S-91274A193 3/4"-10 x 2" ASME B18.3, ASTM A574, ASTM B117 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under extreme loads, reducing the risk of fastener failure in critical applications.
• Superior corrosion resistance provided by the zinc-flake coating, extending service life in harsh industrial environments and minimizing maintenance needs.
• Precision Class 3A thread fit guarantees secure, vibration-resistant assemblies with consistent clamping force and reduced loosening over time.
• High hardness (Rockwell C37) enhances wear resistance and durability, maintaining thread integrity through repeated installation and removal cycles.
• Heavy-duty hex drive (5/8") allows for high-torque installation with standard tools, improving assembly efficiency and reducing stripping risks.
• Full threading along the 2" length offers versatile positioning and uniform stress distribution, accommodating various material thicknesses.
• Compliance with major standards including ASME B18.3 and ASTM A574 ensures dimensional accuracy, material consistency, and interoperability with existing UNC coarse-thread systems.

Professional Applications & Engineering Value

This zinc-flake-coated alloy steel socket head cap screw is engineered to address common industrial challenges such as joint failure under dynamic loads and corrosion-induced degradation. Its high tensile strength (170,000 psi) and Class 3A UNC coarse threads provide exceptional clamping force and vibration resistance, making it ideal for heavy machinery, automotive assemblies, and structural frameworks where reliability is paramount. The zinc-flake coating offers robust protection against rust and chemical exposure, significantly extending service life in demanding environments like outdoor equipment or marine applications. By combining precise socket head design with full threading, it ensures easy installation in confined spaces and uniform load distribution, reducing stress concentrations and preventing premature wear in high-cycle operations.

Specification Summary & Compliance

This socket head cap screw features a 3/4"-10 UNC coarse thread with Class 3A fit for tight tolerances and secure fastening. It meets ASME B18.3 for dimensional standards, ASTM A574 for material quality, and ASTM B117 for corrosion testing. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industries.