S-92979A155 1/4"-20 x 3/8" IFI 111, SAE J429 Medium-Strength Grade 5 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Superior load-bearing capacity with Grade 5 classification and 110,000 PSI tensile strength for demanding industrial applications
• Enhanced corrosion resistance through zinc-plated steel construction, extending service life in harsh environments
• Precise thread engagement with Class 3A thread fit ensuring reliable fastening and vibration resistance
• Quick installation efficiency through external hex drive design combined with UNC coarse threading
• Distributed load management via integrated flange design that eliminates the need for separate washers
• Consistent mechanical performance maintained through Rockwell C25 hardness rating
• Full-threaded versatility allowing engagement along the entire screw length for flexible positioning

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these Grade 5 hex head screws deliver exceptional reliability in construction, machinery assembly, and equipment manufacturing. The zinc-plated steel construction provides essential corrosion protection for outdoor or humid environments, while the UNC coarse thread design enables faster installation and reduced cross-threading risks compared to fine-thread alternatives. The external hex drive accommodates high-torque applications, and the integrated flange distributes clamping force effectively, preventing surface damage and eliminating the need for additional components. With fully threaded construction, these screws maintain consistent holding power throughout their engagement length, making them ideal for applications requiring adjustable positioning or where vibration resistance is critical.

Specification Summary & Compliance

This fastener meets Class 3A thread tolerance specifications for precision fit and exceeds SAE J429 (IFI 111) requirements for Grade 5 mechanical properties. Manufacturing compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. The UNC coarse thread pattern (1/4"-20) with right-hand thread direction ensures compatibility with standard industrial components and tools.