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Engineering

Lee Plugs

Proof Pressures up to 32,000 psid
Sizes from Ų0.093" to Ų0.656"
Aluminum, Stainless Steel Monel Models Available
High Pressure Plugs Available
Easily Removed

No Downward Pressure During Installation
No Support Shoulder Required
Ideal For Thin Wall Applications
Easily Removed

Reusable - allows easy access to sealed passageways
Seals to 56,000 psi
Usable to 600 °F
All CRES construction - no sealants or O-rings
Floating Seal Self Aligns - Prevents Galling
Axial force only - small boss size
Custom designs considered

The Lee Plug is a cylindrical plug with a tapered hole part way through its center and numerous small grooves on its outside diameter. It is slipped into a reamed counterbore in the product. A tapered pin is then driven into the plug until the ends of the pin and the plug are flush with each other. Controlled expansion causes the lands and grooves of the plug to "bite" into the surrounding material forming independent seals and retaining rings. Result: a positive, reliable, leak and trouble-proof seal for both liquids and gases. This simple principle opens the way to vast improvements in design and manufacture of all fluid devices.

The Lee Plug is simply the most successful method to seal drilled holes for critical applications. Over 100 million are in use on aircraft, missiles, spacecraft, machine tools, down hole oil tools, molds - anything that requires a permanent leak-proof seal.

Datasheets

Inch Sized Plugs for 3000 psi systems

Ų .093" Aluminum Plugs

Ų .125" Aluminum Plugs

Ų .156" Aluminum Plugs

Ų .187" Aluminum Plugs

Ų .218" Aluminum Plugs

Ų .250" Aluminum Plugs

Ų .281" Aluminum Plugs

Ų .312" Aluminum Plugs

Ų .343" Aluminum Plugs

Ų .406" Aluminum Plugs

Ų .468" Aluminum Plugs

Ų .531" Aluminum Plugs

Ų .656" Aluminum Plugs

Ų .093" Stainless Steel Plugs

Ų .125" Stainless Steel Plugs

Ų .156" Stainless Steel Plugs

Ų .187" Stainless Steel Plugs

Ų .218" Stainless Steel Plugs

Ų .250" Stainless Steel Plugs

Ų .281" Stainless Steel Plugs

Ų .312" Stainless Steel Plugs

Ų .343" Stainless Steel Plugs

Ų .406" Stainless Steel Plugs

Ų .468" Stainless Steel Plugs

Ų .531" Stainless Steel Plugs

Ų .656" Stainless Steel Plugs

Ų .093" Monel Plugs

Ų .125" Monel Plugs

Ų .156" Monel Plugs

Ų .187" Monel Plugs

Ų .218" Monel Plugs

Ų .250" Monel Plugs

Ų .281" Monel Plugs

Ų .343" Monel Plugs

Ų .406" Monel Plugs

Ų .468" Monel Plugs

Ų .531" Monel Plugs

Ų .656" Monel Plugs

Metric Sized Plugs for 200 bar systems

Ų 2,50mm Aluminum Metric Plugs

Ų 3,00mm Aluminum Metric Plugs

Ų 3,50mm Aluminum Metric Plugs

Ų 4,00mm Aluminum Metric Plugs

Ų 4,50mm Aluminum Metric Plugs

Ų 5,00mm Aluminum Metric Plugs

Ų 5,50mm Aluminum Metric Plugs

Ų 6,00mm Aluminum Metric Plugs

Ų 6,50mm Aluminum Metric Plugs

Ų 7,00mm Aluminum Metric Plugs

Ų 7,50mm Aluminum Metric Plugs

Ų 8,00mm Aluminum Metric Plugs

Ų 2,50mm Stainless Steel Metric Plugs

Ų 3,00mm Stainless Steel Metric Plugs

Ų 3,50mm Stainless Steel Metric Plugs

Ų 4,00mm Stainless Steel Metric Plugs

Ų 4,50mm Stainless Steel Metric Plugs

Ų 5,00mm Stainless Steel Metric Plugs

Ų 5,50mm Stainless Steel Metric Plugs

Ų 6,00mm Stainless Steel Metric Plugs

Ų 6,50mm Stainless Steel Metric Plugs

Ų 7,00mm Stainless Steel Metric Plugs

Ų 7,50mm Stainless Steel Metric Plugs

Ų 8,00mm Stainless Steel Metric Plugs

High Pressure Lee Plugs

Inch Sized Plugs for 8000 psi systems - For high pressure systems, The Lee Company has developed the High Strength Plug. The design has been optimized for use in high strength/high hardness materials such as the precipitation hardenable steels and titanium commonly found in high pressure systems.

Ų .093" High Strength Lee Plug

Ų .125" High Strength Lee Plug

Ų .156" High Strength Lee Plug

Ų .187" High Strength Lee Plug

Ų .218" High Strength Lee Plug

Ų .250" High Strength Lee Plug

Ų .281" High Strength Lee Plug

Ų .312" High Strength Lee Plug

Ų .343" High Strength Lee Plug

R.F.O. (Radial Force Only) Lee Plugs

Radial Force Only Plugs for 1500 psi systems - For sealing holes in thin walls or fragile materials the R.F.O. plug is available. Because the R.F.O. doesn't require a seating shoulder, holes in extra-thin walled canisters, tanks, piping or ducts can be sealed. The installation system assures that no downward pressure is applied to the product.

Ų .156" R.F.O. Lee Plug

Ų .187" R.F.O. Lee Plug

Ų .218" R.F.O. Lee Plug

Ų .250" R.F.O. Lee Plug

Ų .281" R.F.O. Lee Plug

Ų .343" R.F.O. Lee Plug

Ų .406" R.F.O. Lee Plug

Ų .468" R.F.O. Lee Plug

Ų .500" R.F.O. Lee Plug

Ų .531" R.F.O. Lee Plug

Ų .656" R.F.O. Lee Plug

Ų .750" R.F.O. Lee Plug

Ų .875" R.F.O. Lee Plug

A.F.O. (Axial Force Only) Lee Plugs

Axial Force Only Plugs provide a leak-tight, metal to metal seal in high pressure (seals up to 56,000 psi) and high temperature applications. Designed to be both removable and reusable, the plugs feature a unique floating seal that self-aligns to prevent galling.

Ų .190" A.F.O. Lee Plug

Ų .250" A.F.O. Lee Plug

Ų .312" A.F.O. Lee Plug

Ų .375" A.F.O. Lee Plug

Ų .500" A.F.O. Lee Plug

Ų .625" A.F.O. Lee Plug

Ų .750" A.F.O. Lee Plug

Ų .250" Dual Sealing A.F.O. Lee Plug

Ų .500" Dual Sealing A.F.O. Lee Plug

Ų .750" Dual Sealing A.F.O. Lee Plug

The Principle of Lee Plug Performance

Technical comments on Boss Design and Stresses

Materials & Plug Proof Pressure

Surface Treatment & Depth of Hole, Proper Fit and Elongation

Unsymmetrical Boss Stress & Dissimilar Materials

Stress Corrosion

For more information, please send us your application information via our ASK LEE service. Or contact our application engineers in the USA at 1-800-LEE-PLUG or our representatives around the world.
Copyright 03/2010 by The Lee Company, USA
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