S-91770A625 1/4"-28 x 1/2" ASME B18.6.3 Stainless Steel Truss Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from passivated 18-8 stainless steel construction, ideal for harsh industrial environments
• Exceptional tensile strength of 70,000 psi ensures reliable, long-lasting fastening under high-stress conditions
• Wide truss head design provides enhanced load distribution and prevents surface damage during installation
• Precision Class 2A thread fit guarantees consistent engagement and vibration resistance in critical assemblies
• Full threading along the 1/2" length offers maximum grip and adjustment flexibility in various material thicknesses
• Phillips No. 3 drive compatibility enables efficient installation with standard industrial tools
• Compliance with ASME B18.6.3 and environmental regulations ensures quality assurance and safe usage across global markets

Professional Applications & Engineering Value

These 1/4-28 UNF rounded truss head screws deliver critical performance advantages in demanding applications where corrosion resistance and structural integrity are paramount. The passivated 18-8 stainless steel construction effectively combats chemical exposure and moisture, making these industrial screws ideal for marine equipment, food processing machinery, and outdoor structures. The combination of fine UNF threading and Class 2A fit provides superior vibration resistance in dynamic assemblies, while the wide truss head distributes clamping force evenly to prevent material deformation. Engineered to meet ASME B18.6.3 specifications, these fully threaded screws ensure consistent performance in high-precision manufacturing and maintenance operations where fastener failure is not an option.

Specification Summary & Compliance

This rounded truss head screw features precision 1/4"-28 UNF fine threads with Class 2A fit tolerance for consistent engagement. Manufacturing complies with ASME B18.6.3 standards for dimensional accuracy and performance. The product is RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting current environmental regulations for hazardous substances. With Rockwell B70 hardness and 70,000 psi tensile strength, these screws deliver reliable mechanical performance across industrial applications.