S-92620A401 4-40 x 1/4" 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 reliable performance in high-stress applications
• Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh environments
• Maximum hardness durability with Rockwell C33 rating ensuring excellent wear resistance and thread integrity
• Precise thread engagement through Class 2A thread fit for consistent assembly and reduced cross-threading risks
• Optimized drive efficiency with external hex head design allowing high torque application and secure fastening
• Full thread coverage along the entire 1/4" length for maximum grip strength and uniform stress distribution
• Industry-standard compliance with SAE J429 specifications guaranteeing consistent quality and performance

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver critical engineering solutions where high tensile strength and corrosion resistance are paramount. The steel construction with zinc yellow-chromate plating provides exceptional protection against environmental degradation in industrial settings, while the 4-40 UNC coarse thread design ensures rapid installation and reliable performance in vibration-prone applications. The external hex drive configuration enables high-torque tightening for heavy machinery, automotive assemblies, and structural frameworks where 150,000 psi tensile strength prevents joint failure under extreme loads. These fully threaded screws maintain consistent clamping force across the entire 1/4" length, making them ideal for critical connections in manufacturing equipment, construction projects, and transportation systems requiring SAE J429 compliance.

Specification Summary & Compliance

These 4-40 UNC hex head screws feature Class 2A thread fit tolerances ensuring precise mating with standard nuts and threaded components. Manufactured to meet SAE J429 specifications for Grade 8 fasteners, they maintain dimensional accuracy across all critical parameters including 1/4" length, 0.112" thread diameter, and standardized coarse thread spacing. The external hex drive with 3/16" head width and 1/16" head height provides consistent tool engagement. Compliance with industry standards ensures reliable performance in mechanical systems requiring right-hand thread direction and fully threaded configurations for maximum fastening security.