S-91251A299 5/16"-18 x 1 5/8" 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 in high-stress industrial applications, reducing the risk of fastener failure.
- Black-oxide coating on alloy steel provides enhanced corrosion resistance, extending the screw's lifespan in harsh environments.
- Class 3A thread fit offers superior precision and tighter tolerances for secure, vibration-resistant assemblies.
- Hex socket drive design allows for easy installation and removal with standard tools, minimizing assembly time and effort.
- Partially threaded shank enables precise clamping force control, ideal for applications requiring specific grip lengths.
- Compliance with ASTM A574, RoHS 3, and REACH standards guarantees material quality and environmental safety for global industrial use.
- Coarse UNC threads facilitate quick assembly and disassembly, improving efficiency in maintenance and production lines.
Professional Applications & Engineering Value
This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address common industrial challenges, such as vibration loosening and corrosion in demanding environments. The alloy steel construction with a Rockwell C37 hardness ensures durability under heavy loads, while the Class 3A thread fit provides precise engagement to prevent thread stripping. Ideal for machinery, automotive, and aerospace assemblies, the 5/16"-18 UNC coarse thread and hex drive design allow for efficient installation in tight spaces. Its partially threaded configuration offers flexibility in clamping applications, reducing the need for custom fasteners and streamlining inventory management for B2B procurement.
Specification Summary & Compliance
This screw adheres to Class 3A thread fit for high precision and UNC coarse thread standards with a size of 5/16"-18. It meets ASTM A574 specifications for quality assurance and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards for industrial use.
