S-91251A011 1/2"-20 x 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
- 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
- Precision Class 3A thread fit provides superior engagement and vibration resistance in critical assemblies
- Fine thread spacing delivers enhanced clamping force and improved load distribution
- Fully threaded design allows for maximum adjustability and consistent holding power along entire length
- 3/8" hex drive compatibility enables easy installation with standard industrial tools
- Rockwell C37 hardness maintains structural integrity and prevents deformation under heavy loads
Professional Applications & Engineering Value
These black-oxide alloy steel socket head cap screws are engineered to address critical challenges in high-performance industrial applications. The UNRF fine thread configuration with Class 3A precision fit ensures superior vibration resistance and reliable performance in machinery, automotive, and aerospace assemblies where loosening under dynamic loads is a concern. The 170,000 psi tensile strength combined with Rockwell C37 hardness provides exceptional resistance to shear forces and permanent deformation, making these fully threaded fasteners ideal for heavy-duty equipment, precision tooling, and structural applications requiring consistent clamping force. The black-oxide surface treatment offers enhanced corrosion protection without compromising dimensional accuracy, while the standard 3/8" hex drive ensures compatibility with existing industrial tooling systems.
Specification Summary & Compliance
This socket head cap screw features precision 1/2"-20 UNRF fine threads with Class 3A thread fit for superior dimensional accuracy and engagement. Manufacturing complies with ASTM A574 specification for high-strength alloy steel socket head cap screws. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors. The right-hand thread direction and standard socket head profile maintain industry-standard installation practices.
