"","meta":{"_joinchat":[]},"product_brand":[],"product_cat":[101,470],"product_tag":[281],"class_list":{"0":"post-13304","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":"\nSTAUFF Hexagon Socket Head Cap Screw (Type IS - Twin Series) \u2013 LubeTeam Hydraulic<\/title>\n<meta name=\"description\" content=\"Discover the STAUFF Hexagon Socket Head Cap Screw (Type IS - Twin Series), compliant with DIN 3015. 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