S-94239A122 5/16"-18 x 1" IFI 111 High-Strength Grade 8 Steel Serrated-Flange Hex Head Screws

Key Features & Benefits at a Glance

• Maximum load-bearing capacity with 150,000 psi tensile strength and Rockwell C33 hardness for demanding industrial applications
• Superior corrosion protection through zinc yellow-chromate plating that extends service life in harsh environments
• Enhanced installation security with external hex drive design providing positive torque transmission and slip resistance
• Reliable thread engagement featuring UNC coarse threads with Class 2A fit for consistent performance in vibration-prone applications
• Integrated flange design eliminates need for separate washers while providing increased bearing surface area
• Full threading capability ensures complete engagement along the entire 1" length for maximum holding power
• Industry compliance assurance meeting IFI 111 and SAE J429 specifications for quality and performance verification

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver exceptional performance where failure is not an option. The zinc yellow-chromate plated steel construction provides critical corrosion resistance in manufacturing, construction, and machinery applications exposed to environmental elements. The UNC coarse thread pattern with Class 2A thread fit ensures reliable installation in materials where fine threads might strip or fail, while the external hex drive allows for high-torque applications without cam-out concerns. The integrated flange design distributes clamping force effectively, making these fully threaded screws ideal for structural connections, heavy equipment assembly, and high-vibration environments where joint integrity is paramount.

Specification Summary & Compliance

This 5/16"-18 hex head screw features precision Class 2A thread fit tolerances with UNC coarse threading and right-hand thread direction. Manufactured to exacting Grade 8 standards with 150,000 psi tensile strength and Rockwell C33 hardness. Full compliance with IFI 111 and SAE J429 specifications ensures consistent quality and performance. The zinc yellow-chromate plating provides RoHS and REACH compliant corrosion protection. Dimensions include 1" length, 1/2" head width, 21/64" head height, and 11/16" flange diameter for standardized installation across industrial applications.