S-91770A541 1/4"-20 x 7/8" 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 rounded truss head design that reduces surface pressure and prevents pull-through
• High tensile strength of 70,000 psi ensures reliable performance in demanding applications and heavy-duty fastening
• Easy installation and removal with Phillips No. 3 drive that provides secure tool engagement and reduces cam-out risk
• Precise thread engagement with UNC coarse threads and Class 2A fit for consistent performance and vibration resistance
• Full threading along the 7/8" length offers maximum grip and holding power throughout the entire fastener
• Comprehensive compliance with ASME B18.6.3 standards and environmental regulations for quality assurance

Professional Applications & Engineering Value

These passivated 18-8 stainless steel rounded truss head screws deliver exceptional engineering value across industrial applications where corrosion resistance and structural integrity are paramount. The combination of 70,000 psi tensile strength and Rockwell B70 hardness ensures these fasteners withstand substantial mechanical stress in construction, machinery assembly, and heavy equipment. The wide truss head profile provides superior clamping force distribution, making them ideal for sheet metal, automotive components, and electrical enclosures where surface damage must be prevented. With UNC coarse threads and full threading, installation is optimized for speed while maintaining vibration resistance in dynamic environments. The Phillips drive system ensures efficient torque transfer, reducing installation time in production lines while the passivated surface treatment extends service life in corrosive industrial settings.

Specification Summary & Compliance

These 1/4"-20 UNC coarse thread screws maintain precise Class 2A thread fit tolerances for consistent engagement and reliable performance. Manufactured to ASME B18.6.3 specifications, these fully threaded inch fasteners ensure dimensional accuracy and interchangeability. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations confirms they meet the latest restrictions on hazardous substances, making them suitable for global industrial applications with strict environmental requirements.