S-91251A123 1/2"-13 x 9" 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 with black-oxide coating extends service life in demanding industrial environments
- Precision Class 3A thread fit provides secure fastening with minimal play, enhancing assembly stability
- Optimal hardness rating of Rockwell C37 maintains structural integrity under repeated loading conditions
- Deep socket drive design with 3/8" hex allows for high torque application and prevents tool slippage
- Extended 1½" minimum thread engagement ensures superior grip strength in thick materials
- Comprehensive regulatory compliance with RoHS 3 and REACH standards guarantees environmental safety and global acceptance
Professional Applications & Engineering Value
These black-oxide alloy steel socket head cap screws deliver critical performance advantages for heavy machinery, automotive assemblies, and structural frameworks where vibration resistance and load-bearing capacity are paramount. The UNRC coarse thread configuration combined with Class 3A precision threading ensures rapid installation and superior clamping force distribution. The partially threaded design concentrates strength where needed most, while the deep socket head accommodates high-torque applications without stripping. Engineered to ASTM A574 specifications, these industrial fasteners maintain dimensional stability under extreme conditions, making them ideal for critical connections in manufacturing equipment, construction machinery, and transportation systems where failure is not an option.
Specification Summary & Compliance
Manufactured to ASTM A574 standards with Class 3A thread fit tolerance for precision engagement. Features 1/2"-13 UNRC coarse threads with right-hand orientation and 1½" minimum thread length. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures global acceptability for industrial applications.
