S-91257A862 3/4"-10 x 7 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional strength and durability with Grade 8 classification, 150,000 psi tensile strength, and Rockwell C33 hardness for reliable performance in demanding applications
• Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh industrial environments
• Optimized thread engagement with 3/4"-10 UNC coarse thread design and Class 2A fit ensuring secure fastening and vibration resistance
• Easy installation and removal through external hex drive and 1 1/8" head width for standard tool compatibility and high torque application
• Versatile partial threading allowing unthreaded shank section for precise clamping and shear strength requirements
• Industry standard compliance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed interchangeability and performance
• Environmental regulation compliance with RoHS 3 and REACH standards for safe use across global industrial markets

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers critical engineering solutions for heavy machinery, structural steel connections, and industrial equipment assembly. The zinc yellow-chromate plated steel construction provides essential corrosion protection in manufacturing plants, outdoor installations, and high-humidity environments. The 3/4"-10 UNC coarse thread with Class 2A fit ensures rapid installation and maintains clamping force under dynamic loads and vibration. The partially threaded design offers precise bearing surface control while the external hex drive accommodates high torque requirements. These heavy-duty fasteners solve critical challenges in construction, automotive, and industrial maintenance where failure prevention and long-term reliability are paramount.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit and UNC coarse thread specifications. Complies with ASME B18.2.1 and SAE J429 manufacturing standards for Grade 8 fasteners. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) standards for hazardous substance restrictions. The 7 1/2" length with 2" minimum thread length provides optimal engagement for structural applications.