S-90128A597 5/16"-18 x 3 1/2" 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 zinc-plated alloy steel extends service life in harsh industrial environments, minimizing maintenance needs.
- Precise Class 3A thread fit provides tight, secure fastening with reduced risk of loosening under vibration or load.
- High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
- Coarse UNC threading allows for quick installation and removal, saving time in assembly and disassembly processes.
- Partially threaded design enables precise clamping force control, ideal for applications requiring specific grip ranges.
- Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety, meeting global industry standards.
Professional Applications & Engineering Value
Engineered for demanding environments, these 5/16"-18 UNC Socket Head Cap Screws deliver robust performance where reliability is critical. The zinc-plated alloy steel construction combats corrosion in outdoor or chemically exposed settings, while the 170,000 psi tensile strength and Rockwell C37 hardness prevent stripping and deformation under heavy loads. The Class 3A thread fit and coarse thread spacing ensure secure fastening in machinery, automotive assemblies, and structural frameworks, reducing downtime from loose connections. With a 1/4" hex drive and standard socket head profile, they offer easy access in confined spaces, making them indispensable for maintenance and manufacturing sectors requiring high-strength, durable industrial fasteners.
Specification Summary & Compliance
These screws feature a 5/16"-18 UNC thread with Class 3A fit for precise dimensional accuracy and coarse thread spacing. Manufactured to ASTM A574 specifications, they ensure consistent quality and performance. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms adherence to environmental and safety regulations, supporting sustainable procurement practices.
