S-91283A252 1 1/4"-7 x 5" 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 100,000 psi tensile strength for reliable performance in demanding applications
- Superior thread engagement through UNC coarse threading that resists vibration loosening and enables faster installation
- Precision manufacturing with Class 2A thread fit ensuring consistent quality and proper mating with nuts
- Enhanced durability from Rockwell C19 hardness steel construction that withstands wear and corrosion
- Optimized torque transmission via the external hex drive design that prevents tool slippage during installation
- Regulatory compliance assurance meeting ASME B18.2.1, RoHS 3, and REACH standards for quality and environmental safety
- Versatile partial threading providing both gripping strength and clearance where needed in assembly applications
Professional Applications & Engineering Value
This Grade 5 hex head screw delivers critical engineering solutions for industrial applications where high-strength fastening is paramount. The 1-1/4"-7 UNC coarse thread configuration provides superior resistance to vibration-induced loosening in heavy machinery, structural steel connections, and equipment assembly. Manufactured from steel with Rockwell C19 hardness, this fastener maintains integrity under extreme loads while the external hex drive ensures efficient installation with standard tools. The partially threaded design offers optimal clamping force distribution, making it ideal for applications requiring both secure fastening and clearance, such as construction frameworks, industrial machinery, and transportation equipment where reliability cannot be compromised.
Specification Summary & Compliance
This 5" length hex head screw features precision Class 2A thread fit with 1-1/4"-7 UNC coarse threading and 2-3/4" minimum thread length. Manufactured to ASME B18.2.1 specifications and SAE J429 Grade 5 standards, it delivers consistent dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory adherence for industrial applications worldwide.
