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.

Shaft Diameter Seal Part Number* Gland Depth R
(inches)**
Gland Width
(inches) ±0.005″
3.375″ 85.73 mm 668-4 0.250″ 0.405″
4.500″ 114.30 mm 668-32 0.250″ 0.405″
9.750″ 247.65 mm 668-18 0.375″ 0.594″
10.500″ 266.70 mm 668-39 0.375″ 0.594″
11.250″ 285.75 mm 668-33 0.375″ 0.594″
13.000″ 331.80 mm 668-27 0.375″ 0.594″
15.500″ 393.70 mm 668-16 0.375″ 0.594″
  • Additional KLS sizes can be furnished, subject to a one-time tooling charge to help to defray associated engineering, machining and set-up expenses.
  • To download the current rotary seal implementation guidelines (Kalsi Seals Handbook) in PDF format, click here.
  • Seal purchase orders should be sent to the attention of Seal Sales via fax at 281-240-0255), or by e-mail.

Updated August 29, 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.