S-91251A940 1 1/4"-7 x 4" 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.
- Superior corrosion resistance from the black-oxide finish extends service life in demanding industrial environments.
- High hardness rating (Rockwell C37) provides excellent wear resistance and durability under repetitive loads.
- Coarse UNRC thread design enables faster installation and better grip in various materials, improving assembly efficiency.
- Partially threaded shank allows for precise clamping force distribution and secure joint connections.
- Standard hex socket drive (7/8") offers compatibility with common tools and prevents stripping during high-torque applications.
- Class 2A thread fit ensures consistent, reliable engagement with standard nuts and tapped holes.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these black-oxide alloy steel socket head cap screws deliver exceptional performance where reliability is critical. The combination of 170,000 psi tensile strength and Rockwell C37 hardness makes them ideal for machinery, equipment manufacturing, and structural assemblies subjected to vibration and dynamic loads. The coarse UNRC threads provide superior holding power in both metallic and non-metallic materials, while the black-oxide surface treatment offers enhanced corrosion protection without compromising dimensional accuracy. These partially threaded fasteners allow for precise load distribution, making them perfect for applications requiring controlled clamping force and vibration resistance in construction, automotive, and heavy equipment sectors.
Specification Summary & Compliance
This socket head cap screw features 1 1/4"-7 coarse UNRC threads with Class 2A thread fit for consistent engagement. Manufactured to ASTM A574 specifications with 4" length and 3 1/8" minimum thread length. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for safe industrial use.
