S-91251A996 1 1/4"-7 x 16" 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 demanding applications.
• Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life and maintaining integrity in harsh industrial environments.
• Precise Class 2A thread fit provides smooth assembly and secure fastening, minimizing cross-threading and improving installation efficiency.
• Robust 7/8" hex drive design allows for high-torque application with standard tools, ensuring tight, vibration-resistant connections.
• Partially threaded shank offers optimal grip and clamping force control, ideal for applications requiring precise joint compression.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material consistency, environmental safety, and regulatory acceptance for global projects.
• Coarse UNC threads enable quick installation and superior resistance to loosening in high-vibration settings.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this black-oxide alloy steel socket head cap screw addresses critical challenges in machinery assembly, structural frameworks, and equipment manufacturing. The 1 1/4"-7 UNC coarse thread with Class 2A fit ensures rapid, reliable fastening even in high-vibration environments, reducing downtime. The partially threaded design concentrates clamping force precisely, preventing joint slippage in dynamic loads. With a Rockwell C37 hardness and 170,000 psi tensile strength, it withstands severe mechanical stress, while the black-oxide surface treatment resists corrosion, extending component life in outdoor or chemically exposed settings. Ideal for construction, automotive, and heavy equipment sectors, it delivers durability and compliance with ASTM A574 standards.

Specification Summary & Compliance

This socket head cap screw features a 1 1/4"-7 UNC coarse thread with Class 2A thread fit for precise dimensional accuracy and easy assembly. Manufactured to ASTM A574 specifications, it ensures consistent quality and performance. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, adhering to environmental and safety regulations for hazardous substances. With a length of 16" and partial threading, it meets inch-system requirements, providing reliable fastening solutions for industrial use.