{"id":3167,"date":"2025-06-17T13:25:08","date_gmt":"2025-06-17T05:25:08","guid":{"rendered":"https:\/\/machinedwasher.com\/?post_type=product&p=3167"},"modified":"2025-06-17T13:31:41","modified_gmt":"2025-06-17T05:31:41","slug":"shoulder-screws","status":"publish","type":"product","link":"https:\/\/machinedwasher.com\/el\/products\/shoulder-screws\/","title":{"rendered":"Shoulder Screws 316 Stainless Steel Socket Head Shoulder Screws"},"content":{"rendered":"

What Are Shoulder Screws?<\/strong><\/h2>\n

Shoulder screws, also known as shoulder bolts or stripper bolts, are specialized fasteners with a cylindrical shoulder (unthreaded section) between the head and the threaded portion. This shoulder provides precise alignment, smooth rotation, or spacing in mechanical assemblies. They are commonly used in machinery, automotive systems, and industrial equipment where precise positioning is required.<\/p>\n

\n

Specifications of Shoulder Screws<\/strong><\/h2>\n

1. Materials<\/strong><\/h3>\n
    \n
  • \n

    Stainless Steel (SS304, SS316)<\/strong>\u00a0\u2013 Corrosion-resistant, ideal for food, medical, and marine applications.<\/p>\n<\/li>\n

  • \n

    Alloy Steel (AISI 4140, 4340)<\/strong>\u00a0\u2013 High strength, often heat-treated for durability.<\/p>\n<\/li>\n

  • \n

    Carbon Steel (Grade 5, Grade 8)<\/strong>\u00a0\u2013 Common for industrial uses, usually zinc-plated or coated.<\/p>\n<\/li>\n

  • \n

    Brass<\/strong>\u00a0\u2013 Used in electrical and low-friction applications.<\/p>\n<\/li>\n

  • \n

    Titanium<\/strong>\u00a0\u2013 Lightweight and strong, suitable for aerospace and high-performance uses.<\/p>\n<\/li>\n<\/ul>\n

    2. Surface Treatments<\/strong><\/h3>\n
      \n
    • \n

      Zinc Plating<\/strong>\u00a0\u2013 Improves corrosion resistance.<\/p>\n<\/li>\n

    • \n

      Black Oxide<\/strong>\u00a0\u2013 Enhances wear resistance and reduces glare.<\/p>\n<\/li>\n

    • \n

      Nickel Plating<\/strong>\u00a0\u2013 Provides a smooth, corrosion-resistant finish.<\/p>\n<\/li>\n

    • \n

      Anodizing (for aluminum shoulder screws)<\/strong>\u00a0\u2013 Improves hardness and aesthetics.<\/p>\n<\/li>\n

    • \n

      PTFE (Teflon) Coating<\/strong>\u00a0\u2013 Reduces friction and prevents galling.<\/p>\n<\/li>\n<\/ul>\n

      3. Common Sizes & Standards<\/strong><\/h3>\n
        \n
      • \n

        Diameter (Shoulder):<\/strong>\u00a01\/8″ to 2″ (or metric equivalents like M3 to M50).<\/p>\n<\/li>\n

      • \n

        Length:<\/strong>\u00a0Varies based on application (e.g., 5mm to 300mm shoulder length).<\/p>\n<\/li>\n

      • \n

        Thread Types:<\/strong>\u00a0UNC, UNF, Metric coarse\/fine.<\/p>\n<\/li>\n

      • \n

        Standards:<\/strong>\u00a0DIN 653, ISO 7379, ASME B18.3.<\/p>\n<\/li>\n<\/ul>\n

        \n

        Applications<\/strong><\/h2>\n
          \n
        • \n

          Automotive:<\/strong>\u00a0Suspension systems, gearbox alignment.<\/p>\n<\/li>\n

        • \n

          Machinery:<\/strong>\u00a0Pivots, hinges, and rotating assemblies.<\/p>\n<\/li>\n

        • \n

          Robotics:<\/strong>\u00a0Joint connections and precision movement.<\/p>\n<\/li>\n

        • \n

          Medical Devices:<\/strong>\u00a0Surgical instruments and imaging equipment.<\/p>\n<\/li>\n

        • \n

          Aerospace:<\/strong>\u00a0Landing gear and control mechanisms.<\/p>\n<\/li>\n

        • \n

          Molds & Dies:<\/strong>\u00a0Ejection systems in injection molding.<\/p>\n<\/li>\n<\/ul>\n

          \n

          Excellent Case: Shoulder Screws in Robotic Arms<\/strong><\/h2>\n

          Challenge:<\/strong><\/h3>\n

          A robotic arm manufacturer needed a fastener that could ensure smooth rotation at pivot joints while maintaining precise alignment under high cyclic loads.<\/p>\n

          Solution:<\/strong><\/h3>\n

          They used\u00a0stainless steel (SS316) shoulder screws<\/strong>\u00a0with a\u00a0PTFE coating<\/strong>\u00a0to reduce friction and prevent corrosion. The unthreaded shoulder provided a perfect bearing surface for the robotic arm\u2019s bushings, ensuring smooth movement without play.<\/p>\n

          Result:<\/strong><\/h3>\n
            \n
          • \n

            Increased joint lifespan by\u00a040%<\/strong>\u00a0due to reduced wear.<\/p>\n<\/li>\n

          • \n

            Improved precision in robotic movements, enhancing assembly line efficiency.<\/p>\n<\/li>\n

          • \n

            Minimal maintenance required, even in high-humidity environments.<\/p>\n<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

            Shoulder Screws 316 Stainless Steel Socket Head Shoulder Screws<\/p>","protected":false},"featured_media":3172,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[],"product_cat":[35],"product_tag":[185,186,183,184,876,875,879,872,871,877,878,873,846,874],"class_list":{"0":"post-3167","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-machined-screws","7":"product_tag-cnc-machined-screw","8":"product_tag-cnc-machined-screws","9":"product_tag-cnc-machining-screw","10":"product_tag-cnc-machining-screws","11":"product_tag-custom-shoulder-screws","12":"product_tag-hex-head-shoulder-screws","13":"product_tag-shoulder-bolt-screws","14":"product_tag-shoulder-screw","15":"product_tag-shoulder-screws","16":"product_tag-shoulder-screws-fastenal","17":"product_tag-shoulder-screws-m4","18":"product_tag-socket-head-shoulder-screws","19":"product_tag-stainless-steel-screws","20":"product_tag-stainless-steel-shoulder-screws","22":"first","23":"instock","24":"shipping-taxable","25":"product-type-simple"},"acf":[],"_links":{"self":[{"href":"https:\/\/machinedwasher.com\/el\/wp-json\/wp\/v2\/product\/3167","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/machinedwasher.com\/el\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/machinedwasher.com\/el\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/machinedwasher.com\/el\/wp-json\/wp\/v2\/comments?post=3167"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/machinedwasher.com\/el\/wp-json\/wp\/v2\/media\/3172"}],"wp:attachment":[{"href":"https:\/\/machinedwasher.com\/el\/wp-json\/wp\/v2\/media?parent=3167"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/machinedwasher.com\/el\/wp-json\/wp\/v2\/product_brand?post=3167"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/machinedwasher.com\/el\/wp-json\/wp\/v2\/product_cat?post=3167"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/machinedwasher.com\/el\/wp-json\/wp\/v2\/product_tag?post=3167"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}