S-91251A602 1 1/4"-12 x 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 industrial applications, reducing the risk of fastener failure.
- Corrosion-resistant black-oxide finish on alloy steel enhances durability and extends service life in harsh environments.
- UNRF fine thread design provides superior vibration resistance and improved clamping force compared to coarse threads.
- Class 2A thread fit offers consistent, easy assembly while maintaining secure fastening in precision machinery.
- 7/8" hex drive socket head allows for high-torque installation with standard tools, speeding up assembly processes.
- Partially threaded shank design concentrates thread engagement where needed, optimizing strength-to-weight ratio.
- Full compliance with ASTM A574 guarantees material quality and manufacturing consistency for engineering-critical applications.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw delivers critical performance where standard fasteners fail. The UNRF fine thread configuration maintains clamp load under vibration, making it ideal for heavy machinery, automotive systems, and precision equipment. With 170,000 psi tensile strength and Rockwell C37 hardness, it withstands extreme mechanical stresses while the black-oxide surface treatment provides corrosion protection without dimensional compromise. The 4" length and partially threaded design offer versatility in structural assemblies where unthreaded shank sections prevent thread damage during adjustment. Engineers specify this ASTM A574-compliant fastener for applications demanding repeatable precision and long-term reliability.
Specification Summary & Compliance
This socket head cap screw features 1 1/4"-12 UNRF fine threads with Class 2A fit for consistent dimensional accuracy. Manufacturing follows ASTM A574 specifications for alloy steel socket head cap screws. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across industrial sectors.
