S-98520A140 5/16"-18 Thumb Nuts

Key Features & Benefits at a Glance

• Superior vibration resistance through the nylon insert locking mechanism, preventing loosening in high-motion environments
• High-temperature durability with a maximum operating temperature of 225°F, suitable for demanding industrial conditions
• Easy manual installation and removal thanks to the 1 1/2" wide wing design, eliminating the need for tools
• Reliable thread engagement with Class 2B thread fit ensuring consistent performance and reduced cross-threading risk
• Corrosion-resistant construction from zinc alloy material, providing long service life in various environments
• Wide compatibility with UNC coarse 5/16"-18 threads, matching standard industrial components
• Secure fastening grip from the 9/16" base diameter, offering stable mounting surface for repeated adjustments

Professional Applications & Engineering Value

This nylon insert thumb locknut delivers critical vibration-proof performance for machinery, equipment, and assembly lines where constant motion threatens fastener integrity. The zinc alloy construction resists corrosion in industrial atmospheres, while the UNC coarse thread design enables quick installation and high torque resistance. Engineers specify this wing thumb nut for applications requiring frequent manual adjustments—from conveyor systems to electrical enclosures—where tool-free access and reliable locking are paramount. The 9/16" base diameter provides substantial bearing surface, distributing clamp load effectively to prevent damage to connected materials.

Specification Summary & Compliance

Manufactured to precise Class 2B thread fit standards with UNC 5/16"-18 coarse threads and right-hand thread direction. Complies with industry threading specifications and features a nylon insert rated for continuous service up to 225°F. The zinc alloy material meets RoHS and REACH environmental compliance requirements for industrial components.