Oil seals - Difference between R21 Single Lip & R23 Double Lip

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An R21 type oil seal is a single lipped rubber coated seal with a metal inner. R21 type seals against internal media.

Alternate References: CB / SC / A / DG / 827N / BA / A103 / WA

An R23 type oil seal is a double lipped rubber coated seal with a metal inner. R23 type seals against internal media and offers an auxiliary lip which provides protection against dirt and dust.

Alternate References: CC / TC / AS / DGS / 827S / BASL / A104 / WAS

An R1 type oil seal is a totally metal enclosed seal.

Alternate References: C / SA / DB / SFK / 824N / B2 / B303 / WC

An R4 type oil seal is a single lipped metal cased seal.

Alternate References: B / SB / BB / DF / 822N / B1 / B207 / WB

An R5 type oil seal is a double lipped double sprung metal cased seal.

Alternate References: BK

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An R6 type oil seal is a double lipped metal cased seal.

Alternate References: BC / TB / DFS / 822S / B1SL / B210 / WBS

An R12 type oil seal is a single lipped springless metal cased seal.

Alternate References: BD / WBO

An R22 type oil seal is a double lipped double sprung rubber coated seal with a metal inner.

Alternate References: CK / WAD

An R25 type oil seal is a single lipped springless seal.

Alternate References: CD / WAO

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Oil Seals - Differences between R21 and R23

Further Information

A R21 Oil seal is a single lipped rubber coated seal with a metal inner:

 A R23 Oil seal is a double lipped rubber coated seal with a metal inner:

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