S-90409A129 5/16"-18 x 3" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capability with Grade 8 strength rating and 150,000 PSI tensile strength for reliable performance in demanding applications
• Superior resistance to wear and deformation thanks to Rockwell C32 hardness and high-strength steel construction
• Secure and stable fastening with integrated flange design that distributes load evenly and eliminates the need for separate washers
• Optimized for quick installation featuring coarse 5/16"-18 UNC threads and external hex drive for efficient assembly with standard tools
• Precise thread engagement with Class 2A thread fit ensuring consistent performance and reduced risk of cross-threading
• Versatile partial threading providing unthreaded shank section for enhanced shear strength in structural connections
• Full regulatory compliance meeting SAE J429 specifications and environmental standards including RoHS 3 and REACH

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers critical engineering solutions for heavy machinery, structural steel connections, and industrial equipment where failure is not an option. The high-strength steel composition combined with Rockwell C32 hardness provides exceptional resistance to vibration loosening and material fatigue. The flanged design offers superior bearing surface distribution, preventing surface damage while the 5/16"-18 UNC coarse threads ensure rapid installation in tough materials. Partial threading maintains maximum shank diameter through unthreaded sections, significantly enhancing shear strength for critical structural applications. These industrial hex bolts are engineered to withstand extreme tension and shear forces in construction, automotive, and manufacturing environments where reliability is paramount.

Specification Summary & Compliance

Manufactured to precise inch system dimensions with 3" length and Class 2A thread fit tolerance for consistent performance. Thread specifications include 5/16"-18 UNC coarse thread with right-hand direction and minimum 7/8" thread length. Full compliance with SAE J429 standards for Grade 8 fasteners, along with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures suitability for global industrial applications.