S-92316A721 1/2"-13 x 2 1/4" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with Grade 8 classification and 150,000 psi tensile strength for reliable performance in high-stress applications
• Superior corrosion resistance from black-phosphate steel coating, extending service life in harsh industrial environments
• Optimized torque transmission through external hex drive and 3/4" head width for secure installation with standard tools
• Enhanced vibration resistance with UNC coarse thread spacing and Class 2A fit maintaining tight connections under dynamic loads
• Simplified alignment and distribution via integrated flange design eliminating the need for separate washers
• Controlled thread engagement through partial threading allowing precise clamping force in assembled components
• Rockwell C32 hardness ensuring consistent performance without deformation during repeated use

Professional Applications & Engineering Value

Engineered for demanding industrial applications, this Grade 8 hex head screw delivers critical performance where failure is not an option. The black-phosphate steel construction provides essential corrosion protection for machinery, structural assemblies, and outdoor equipment exposed to moisture and chemicals. The UNC coarse thread configuration ensures rapid installation and superior resistance to vibration loosening in heavy equipment, construction frameworks, and automotive systems. With partial threading and flanged design, it offers precise clamp load control while distributing pressure evenly across connected surfaces. This 1/2"-13 screw maintains integrity under extreme tension, making it ideal for critical joints in manufacturing fixtures, transportation equipment, and infrastructure projects where 150,000 psi tensile strength is paramount for safety and reliability.

Specification Summary & Compliance

Manufactured to precise Class 2A thread fit tolerances with UNC 1/2"-13 coarse thread specifications. Complies with SAE J429 (IFI 111) standards for Grade 8 mechanical properties, ensuring consistent hardness and strength characteristics. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements for industrial use. Dimensions include 2-1/4" length, 1-5/64" flange diameter, and 33/64" head height for standardized installation across compatible applications.