KLS® Lip Seal Sizes

KLS spring-loaded lip seals have remarkable high-pressure performance, compared to other spring-loaded lip seals. This performance is due to the hydrodynamic interfacial lubrication of the extrusion-resistant plastic portion of the seal. This interfacial lubrication is provided during rotation by a patented hydrodynamic wave geometry on the low-pressure end of the seal.

Like all Kalsi-brand rotary shaft seals, the KLS seal requires a lubricant reservoir to accommodate the hydrodynamic pumping related seal leakage. Unlike most Kalsi-brand seals, the lubricant for the KLS seal can be supplied from a simple gravity fed reservoir.

The KLS seal was designed as a rotating control device (RCD) seal. It has been tested with 1,000 psi differential pressure at 545 ft/minute and 1,500 psi at 136 ft/minute. It can be used in most pressure-retaining applications that require high performance rotary lip seals.

Additional KLS sizes can be furnished, subject to a one-time tooling charge to help to defray associated engineering, machining and set-up expenses. Purchase orders and quote requests for this unique high pressure lip seal should be sent to the attention of Seal Sales via fax at 281-240-0255), or by e-mail.

Shaft DiameterSeal Part Number*Gland Depth R
Gland Width
Gland Width Tolerance (inches)
3.375″85.73 mm668-40.250″0.404″±0.004
4.500″114.30 mm668-320.250″0.404″±0.004
9.750″247.65 mm668-180.375″0.599″±0.005
10.500″266.70 mm668-390.375″0.599″±0.005
11.250″285.75 mm668-330.375″0.599″±0.005
13.000″331.80 mm668-270.375″0.599″±0.005
15.500″393.70 mm668-160.375″0.599″±0.005
  • To view the current rotary seal implementation guidelines (Kalsi Seals Handbook) in PDF format, click here.

Updated December 12, 2018

Kalsi-brand rotary seals are offered for sale under the terms and conditions of the “Offer of Sale” that is included in the current revision of the Kalsi Seals Handbook.