S-91251A870 6-32 x 1 1/8" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating for extended service life in harsh industrial environments
• Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress applications
• Precision Class 3A thread fit provides superior engagement and vibration resistance in critical assemblies
• Hex socket drive design allows for high-torque installation and removal in confined spaces
• Full threading along 1-1/8" length enables maximum adjustability and secure fastening depth
• Rockwell C37 hardness rating maintains structural integrity and prevents stripping under repeated use
• Coarse UNC thread profile facilitates quick assembly and reduces cross-threading risks

Professional Applications & Engineering Value

These black-oxide alloy steel socket head cap screws deliver critical performance advantages for demanding industrial applications. The combination of 170,000 psi tensile strength and Rockwell C37 hardness provides exceptional resistance to shear forces and fatigue in machinery, automotive, and heavy equipment assemblies. The 6-32 UNC coarse thread configuration ensures rapid installation while maintaining secure fastening in vibration-prone environments. The black-oxide surface treatment offers superior corrosion protection without compromising dimensional accuracy, making these socket head cap screws ideal for precision engineering applications where reliability and durability are paramount. The hex drive socket design enables high-torque application in space-constrained installations, solving common accessibility challenges in complex mechanical systems.

Specification Summary & Compliance

This 1-1/8" socket head cap screw features precision 6-32 UNC Class 3A threads with coarse spacing and right-hand orientation. Manufactured to ASTM A574 specifications for consistent quality and performance. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets. The fully threaded design maintains uniform mechanical properties throughout the fastener length, while the standard socket head profile with 7/64" hex drive ensures compatibility with industry-standard installation tools.