NSN 2640-01-419-6200: Runflat Lubricant Complete Guide
Posted July 21, 2026
What Is Runflat Lubricant?
Runflat lubricant is a specialized compound applied inside the tire cavity before a runflat insert is installed. Its primary function is to reduce friction between the inner surface of the tire and the runflat insert during deflated operation. When a military vehicle loses tire pressure and continues driving, the runflat insert bears the vehicle's weight while the tire rotates around it. Without proper lubrication, the friction-generated heat can degrade the insert, damage the tire, and shorten the safe operating distance. The lubricant creates a low-friction interface that allows the tire to slide smoothly over the insert, extending run-flat range and protecting both components.
NSN 2640-01-419-6200 Specifications
NSN 2640-01-419-6200 is the National Stock Number assigned to the 11.5 fluid ounce (FL OZ) tube of runflat lubricant. This is the standard individual-service unit, sized for a single tire assembly. The lubricant is formulated to meet military performance requirements for temperature stability, friction reduction, and material compatibility. It is compatible with both polymer (static) and composite (dynamic) runflat inserts, as well as all standard military tire compounds. The product is shelf-stable under normal storage conditions and requires no special handling or hazardous material protocols.
NSN 2640-01-457-5552: Bulk Packaging
For depot-level maintenance operations and high-volume assembly lines, the same lubricant formulation is also available under NSN 2640-01-457-5552 in a 55-gallon drum. This bulk format is ideal for maintenance facilities that process large numbers of wheel assemblies and need an efficient, cost-effective supply. Both NSNs reference the same MIL-STD-compliant lubricant; the only difference is the packaging format. Procurement officers can order either NSN through the DLA supply chain depending on their operational scale.
Proper Application Procedure
Correct application of runflat lubricant is essential to achieving the full 30-plus-mile run-flat capability. The lubricant should be applied evenly to the inner crown of the tire — the area where the runflat insert will make contact during deflated operation. For the 11.5 FL OZ tube, the entire contents are typically used for one tire assembly. The lubricant is squeezed directly into the tire cavity before the runflat insert is positioned and the tire is mounted onto the wheel. Even coverage is important; concentrated application in one area can lead to uneven friction distribution and premature wear during a run-flat event.
Compatibility Across Runflat Systems
This lubricant is engineered to work with all major runflat insert types. Whether your fleet uses polymer runflats with multi-piece wheels or composite runflats with single-piece wheels, the lubricant formulation is compatible. It does not degrade rubber compounds, corrode metal wheel surfaces, or break down under the high temperatures generated during extended deflated driving. This universal compatibility simplifies logistics — maintenance units only need to stock one lubricant NSN regardless of the mix of runflat types in their vehicle fleet.
Procurement Through DLA
Both NSN 2640-01-419-6200 and NSN 2640-01-457-5552 are available through the Defense Logistics Agency supply chain. The Toota Group LLC, operating under CAGE code 93ST9, distributes runflat lubricant manufactured by RunFlat International. Government procurement officers can source these NSNs through DIBBS, and FMS customers can order through established foreign military sales channels. For technical questions about lubricant application or compatibility with specific runflat assemblies, contact The Toota Group directly.