S-91251A660 5/16"-18 x 6 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, extending service life in demanding industrial environments
- Exceptional load-bearing capability with 170,000 psi tensile strength for high-stress applications
- Precise thread engagement with Class 3A fit ensuring reliable fastening and vibration resistance
- Optimized installation efficiency through 1/4" hex drive design allowing high-torque application
- Enhanced durability with Rockwell C37 hardness maintaining structural integrity under repeated stress
- Versatile partial threading enabling both clamping and alignment functions in assembly operations
- Industry compliance assurance meeting ASTM A574, RoHS 3, and REACH standards for global applications
Professional Applications & Engineering Value
Engineered for high-performance industrial fastening, this black-oxide alloy steel socket head cap screw addresses critical challenges in machinery assembly, automotive manufacturing, and heavy equipment applications. The 5/16"-18 UNC coarse thread configuration provides rapid installation while maintaining exceptional clamping force, particularly valuable in vibration-prone environments. The partially threaded design allows precise control over joint compression zones, preventing material distortion in precision assemblies. With its 170,000 psi tensile strength and Rockwell C37 hardness, this fastener delivers reliable performance in high-stress applications where failure is not an option, while the black-oxide surface treatment provides essential corrosion protection in industrial atmospheres.
Specification Summary & Compliance
This socket head cap screw features precision Class 3A thread fit with UNC coarse thread profile (5/16"-18) and right-hand thread direction. Manufactured to ASTM A574 specification for alloy steel socket head cap screws, it ensures dimensional consistency and mechanical performance. The product maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for international industrial applications requiring strict material substance control.
