S-91251A317 7/8"-14 x 6" 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.
- Precision Class 3A thread fit provides tighter tolerances for secure, vibration-resistant connections in critical assemblies.
- High hardness rating (Rockwell C37) enhances wear resistance, maintaining fastener integrity through repeated use.
- 3/4" hex drive design allows for high-torque installation with standard tools, streamlining assembly processes.
- Partially threaded shank offers optimal grip length control, preventing thread damage in clamped materials.
- Compliance with ASTM A574, RoHS 3, and REACH ensures material consistency and environmental responsibility for global projects.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw delivers critical performance in heavy machinery, automotive, and construction applications where high tensile strength and corrosion protection are paramount. The 7/8"-14 UNRF fine thread configuration provides superior resistance to loosening under dynamic loads, while the socket head design enables installation in confined spaces. Engineered to ASTM A574 specifications, this fastener maintains dimensional stability under extreme pressures, solving common challenges of joint failure and material degradation in industrial assemblies. The combination of 170,000 psi tensile strength and Class 3A thread fit ensures reliable, long-term performance in critical bolting applications.
Specification Summary & Compliance
This socket head cap screw features precision Class 3A thread fit with UNRF fine thread spacing and 2 1/4" minimum thread length. Manufactured to ASTM A574 standards with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The inch system measurement ensures compatibility with North American industrial specifications and tooling requirements.
