S-91286A212 3/8"-16 x 2 5/8" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum load-bearing capability with 150,000 psi tensile strength and Grade 8 classification for critical structural applications
• Superior corrosion protection through zinc-flake coating that withstands harsh industrial environments
• Enhanced installation efficiency with external hex drive design providing secure tool engagement and high torque transmission
• Reliable thread performance featuring UNC coarse threads with Class 2A fit for consistent engagement and vibration resistance
• Optimized strength-to-weight ratio through Rockwell C33 hardness rating ensuring durability without brittleness
• Versatile partial threading allowing for both clamping and alignment functions in diverse assembly scenarios
• Regulatory compliance assurance meeting ASME B18.2.1, SAE J429 standards plus RoHS 3 and REACH environmental directives

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver exceptional engineering value in heavy machinery, construction equipment, and industrial assembly applications where failure is not an option. The 3/8"-16 UNC coarse thread configuration provides superior resistance to vibration loosening while maintaining quick installation times. The zinc-flake coating offers multi-layer corrosion protection that significantly outperforms conventional zinc plating in challenging environments. With partial threading and 2 5/8" length, these fasteners provide optimal shear strength in bolted joints while allowing for precise adjustment in structural connections. The external hex drive ensures maximum torque application without cam-out issues, making them ideal for high-stress applications requiring reliable, repeatable fastening performance.

Specification Summary & Compliance

Manufactured to exacting Class 2A thread fit tolerances with UNC coarse thread profile ensuring consistent engagement across mating components. Complies with ASME B18.2.1 dimensional specifications and SAE J429 material standards for Grade 8 fasteners. Meets environmental compliance requirements including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations. The zinc-flake coated surface treatment provides superior corrosion resistance while maintaining dimensional integrity for reliable performance in demanding industrial applications.