S-91247A227 3/8"-24 x 2 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
- Exceptional load-bearing capacity with Grade 5 classification and 120,000 psi tensile strength for reliable performance in demanding applications
- Superior corrosion resistance through zinc plating that protects against rust and extends service life in harsh environments
- Precise thread engagement with UNF fine threading and Class 2A fit ensuring secure fastening and vibration resistance
- Optimized torque transmission via external hex drive design that allows high tightening forces without slippage
- Enhanced installation efficiency with partially threaded shank that reduces friction in non-threaded sections
- Industry-standard compatibility meeting ASME B18.2.1 specifications for consistent performance across industrial systems
- Environmental compliance assurance with RoHS 3 and REACH adherence for safe use in regulated applications
Professional Applications & Engineering Value
This Grade 5 hex head screw delivers critical engineering solutions where high tensile strength and corrosion resistance are paramount. The zinc plated steel construction provides durable protection against environmental factors, while the 3/8"-24 UNF fine threading offers superior vibration resistance in machinery, automotive assemblies, and structural frameworks. The partially threaded design reduces binding during installation, making it ideal for applications requiring precise clamp load distribution. With Rockwell C25 hardness and external hex drive, this fastener maintains integrity under repeated torque cycles, solving common failure points in heavy-duty industrial equipment and manufacturing systems where reliability cannot be compromised.
Specification Summary & Compliance
Manufactured to exact Class 2A thread fit tolerances with UNF thread form and ASME B18.2.1 specifications. Compliant with SAE J429 Grade 5 strength requirements, RoHS 3 (2015/863/EU) hazardous substance restrictions, and REACH (EC 1907/2006) chemical safety standards. Thread diameter: 0.375", minimum thread length: 1", total length: 2 1/2".
