S-91247A592 5/16"-18 x 2 1/4" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws
Medium-Strength Grade 5 Steel Hex 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 load-bearing capacity with 120,000 psi tensile strength, ideal for high-stress industrial applications
- Superior corrosion resistance from zinc plating, extending service life in harsh environments
- Reliable thread engagement with Class 2A fit and coarse UNC threading for quick assembly and vibration resistance
- Optimized torque transmission through the external hex drive design, preventing tool slippage during installation
- Controlled partial threading allows precise clamping force distribution across joint surfaces
- Certified material integrity with Grade 5 steel and Rockwell C25 hardness ensuring consistent mechanical performance
- Regulatory compliance assurance meeting ASME, SAE, RoHS 3, and REACH standards for global project specifications
Professional Applications & Engineering Value
This 5/16"-18 UNC hex head screw delivers critical engineering solutions for heavy machinery, structural steel connections, and industrial equipment assembly. The Grade 5 steel construction maintains fastener integrity under dynamic loads, while the zinc plating provides essential corrosion protection in manufacturing environments. The coarse thread profile enables rapid installation in structural steel and aluminum components, with partial threading concentrating clamping force precisely where needed. Engineers specify this external hex drive fastener for maintenance-critical applications where proven 120,000 psi tensile strength prevents joint failure in vibration-intensive operations.
Specification Summary & Compliance
Manufactured to ASME B18.2.1 and SAE J429 Grade 5 specifications with Class 2A thread fit ensuring dimensional accuracy. The coarse UNC 5/16"-18 threads maintain 7/8" minimum thread length for reliable engagement. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, with material certification for Rockwell C25 hardness and 120,000 psi tensile strength verification.
