S-91251A611 1 1/2"-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 loads, reducing the risk of fastener failure in critical applications.
• Superior corrosion resistance provided by the black-oxide finish on alloy steel, extending service life in demanding industrial environments.
• Precise fine threading (1 1/2"-12 UNRF) offers improved vibration resistance and superior clamping force compared to coarse threads.
• High hardness (Rockwell C37) enhances wear resistance and durability, maintaining thread integrity through repeated use.
• 1" hex drive design allows for high torque application and secure installation in confined spaces using standard tools.
• Partially threaded configuration provides optimal grip and alignment while minimizing thread damage during assembly.
• Comprehensive compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental responsibility.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw delivers exceptional engineering value in heavy machinery, automotive, and construction applications where high tensile strength and corrosion resistance are critical. The 1 1/2"-12 UNRF fine thread configuration provides superior vibration resistance in dynamic load conditions, while the socket head design enables precise installation in space-constrained environments. The Rockwell C37 hardness ensures maintained performance in high-wear scenarios, and the black-oxide surface treatment offers reliable protection against environmental degradation. These features combine to solve common industrial challenges of fastener loosening, corrosion-induced failure, and installation accessibility in critical assembly operations.

Specification Summary & Compliance

This socket head cap screw maintains Class 2A thread fit tolerance for consistent engagement and features 1 1/2"-12 UNRF fine threads with a minimum thread length of 3 3/4". Manufactured to ASTM A574 specification for high-strength alloy steel socket head cap screws, the product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting the latest environmental regulations for industrial fasteners.