S-91247A126 5/16"-24 x 3 1/2" 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
- Enhanced load-bearing capacity with Grade 5 steel construction and 120,000 psi tensile strength for reliable performance in high-stress applications
- Superior corrosion resistance provided by zinc plating, extending service life in harsh industrial environments
- Precise thread engagement with UNF fine threading and Class 2A fit ensuring secure fastening and vibration resistance
- Optimized torque transmission through external hex drive design allowing for efficient installation with standard tools
- Reduced material stress concentration with partially threaded shank design minimizing failure points
- Consistent dimensional accuracy maintained through compliance with ASME B18.2.1 and SAE J429 manufacturing standards
- Environmental compliance assurance meeting RoHS 3 and REACH regulations for safe industrial use
Professional Applications & Engineering Value
This Grade 5 hex head screw delivers exceptional engineering value through its zinc plated steel construction and UNF fine threading, specifically designed to address critical industrial fastening challenges. The combination of 120,000 psi tensile strength and Rockwell C25 hardness provides reliable performance in heavy machinery, structural assemblies, and equipment manufacturing where vibration resistance and long-term durability are paramount. The partially threaded design concentrates strength where needed most while the external hex drive ensures secure tool engagement during installation. This heavy-duty industrial fastener solves common issues of thread stripping, corrosion-induced failure, and installation inefficiency across automotive, construction, and manufacturing applications.
Specification Summary & Compliance
This fastener maintains Class 2A thread fit tolerance with 5/16"-24 UNF fine threading and complies with ASME B18.2.1 and SAE J429 manufacturing specifications. The product meets RoHS 3 (2015/863/EU) compliance and adheres to REACH (EC 1907/2006) regulations regarding substance restrictions, ensuring environmental responsibility and workplace safety standards are fully maintained.
