S-91251A608 1 1/2"-12 x 4" 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, reducing the risk of fastener failure.
• Black-oxide coating on alloy steel provides enhanced corrosion resistance, extending service life in demanding industrial environments.
• Fine UNRF threading with Class 2A fit offers precise engagement and vibration resistance, maintaining secure connections in critical assemblies.
• Hex socket drive design allows for high-torque installation and easy access in confined spaces, improving assembly efficiency.
• Full threading along the 4" length enables adjustable positioning and uniform load distribution, accommodating various material thicknesses.
• Rockwell C37 hardness ensures durability and wear resistance, minimizing deformation during repeated use.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety, meeting global regulatory standards.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges such as joint loosening due to vibration and corrosion-induced degradation. The UNRF fine thread with Class 2A fit ensures tight, precise fastening in machinery, automotive, and heavy equipment applications, where alignment and stability are critical. The high tensile strength and Rockwell C37 hardness provide resilience under dynamic loads, reducing maintenance needs. Its hex drive and fully threaded design facilitate quick installation and adaptability in complex assemblies, making it ideal for industrial screws requiring both strength and corrosion resistance from the black-oxide surface treatment.

Specification Summary & Compliance

This screw adheres to Class 2A thread fit for consistent dimensional accuracy and features UNRF fine threading with a 1 1/2"-12 size. Manufactured to ASTM A574 specifications, it ensures material integrity and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental responsibility for industrial use.