S-91251A285 8-32 x 3 3/4" 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 under high-stress conditions, reducing the risk of fastener failure.
- Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in demanding applications.
- Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable, low-reflectivity finish for extended service life.
- Partially threaded design allows for precise clamping force control and prevents over-tightening in critical joint areas.
- Hex socket drive (9/64") enables high-torque installation with standard tools, ensuring efficient assembly and reduced strip-out risk.
- Coarse UNC threads facilitate quicker installation and better performance in materials where fine threads may be prone to stripping.
- Rockwell C37 hardness balances toughness and machinability, providing excellent wear resistance without brittleness.
Professional Applications & Engineering Value
These black-oxide alloy steel socket head cap screws are engineered to address common industrial challenges such as vibration loosening, corrosion, and high-load demands. The 8-32 UNC coarse thread design ensures rapid and secure fastening in machinery, automotive assemblies, and heavy equipment, where partial threading allows for precise engagement without compromising structural integrity. The hex drive and high tensile strength make them ideal for applications requiring reliable, high-torque fastening in confined spaces. By combining ASTM A574 material standards with a protective black-oxide finish, these screws deliver long-term durability in harsh environments, reducing maintenance frequency and downtime.
Specification Summary & Compliance
This product meets Class 3A thread fit tolerances for precise engagement and is manufactured in accordance with ASTM A574 specifications for alloy steel socket head cap screws. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory adherence for global industrial use.
