S-91770A581 5/16"-18 x 3/4" ASME B18.6.3 Stainless Steel Truss Head Phillips Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with passivated 18-8 stainless steel construction for long-term reliability in harsh environments
• Superior load distribution thanks to the wide truss head design that prevents pull-through and reduces surface damage
• High tensile strength of 70,000 psi ensures reliable performance under heavy loads and vibration
• Easy installation and removal with Phillips No. 4 drive that provides secure tool engagement
• Optimal thread engagement through fully threaded UNC coarse spacing for faster assembly and stronger holding power
• Precision thread fit (Class 2A) guarantees consistent performance and reduces the risk of cross-threading
• Full regulatory compliance with ASME B18.6.3, RoHS 3, and REACH standards for worry-free industrial use

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these passivated 18-8 stainless steel rounded truss head screws deliver exceptional performance where corrosion resistance and structural integrity are paramount. The wide truss head design provides superior bearing surface distribution, making them ideal for sheet metal assemblies, electrical enclosures, and machinery where material pull-through must be prevented. The combination of UNC coarse threading and full threading ensures rapid installation and maximum thread engagement in various substrates, while the Rockwell B70 hardness maintains thread integrity during repeated installations. These Phillips drive screws are particularly valuable in maintenance operations and production lines where consistent, reliable fastening is essential for operational continuity and safety compliance.

Specification Summary & Compliance

This 5/16"-18 x 3/4" screw features precision UNC coarse thread spacing with Class 2A thread fit tolerance for consistent performance. Manufactured to ASME B18.6.3 specifications with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The passivated 18-8 stainless steel construction meets 70,000 psi tensile strength requirements with Rockwell B70 hardness for durable, reliable fastening in industrial applications.