S-91268A290 1/4"-20 x 3" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 150,000 PSI tensile strength for demanding industrial applications
• Superior wear resistance due to Rockwell C33 hardness, extending service life in high-stress environments
• Reliable fastening performance with fully threaded UNC coarse design ensuring maximum thread engagement
• Precise installation control through Class 2A thread fit and external hex drive for consistent torque application
• Enhanced corrosion protection with compliant steel construction meeting rigorous industry standards
• Optimized for heavy machinery with Grade 8 certification providing guaranteed mechanical properties
• Regulatory compliance assurance meeting ASME, SAE, RoHS 3 and REACH requirements for global applications

Professional Applications & Engineering Value

Engineered for critical structural connections in heavy equipment, construction machinery, and industrial assemblies, these Grade 8 hex head screws deliver unmatched reliability where failure is not an option. The 1/4"-20 UNC coarse thread configuration provides rapid installation and superior resistance to vibration loosening, while the fully threaded design ensures consistent clamping force along the entire 3" length. Manufactured from high-strength steel with Rockwell C33 hardness, these fasteners withstand extreme mechanical stresses and repetitive loading cycles that would compromise inferior components. The external hex drive facilitates high-torque installation in confined spaces, making them ideal for maintenance operations and OEM applications requiring predictable performance under demanding conditions.

Specification Summary & Compliance

This heavy-duty hex head screw features precision Class 2A thread fit with 1/4"-20 UNC coarse thread specifications, manufactured to exacting ASME B18.2.1 and SAE J429 standards. The fastener maintains dimensional accuracy throughout its 3" fully threaded length with consistent 0.5" thread diameter. Compliance certifications include RoHS 3 (2015/863/EU) for hazardous substance restriction and REACH (EC 1907/2006) for chemical safety, ensuring environmental responsibility while delivering Grade 8 mechanical properties with verified 150,000 PSI tensile strength.