S-91833A142 4-40 Thumb Nuts

Key Features & Benefits at a Glance

• Superior hand-tightening capability with deep knurling for secure grip without tools, reducing assembly time
• Excellent corrosion resistance from 18-8 Stainless Steel material, ensuring longevity in harsh environments
• Reliable thread engagement with fully threaded UNC coarse threads for quick installation and vibration resistance
• Precise Class 2B thread fit for smooth mating with standard male threads, minimizing cross-threading risks
• Durable round head design with 3/4" diameter and standard profile for comfortable manual operation
• Stable collar construction featuring 1/4" diameter and 1/2" height for enhanced load distribution
• Environmental compliance assurance meeting RoHS 3 and REACH standards for safe industrial usage

Professional Applications & Engineering Value

This 4-40 UNC thumb nut delivers exceptional value in applications requiring frequent adjustments or tool-free maintenance. The 18-8 Stainless Steel construction resists rust and chemical exposure, making it ideal for electrical enclosures, machinery guards, and outdoor equipment. The deep knurled texture provides positive grip even with oily hands or gloves, while the coarse UNC threading ensures rapid installation in production environments. Engineers specify this component for industrial assembly lines, test fixtures, and access panels where quick disassembly is critical. The fully threaded design maintains consistent clamping force across the entire 5/8" height, preventing loosening under vibration.

Specification Summary & Compliance

Manufactured to standard thumb nut profile with round head shape and right-hand thread direction. Thread specifications include 4-40 UNC coarse thread with Class 2B fit for precise dimensional accuracy. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations regarding hazardous substances. Collar dimensions maintained at 1/4" diameter × 1/2" height with 3/4" head diameter for optimal performance.