Drilled Hole Sealing Plugs - Koenig Expanders

Koenig sealing plugs seal holes with complete reliability. Expansion plug technology forms a 100% leakproof metal-to-metal seal

Koenig Expanders seal holes with complete reliability. Expansion technology forms a tight metal-to-metal seal that’s 100% leakproof.

Koenig drilled hole sealing plugs have revolutionised hole sealing in nearly every advanced industry. 5 billion units have been installed globally with failure rates below 1PPM. From hydraulics and oil rigs to automotive and aerospace applications, Koenig expanders reliably stop holes leaking under high pressures in extreme environmental conditions.

Pull-type expanders

Pull-style expanders do not need a counter bore to be used. The integrated mandrel inserts the plug into the hole, before pulling it back to form a complete seal. Pull-style expanders are ideal when holes are located across different faces. They are easily aligned making them ideal for angled channels. They can be set quickly using a hydro-pneumatic or battery powered hand tool easily installed into an assembly or production line.

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Push-type expanders

Push-style expanders require a counter bored hole for correct installation. The plug is placed up to the counter bore. The ball is pressed into a seated cup. The ball causes the serrated grooves to expand and anchor into the base material, forming a completely secure metal-to-metal seal. Ball type expander plugs require a setting tool that is fitted to a press, or for accuracy and repeatability with stroke control, an Express 3000/5000 Hydropneumatic Press.

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