Rotary shaft seal types
TCN and TCZ oil seals: pressure-resistant lip with an auxiliary cage
A TCN seal puts a cage behind the lip so pressure cannot deform it; the TCZ is the same construction at the top of the maker's surge range. Conquest Seal supplies radial shaft seals, also sold as rotary shaft seals, rotary lip seals and oil seals, in inch and metric sizes. Send the part number or drawing and we quote it.
- Family
- Radial lip seals
- Designation
- TCN
- Lips
- 2
- Dust lip
- Yes
- Garter spring
- Yes
- Outside diameter
- Rubber-covered
- Case
- metal insert with auxiliary cage
- Pressure
- 9.8 bar (142 psi), as a momentary surge peak, NOK®
- Pressure (TCZ)
- 20 bar (290 psi), as a momentary surge peak, NOK
Radial lip seals
A flexible lip pressed against a rotating shaft by a garter spring, held in the housing by a case. This is what most people mean by an oil seal, and it retains lubricant at low pressure rather than holding pressure.
When to use it
Rotating shafts at higher pressure. The lip needs physical support behind it rather than extra stiffness. The cage limits how far the lip can deform under pressure.
When another type fits better
- TCV: Pressure-resistant lip, stiffened, when the pressure is moderate and a stiffened lip is enough.
Also covered on this page
- TCZ: Pressure-resistant lip, highest surge rating. Rotating shafts at the top of the maker's surge range. The same construction as TCN, rated higher.
Sources: NOK Oil Seals catalogue 014E, read 2026-09-16.
NOK is a trademark of NOK Corporation. The maker designations on this page are the makers' own. No affiliation or endorsement is implied.
Related pages
Orders are handled under Conquest Seal's AS9100D quality management system, whose certificate scope includes distribution.
Send the shaft, bore and width, or the old seal's markings
The three dimensions or the code printed on the old seal, the speed, any pressure, the fluid and the quantity. A Conquest representative replies with the quote.
Request a quoteLast updated