S-90044A429 5/16"-18 x 2 3/8" ASME B18.3, 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 guarantees secure, vibration-resistant connections, enhancing assembly integrity.
- High hardness rating (Rockwell C37) provides excellent wear resistance, maintaining thread integrity through repeated use.
- Partially threaded design allows for controlled clamping force, ideal for applications requiring specific grip lengths.
- Standard hex drive (1/4") enables easy installation with common tools, speeding up assembly processes.
- Compliance with ASME B18.3 and environmental standards ensures consistent quality and safe use across regulated industries.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in heavy-duty machinery, automotive, and aerospace assemblies. Its coarse UNRC thread (5/16"-18) and Class 3A fit provide superior resistance to loosening under dynamic loads, while the partially threaded rod design optimizes stress distribution. The black-oxide surface treatment significantly enhances corrosion resistance, making it suitable for environments exposed to moisture or chemicals. With a tensile strength of 170,000 psi, it reliably secures high-stress components, reducing downtime and maintenance costs in industrial fastening systems.
Specification Summary & Compliance
This screw features a 5/16"-18 coarse thread with Class 3A precision tolerance, ensuring tight fit and reliability. It conforms to ASME B18.3 manufacturing standards and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global industrial use without hazardous substances.
