The NAS516-1A is an aerospace-standard steel lubrication fitting (grease fitting / zerk fitting type) used to provide a controlled entry point for grease or lubricant into aircraft mechanical assemblies. It allows maintenance personnel to lubricate moving components such as bearings, linkages, hinges, and control system joints without disassembly.

This fitting is designed to maintain proper lubrication of high-wear components, reducing friction, preventing corrosion, and extending service life. It is commonly installed in airframe, landing gear, and control surface mechanisms where periodic lubrication is required for safe operation.

Manufactured to NAS specifications, the NAS516-1A is typically made from high-strength steel with a corrosion-resistant finish, ensuring durability under vibration, pressure, and environmental exposure in aviation service conditions.

Key features include:

NAS516-1A aerospace lubrication (grease) fitting
Provides controlled access for grease application
Used in airframe and mechanical moving assemblies
Supports bearings, hinges, and linkage lubrication
High-strength steel construction
Corrosion-resistant aviation-grade finish
Designed for repeated maintenance use
Reduces wear and friction in moving parts
Suitable for vibration and cyclic load environments
Direct replacement per NAS maintenance standards