S-90044A143 5/16"-18 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 of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish extends service life in harsh industrial environments, minimizing maintenance needs.
- Precise Class 3A thread fit provides secure, vibration-resistant connections, enhancing assembly integrity and safety.
- High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use and disassembly.
- Standard hex drive design allows for easy installation and removal with common tools, improving workflow efficiency.
- Coarse UNRC threading enables quick assembly and strong holding power, ideal for demanding mechanical fastening tasks.
- Full threading along the 3" length ensures uniform load distribution and versatile positioning in various applications.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this black-oxide alloy steel socket head cap screw addresses critical challenges in machinery, automotive, and construction sectors. The high tensile strength (170,000 psi) and Rockwell C37 hardness prevent stripping and deformation under extreme loads, while the Class 3A thread fit and coarse UNRC threads deliver superior resistance to loosening from vibrations. The black-oxide surface treatment provides a durable barrier against moisture and chemicals, making it an ideal corrosion-resistant fastener for outdoor or corrosive environments. Its fully threaded design and standard hex drive facilitate precise adjustments and reliable clamping force, ensuring long-term performance in precision socket head bolt applications where safety and durability are paramount.
Specification Summary & Compliance
This socket head cap screw features a 5/16"-18 thread size with Class 3A thread fit and coarse thread spacing, ensuring high dimensional accuracy per UNRC standards. It is manufactured in compliance with ASTM A574 specifications for alloy steel socket head cap screws, and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulatory requirements, confirming its suitability for global industrial use without hazardous substances.
