S-91251A690 7/16"-14 x 6" ASTM A574 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 from the black-oxide finish extends service life in harsh industrial environments, minimizing maintenance and replacement costs.
• Precise Class 3A thread fit guarantees secure, vibration-resistant assemblies with consistent clamping force and reduced loosening over time.
• High hardness (Rockwell C37) provides excellent wear resistance, maintaining thread integrity and drive features through repeated use.
• Coarse UNC threads enable faster installation and are less prone to clogging in dirty or debris-filled applications, improving assembly efficiency.
• Partially threaded design allows for precise clamping on specific sections, ideal for components requiring controlled grip length.
• Standard hex socket drive offers high torque capability and easy access in confined spaces, streamlining maintenance and disassembly.

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these Black-Oxide Alloy Steel Socket Head Cap Screws deliver exceptional reliability in heavy machinery, automotive assemblies, and construction equipment. The 7/16"-14 UNC coarse thread combined with a Class 3A thread fit ensures vibration resistance and consistent preload, addressing common issues of joint loosening under dynamic loads. The black-oxide surface treatment provides a durable barrier against moisture and chemicals, significantly enhancing corrosion resistance without compromising the 170,000 psi tensile strength. This makes them ideal for applications requiring both high mechanical performance and long-term durability, such as precision manufacturing jigs, hydraulic systems, and structural frameworks where fastener failure is not an option.

Specification Summary & Compliance

This 6" length screw features a 7/16"-14 UNC coarse thread with Class 3A precision fit and a minimum thread length of 1 3/8". Manufactured to ASTM A574 specifications, it ensures consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting environmental and safety standards for industrial use worldwide.