S-90117A583 5/16"-18 x 1" ASME B18.3 Alloy Steel Wire-Lockable Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide finish, ideal for harsh industrial environments.
• Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress conditions.
• Precise Class 3A thread fit provides secure, vibration-resistant fastening in critical assemblies.
• Rockwell C37 hardness offers excellent wear resistance and long-term durability.
• 1/4" hex drive and standard socket head profile allow for easy installation with common tools.
• Fully threaded design with 5/16"-18 UNC coarse threads enables quick assembly and strong holding power.
• Compliance with ASME B18.3, RoHS 3, and REACH ensures quality, safety, and environmental standards are met.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address common industrial challenges such as vibration loosening and corrosion in demanding applications. Its 5/16"-18 UNC coarse threads and Class 3A fit provide superior grip and alignment in machinery, automotive, and heavy equipment assemblies. The black-oxide surface treatment enhances durability against moisture and chemicals, while the fully threaded design ensures consistent clamping force. Ideal for use in industrial socket screw applications, it combines high tensile strength and Rockwell C37 hardness to prevent stripping and fatigue, reducing maintenance needs and downtime in right-hand thread systems.

Specification Summary & Compliance

This screw features precise Class 3A thread fit per UNC standards, with dimensions including 1" length and 1/4" hex drive. It meets ASME B18.3 specifications for socket head cap screws, ensuring dimensional accuracy and performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, it supports sustainable and safe industrial practices without hazardous substances.