S-91247A805 5/8"-11 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 load-bearing capability with Grade 5 classification and 120,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance through zinc plating, extending service life in harsh industrial environments
• Optimized thread engagement with UNC coarse threading and Class 2A fit ensuring secure fastening and vibration resistance
• Enhanced installation efficiency featuring external hex drive and standard 15/16" head width for straightforward torque application
• Controlled partial threading (1½" min thread length) providing precise clamping force distribution across connected materials
• Consistent mechanical properties with Rockwell C25 hardness maintaining dimensional stability under stress
• Regulatory compliance assurance meeting ASME B18.2.1 and SAE J429 specifications for quality and interoperability

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers critical engineering solutions for heavy machinery, structural steel connections, and industrial equipment assembly. The zinc plated steel construction combats environmental degradation while the 5/8"-11 UNC coarse thread design prevents cross-threading during high-speed installation. With partial threading optimizing grip range, this fastener eliminates joint slippage in dynamic load conditions. The external hex drive accommodates standard wrenching tools, reducing installation time in confined spaces. Engineers specify this heavy-duty hex screw for applications requiring predictable clamp load maintenance and vibration resistance, from construction frameworks to manufacturing equipment where 120,000 psi tensile strength ensures structural integrity under cyclic loading.

Specification Summary & Compliance

Manufactured to Class 2A thread fit tolerances per UNC standards, this fastener guarantees interchangeability with matching components. The 2¾" length with controlled partial threading maintains dimensional accuracy across production batches. Compliance with ASME B18.2.1 and SAE J429 specifications validates mechanical properties and dimensional consistency. Environmental regulations adherence includes RoHS 3 (2015/863/EU) restriction compliance and REACH (EC 1907/2006) substance registration, ensuring global market suitability for environmentally conscious procurement.