S-91251A657 5/16"-18 x 4 1/4" 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 applications, reducing the risk of fastener failure.
- Black-oxide coating on alloy steel provides enhanced corrosion resistance, extending service life in demanding environments.
- Class 3A thread fit offers superior precision and tighter tolerances for secure, vibration-resistant connections.
- Rockwell C37 hardness delivers excellent wear resistance, maintaining thread integrity through repeated use.
- 1/4" hex drive design allows for easy installation and removal with standard tools, improving assembly efficiency.
- Partially threaded shank enables precise clamping force control, ideal for applications requiring specific grip lengths.
- Compliance with ASTM A574, RoHS 3, and REACH ensures adherence to industry standards and environmental regulations for global sourcing.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these socket head cap screws address critical challenges in machinery assembly, automotive systems, and construction equipment. The black-oxide alloy steel construction combats rust and oxidation in humid or corrosive settings, while the UNC coarse thread design facilitates quick installation and resists loosening under dynamic loads. With a high tensile strength of 170,000 psi and Class 3A thread fit, these fasteners provide secure, long-lasting connections in high-vibration environments, reducing maintenance downtime and enhancing operational reliability. Their partially threaded configuration allows for optimized load distribution, making them suitable for precision engineering tasks where exact clamping is essential.
Specification Summary & Compliance
This 5/16"-18 UNC socket head cap screw features precise Class 3A thread fit with coarse threading for robust 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.
