S-94239A102 1/4"-20 x 1" SAE J429 High-Strength Grade 8 Steel Serrated-Flange Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 150,000 psi tensile strength and Rockwell C33 hardness for reliable performance in high-stress applications
• Superior corrosion resistance through zinc-plated steel construction, extending service life in demanding industrial environments
• Enhanced locking stability with serrated flange design that prevents loosening under vibration and dynamic loads
• Optimal torque transmission through external hex drive and 3/8" head width for secure installation with standard tools
• Precision threading compatibility with Class 2A UNC coarse threads ensuring consistent engagement and reduced cross-threading risks
• Full-length threading provides maximum grip along the entire 1" length for superior fastening in thick materials
• Regulatory compliance assurance meeting IFI 111, SAE J429, RoHS 3 and REACH standards for quality and environmental safety

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver critical engineering solutions where high tensile strength and vibration resistance are paramount. The zinc-plated steel construction provides essential corrosion protection for outdoor equipment, machinery assemblies, and structural applications exposed to harsh environments. The combination of external hex drive and serrated locking flange creates a dual-securement system that maintains clamp force under extreme vibration, making them ideal for automotive components, heavy machinery, and construction equipment. The 1/4"-20 UNC coarse thread configuration ensures rapid installation and reliable performance in steel frameworks, while the fully threaded design maximizes pull-out resistance in critical joints. These industrial-grade flanged hex screws represent the gold standard for applications demanding both mechanical strength and long-term reliability.

Specification Summary & Compliance

Manufactured to precise Class 2A thread fit tolerances with UNC coarse threading (1/4"-20) and right-hand thread direction. The fastener meets IFI 111 and SAE J429 Grade 8 specifications for material composition and mechanical properties. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and restricted substance management. Physical dimensions include 1" length, 3/8" head width, and 9/16" flange diameter for consistent performance across industrial applications.