S-90008A441 4-40 x 1/2" ASME B18.3, ASTM F837 18-8 Stainless Steel Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with silver-plated 18-8 stainless steel construction for extended service life in harsh environments
• Exceptional tensile strength rated at 70,000 psi ensures reliable performance under high-stress conditions
• Precision Class 3A thread fit guarantees secure fastening with minimal backlash in critical assemblies
• Hex socket drive design provides superior torque transmission and prevents stripping during installation
• Full thread coverage along the entire 1/2" length enables maximum engagement and load distribution
• Rockwell B70 hardness maintains dimensional stability and thread integrity through repeated use
• Comprehensive regulatory compliance meets ASME, ASTM, RoHS 3, and REACH standards for global industrial applications

Professional Applications & Engineering Value

These silver plated 18-8 stainless steel socket head cap screws deliver critical performance advantages in demanding industrial environments. The 4-40 UNC coarse thread configuration with Class 3A fit provides exceptional vibration resistance while facilitating rapid assembly in high-volume production settings. The combination of 70,000 psi tensile strength and Rockwell B70 hardness ensures reliable performance in applications subject to mechanical stress and thermal cycling. The hex socket drive design prevents cam-out during torque application, making them ideal for precision equipment, aerospace components, and medical devices where fastener integrity is paramount. The silver plating enhances both corrosion protection and electrical conductivity, while the fully threaded design maximizes clamping force distribution across the entire engagement length.

Specification Summary & Compliance

Manufactured to exacting ASME B18.3 specifications and ASTM F837 standards, these socket head cap screws feature precision 4-40 UNC coarse threads with Class 3A fit tolerances for superior thread engagement. The 1/2" length maintains dimensional consistency across production lots, while the 3/32" hex drive ensures compatibility with standard industrial tools. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations guarantees environmental safety and material traceability for global supply chain integration.