S-91236A860 3/4"-10 x 6 1/2" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating, extending service life in harsh industrial environments
• High tensile strength of 60,000 PSI ensures reliable performance under heavy loads and vibration
• Coarse UNC threading provides faster assembly and reduced cross-threading risk compared to fine threads
• Class 2A thread fit guarantees consistent, secure fastening with standard nuts and tapped holes
• External hex drive design allows for high-torque installation using common wrench tools
• Partial threading configuration optimizes grip length while minimizing material usage
• Rockwell B69 hardness rating maintains thread integrity and prevents stripping during repeated use

Professional Applications & Engineering Value

This heavy-duty hex head screw addresses critical challenges in structural assembly and machinery maintenance. The steel construction with zinc plating creates a barrier against oxidation in outdoor or high-moisture applications, while the 3/4"-10 UNC coarse thread profile ensures rapid installation in structural steel, equipment bases, and construction frameworks. Engineers specify this partially threaded fastener for applications requiring precise clamp load distribution, where the unthreaded shank section provides enhanced shear resistance. The external hex drive accommodates high installation torque without cam-out risks, making it ideal for bolted connections in manufacturing plants, infrastructure projects, and heavy equipment where 60,000 PSI tensile strength is mandatory for safety-critical joints.

Specification Summary & Compliance

Manufactured to ASME B18.2.1 dimensional standards with ASTM A307 material composition, this hex head screw maintains Class 2A thread tolerances for consistent fit with standard components. The 6 1/2" length with 2" minimum thread length provides versatile fastening solutions. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental responsibility and workplace safety standards are met for global industrial supply chains.