S-90778A119 4-40 x 3/8" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial environments and chemical exposure
• Precise thread engagement with Class 3A fit for reliable, vibration-resistant fastening in demanding applications
• Enhanced torque transmission through the 0.050" hex drive, preventing tool slippage and ensuring secure installation
• Maximum holding power with the 90° cone point design that bites into surfaces for permanent component positioning
• Optimized durability with Rockwell B80 hardness, providing excellent mechanical strength and wear resistance
• Industry-standard compatibility with UNC coarse threading (4-40) for easy installation and replacement across equipment
• Environmental compliance assurance meeting RoHS 3 and REACH regulations for safe use in regulated industries

Professional Applications & Engineering Value

This 316 stainless steel set screw delivers exceptional performance in corrosive and high-stress environments where component security is critical. The UNC coarse thread design ensures rapid installation and superior resistance to vibrational loosening in machinery, automotive, and marine applications. With its 90° cone point, it provides concentrated clamping force that prevents shaft slippage in pulleys, gears, and collars. The hex headless configuration allows for flush mounting in space-constrained assemblies while maintaining full torque capability. Manufactured to ASME B18.3 specifications, this set screw offers reliable dimensional consistency for precision engineering applications requiring repeated disassembly and reassembly cycles.

Specification Summary & Compliance

This set screw features precise Class 3A thread fit with 4-40 UNC coarse threading, ensuring tight tolerances for secure fastening. The 3/8" length and 0.112" thread diameter provide optimal engagement depth for various assembly requirements. Manufacturing complies with ASME B18.3 standards for dimensional accuracy and performance. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental regulations for hazardous substance restrictions.