S-91770A580 5/16"-18 x 5/8" ASME B18.6.3 Stainless Steel Truss Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel, ideal for harsh environments and long-term reliability.
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B70 hardness for heavy-duty applications.
• Wide truss head design provides a larger bearing surface, reducing the risk of surface damage and improving load distribution.
• Easy installation and removal with No. 4 Phillips drive, ensuring secure torque transmission and reduced cam-out.
• Reliable thread engagement through UNC coarse threading and Class 2A fit, minimizing cross-threading and ensuring consistent fastening.
• Full threading along the entire length allows for maximum grip and adjustability in various material thicknesses.
• Compliance with industry standards including ASME B18.6.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, this 5/16"-18 x 5/8" passivated 18-8 stainless steel truss head screw addresses critical challenges such as corrosion, vibration loosening, and high-stress fatigue. The passivated surface treatment enhances the inherent corrosion resistance of stainless steel, making it suitable for outdoor, marine, and chemical exposure applications. Its UNC coarse thread and Class 2A fit provide quick assembly and reliable performance in materials like metal, plastic, and wood, reducing installation time and maintenance costs. The wide truss head distributes clamping force effectively, preventing pull-through in softer substrates. Ideal for machinery, electrical enclosures, and structural assemblies, this screw ensures long-term integrity and compliance with ASME B18.6.3 specifications, offering a dependable solution for engineers and procurement specialists.

Specification Summary & Compliance

This screw features precise Class 2A thread fit and UNC coarse threading with a diameter of 0.313" and length of 5/8", ensuring dimensional accuracy per ASME B18.6.3. It is fully manufactured from 18-8 stainless steel with a passivated finish for enhanced durability. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), confirming adherence to environmental and safety regulations without restricted substances.