S-91251A005 7/16"-20 x 2 1/2" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress conditions
• Superior corrosion resistance provided by black-oxide coating for extended service life in demanding environments
• Precision Class 3A thread fit delivers secure fastening with minimal vibration loosening
• Partially threaded design allows for optimal clamping force distribution and easier alignment
• Rockwell C37 hardness rating maintains structural integrity through repeated installation cycles
• 3/8" hex drive compatibility enables efficient installation with standard industrial tools
• Fine thread configuration provides enhanced resistance to vibration and superior holding power

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these socket head cap screws combine black-oxide alloy steel construction with UNRF fine threads to solve critical fastening challenges. The partially threaded design prevents galling in soft materials while maintaining maximum grip length. With 170,000 psi tensile strength and Rockwell C37 hardness, these fasteners withstand extreme mechanical stresses in heavy machinery, automotive assemblies, and precision equipment. The black-oxide surface treatment provides reliable corrosion protection without compromising dimensional accuracy, making them ideal for applications where both strength and environmental resistance are paramount. The 3/8" hex drive ensures secure tool engagement during high-torque installations.

Specification Summary & Compliance

Manufactured to exacting ASTM A574 specifications with Class 3A thread fit tolerance for precision assembly. Features 7/16"-20 UNRF fine threads on a partially threaded 2-1/2" length configuration. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.