S-91268A221 1 1/4"-7 x 4 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 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 capability with 150,000 psi tensile strength for reliable performance in demanding applications
- Superior wear resistance thanks to Rockwell C33 hardness, ensuring extended service life under repetitive stress
- Optimized thread engagement through partial threading design that prevents over-tightening while maintaining secure fastening
- Industry-standard compatibility with UNC coarse threads and Class 2A fit for easy installation and interchangeability
- Enhanced torque transmission via external hex drive and 1 7/8" head width for straightforward installation with common tools
- Rigorous quality assurance through ASME B18.2.1 and SAE J429 compliance, guaranteeing consistent dimensional accuracy
- Environmental responsibility with RoHS 3 and REACH compliance, ensuring safe use across regulated industries
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical performance in heavy machinery, structural steel connections, and industrial equipment where high tensile strength and durability are paramount. The steel construction with Rockwell C33 hardness provides exceptional resistance to vibration loosening and material fatigue, while the 1 1/4"-7 UNC coarse thread ensures rapid installation and superior holding power in various substrates. The partial threading design concentrates strength where needed most, making these industrial fasteners ideal for applications requiring precise clamp load distribution. With 4 1/2" length and external hex drive, they offer versatile solutions for construction, manufacturing, and maintenance operations demanding reliable, high-strength bolting connections.
Specification Summary & Compliance
This hex head screw features precise Class 2A thread fit with 1 1/4"-7 UNC coarse threads and right-hand direction. Manufacturing conforms to ASME B18.2.1 specifications and SAE J429 Grade 8 requirements. The product maintains compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial applications.
