S-91251A095 1/4"-20 x 6" ASTM A574 Alloy Steel Socket Head Screws

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.
• Black-oxide coating on alloy steel provides enhanced corrosion resistance and a durable, wear-resistant finish for extended service life.
• Class 3A thread fit offers superior precision and tighter tolerances, ensuring secure fastening and vibration resistance in demanding environments.
• Hex socket drive design allows for high torque application and easy installation in confined spaces, improving assembly efficiency.
• Partially threaded shank provides optimal grip and clamping force where needed, minimizing material stress and improving joint integrity.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material consistency, environmental safety, and suitability for regulated industries.
• Coarse UNRC threads enable quick assembly and disassembly, reducing installation time and maintenance efforts.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in heavy-duty industrial settings, such as machinery assembly, automotive components, and construction equipment. The high tensile strength (170,000 psi) and Rockwell C37 hardness ensure durability under dynamic loads and harsh conditions, preventing stripping and fatigue. The Class 3A thread fit with coarse UNRC threads provides reliable engagement and resistance to loosening from vibrations, while the hex drive facilitates secure tightening in limited-access areas. Ideal for applications requiring robust partially threaded fasteners, it enhances structural integrity and reduces maintenance downtime, making it a trusted choice for engineers prioritizing performance and compliance.

Specification Summary & Compliance

This socket head cap screw adheres to precise dimensional standards, including Class 3A thread fit for superior accuracy and UNRC coarse threads with a 1/4"-20 size. Manufactured in compliance with ASTM A574 specifications, it ensures consistent quality and mechanical properties. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for industrial use.