S-90044A528 5/16"-18 x 3 1/4" 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 prolongs service life in harsh industrial environments, minimizing maintenance needs.
- Precise Class 3A thread fit guarantees secure, vibration-resistant assemblies with consistent clamping force.
- High hardness (Rockwell C37) provides excellent wear resistance, maintaining thread integrity through repeated use.
- Standard hex socket drive allows for easy installation with common tools, streamlining assembly processes.
- Fully threaded design offers maximum grip length and flexibility in various material thicknesses.
- Compliance with major standards including ASME B18.3 ensures dimensional accuracy and interchangeability.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw delivers critical performance where reliability is non-negotiable. The combination of 170,000 psi tensile strength and Rockwell C37 hardness addresses common failure points in heavy machinery, automotive, and aerospace assemblies subjected to dynamic loads and vibrations. The coarse UNRC thread with Class 3A fit ensures rapid installation while maintaining superior resistance to loosening. The black-oxide surface treatment provides an added layer of protection against corrosion in demanding environments, extending service intervals. Engineered for precision equipment, structural frames, and high-torque applications, this socket head cap screw offers predictable performance that reduces downtime and maintenance costs.
Specification Summary & Compliance
This fastener maintains Class 3A thread tolerance for precision fit and meets ASME B18.3 dimensional specifications under ASTM A574 material standards. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industries. The 5/16"-18 coarse thread and fully threaded design provide consistent mechanical properties across the entire 3-1/4" length.
