S-91268A196 5/16"-18 x 2 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 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 150,000 psi tensile strength for high-stress industrial applications
- Superior wear resistance due to Rockwell C33 hardness, extending service life in demanding environments
- Reliable fastening performance with Class 2A thread fit ensuring precise engagement and vibration resistance
- Quick installation advantage through coarse UNC threading and external hex drive design
- Optimized strength-to-weight ratio using Grade 8 steel material for critical structural connections
- Partial threading design providing both gripping power and clearance where needed
- Regulatory compliance assurance meeting international environmental and safety standards
Professional Applications & Engineering Value
This Grade 8 steel hex head screw delivers critical performance in heavy machinery, construction equipment, and structural assemblies where failure is not an option. The 5/16"-18 UNC coarse thread configuration ensures rapid installation while maintaining superior clamping force, significantly reducing assembly time in production environments. Engineered with partial threading, it provides maximum thread engagement in connected materials while allowing clearance in non-critical sections. The external hex drive accommodates high torque application with standard tools, preventing stripping and ensuring consistent tightening in maintenance operations. With its 150,000 psi tensile strength and hardened steel composition, this fastener solves vibration-induced loosening and material fatigue issues common in industrial equipment, transportation systems, and infrastructure projects.
Specification Summary & Compliance
Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications with Class 2A thread fit tolerance for consistent performance. The inch-system fastener features 5/16"-18 UNC coarse threads with 0.313" diameter and 2 1/2" length. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.
