LEE PLUG EXPANSION PLUGS
Lee Plug® expansion plugs seal fluid passages leak-tight, without the use of O-rings, threads, or sealants. It is simple the most successful method of sealing drilled holes in critical applications. Well over 100 million Lee Plugs have been used on aircraft, missiles, spacecraft, and other sophisticated hydraulic systems that require a permanent leak-tight seal. Learn how the Lee Plug works.
Available Designs
Lee Plug expansion plugs are available in three versions:
- The original Lee Plug is available in short and long version in a range of English sizes from 0.093" dia. To 0.656" dia., and in metric sizes from 2.5mm to 8.0mm. A variety of standard material combinations are available.
- The High-Strength Lee Plug is specifically designed for high-pressure systems and has been optimized for use in high-strength/high-hardness materials, such as the precipitation hardenable steels titanium.
- Lee Plug RFO® (Radial Force Only)
The Lee Plug RFO is designed to seal holes in thin walls or fragile materials. Designed to be easily removable, the plug does not require a support shoulder and the installation system assures that no downward pressure is applied to the product.
In addition to our expansion plug family, Lee offers A.F.O. plugs for higher pressures up to 56,000 psi.
- A.F.O. (Axial Force Only) Lee Plugs provide a leak-tight, metal-to-metal seal in higher-pressure/high-temperature manifold applications. Designed to be both removable and reusable, the plugs feature a unique floating seal that self-aligns to prevent galling.