S-91251A541 1/4"-20 x 7/8" 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 in high-stress applications, reducing the risk of fastener failure.
- Superior thread precision with Class 3A fit provides tighter tolerances for secure, vibration-resistant connections in critical assemblies.
- Durable black-oxide finish on alloy steel offers enhanced corrosion resistance, extending service life in harsh industrial environments.
- Hex socket drive design allows for high torque application and easy installation in confined spaces, improving assembly efficiency.
- Fully threaded construction ensures consistent engagement along the entire length, providing uniform clamping force.
- Compliance with ASTM A574 guarantees material quality and manufacturing consistency for engineering reliability.
- RoHS 3 and REACH compliance ensures environmental safety and regulatory acceptance for global industrial use.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw delivers critical performance in demanding applications where high tensile strength and precision thread fit are paramount. The Class 3A UNRC coarse thread provides excellent resistance to loosening under vibration, making it ideal for machinery, automotive, and heavy equipment assemblies. The hex drive enables secure torque transmission without cam-out, while the Rockwell C37 hardness ensures durability against wear. Engineers specify this fastener for structural connections requiring 170,000 psi tensile strength and consistent performance in corrosive environments, supported by full compliance with international standards.
Specification Summary & Compliance
This socket head cap screw features precise 1/4"-20 UNRC coarse threads with Class 3A fit for superior engagement. Manufacturing follows ASTM A574 specifications, ensuring material integrity and dimensional accuracy. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting environmental and safety requirements for industrial use worldwide.
