S-91772A401 1/4"-20 x 7/16" ASME B18.6.3 Stainless Steel Pan 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 mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for reliable load-bearing performance
• Optimized drive engagement through Phillips No. 3 drive system, preventing cam-out during high-torque installation
• Precision thread compatibility with Class 2A UNC coarse threading ensuring secure fastening in various materials
• Full-length threading provides maximum grip length and uniform stress distribution across the entire fastener
• Standard-compliant manufacturing meeting ASME B18.6.3 specifications for consistent quality and interchangeability
• Environmental compliance with RoHS 3 and REACH regulations for safe use in regulated industries

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 1/4"-20 pan head Phillips screws deliver critical performance advantages in machinery assembly, electrical enclosures, and structural frameworks. The passivated 18-8 stainless steel construction provides exceptional resistance to oxidation and chemical exposure, significantly extending service life in corrosive environments. The UNC coarse threading with Class 2A fit ensures rapid installation and reliable engagement in both metallic and non-metallic substrates, while the fully threaded design maximizes pull-out resistance. The combination of 70,000 psi tensile strength and controlled Rockwell B70 hardness creates an optimal balance between durability and machinability, preventing thread stripping during repeated disassembly cycles common in maintenance operations.

Specification Summary & Compliance

This fastener maintains precise Class 2A thread fit tolerances with UNC coarse spacing (1/4"-20 thread size) and 7/16" length. Manufacturing strictly adheres to ASME B18.6.3 mechanical standards, ensuring dimensional consistency and mechanical performance. The product is fully compliant with RoHS 3 (2015/863/EU) restrictions on hazardous substances and meets REACH (EC 1907/2006) requirements for chemical safety, making it suitable for regulated industries including electronics, automotive, and food processing equipment.