S-91251A427 1 1/4"-12 x 7" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under extreme mechanical loads, reducing the risk of fastener failure in demanding applications.
• Black-oxide coating on alloy steel provides enhanced corrosion resistance and a durable, non-reflective finish suitable for harsh industrial environments.
• Class 2A thread fit with UNF fine threads offers precise engagement and vibration resistance, maintaining secure connections in high-stress assemblies.
• 7/8" hex drive and standard socket head profile allow for easy installation and high torque application with common tools, minimizing assembly time.
• Partially threaded design with 3 1/8" minimum thread length provides flexibility for applications requiring both clamped and unthreaded sections.
• Rockwell C37 hardness rating delivers superior wear resistance and longevity, extending service life in repetitive or abrasive conditions.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees adherence to international quality and environmental standards, ensuring safe and reliable use.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address critical challenges in heavy machinery, automotive, and construction sectors where high tensile strength and vibration resistance are paramount. The UNF fine thread spacing and Class 2A thread fit ensure tight, secure fastening that withstands dynamic loads and thermal cycling, reducing maintenance needs. The black-oxide surface treatment not only resists corrosion but also minimizes galling during installation, making it ideal for assembly lines and outdoor equipment. With a 7/8" hex drive, it enables efficient torque transfer in confined spaces, enhancing productivity while meeting ASTM A574 specifications for consistent performance in industrial fastening systems.

Specification Summary & Compliance

This socket head cap screw features a 1 1/4"-12 UNF thread size with Class 2A thread fit for precise dimensional accuracy and fine thread spacing. It is manufactured in accordance with ASTM A574 standards, ensuring high-quality alloy steel construction. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety requirements for industrial use.