S-91251A132 1/2"-13 x 11" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
• Corrosion-resistant black-oxide coating extends service life by protecting against rust and environmental degradation in demanding conditions.
• Precise Class 3A thread fit guarantees secure, vibration-resistant connections, minimizing loosening in machinery and equipment.
• Partially threaded design allows for optimal clamping force distribution, ideal for assemblies requiring both grip and clearance.
• High Rockwell C37 hardness provides superior wear resistance, maintaining structural integrity under repeated loads.
• 3/8" hex drive compatibility enables easy installation with standard tools, streamlining maintenance and assembly processes.
• Compliance with ASTM A574 ensures consistent quality and mechanical properties, meeting rigorous industry standards for reliability.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in heavy-duty industrial settings, such as machinery construction, automotive assemblies, and structural frameworks. Its 1/2"-13 UNRC coarse thread design facilitates quick installation and robust holding power, while the partially threaded rod type prevents over-tightening and distributes stress evenly. The corrosion-resistant coating combats harsh environments, reducing maintenance downtime. With a 170,000 psi tensile strength and Rockwell C37 hardness, it delivers long-term durability in applications demanding high load-bearing capacity and fatigue resistance, making it a trusted choice for engineers prioritizing safety and efficiency.

Specification Summary & Compliance

This fastener adheres to Class 3A thread fit for precise dimensional accuracy and features a 1/2"-13 UNRC coarse thread with a minimum thread length of 1-1/2". Manufactured in compliance with ASTM A574 specifications, it ensures consistent mechanical properties. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for industrial use.