S-91251A006 7/16"-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
- Exceptional Tensile Strength: Withstands up to 170,000 psi, ensuring reliable performance in high-stress industrial applications.
- Superior Corrosion Resistance: Black-oxide coating on alloy steel provides enhanced durability against rust and environmental factors.
- Precise Thread Fit: Class 3A thread tolerance offers tight, secure fastening with minimal risk of loosening under vibration.
- High Hardness Rating: Rockwell C37 hardness ensures long-lasting wear resistance and reduced deformation during installation.
- Fine Thread Design: UNRF fine threads deliver improved clamping force and better resistance to loosening in dynamic loads.
- Partially Threaded Shank: Allows for unthreaded grip length, providing added shear strength and alignment in assembled components.
- Standard Hex Drive Compatibility: 3/8" hex drive enables easy installation with common tools, reducing assembly time and effort.
Professional Applications & Engineering Value
Engineered for demanding environments, these Black-Oxide Alloy Steel Socket Head Cap Screws address critical challenges in machinery, automotive, and heavy equipment assembly. The UNRF fine thread and Class 3A fit ensure vibration-resistant connections, minimizing maintenance needs in high-cycle operations. With a 170,000 psi tensile strength and Rockwell C37 hardness, they prevent stripping and fatigue failure, while the black-oxide finish extends service life in humid or corrosive conditions. Ideal for partially threaded applications, they provide secure fastening in precision assemblies where shear strength and alignment are paramount.
Specification Summary & Compliance
This socket head cap screw features a 7/16"-20 thread size with Class 3A thread fit and UNRF fine threading for precise engagement. Manufactured to ASTM A574 specifications, it ensures consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting environmental and safety standards for industrial use.
