S-91247A651 3/8"-16 x 7 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 120,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance through zinc plating that protects against environmental degradation
• Optimized thread engagement with UNC coarse threading providing faster assembly and superior vibration resistance
• Precise mechanical properties with Rockwell C25 hardness ensuring consistent performance and durability
• Secure fastening capability through Class 2A thread fit maintaining proper clearances for reliable installations
• Enhanced torque transmission via external hex drive design allowing for high tightening forces
• Versatile partial threading enabling both clamping and alignment functions in various assembly scenarios

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers critical engineering solutions for industrial applications where structural integrity is paramount. The zinc plated steel construction provides essential corrosion protection in manufacturing environments, while the 3/8"-16 UNC coarse thread design ensures rapid installation and superior resistance to vibrational loosening in machinery and equipment. The partially threaded configuration offers dual functionality - the threaded portion secures components while the unthreaded shank provides precise alignment and shear strength. With external hex drive compatibility, these fasteners accommodate high-torque applications in construction, automotive assembly, and heavy equipment manufacturing, making them ideal for structural connections requiring 120,000 psi tensile strength and reliable performance under sustained loads.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerances ensuring proper clearances for reliable assembly. The fastener meets ASME B18.2.1 and SAE J429 specifications for Grade 5 hex head screws, guaranteeing consistent mechanical properties and dimensional accuracy. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industries. The inch system measurements maintain compatibility with North American industrial standards while the right-hand thread direction and coarse thread spacing provide optimal performance in general-purpose applications.