S-91251A604 1 1/4"-12 x 6" 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 from the black-oxide finish prolongs service life in harsh industrial environments, minimizing maintenance and replacement costs.
• Precise Class 2A thread fit with UNRF fine threads provides secure, vibration-resistant connections, enhancing assembly integrity and safety.
• High hardness rating (Rockwell C37) offers excellent wear resistance, maintaining dimensional stability and thread integrity over repeated use.
• Partially threaded design allows for optimal grip and clamping force control, ideal for applications requiring precise joint compression.
• Standard hex drive compatibility with 7/8" drive size enables easy installation and removal using common tools, improving workflow efficiency.
• Compliance with ASTM A574 and environmental regulations (RoHS 3, REACH) ensures material consistency and safe use across global industrial sectors.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this Black-Oxide Alloy Steel Socket Head Cap Screw addresses common challenges in machinery, automotive, and construction sectors where high tensile strength and durability are paramount. The UNRF fine thread configuration delivers superior resistance to loosening under dynamic loads and vibrations, while the partially threaded rod design ensures accurate clamping without compromising structural integrity. The black-oxide surface treatment provides an added layer of protection against rust and corrosion, making it suitable for outdoor or chemically aggressive environments. With a 1 1/4"-12 thread size and 6" length, it offers versatile fastening solutions for robust assemblies requiring precise torque and long-term reliability.

Specification Summary & Compliance

This socket head cap screw features a Class 2A thread fit with UNRF fine thread spacing, ensuring dimensional accuracy per industry standards. It meets ASTM A574 specifications for alloy steel socket head cap screws, guaranteeing material and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in regulated markets without hazardous substances.