![]() ![]() Lee Plugs and Pins are made from materials that fall within the overall limits of the specifications shown. 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. The installation system assures that no downward pressure is applied to the product.įor high-pressure systems, The Lee Company has developed the High Strength Plug. doesn’t require a seating shoulder, holes in extra-thin walled canisters, tanks, piping, or ducts can be sealed. In addition, Lee Plugs are available in 2024-T6 Al, 6061-T6 Al, 316 CRES, and 6AL-4V Ti.įor sealing holes in thin walls or fragile materials, the R.F.O. ![]() The Lee Plug is stocked in five materials in English sizes (2024-T4 or T351 Aluminum, 7075-T6 or T651 Aluminum, 416 CRES, 303 CRES, and R405 Monel in long sizes) and three materials (2024-T4 or T351 Aluminum, 416 CRES, and 303 CRES) in the metric sizes. Lee Plug expansion plugs are available in four different versions the original Lee Plug, the QIP Plug, the R.F.O. Two certificates of performance (one for the pin lot and one for the plug lot) accompany every shipment of Lee Plugs. A representative sample of the mating pin or plug is performance tested to a Lee Company process specification for installation, leakage, pin retention, proof pressure, and thermal stability. In addition, every lot of Lee Pins and Plugs is production acceptance tested. All plugs and pins are 100% visually inspected. Critical dimensions are 100% checked and others are statistically checked. Lee Plugs are manufactured to exacting tolerances. Over 150 million are in use on aircraft, missiles, spacecraft, machine tools, downhole oil tools, molds – anything that requires a permanent leak-proof seal. The Lee Plug is simply the most successful method to seal drilled holes for critical applications. This simple principle opens the way to vast improvements in the design and manufacture of all fluid devices. Result: a positive, reliable, leak and trouble-proof seal for both liquids and gases. ![]() The controlled expansion causes the lands and grooves of the plug to “bite” into the surrounding material forming independent seals and retaining rings. A tapered pin is then driven into the plug until the ends of the pin and the plug are flush with each other. It is slipped into a reamed counterbore in the product. The Lee Plug is a cylindrical plug with a tapered hole partway through its center and numerous small grooves on its outside diameter. ![]()
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