S-91773A572 1/4"-20 x 4" ASME B18.6.3 Stainless Steel Round Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for extended service life in harsh environments
• High tensile strength of 100,000 psi ensures reliable performance under heavy loads and vibration
• Precise Class 2A thread fit provides consistent engagement and reduces cross-threading risks during assembly
• Optimized drive engagement with Phillips No. 3 drive for efficient installation and reduced cam-out
• Versatile partial threading allows for both secure fastening and adjustable positioning in assemblies
• Rounded head design offers a finished appearance while minimizing snagging hazards
• Full regulatory compliance with ASME B18.6.3, RoHS 3, and REACH ensures material safety and quality consistency

Professional Applications & Engineering Value

These 1/4"-20 UNC coarse thread screws deliver exceptional engineering value for industrial applications where corrosion resistance and mechanical strength are critical. The 18-8 stainless steel composition combined with passivated finish provides superior protection against chemical exposure and atmospheric corrosion, making these rounded head screws ideal for manufacturing equipment, marine components, and food processing machinery. The partially threaded design allows for both secure clamping and precise adjustment capabilities, while the Phillips No. 3 drive ensures efficient installation in high-volume production environments. With 100,000 psi tensile strength and Rockwell B100 hardness, these fasteners maintain structural integrity under dynamic loads and vibration, reducing maintenance frequency and downtime in demanding applications.

Specification Summary & Compliance

This 1/4"-20 x 4" rounded head Phillips screw features UNC coarse threading with Class 2A thread fit tolerance for precise engagement. Manufacturing conforms to ASME B18.6.3 specifications for dimensional accuracy and performance. The product is fully compliant with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety, ensuring environmental responsibility and workplace safety standards are met.