S-90631A112 M4 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance with nylon insert locking technology, maintaining secure fastening even under continuous motion and shock loads
• Enhanced durability in moderate heat environments, with nylon insert performing reliably up to 220°F (105°C) without compromising locking function
• Excellent corrosion protection through zinc-plated steel construction, extending service life in humid or outdoor industrial settings
• Precision thread engagement with Class 6H fit ensuring consistent clamping force and reducing risk of cross-threading during installation
• Quick installation and removal with standard external hex drive profile compatible with common metric wrenches and sockets
• Reliable performance in coarse thread applications with M4x0.7mm configuration providing strong holding power in softer materials
• Compliance with international environmental standards including RoHS 3 and REACH, ensuring safe use across global manufacturing sectors

Professional Applications & Engineering Value

This M4 nylon insert locknut delivers critical vibration-resistant performance in demanding industrial applications where loosening under dynamic loads poses significant safety risks. The zinc-plated steel construction provides essential corrosion protection for machinery operating in challenging environments, while the nylon insert locking mechanism creates consistent friction against the mating bolt thread, effectively dampening vibrations in automotive assemblies, conveyor systems, and electrical enclosures. With its metric coarse thread profile and Class 6H precision tolerance, this locknut ensures reliable fastening in sheet metal, plastic components, and structural frameworks where vibration-induced failure must be prevented. The 220°F temperature rating makes it suitable for engine compartments, motor mounts, and industrial equipment experiencing moderate thermal cycling.

Specification Summary & Compliance

This M4 x 0.7mm locknut features Class 6H thread fit per ISO metric standards, ensuring precise dimensional accuracy and consistent performance. The external hex drive (7mm width, 5mm height) conforms to standard wrenching specifications for reliable installation. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental directives, confirming absence of restricted hazardous substances. The nylon insert locking mechanism meets industry standards for vibration-resistant fasteners, providing maintained clamping force under dynamic loading conditions.