S-91251A028 1/2"-20 x 3 1/2" 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 industrial applications, reducing failure risks.
- Black-oxide coating on alloy steel provides enhanced corrosion resistance, extending service life in harsh environments.
- Class 3A thread fit offers superior precision and vibration resistance for secure, long-lasting assemblies.
- Fine thread spacing (UNRF) delivers improved clamping force and better load distribution compared to coarse threads.
- Partially threaded design allows for precise grip length control, minimizing material stress and simplifying installation.
- Hex socket drive enables high-torque application with standard tools, reducing slippage and installation time.
- Rockwell C37 hardness ensures excellent wear resistance and durability under repetitive mechanical loads.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, these black-oxide alloy steel socket head cap screws address critical challenges in machinery, automotive, and heavy equipment assembly. The UNRF fine thread configuration enhances joint integrity by providing superior resistance to loosening under dynamic loads and vibrations. With a 170,000 psi tensile strength and Rockwell C37 hardness, they withstand extreme operational stresses without deformation, making them ideal for applications requiring high-strength fasteners with reliable fatigue resistance. The black-oxide surface treatment further protects against rust and chemical exposure, ensuring longevity in corrosive environments while maintaining consistent torque performance.
Specification Summary & Compliance
This socket head cap screw features a 1/2"-20 UNRF thread with Class 3A fit, ensuring precise dimensional accuracy and tight tolerances for secure fastening. Manufactured to ASTM A574 specifications, it guarantees consistent mechanical properties and quality. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming adherence to environmental and safety standards for industrial use.
