S-91247A022 1/4"-28 x 2 3/4" 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
- Superior load-bearing capacity with 120,000 psi tensile strength and Rockwell C25 hardness for reliable performance in demanding applications
- Enhanced corrosion resistance through 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 partial threading design providing superior clamping force while reducing material weight
- Standard-compliant engineering meeting ASME B18.2.1 specifications for consistent quality and interchangeability
- Easy installation and removal with external hex drive and 7/16" head width for standard tool compatibility
- Environmental compliance with RoHS 3 and REACH regulations for safe use across various industries
Professional Applications & Engineering Value
This Grade 5 hex head screw delivers exceptional engineering value through its zinc plated steel construction and UNF fine threading. The combination of 120,000 psi tensile strength and Rockwell C25 hardness makes it ideal for heavy machinery, automotive assemblies, and structural applications where vibration resistance and long-term reliability are critical. The partially threaded design concentrates strength where needed most, while the external hex drive ensures quick installation with standard tools. Meeting ASME B18.2.1 standards, this fastener provides consistent performance in industrial settings requiring precision Class 2A thread fit and corrosion protection.
Specification Summary & Compliance
Manufactured to exacting ASME B18.2.1 standards and SAE J429 Grade 5 requirements, this hex head screw features precision Class 2A thread fit with 1/4"-28 UNF fine threading. The fastener maintains dimensional accuracy with 2 3/4" length and 3/4" minimum thread length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across industrial applications while delivering consistent mechanical performance.
