S-91251A519 1/2"-20 x 7/8" 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 on alloy steel, extending service life in demanding industrial environments.
- Precise Class 3A thread fit provides secure, vibration-resistant connections, minimizing loosening in critical assemblies.
- Fine UNF thread spacing offers improved adjustment accuracy and better load distribution compared to coarse threads.
- Fully threaded design allows for consistent clamping force along the entire length, enhancing joint integrity.
- 3/8" hex drive compatibility enables easy installation with standard tools, reducing assembly time and labor costs.
- High hardness (Rockwell C37) resists wear and deformation, maintaining dimensional stability through repeated use.
Professional Applications & Engineering Value
Engineered for high-performance industrial applications, this black-oxide alloy steel socket head cap screw addresses common challenges in machinery, automotive, and heavy equipment assembly. The Class 3A UNF fine thread ensures tight tolerances and superior vibration resistance, critical for dynamic load environments. Its fully threaded right-hand design with a 3/8" hex drive facilitates quick, secure installation in confined spaces, while the 170,000 psi tensile strength and Rockwell C37 hardness provide durability against shock and fatigue. Ideal for precision engineering where reliability and compliance are paramount, this screw minimizes maintenance needs and enhances operational safety.
Specification Summary & Compliance
This socket head cap screw features a 1/2"-20 UNF thread with Class 3A fit, ensuring high precision and interchangeability. It meets ASTM A574 specifications for alloy steel socket head cap screws, guaranteeing consistent material and manufacturing quality. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible sourcing and use in global markets.
