S-91251A874 6-32 x 1 3/8" 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 under high-stress conditions, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish extends service life in demanding industrial environments.
- Precise Class 3A thread fit provides excellent engagement and vibration resistance, minimizing loosening in critical assemblies.
- High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
- Hex socket drive design allows for easy installation in confined spaces with standard 7/64" tools.
- Partially threaded shank enables secure clamping without unnecessary thread engagement, ideal for precision applications.
- Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety for global supply chains.
Professional Applications & Engineering Value
These black-oxide alloy steel socket head cap screws with 6-32 UNC coarse threads are engineered to address common industrial challenges such as vibration-induced loosening and corrosion in harsh environments. The combination of high tensile strength and Rockwell C37 hardness makes them ideal for machinery, automotive, and aerospace applications where reliability is critical. The partially threaded design provides optimal clamping force distribution while the hex socket drive facilitates installation in tight spaces. Meeting ASTM A574 specifications, these fasteners deliver consistent performance in high-stress assemblies, reducing maintenance needs and downtime.
Specification Summary & Compliance
This socket head cap screw features 6-32 UNC coarse threads with Class 3A thread fit for precision tolerance, manufactured to ASTM A574 standards. The 1-3/8" length includes a minimum 3/4" thread length on a partially threaded shank. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) ensures environmental regulatory adherence for industrial use.
