S-90044A172 1/2"-20 x 3" 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
- Superior corrosion resistance with black-oxide coating for extended service life in demanding industrial environments
- Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress applications
- Precise Class 3A thread fit provides superior engagement and vibration resistance in critical assemblies
- Optimal hardness rating of Rockwell C37 maintains structural integrity and prevents stripping during installation
- Full-threaded design offers maximum grip length and uniform load distribution across the entire fastener
- Fine thread spacing delivers enhanced clamping force and improved resistance to loosening under dynamic loads
- Standard hex drive compatibility with 3/8" drive tools enables efficient installation in confined spaces
Professional Applications & Engineering Value
These black-oxide alloy steel socket head cap screws with 1/2"-20 UNRF fine threads are engineered to solve critical fastening challenges in heavy machinery, automotive manufacturing, and industrial equipment assembly. The Class 3A thread fit ensures precise mating with tapped holes, eliminating play and reducing vibration-induced failures. The fully threaded design provides consistent clamping force along the entire 3" length, making them ideal for applications requiring uniform pressure distribution. The black-oxide surface treatment offers superior corrosion protection without compromising dimensional accuracy, while the hex socket drive allows for high-torque installation in space-constrained environments where wrench clearance is limited.
Specification Summary & Compliance
Manufactured to exacting ASTM A574 specifications with Class 3A thread fit tolerance for precision applications. Features UNRF fine thread profile with right-hand direction and 1/2"-20 thread size. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets. The Rockwell C37 hardness and 170,000 psi tensile strength meet rigorous industrial fastener requirements for high-stress applications.
