S-91251A058 1 1/2"-6 x 9" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 170,000 psi tensile strength for reliable performance in high-stress applications
• Superior corrosion resistance provided by the black-oxide finish, extending service life in demanding industrial environments
• Precise torque transmission enabled by the 1" hex drive and standard socket head profile for secure fastening operations
• Optimized thread engagement through coarse UNRC threading and Class 2A fit, ensuring quick assembly and vibration resistance
• Enhanced durability from Rockwell C37 hardness, maintaining structural integrity under repeated mechanical stress
• Versatile partial threading design allowing both secure clamping and smooth adjustment in complex assemblies
• Regulatory compliance assurance meeting ASTM A574, RoHS 3, and REACH standards for global industrial applications

Professional Applications & Engineering Value

These black-oxide alloy steel socket head cap screws deliver critical engineering solutions where standard fasteners fail. The 1 1/2"-6 coarse UNRC thread configuration provides superior resistance to vibrational loosening in heavy machinery, while the partially threaded design enables precise positioning in structural frameworks and equipment mounting. The Rockwell C37 hardness rating combined with 170,000 psi tensile strength ensures reliable performance in high-load applications such as industrial presses, construction equipment, and transportation systems. The black-oxide surface treatment offers enhanced corrosion protection without compromising dimensional accuracy, making these socket head cap screws ideal for outdoor installations and harsh manufacturing environments where durability and precision are paramount.

Specification Summary & Compliance

Manufactured to exacting standards with Class 2A thread fit tolerance for consistent engagement and 1 1/2"-6 UNRC coarse thread specifications. These 9-inch socket head cap screws comply with ASTM A574 manufacturing requirements for high-strength alloy steel fasteners. Regulatory compliance includes RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) chemical safety standards, ensuring environmental responsibility and workplace safety.