S-91247A229 3/8"-24 x 2 3/4" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional strength and reliability with Grade 5 classification, providing 120,000 psi tensile strength for demanding industrial applications
• Superior corrosion resistance through zinc plating, extending service life in harsh environments and reducing maintenance costs
• Precise thread engagement with UNF fine threading and Class 2A fit, ensuring secure fastening and vibration resistance
• Optimized load distribution from the partially threaded design with 1" minimum thread length, concentrating strength where needed most
• Easy installation and removal with external hex drive and standard 9/16" head width, compatible with common tools
• Consistent performance backed by Rockwell C25 hardness, maintaining structural integrity under repeated stress
• Regulatory compliance assurance meeting ASME B18.2.1, SAE J429, RoHS 3, and REACH standards for global industrial use

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers critical engineering solutions for industrial assembly challenges where vibration resistance and structural integrity are paramount. The 3/8"-24 UNF fine threading provides superior holding power in materials prone to stripping, while the partially threaded design concentrates clamping force precisely where needed. The zinc plated steel construction addresses corrosion concerns in manufacturing environments, extending maintenance intervals. With 120,000 psi tensile strength and Rockwell C25 hardness, these hex head screws maintain performance in heavy machinery, structural frameworks, and automotive applications where reliability cannot be compromised. The external hex drive ensures straightforward installation even in confined spaces.

Specification Summary & Compliance

Manufactured to precise Class 2A thread fit tolerances with 3/8"-24 UNF fine threading and right-hand thread direction. The fastener meets ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and performance. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental responsibility and global market acceptance. The 2 3/4" length with 1" minimum thread length provides versatile application coverage while maintaining structural integrity throughout the fastener.