S-95150A121 4-40 Thumb Nuts

Key Features & Benefits at a Glance

• Enhanced manual grip with knurled round head design for easy hand-tightening without tools
• Superior corrosion resistance with 18-8 stainless steel construction for long-term durability in harsh environments
• Secure flange seating with 1/4" collar diameter providing stable contact surface and vibration resistance
• Reliable coarse threading with 4-40 UNC specification for quick assembly and disassembly operations
• Precision thread engagement with Class 2B fit ensuring consistent performance and reduced cross-threading risk
• Optimized partial threading allowing for maximum thread depth engagement while maintaining structural integrity
• Full regulatory compliance meeting RoHS 3 and REACH standards for global industrial applications

Professional Applications & Engineering Value

This 18-8 stainless steel flanged thumb nut delivers exceptional value in applications requiring frequent adjustments or tool-less maintenance. The knurled round head provides superior tactile grip even with gloved hands, while the flange design distributes clamping force evenly, preventing surface damage and maintaining joint integrity. The 4-40 UNC coarse thread configuration ensures rapid installation in machinery, electronic enclosures, and assembly fixtures where corrosion resistance is critical. The partial threading and Class 2B thread fit provide optimal engagement depth while minimizing the risk of cross-threading during repeated use, making it ideal for production environments requiring both speed and reliability.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2B thread fit and UNC coarse thread specifications (4-40). Features include 1/4" collar diameter, 5/16" head diameter, and 7/32" thread depth with right-hand threading. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and material safety for industrial applications worldwide.