S-90008A721 1/4"-20 x 5/8" ASME B18.3, ASTM F837 18-8 Stainless Steel Socket Head Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance through silver plating on 18-8 stainless steel, ideal for harsh environments and extended service life
• Superior tensile strength of 70,000 psi ensures reliable performance under high-stress applications without failure
• Precision Class 3A thread fit provides tighter tolerances for secure, vibration-resistant fastening in critical assemblies
• Hex socket drive design allows for high torque application and easy installation in confined spaces with standard tools
• Coarse UNC threading enables quick assembly and disassembly, reducing installation time in industrial settings
• Full thread coverage along the 5/8" length ensures maximum grip and uniform load distribution
• Compliance with major standards including ASME B18.3 and ASTM F837 guarantees consistent quality and interchangeability

Professional Applications & Engineering Value

Engineered for demanding environments, this silver plated 18-8 stainless steel socket head cap screw combines material excellence with precision manufacturing to address common industrial challenges. The UNC coarse thread with Class 3A fit ensures minimal backlash and superior resistance to loosening under vibration, making it ideal for machinery, automotive, and aerospace applications where reliability is critical. The hex drive socket head provides excellent torque transmission, enabling secure fastening in tight spaces without stripping. Silver plating enhances the natural corrosion resistance of stainless steel, protecting against oxidation and chemical exposure in outdoor or marine settings. With a Rockwell B70 hardness and high tensile strength, it maintains integrity under heavy loads, reducing maintenance needs and downtime in continuous operation systems.

Specification Summary & Compliance

This socket head cap screw features a 1/4"-20 UNC coarse thread with Class 3A precision fit, ensuring tight dimensional accuracy as per ASME B18.3 and ASTM F837 specifications. The manufacturing process adheres to strict quality controls, with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances. The screw is fully threaded, right-hand direction, with a standard socket head profile and 3/16" hex drive size, designed for consistent performance in industrial fastening applications.