S-92316A581 5/16"-18 x 3/4" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 150,000 PSI ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the black phosphate coating extends service life in demanding industrial environments.
• Heavy-duty Grade 8 classification guarantees consistent mechanical properties and load-bearing capacity for critical assemblies.
• Coarse UNC threads with Class 2A fit provide faster installation and superior vibration resistance compared to fine-thread alternatives.
• Integrated flange design eliminates the need for separate washers, simplifying inventory and reducing assembly time.
• Full threading along the entire shank allows for maximum adjustability and secure fastening across varying material thicknesses.
• Compliance with major industry standards including SAE J429 ensures interchangeability and quality consistency in OEM and MRO applications.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver critical performance where vibration resistance and structural integrity are paramount. The black phosphate steel construction provides superior corrosion protection without compromising the 150,000 PSI tensile strength, making these fully threaded fasteners ideal for construction equipment, automotive frames, and machinery assemblies. The coarse UNC thread profile ensures rapid installation in steel-to-steel connections while maintaining Class 2A thread fit precision. The integrated flange distributes clamping force effectively, preventing surface damage and maintaining joint integrity under dynamic loads. These SAE J429 compliant screws represent the optimal balance between maximum durability and installation efficiency for professional users.

Specification Summary & Compliance

Manufactured to IFI 111/SAE J429 specifications with Class 2A thread fit tolerances ensuring consistent dimensional accuracy. The 5/16"-18 UNC coarse thread maintains standardized compatibility across industrial applications. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations guarantees safe use in regulated industries. Mechanical properties include Rockwell C32 hardness and 150,000 PSI tensile strength as verified per Grade 8 requirements.