S-90729A415 1/4"-20 x 1 1/2" Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction and passivated finish, ideal for harsh environments
• Exceptional thread reliability with Class 3A fit ensuring precise, vibration-resistant fastening in critical assemblies
• High mechanical strength offering 70,000 psi tensile strength and Rockwell B70 hardness for heavy-duty applications
• Flush, secure mounting with 100° countersink angle and undercut flat head design for smooth surface finishes
• Efficient installation using standard 1/8" hex drive for quick, tool-compatible fastening
• Full thread engagement along the 1-1/2" length for maximum grip and load distribution
• Compliance with global standards including RoHS 3 and REACH for safe, regulated use in international markets

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these 1/4-20 UNC flat head screws in 316 Stainless Steel address common challenges like corrosion in chemical processing, marine, or outdoor equipment. The Class 3A thread fit and coarse threading provide superior resistance to loosening under vibration, critical in machinery and automotive assemblies. With a passivated finish enhancing durability, the undercut flat head and 100° countersink angle ensure a flush fit, preventing snagging and improving aerodynamics in enclosures or panels. These screws deliver reliable performance where high tensile strength and regulatory compliance are non-negotiable.

Specification Summary & Compliance

This product adheres to UNC coarse thread standards with precise Class 3A thread fit for tight tolerances. Dimensions include a 1/4"-20 thread size, 1-1/2" length, and head diameter of 0.531" within a -0.01" to 0" tolerance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are met for industrial use.