S-91247A849 3/4"-10 x 3 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior tensile strength of 120,000 PSI ensures reliable performance in demanding applications, reducing the risk of fastener failure
• Zinc plating provides excellent corrosion resistance, extending service life in harsh industrial environments
• Grade 5 steel construction with Rockwell C25 hardness offers optimal durability and resistance to wear
• UNC coarse threading enables faster installation and better performance in softer materials or where vibration is a concern
• Partially threaded design allows for precise clamping force control and secure fastening in heavy-duty assemblies
• Class 2A thread fit ensures smooth assembly and consistent performance with standard nuts
• External hex drive with 1 1/8" head width provides excellent torque transmission and easy installation with common tools

Professional Applications & Engineering Value

These Grade 5 hex head screws deliver exceptional engineering value in heavy-duty applications where reliability is paramount. The 3/4"-10 UNC coarse thread configuration provides superior holding power in structural steel, machinery frames, and construction equipment. The zinc plated steel construction addresses corrosion concerns in industrial environments, while the partially threaded design ensures optimal clamp load distribution. With 120,000 PSI tensile strength and Rockwell C25 hardness, these fasteners withstand extreme loads and vibration, making them ideal for automotive, manufacturing, and infrastructure projects where failure is not an option.

Specification Summary & Compliance

This 3/4"-10 hex head screw features Class 2A thread fit per UNC standards with precise dimensional accuracy. Manufactured to ASME B18.2.1 specifications and SAE J429 Grade 5 requirements, ensuring consistent quality and performance. The fastener is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental regulations for industrial use. With a length of 3 1/2" and minimum thread length of 1 3/4", it provides reliable fastening solutions for professional applications.