S-91247A026 1/4"-28 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
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior load-bearing capacity with Grade 5 classification and 120,000 psi tensile strength for reliable performance in demanding applications
- Enhanced corrosion resistance through zinc plating, extending service life in various industrial environments
- Precise thread engagement with UNF fine threading and Class 2A fit ensuring secure, vibration-resistant connections
- Optimized torque transmission via external hex drive design allowing for high tightening forces with standard tools
- Partial threading design providing unthreaded shank section for improved shear strength and alignment
- Consistent hardness performance with Rockwell C25 rating maintaining structural integrity under stress
- Regulatory compliance assurance meeting ASME B18.2.1, RoHS 3, and REACH standards for quality and environmental safety
Professional Applications & Engineering Value
These Grade 5 hex head screws deliver exceptional engineering value through their zinc plated steel construction and UNF fine threading, specifically designed to address common 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 joint integrity are critical. The external hex drive facilitates efficient installation with standard tools while the partial threading offers superior resistance to shear forces. These industrial fasteners are engineered to maintain clamping force in demanding applications, preventing loosening and ensuring long-term operational safety in construction, automotive, and manufacturing sectors.
Specification Summary & Compliance
This 1/4"-28 x 3-1/2" hex head screw features precise Class 2A thread fit tolerances and UNF fine threading manufactured to exacting standards. The fastener complies with ASME B18.2.1 dimensional specifications and SAE J429 Grade 5 mechanical requirements. Environmental compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) certifications, ensuring adherence to current regulatory standards for industrial components.
