S-91251A883 7/8"-9 x 2 3/4" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress industrial applications
• Superior corrosion resistance from black-oxide coating extends service life in demanding environments
• Precise Class 3A thread fit provides excellent engagement and vibration resistance in critical assemblies
• Heavy-duty alloy steel construction with Rockwell C37 hardness maintains structural integrity under extreme loads
• Standard hex socket drive (3/4") allows for high-torque installation in confined spaces
• Fully threaded design offers maximum grip length and uniform load distribution
• Compliance with ASTM A574 guarantees consistent quality and mechanical properties

Professional Applications & Engineering Value

These black-oxide alloy steel socket head cap screws deliver critical engineering solutions where high tensile strength and corrosion resistance are paramount. The UNRC coarse thread configuration with Class 3A fit ensures rapid assembly and superior vibration resistance in heavy machinery, industrial equipment, and structural applications. The fully threaded design provides maximum engagement depth while the standard socket head profile with 3/4" hex drive enables high-torque installation in space-constrained environments. Engineered to withstand extreme mechanical stresses, these industrial fasteners prevent joint failure in critical applications requiring 170,000 psi tensile strength and Rockwell C37 hardness.

Specification Summary & Compliance

Manufactured to ASTM A574 specifications with Class 3A thread fit precision and UNRC coarse thread standards. Features include 7/8"-9 thread size, 2 3/4" length, and fully threaded configuration. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.