The MS29513-215 is a military-standard nitrile (NBR) O-ring / preformed packing element used for sealing in aircraft fuel, oil, and hydraulic systems. It is part of the MS29513 series, designed for hydrocarbon-resistant applications where reliable sealing under pressure and temperature variation is required.

This specific size is commonly used in aerospace fluid fittings, valves, and accessory housings, where it prevents leakage between mating metal components. It is made from fuel-resistant nitrile rubber and is designed to maintain elasticity and sealing performance in aviation-grade hydrocarbons and lubricants.

The part is defined by strict dimensional tolerances and is interchangeable across multiple OEM aerospace applications that follow MS29513 standard specifications.

Key features include:

Proponent part number: MS29513-215
Military standard O-ring (MS29513 series)
Material: Nitrile rubber (NBR), hydrocarbon resistant
Inner diameter: 1.040" – 1.052"
Cross-section thickness: ~0.135" – 0.143"
Designed for fuel, oil, and hydraulic sealing applications
Used in aerospace fluid system fittings and housings
High resistance to aviation hydrocarbons and lubricants
Standardized military specification (interchangeable across OEMs)
Suitable for static and dynamic sealing applications
Commonly used in aircraft maintenance and overhaul assemblies