S-90044A139 5/16"-18 x 2" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Superior tensile strength with 170,000 psi rating ensures reliable performance under extreme loads
• Precision Class 3A thread fit provides excellent engagement and vibration resistance in demanding applications
• Black-oxide surface treatment on alloy steel offers enhanced corrosion resistance for extended service life
• Standard hex socket drive allows for high-torque installation with 1/4" hex key compatibility
• Fully threaded design enables maximum grip length and uniform load distribution
• Rockwell C37 hardness maintains dimensional stability and prevents thread deformation
• Coarse UNRC thread pattern facilitates quick assembly and disassembly in industrial settings

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw delivers exceptional engineering value in high-stress applications where reliability is paramount. The combination of 170,000 psi tensile strength and Rockwell C37 hardness ensures the fastener maintains integrity under sustained vibration and heavy loads, making it ideal for machinery, automotive assemblies, and heavy equipment. The Class 3A thread fit provides precise engagement that minimizes backlash in precision equipment, while the coarse UNRC thread form allows for rapid installation in production environments. The black-oxide coating extends service life in moderately corrosive conditions, and the fully threaded design offers versatile clamping solutions across various material thicknesses.

Specification Summary & Compliance

This 5/16"-18 x 2" socket head cap screw features Class 3A thread fit with UNRC coarse threads and right-hand thread direction. Manufactured to ASTM A574 specifications with a head diameter of 15/32" and head height of 5/16". The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across industrial applications.