S-91309A839 3/4"-10 x 1 1/2" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 60,000 PSI ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior corrosion resistance from zinc plating extends service life and maintains integrity in harsh industrial environments.
• Class 2A thread fit provides consistent, easy assembly and disassembly, minimizing installation time and labor costs.
• Coarse UNC threading offers excellent grip and vibration resistance, ideal for heavy machinery and structural applications.
• Full threading along the 1 1/2" length allows for maximum adjustability and secure fastening across various material thicknesses.
• External hex drive with 1 1/8" head width enables high-torque installation using standard tools, enhancing efficiency and grip.
• Rockwell B69 hardness ensures durability and resistance to wear, supporting long-term operational reliability.

Professional Applications & Engineering Value

This 3/4"-10 UNC hex head screw is engineered to address critical challenges in industrial assembly, where vibration, heavy loads, and environmental factors can compromise joint integrity. Constructed from high-strength steel and finished with a zinc plating, it combats corrosion effectively, making it suitable for outdoor equipment, construction frameworks, and machinery subjected to moisture or chemicals. The coarse thread spacing and Class 2A thread fit simplify alignment and reduce the risk of cross-threading, while the external hex drive allows for quick, high-torque fastening with common wrenches. Ideal for applications in manufacturing, automotive, and infrastructure, this fastener ensures stable connections that withstand dynamic stresses, minimizing maintenance downtime and enhancing overall system safety.

Specification Summary & Compliance

This product adheres to precise dimensional standards, including a Class 2A thread fit for consistent tolerance and UNC coarse thread type with a size of 3/4"-10. It meets ASME B18.2.1 specifications under ASTM A307 for material quality, ensuring reliable performance in general-purpose applications. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental responsibility in industrial use.