S-91247A010 1/4"-28 x 1 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 for reliable performance in high-stress assemblies
- Superior corrosion resistance through zinc plating that protects against rust in demanding industrial environments
- Precise thread engagement with Class 2A UNF fine threads ensuring secure fastening and vibration resistance
- Optimized torque transmission via external hex drive design that prevents tool slippage during installation
- Enhanced durability from Rockwell C25 hardness that maintains structural integrity under repeated use
- Versatile partial threading allowing both clamping and alignment functions in diverse assembly applications
- Regulatory compliance assurance meeting ASME B18.2.1, RoHS 3, and REACH standards for global industrial use
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 combined with UNF fine threading creates an optimal fastening system for machinery, automotive components, and structural assemblies subjected to dynamic loads. The partially threaded design provides superior clamping force while allowing precise alignment in multi-material applications. With external hex drive compatibility, installers achieve maximum torque efficiency without damaging the fastener head. These industrial-grade screws effectively prevent joint failure in vibrating environments while maintaining Class 2A thread fit precision throughout their service life.
Specification Summary & Compliance
Manufactured to ASME B18.2.1 specifications with Class 2A thread fit tolerances ensuring dimensional accuracy. The 1/4"-28 UNF fine thread maintains consistent pitch diameter while the 1-1/4" length provides versatile fastening options. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations guarantees environmental safety standards. Meets SAE J429 Grade 5 mechanical properties including 120,000 psi tensile strength and Rockwell C25 hardness for guaranteed performance in inch-system applications.
