S-92620A329 1 1/4"-7 x 4 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capability with Grade 8 classification and 150,000 psi tensile strength for reliable performance in high-stress applications
• Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in demanding industrial environments
• Optimized thread engagement through UNC coarse threading and Class 2A fit, ensuring secure fastening and reduced cross-threading risk
• Enhanced installation efficiency with external hex drive and 1 7/8" head width, allowing for high torque application using standard tools
• Strategic partial threading design that concentrates strength where needed while facilitating precise clamping force distribution
• Rigorous quality assurance through compliance with ASME B18.2.1 and SAE J429 standards, guaranteeing dimensional accuracy and performance consistency
• Environmental responsibility with RoHS 3 and REACH compliance, ensuring safe use across regulated industrial sectors

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers critical engineering solutions for heavy machinery, structural assemblies, and industrial equipment where high tensile strength and vibration resistance are paramount. The steel construction with Rockwell C33 hardness maintains integrity under extreme loads, while the zinc yellow-chromate plating provides durable protection against corrosion in harsh operating environments. The 1-1/4"-7 UNC coarse thread configuration ensures rapid installation and reliable grip in various materials, and the partial threading design optimizes stress distribution. These industrial fasteners are engineered to prevent joint failure in applications requiring 150,000 psi tensile strength, making them ideal for construction, manufacturing, and heavy equipment maintenance where safety and durability are non-negotiable.

Specification Summary & Compliance

This hex head screw features precise Class 2A thread fit tolerances with 1-1/4"-7 UNC coarse threading and 4-1/2" length. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for safe industrial use.