S-91251A440 1/4"-28 x 3/4" 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 in demanding applications.
- Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life and maintaining integrity in harsh industrial environments.
- Precise Class 3A thread fit with UNRF fine threads provides secure, vibration-resistant connections, minimizing loosening in critical assemblies.
- Hex socket drive design allows for easy installation and high torque application in confined spaces, improving assembly efficiency.
- Full threading along the 3/4" length offers versatile fastening depth and uniform load distribution, enhancing joint stability.
- High hardness (Rockwell C37) increases wear resistance and durability, ensuring long-term reliability in repetitive use scenarios.
- Compliance with ASTM A574 guarantees consistent quality and performance, meeting rigorous industrial standards for socket head cap screws.
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 machinery, automotive, and aerospace assemblies. The UNRF fine thread and Class 3A fit ensure tight, secure fastening that withstands dynamic loads, while the hex drive facilitates quick installation in tight spaces. Its high tensile strength and hardness make it ideal for heavy-duty applications where reliability is critical, reducing maintenance needs and downtime. The black-oxide coating further enhances resistance to environmental factors, providing long-lasting performance in demanding conditions.
Specification Summary & Compliance
This screw features a 1/4"-28 UNRF fine thread with Class 3A thread fit for precise dimensional accuracy, manufactured in accordance with ASTM A574 specifications. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for global industrial use.
