S-91286A135 1/4"-28 x 1" 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, ideal for high-stress industrial assemblies
• Superior corrosion protection through zinc-flake coating, extending service life in harsh environments
• Precision threading with Class 2A UNF fine threads ensuring vibration-resistant, secure fastening
• Maximum thread engagement via full threading along the 1" length for enhanced grip strength
• Optimized drive efficiency with external hex head design enabling high-torque installation
• Guarded against material failure through Rockwell C33 hardness and Grade 8 certification
• Regulatory compliance assurance meeting ASME, SAE, RoHS 3, and REACH standards for global supply chain integration

Professional Applications & Engineering Value

Engineered for heavy-duty fastening applications, these Grade 8 hex head screws solve critical challenges in machinery assembly, structural frameworks, and automotive systems. The zinc-flake coated steel construction provides exceptional corrosion resistance where environmental factors threaten fastener integrity. With 1/4"-28 UNF fine threading maintaining clamp force under dynamic loads, and external hex drive facilitating rapid installation with standard tools, these screws deliver reliable performance in high-vibration environments. The fully threaded design ensures uniform stress distribution across the entire 1" length, preventing joint loosening in demanding industrial settings.

Specification Summary & Compliance

Manufactured to Class 2A thread fit tolerances with UNF (Unified National Fine) thread form per ASME B18.2.1 specifications. Compliant with SAE J429 Grade 8 mechanical properties, RoHS 3 (2015/863/EU) hazardous substance restrictions, and REACH (EC 1907/2006) chemical regulations. Right-hand threaded with external hex drive configuration for standardized tool compatibility across inch-system applications.