S-91770A667 1/4"-28 x 1" 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 construction for long-lasting performance in harsh environments
• Enhanced load distribution through the wide truss head design, reducing surface pressure and preventing material damage
• High tensile strength of 70,000 PSI ensures reliable fastening under significant mechanical stress and vibration
• Precision Class 2A thread fit guarantees consistent engagement and secure assembly in fine-thread applications
• Optimized Phillips No. 3 drive provides efficient installation with reduced cam-out risk for improved workflow
• Full threading along the 1" length offers maximum grip and adjustment flexibility in various material thicknesses
• Compliance with ASME B18.6.3, RoHS 3, and REACH ensures adherence to industry standards and environmental safety regulations

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these 1/4-28 UNF rounded truss head screws address critical challenges in assembly and maintenance. The passivated 18-8 stainless steel provides excellent resistance to oxidation and chemical exposure, making them ideal for applications in marine, food processing, and outdoor equipment where moisture and contaminants are prevalent. The wide truss head design significantly increases bearing surface, distributing clamp load effectively to prevent surface damage on softer materials or finished panels. Combined with UNF fine threading and Class 2A fit, these screws maintain secure fastening in high-vibration machinery, electronic enclosures, and precision instruments, reducing the risk of loosening over time. The fully threaded configuration ensures consistent holding power across varying material depths, streamlining inventory for manufacturers and maintenance teams.

Specification Summary & Compliance

This screw maintains precise Class 2A thread fit per UNF standards, ensuring dimensional accuracy and reliable performance. Manufacturing follows ASME B18.6.3 specifications for consistency and quality. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances and supporting environmentally responsible procurement.