S-91251A323 1"-14 x 5" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi provides superior load-bearing capacity for demanding applications, reducing the risk of fastener failure.
• Precise Class 3A thread fit ensures tighter tolerances and more reliable engagement in tapped holes, minimizing backlash and improving assembly integrity.
• Black-oxide finish on alloy steel offers enhanced corrosion resistance for extended service life in harsh industrial environments.
• Rockwell C37 hardness delivers excellent wear resistance and durability, maintaining performance under high-stress conditions.
• 3/4" hex drive and standard socket head allow for high-torque installation with common tools, streamlining assembly and maintenance processes.
• Partially threaded design provides an unthreaded shoulder for precise clamping and alignment in assemblies.
• Compliance with RoHS 3 and REACH ensures environmental responsibility and global regulatory acceptance for your supply chain.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to solve critical challenges in heavy machinery, automotive, and precision equipment manufacturing. The 1"-14 UNRF fine thread and Class 3A fit provide superior vibration resistance and clamping force in high-stress joints, preventing loosening in dynamic applications. The alloy steel construction with a Rockwell C37 hardness rating ensures the fastener can withstand extreme operational stresses without deforming, making it ideal for structural frames, hydraulic systems, and powertrain assemblies. The 3/4" hex drive facilitates efficient installation in confined spaces, reducing assembly time while the black-oxide surface treatment adds a protective layer against rust and wear, extending maintenance intervals and improving overall equipment reliability.

Specification Summary & Compliance

This socket head cap screw features a 1"-14 UNRF fine thread with a Class 3A tolerance for precision fit, a minimum thread length of 2 1/2", and a total length of 5". It is manufactured in compliance with ASTM A574 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring suitability for regulated industrial and international markets.