S-91251A986 7/16"-20 x 5 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
- 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
- Rockwell C37 hardness maintains structural integrity and prevents stripping during repeated installations
- 3/8" hex drive design offers secure tool engagement and reduced cam-out risk during high-torque applications
- Fine thread spacing delivers enhanced clamping force and improved adjustment precision
- Comprehensive compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw addresses critical engineering challenges in heavy machinery, automotive, and aerospace applications where vibration resistance and material integrity are paramount. The UNF fine thread configuration combined with Class 3A thread fit provides superior clamping force distribution, preventing loosening in high-vibration environments. The partially threaded design allows for precise positioning while the socket head profile enables installation in confined spaces. Engineered for applications requiring high tensile strength and reliable fastening performance, this screw maintains structural stability under extreme mechanical stress while the black-oxide surface treatment provides essential corrosion protection in industrial settings.
Specification Summary & Compliance
Manufactured to ASTM A574 specifications with precision Class 3A thread fit and 7/16"-20 UNF fine thread spacing. The screw features Rockwell C37 hardness and 170,000 psi tensile strength with 5-1/2" length and 1-3/8" minimum thread length. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring material safety and regulatory adherence for industrial applications worldwide.
