S-90008A451 4-40 x 5/8" ASME B18.3, ASTM F837 18-8 Stainless Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with silver-plated 18-8 stainless steel construction, ideal for harsh environments and extended service life.
• Superior mechanical strength offering 70,000 psi tensile strength and Rockwell B70 hardness for reliable performance under high stress.
• Precise thread engagement with Class 3A thread fit and UNC coarse threads, ensuring secure fastening and vibration resistance.
• Optimized for high-torque applications featuring a standard hex socket head and 3/32" drive for easy installation with common tools.
• Full thread coverage along the 5/8" length provides maximum grip and uniform clamping force across the entire fastener.
• Compliance with major industry standards including ASME B18.3 and ASTM F837, guaranteeing consistent quality and interchangeability.
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements for hazardous substances.

Professional Applications & Engineering Value

These silver-plated 18-8 stainless steel socket head cap screws are engineered to address critical challenges in precision assemblies where corrosion resistance, high tensile strength, and reliable performance are non-negotiable. The 4-40 UNC coarse thread design, combined with a Class 3A thread fit, ensures minimal backlash and superior vibration resistance in dynamic applications such as aerospace components, medical devices, and electronic enclosures. The hex drive and standard socket head profile allow for high torque application without stripping, making them ideal for confined spaces. The silver plating not only enhances corrosion protection but also provides a conductive surface, beneficial in electrical grounding applications. This fastener is a trusted solution for industries demanding durability, precision, and regulatory compliance.

Specification Summary & Compliance

This product adheres to Class 3A thread fit tolerances for precision, with UNC coarse threads (4-40 size) and a fully threaded 5/8" length. Manufacturing and quality are governed by ASME B18.3 and ASTM F837 specifications. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from restricted hazardous substances and safe for use in various international markets.