Rotary shaft seal types
TB oil seal: sealing lip and dust lip, metal outside diameter
A TB seal is a spring-loaded sealing lip plus a dust lip in a bare metal case: the dust duty of a TC with the exact seat of a metal outside diameter. 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
- TB
- Lips
- 2
- Dust lip
- Yes
- Garter spring
- Yes
- Outside diameter
- Metal
- Case
- single metal case
- Pressure
- 0.3 bar (4.4 psi) (rated by NOK® for its standard types; not a pressure seal)
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
Retaining oil or grease with fine dust outboard, in a bore that must locate the seal exactly. The dust duty of a TC with the precise seat of a metal outside diameter.
When another type fits better
- TC: Sealing lip and dust lip, rubber-covered outside diameter, when the duty generates pressure, or the housing expands with heat.
A designation match is not a fit, form and function match. These schemes measure different things, and the same letter means different things in different catalogs. Confirm the three dimensions, the lip material and the duty against the drawing before substituting any seal.
| Letter code | ISO 6194-1 | JIS B 2402 | JASO | DIN 3760/3761 form |
|---|---|---|---|---|
| TB | Type 1 With Lip | TYPE 5 | DM | BS (our reading) |
Sources: NOK Oil Seals catalogue 014E, read 2026-09-16; Freudenberg Technical Manual for Simmerring® seals and rotary seals, read 2026-09-16; ISO 6194-1: Rotary shaft lip-type seals incorporating elastomeric sealing elements, Part 1: Nominal dimensions and tolerances, ISO 6194-1:2007, read 2026-09-27; JIS B 2402-1: Rotary shaft lip-type seals incorporating elastomeric sealing elements, Part 1: Nominal dimensions and tolerances, Japanese Standards Association, JIS B 2402-1:2013, read 2026-09-27.
NOK is a trademark of NOK Corporation; Simmerring is a trademark of Carl Freudenberg KG. 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.
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