S-91251A976 1 1/2"-6 x 12" ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel Socket Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Black-oxide coating on alloy steel provides enhanced corrosion resistance, extending service life in demanding industrial environments.
- Hex socket drive design allows for high-torque installation with a secure fit, minimizing stripping and improving assembly efficiency.
- Coarse UNRC threads enable faster installation and better performance in materials where fine threads may be prone to damage.
- Partially threaded shank offers optimal clamping force distribution, ideal for applications requiring precise joint security.
- Compliance with ASTM A574 guarantees consistent quality and mechanical properties for critical engineering applications.
- Rockwell C37 hardness provides excellent wear resistance, maintaining thread integrity through repeated use.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges such as vibration loosening and material fatigue. The coarse UNRC thread and Class 2A fit ensure quick, reliable fastening in heavy machinery, structural steel connections, and large equipment assembly. Its high tensile strength and Rockwell C37 hardness make it suitable for applications subjected to dynamic loads and harsh conditions, providing long-term reliability. The 12" length with a 3 3/4" minimum thread length offers versatility for deep-set applications, while the black-oxide surface treatment adds an extra layer of durability against environmental factors.
Specification Summary & Compliance
This socket head cap screw features a 1 1/2"-6 UNRC coarse thread with Class 2A tolerance for precise fit. It meets ASTM A574 specifications for high-strength alloy steel fasteners and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in various industrial sectors.
