S-91412A340 5/16"-18 x 1" Stainless Steel Thread-Locking Hex Head Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with nylon patch ensures secure assemblies even under dynamic loads
• Exceptional corrosion resistance from 18-8 stainless steel construction for long service life in harsh environments
• High-strength performance with 70,000 psi tensile strength withstands demanding mechanical stresses
• Wide temperature compatibility (-55° to 250°F) maintains locking integrity across industrial operating conditions
• Precise thread engagement with Class 2A fit enables smooth installation and reliable connections
• Optimized drive efficiency through external hex design for high-torque applications
• Full threading coverage provides maximum grip length and load distribution

Professional Applications & Engineering Value

These 5/16"-18 UNC hex head screws deliver critical vibration resistance where conventional fasteners fail. The nylon patch locking technology creates permanent friction against loosening from machinery vibrations, while the 18-8 stainless steel composition resists chemical corrosion in manufacturing, marine, and outdoor applications. With coarse threading and Class 2A thread fit, installation remains swift and reliable even in high-volume assembly lines. The combination of 70,000 psi tensile strength and Rockwell B70 hardness ensures structural integrity in heavy equipment, transportation systems, and industrial machinery where fastener failure isn't an option.

Specification Summary & Compliance

Manufactured to precise UNC coarse thread standards with Class 2A thread fit for consistent engagement. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Thread locking performance maintained across -55° to 250°F temperature range. All dimensions conform to inch system specifications including 1/2" head width and 1" length with full threading.