S-91251A620 5/16"-18 x 1 3/8" 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 prolongs service life in harsh industrial environments, minimizing maintenance needs.
- Precise Class 3A thread fit provides secure, vibration-resistant connections for improved assembly integrity and safety.
- Hex socket drive design allows for easy installation in confined spaces with standard tools, enhancing efficiency and reducing labor time.
- Fully threaded shank offers consistent clamping force along the entire length, ideal for adjustable or deep-set applications.
- Compliance with ASTM A574 guarantees material quality and manufacturing consistency, ensuring dependable performance in critical uses.
- RoHS 3 and REACH compliance supports environmental and safety standards, making it suitable for global supply chains and regulated industries.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges such as vibration loosening, corrosion-induced degradation, and high-load demands. The coarse UNRC threads and Class 3A fit ensure quick, secure fastening in machinery, automotive assemblies, and heavy equipment, reducing downtime from thread stripping or misalignment. Its high tensile strength and Rockwell C37 hardness provide durability in dynamic applications, while the hex drive facilitates easy access in tight spaces. Ideal for industrial screws in manufacturing and construction, it delivers long-term reliability and cost savings by minimizing replacement cycles and maintenance interventions.
Specification Summary & Compliance
This socket head cap screw features a 5/16"-18 coarse thread with Class 3A tolerance for precise fit, adhering to UNRC thread standards. It is manufactured in compliance with ASTM A574 specifications, ensuring consistent quality and performance. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious and regulated industrial applications.
