S-91251A965 1/2"-20 x 1/2" 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 on alloy steel, extending service life in demanding industrial environments.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant connections in critical assemblies.
- Fine UNF thread design offers improved adjustment accuracy and better load distribution compared to coarse threads.
- Fully threaded shank allows for maximum grip length and uniform clamping force across the entire engagement.
- 3/8" hex drive socket head enables easy installation with standard tools, even in confined spaces.
- Rockwell C37 hardness delivers excellent wear resistance, maintaining thread integrity through repeated use.
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 Class 3A UNF fine thread ensures minimal backlash and superior holding power in precision machinery, automotive assemblies, and heavy equipment. The fully threaded design allows for consistent clamping in variable material thicknesses, while the ASTM A574 compliance guarantees material consistency and performance reliability. Ideal for applications requiring high tensile strength and corrosion resistance, these screws provide long-term durability in harsh operating conditions, reducing maintenance frequency and downtime.
Specification Summary & Compliance
This socket head cap screw features a 1/2"-20 UNF fine thread with Class 3A fit for precise engagement, manufactured to ASTM A574 specifications. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions adherence. The inch system measurements, including a 3/4" head diameter and 1/2" length, provide dimensional accuracy for consistent assembly across standardized industrial applications.
