S-90729A512 5/16"-18 x 1" Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh chemical and marine environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for heavy-duty applications
• Precision thread engagement through Class 3A thread fit ensuring reliable, vibration-resistant connections
• Enhanced durability with passivated finish providing additional corrosion protection and extended service life
• Optimized installation efficiency with 5/32" hex drive and undercut flat head design for flush mounting and reduced installation torque
• Reliable performance in demanding conditions through coarse UNC threading offering superior resistance to loosening under stress
• Full regulatory compliance meeting RoHS 3 and REACH standards for environmentally responsible manufacturing

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 316 stainless steel flat head screws deliver exceptional performance where corrosion resistance and mechanical integrity are critical. The passivated finish provides an additional protective layer against chemical attack, making them ideal for marine equipment, chemical processing plants, and food processing machinery. The Class 3A thread fit ensures precise engagement with mating components, reducing the risk of vibration-induced loosening in high-stress environments. With coarse UNC threading and undercut flat head profile, these screws offer superior clamping force distribution and flush mounting capabilities for applications requiring smooth surface finishes. The combination of 70,000 psi tensile strength and Rockwell B70 hardness provides reliable performance in structural assemblies and heavy machinery where fastener failure is not an option.

Specification Summary & Compliance

This 5/16"-18 UNC flat head screw features precision Class 3A thread fit with right-hand coarse threading, ensuring exact dimensional accuracy per inch fastening standards. Manufacturing specifications include a head diameter tolerance of -0.01" to 0", 100° countersink angle, and fully threaded 1" length. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting the latest environmental and safety standards for industrial fasteners.