S-91772A534 1/4"-20 x 5/16" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction for extended service life in harsh environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for reliable load-bearing performance
• Optimized installation efficiency through No. 3 Phillips drive and standard pan head design for secure, slip-resistant fastening
• Precision thread engagement with Class 2A UNC coarse threads ensuring consistent fit and vibration resistance
• Full-threaded design providing maximum grip length and uniform stress distribution across connected materials
• Regulatory compliance assurance meeting ASME B18.6.3 specifications for dimensional accuracy and performance reliability
• Environmental responsibility with RoHS 3 and REACH compliance for safe use in regulated industries

Professional Applications & Engineering Value

This 1/4"-20 UNC fully threaded screw delivers critical performance advantages in demanding industrial environments where corrosion resistance and mechanical reliability are paramount. The passivated 18-8 stainless steel construction provides exceptional protection against oxidation and chemical degradation, making it ideal for applications in marine equipment, food processing machinery, and outdoor structures. The combination of coarse UNC threading with Class 2A fit ensures rapid assembly and secure fastening in materials where fine threads might strip or fail. The standard pan head with Phillips drive offers superior torque transmission during installation, reducing cam-out incidents while maintaining flush mounting capabilities. These engineering features collectively address common industrial challenges including vibration-induced loosening, environmental degradation, and installation efficiency in high-volume manufacturing operations.

Specification Summary & Compliance

This fastener maintains precise Class 2A thread fit tolerances according to UNC coarse thread standards, with dimensional compliance to ASME B18.6.3 specifications. The manufacturing process adheres to strict quality controls ensuring consistent 0.25" thread diameter and 5/16" length accuracy. Regulatory compliance includes full conformance with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) chemical safety standards, validated through current compliance documentation.