S-91268A150 1/4"-20 x 1 1/4" 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
- Maximum load-bearing capacity with 150,000 psi tensile strength for critical structural applications
- Superior wear resistance due to Rockwell C33 hardness, extending service life in high-stress environments
- Reliable thread engagement through UNC coarse threading and Class 2A fit, preventing cross-threading during installation
- High-torque installation capability with external hex drive design for secure fastening in confined spaces
- Full-length thread coverage ensures consistent clamping force distribution across the entire fastener length
- Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for quality assurance
- Environmental regulation adherence with RoHS 3 and REACH compliance for global manufacturing applications
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver exceptional performance in demanding industrial environments where failure is not an option. The high-strength steel construction combined with UNC coarse threading provides superior resistance to vibration loosening, making them ideal for heavy machinery, structural steel connections, and automotive assemblies. The external hex drive design allows for high torque application with standard tools, while the fully threaded configuration ensures maximum grip length in varied material thicknesses. These industrial fasteners solve critical engineering challenges by maintaining integrity under extreme loads and harsh operating conditions, reducing maintenance frequency and downtime in commercial and manufacturing applications.
Specification Summary & Compliance
This 1/4"-20 x 1-1/4" hex head screw features precision Class 2A thread fit tolerances with UNC coarse thread spacing for reliable engagement. Manufactured to ASME B18.2.1 dimensional standards and SAE J429 material specifications, ensuring consistent quality and performance. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations guarantees safe use in global manufacturing applications without hazardous substance restrictions.
