S-91268A490 1/4"-20 x 2 1/4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capability with 150,000 psi tensile strength for demanding industrial applications
• Superior resistance to wear and deformation thanks to Rockwell C33 hardness and Grade 8 steel construction
• Reliable fastening with precise fit achieved through Class 2A thread tolerance and UNC coarse threading
• Optimized for high-torque installation featuring a 7/16" external hex head for secure tool engagement
• Versatile partial threading design providing enhanced grip in materials requiring specific unthreaded shank sections
• Long-term environmental compliance meeting RoHS 3 and REACH regulations for safe industrial use
• Proven performance standardization manufactured to ASME B18.2.1 and SAE J429 specifications

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers critical engineering solutions where vibration resistance and structural integrity are paramount. The 1/4"-20 UNC coarse thread configuration ensures rapid installation and superior holding power in steel frameworks, machinery assemblies, and heavy equipment. The partially threaded design allows precise clamp load distribution, preventing joint loosening in high-stress environments. Manufactured from high-strength steel with Rockwell C33 hardness, this fastener withstands extreme mechanical stresses while the external hex drive provides maximum torque transmission for secure installations in confined industrial spaces.

Specification Summary & Compliance

This 2 1/4" length hex head screw features Class 2A thread fit with 1/4"-20 UNC coarse threads in right-hand direction and minimum 3/4" thread length. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 standards, ensuring dimensional accuracy and mechanical properties. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial applications.