S-91251A411 6-40 x 5/8" 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 under high-stress conditions, reducing the risk of fastener failure.
- Precise Class 3A thread fit provides superior engagement and vibration resistance in critical assemblies, minimizing loosening over time.
- Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable, non-reflective finish suitable for industrial environments.
- Fine UNF threads deliver improved clamping force and finer adjustment capabilities compared to coarse threads.
- Rockwell C37 hardness balances toughness and machinability, preventing stripping during installation and extending service life.
- Hex socket drive design allows for high torque application and easy installation in confined spaces with standard tools.
- Full threading along the 5/8" length enables versatile positioning and secure fastening across varying material thicknesses.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges such as vibration-induced loosening and corrosion in demanding applications. The 6-40 UNF fine thread with Class 3A fit ensures tight tolerances and reliable performance in precision machinery, automotive assemblies, and electronic enclosures where high tensile strength and durability are critical. The socket head design with a 7/64" hex drive facilitates secure installation in tight spaces, while the black-oxide surface treatment provides added resistance to wear and environmental factors, making it ideal for OEM and MRO use in harsh operating conditions.
Specification Summary & Compliance
This screw adheres to Class 3A thread fit per UNF standards, ensuring precise dimensional accuracy and interchangeability. Manufactured in compliance with ASTM A574 specifications, it meets rigorous quality benchmarks for socket head cap screws. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming its suitability for use in regulated industries without hazardous substances.
