S-91274A248 5/16"-18 x 1 1/4" ASME B18.3, ASTM A574, ASTM B117 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 corrosion resistance with zinc-flake coating, ensuring long-term reliability in harsh industrial environments
- Superior tensile strength of 170,000 psi for heavy-duty applications requiring maximum load-bearing capacity
- Precision Class 3A thread fit providing secure, vibration-resistant fastening with minimal backlash
- Rockwell C37 hardness rating delivering excellent wear resistance and durability under repeated stress
- Hex socket drive design allowing for high-torque installation in confined spaces
- Full compliance with ASME B18.3 and ASTM A574 standards guaranteeing consistent quality and dimensional accuracy
- RoHS 3 and REACH environmental compliance meeting international regulatory requirements for industrial use
Professional Applications & Engineering Value
This 5/16"-18 UNC socket head cap screw delivers critical performance advantages for demanding industrial applications. The zinc-flake-coated alloy steel construction provides superior corrosion protection compared to standard coatings, making it ideal for machinery, automotive assemblies, and outdoor equipment exposed to moisture and chemicals. The coarse UNC thread with Class 3A fit ensures rapid installation and exceptional vibration resistance, while the hex socket drive enables high-torque tightening in space-constrained applications. With 170,000 psi tensile strength and Rockwell C37 hardness, this fastener maintains integrity under extreme mechanical stress, preventing thread stripping and head deformation in heavy-duty fastening systems.
Specification Summary & Compliance
This socket head cap screw features 5/16"-18 UNC coarse threads with precision Class 3A thread fit for superior engagement. Manufacturing complies with ASME B18.3 dimensional standards and ASTM A574 material specifications. Corrosion resistance testing meets ASTM B117 requirements. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.
