S-91283A240 1 1/4"-7 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
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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 high-stress applications
- Superior durability and wear resistance thanks to Rockwell C19 hardness and high-quality steel construction
- Optimized installation efficiency with coarse UNC threads and Class 2A fit ensuring quick, secure fastening
- Robust torque transmission via the external hex drive and large 1 7/8" head width for easy tool engagement
- Full-threaded design providing consistent clamping force along the entire 3 1/2" length
- Compliance with industry standards including ASME B18.2.1 for guaranteed dimensional accuracy and performance
- Environmentally responsible manufacturing meeting RoHS 3 and REACH regulations for safe industrial use
Professional Applications & Engineering Value
This Grade 5 hex head screw delivers critical reliability in heavy machinery, structural steel connections, and industrial equipment assembly. The coarse UNC thread design resists vibration loosening while the fully threaded configuration ensures maximum grip length in thick materials. Engineered with 100,000 psi tensile strength and Rockwell C19 hardness, it withstands extreme dynamic loads and impact forces where standard fasteners would fail. The external hex drive accommodates high torque applications, making it ideal for construction, manufacturing, and automotive sectors requiring heavy-duty fastening solutions that maintain integrity under continuous stress.
Specification Summary & Compliance
Manufactured to ASME B18.2.1 specifications with Class 2A thread fit tolerances ensuring precise dimensional accuracy. The 1 1/4"-7 UNC coarse thread maintains proper clearances for reliable engagement. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming absence of restricted substances. Meets SAE J429 Grade 5 mechanical properties for consistent performance in industrial applications requiring verified strength standards.
