S-91251A235 4-48 x 3/16" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• High tensile strength (170,000 psi) ensures reliable performance in demanding industrial applications, reducing failure risks.
• Black-oxide coating on alloy steel provides corrosion resistance and durability, extending service life in harsh environments.
• Class 3A fine thread fit delivers precise, secure fastening with minimal vibration loosening for stable assemblies.
• Fully threaded UNF design allows consistent engagement across the entire length, enhancing load distribution.
• Hex socket drive (3/32") enables easy installation with standard tools, improving assembly efficiency.
• Rockwell C37 hardness offers excellent wear resistance, maintaining thread integrity under repeated use.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety for global supply chains.

Professional Applications & Engineering Value

This 4-48 UNF socket head cap screw is engineered for precision fastening in machinery, automotive, and aerospace sectors where high tensile strength and fine thread spacing are critical. The black-oxide alloy steel construction resists corrosion and wear, addressing common issues like galvanic reaction and fatigue in dynamic loads. Its Class 3A thread fit ensures tight tolerances, reducing the need for re-tightening in vibrating environments. With a fully threaded right-hand design and hex drive, it simplifies installation in confined spaces, boosting productivity while meeting strict ASTM A574 standards for reliability.

Specification Summary & Compliance

This screw features a 4-48 UNF thread size with Class 3A fit for high precision, fine thread spacing, and dimensions including 3/16" length and 0.183" head diameter. Manufactured to ASTM A574 specifications, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are met for industrial use.