S-91251A467 1/4"-28 x 3" 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.
- Corrosion-resistant black-oxide finish on alloy steel extends service life in harsh industrial environments, minimizing maintenance needs.
- Precise Class 3A thread fit with UNRF fine threads provides superior vibration resistance and secure fastening in critical assemblies.
- Hex socket drive design allows for high-torque installation and easy access in confined spaces, improving assembly efficiency.
- Partially threaded shank offers optimal grip and alignment, preventing loosening under dynamic loads.
- Rockwell C37 hardness ensures excellent wear resistance and durability, maintaining integrity over 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 Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address common industrial challenges such as vibration-induced loosening and corrosion in demanding environments. Its 1/4"-28 UNRF fine threads and Class 3A thread fit deliver exceptional clamping force and stability, making it ideal for precision machinery, automotive systems, and heavy equipment where reliability is critical. The partially threaded design concentrates stress effectively, while the hex drive facilitates secure installation in tight spaces. With high tensile strength and Rockwell C37 hardness, it withstands extreme operational stresses, reducing downtime and maintenance costs in industrial fastening applications.
Specification Summary & Compliance
This screw features a 1/4"-28 UNRF fine thread with Class 3A thread fit for precise dimensional accuracy, a length of 3", and a partially threaded rod. It meets ASTM A574 specifications for high-strength alloy steel socket head cap screws and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe and reliable use in various industrial sectors.
