S-91251A014 1/2"-20 x 1 1/4" 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 in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish prolongs service life in demanding industrial environments.
- Precision Class 3A thread fit guarantees secure, vibration-resistant connections with minimal backlash.
- High hardness (Rockwell C37) provides excellent wear resistance and durability under repetitive loads.
- Fine UNF thread design offers improved clamping force and better adjustment accuracy compared to coarse threads.
- 3/8" hex drive socket head allows for high-torque installation with standard tools, enhancing assembly efficiency.
- Full compliance with ASTM A574, RoHS 3, and REACH ensures material consistency and environmental safety for global supply chains.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these black-oxide alloy steel socket head cap screws address critical challenges in machinery assembly, automotive systems, and precision equipment. The Class 3A UNF fine threads provide superior resistance to loosening under vibration, while the fully threaded design ensures consistent clamping force across the entire length. With a 170,000 psi tensile strength and Rockwell C37 hardness, they withstand extreme mechanical stresses without deformation. The black-oxide surface treatment not only enhances corrosion protection but also reduces galling during installation, making them ideal for high-torque applications where reliability and repeatability are paramount.
Specification Summary & Compliance
This socket head cap screw features a 1/2"-20 UNF fine thread with Class 3A fit for precision tolerance, manufactured in compliance with ASTM A574 specifications. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulatory requirements, ensuring environmental safety and material traceability. Dimensions include a 1-1/4" length, 3/4" head diameter, and 3/8" hex drive for standardized tool compatibility.
