S-90729A514 5/16"-18 x 1 1/4" Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction and passivated finish for extended service life in harsh environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for reliable performance under heavy loads
• Precision thread engagement through Class 3A fit and UNC coarse threading ensures secure fastening and vibration resistance
• Optimized flush mounting with 100° countersink angle and undercut flat head design for seamless surface integration
• Enhanced installation efficiency with hex drive (5/32") providing superior torque transmission and reduced slipping
• Full-threaded design maximizes grip length and load distribution across the entire fastener
• Regulatory compliance with RoHS 3 and REACH standards ensures environmental safety and industrial acceptability

Professional Applications & Engineering Value

These 316 stainless steel flat head screws deliver critical performance advantages in demanding industrial environments where corrosion resistance and mechanical reliability are paramount. The combination of UNC coarse threading and Class 3A thread fit provides excellent vibration resistance in machinery, automotive, and marine applications, while the passivated finish enhances the natural corrosion resistance of 316 stainless steel for extended service in chemical processing and coastal installations. The undercut flat head profile with 100° countersink angle ensures flush mounting in precision assemblies, eliminating protrusions that could interfere with moving components. With fully threaded construction and hex drive compatibility, these screws offer simplified installation and maximum clamping force distribution for structural applications requiring consistent performance under stress.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit and UNC coarse threading (5/16"-18) ensuring interchangeability and reliable performance. The screws feature tight head diameter tolerance (-0.01" to 0") and are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Mechanical properties include 70,000 psi tensile strength and Rockwell B70 hardness, confirming consistent quality and reliability for industrial applications requiring certified materials and manufacturing standards.