S-90128A591 5/16"-18 x 2" 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.
- Zinc-plated alloy steel construction provides superior corrosion resistance, extending service life in harsh industrial environments.
- Class 3A thread fit offers precise, tight tolerances for secure fastening and vibration resistance in critical assemblies.
- Rockwell C37 hardness delivers excellent wear resistance and durability, minimizing deformation under load.
- Partially threaded design allows for controlled clamping force and easy alignment in machined components.
- Hex socket drive enables high-torque installation with standard tools, improving assembly efficiency and reducing strip-out.
- Compliance with ASTM A574, RoHS 3, and REACH ensures material consistency and environmental safety for global supply chains.
Professional Applications & Engineering Value
Engineered for demanding industrial applications, this 5/16"-18 UNC socket head cap screw addresses common challenges like vibration loosening and corrosion in machinery, automotive, and heavy equipment assemblies. The zinc-plated alloy steel material combats rust in humid or outdoor settings, while the coarse thread spacing and Class 3A thread fit provide quick installation and secure holding power in tapped holes. With a partially threaded rod type, it concentrates clamping force precisely, preventing joint slippage in dynamic loads. Ideal for precision socket cap screw uses where ASTM A574 compliance guarantees consistent mechanical properties, this fastener enhances assembly reliability and reduces maintenance downtime.
Specification Summary & Compliance
This socket head cap screw features a 5/16"-18 UNC thread with Class 3A fit for tight dimensional accuracy, and a coarse thread spacing for efficient engagement. It meets ASTM A574 specifications for high-strength alloy steel bolts, ensuring uniform manufacturing quality. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it supports environmentally safe and restricted substance-free operations in global markets.
