S-98520A129 1/4"-28 Thumb Nuts

Key Features & Benefits at a Glance

• Secure vibration-resistant locking with a nylon insert that maintains grip under dynamic loads, preventing loosening in high-motion applications
• High-temperature performance up to 225°F ensures reliable operation in warm environments without compromising the locking mechanism
• Tool-free installation and adjustment via the wing-shaped head design, enabling quick assembly and disassembly without wrenches
• Precise Class 2B thread fit guarantees smooth engagement with mating components, reducing cross-threading risks
• Durable zinc alloy construction provides excellent corrosion resistance for extended service life in industrial settings
• 1 1/4" width for enhanced grip allows for comfortable hand-tightening even with gloves, improving operator efficiency
• Fine UNF 1/4"-28 threads deliver superior holding power and finer adjustment control compared to coarse threads

Professional Applications & Engineering Value

This nylon insert locking thumb nut solves critical challenges in machinery, electronics, and automotive assemblies where vibration resistance and frequent manual adjustments are paramount. The zinc alloy body withstands harsh conditions while the standard wing profile ensures consistent torque application by hand. Engineers value the fine UNF threads and Class 2B fit for precision alignment in calibration equipment, access panels, and temporary fixtures. The 225°F-rated nylon insert maintains locking force in elevated temperatures, preventing downtime in industrial ovens, motor mounts, and power transmission systems. Its 7/16" base diameter provides stable seating on surfaces, making it ideal for tool-less fastening in maintenance-heavy environments.

Specification Summary & Compliance

Manufactured to UNF thread standards with Class 2B thread fit for consistent compatibility. The right-hand fine threads (1/4"-28) ensure precise engagement, while the standard wing nut profile guarantees interchangeability. Complies with industry manufacturing specifications for dimensional accuracy. Materials and finishes meet RoHS and REACH environmental standards for safe industrial use.