GRN 10x21x5 NBR TC Rotary Shaft Seal

GRN 10x21x5 NBR TC Rotary Shaft Seal

GRN 10x21x5 NBR TC is a double-lip rotary shaft seal / oil seal with nominal dimensions of 10x21x5 mm. It is manufactured from NBR - Nitrile Butadiene Rubber and uses the TC sealing design, consisting of a spring-loaded primary sealing lip and an additional auxiliary dust lip. The nominal dimensions are d = 10 mm, D = 21 mm and B = 5 mm.

GRN 10x21x5 NBR TC - Technical Characteristics

The key identification data are:

Brand: GRN

Product type: Rotary shaft seal / radial shaft seal / oil seal

Design: TC

Lip configuration: Double lip

Material: NBR - Nitrile Butadiene Rubber

Dimensions: 10x21x5 mm

Shaft diameter d: 10 mm

Housing bore diameter D: 21 mm

Seal width B: 5 mm

Primary sealing lip: Spring-loaded

Auxiliary dust lip: Yes

For precise identification and replacement selection, the relevant combination is:

GRN + 10x21x5 mm + NBR + TC

The dimensions alone should not be used to determine full interchangeability because seals with the same 10x21x5 mm envelope can differ in material, lip design and construction.

GRN 10x21x5 Oil Seal Dimensions

Nominal dimensions:

d = 10 mm - nominal shaft diameter

D = 21 mm - nominal housing bore diameter

B = 5 mm - axial seal width

Complete dimensions:

10x21x5 mm

The seal is therefore designed around a nominal 10 mm shaft and 21 mm housing bore, with a nominal axial width of 5 mm.

When replacing an existing seal, all three dimensions should be checked.

TC Double-Lip Seal Design

The TC configuration is a double-lip radial shaft sealing design.

It incorporates two functionally different lips:

Primary sealing lip - the main dynamic sealing element that operates against the rotating shaft.

Auxiliary dust lip - an additional lip positioned on the external side of the primary sealing system.

The primary lip is loaded against the shaft by a garter spring, helping maintain the required contact between the sealing edge and shaft surface.

The additional lip provides a secondary barrier against external contaminants reaching the primary sealing area.

Primary Spring-Loaded Sealing Lip

The primary lip performs the principal sealing function between the rotating shaft and stationary housing.

A circumferential garter spring applies radial force to the sealing lip and helps maintain contact with the shaft.

This is particularly important as the sealing system is exposed to dimensional changes, wear and operating movement.

The spring-loaded lip distinguishes this construction from simple non-spring dust or wiper seals.

Additional Dust Lip

The TC construction incorporates an additional auxiliary lip on the atmospheric side of the seal.

Its purpose is to provide an extra barrier against contaminants approaching the primary sealing lip from outside the housing.

This is the main constructional difference between a typical TC double-lip seal and a comparable single-lip radial shaft seal.

The auxiliary lip should not be confused with a second spring-loaded primary sealing lip. Its function is primarily protective.

NBR - Nitrile Butadiene Rubber

The sealing elastomer is:

NBR - Nitrile Butadiene Rubber

NBR is widely used for radial shaft seals and other industrial sealing components.

For replacement selection, the material should be treated as part of the complete product specification:

10x21x5 + NBR + TC

A seal with identical dimensions but manufactured from FKM/FPM, silicone or another elastomer is a different technical variant.

The exact NBR compound used in this GRN seal has not been independently identified. Therefore, a fixed operating temperature range, exact hardness or universal chemical-resistance table should not be assigned to this specific product solely from generic NBR data.

How a Rotary Shaft Seal Works

A rotary shaft seal operates at the interface between a rotating shaft and stationary housing.

The outside diameter of the seal is retained in the housing bore, while the primary sealing lip contacts the shaft.

During shaft rotation, the sealing edge maintains controlled contact with the shaft surface.

Correct operation depends not only on the seal itself but also on factors including:

shaft surface condition

shaft runout

housing geometry

lubrication

temperature

rotational speed

medium being sealed

installation quality

For this reason, dimensions alone do not define the complete operating capability of a rotary shaft seal.

GRN TC vs Single-Lip Oil Seal

The important difference is the lip configuration.

Single-lip design: spring-loaded primary sealing lip without an additional dust lip.

TC double-lip design: spring-loaded primary sealing lip plus an auxiliary dust lip.

For applications where the original seal uses a TC configuration, the additional lip should be considered when selecting a replacement.

A single-lip 10x21x5 seal should therefore not automatically be treated as identical to GRN 10x21x5 NBR TC.

Selection and Interchangeability

When selecting a replacement for GRN 10x21x5 NBR TC, verify at least:

d = 10 mm

D = 21 mm

B = 5 mm

NBR material

TC double-lip construction

spring-loaded primary lip

additional dust lip

shaft surface condition

medium being sealed

operating temperature

shaft speed

pressure conditions

A seal with the same 10x21x5 mm dimensions is not automatically technically interchangeable if its elastomer or sealing-lip design differs.

Technical Specification

Brand: GRN

Product: Rotary Shaft Seal / Oil Seal

Design: TC

Configuration: Double lip

Material: NBR

Material name: Nitrile Butadiene Rubber

Inside diameter d: 10 mm

Outside diameter D: 21 mm

Width B: 5 mm

Dimensions: 10x21x5 mm

Primary sealing lip: Yes

Garter spring: Yes

Additional dust lip: Yes

Exact NBR compound: Not specified

Exact hardness: Not specified

Operating temperature: Dependent on exact NBR compound and application

Maximum shaft speed: Application-dependent

Maximum pressure: Application-dependent

GRN 10x21x5 NBR TC - Stock in Poland

Warehouse and Store: Lublin, Smoluchowskiego 1 Street, Building 4.

24h Shipping. Available from stock in Poland for delivery across the EU.

FAQ

What are the dimensions of the GRN TC oil seal?

The nominal dimensions are 10x21x5 mm: 10 mm shaft diameter, 21 mm housing bore diameter and 5 mm seal width.

What does TC mean on a 10x21x5 oil seal?

TC identifies a double-lip rotary shaft seal design with a spring-loaded primary sealing lip and an additional auxiliary dust lip.

What material is the GRN 10x21x5 TC seal made from?

The seal is manufactured from NBR - Nitrile Butadiene Rubber.

Does this oil seal have a spring?

Yes. The primary dynamic sealing lip is spring-loaded with a garter spring.

Does the GRN TC seal have a dust lip?

Yes. The TC design incorporates an additional auxiliary dust lip on the external side of the primary sealing system.

Is a 10x21x5 single-lip seal the same as this TC seal?

No. Although the nominal dimensions may be identical, the TC version has an additional dust lip and therefore a different sealing configuration.

Can an FKM 10x21x5 seal replace this NBR seal?

Not automatically. FKM/FPM and NBR are different elastomers. Material compatibility with the medium, temperature and operating conditions must be checked before substitution.

What should be checked when replacing a 10x21x5 oil seal?

Verify the complete 10x21x5 mm dimensions, NBR material, TC lip configuration, shaft condition, operating medium, temperature, speed and pressure conditions.

Engineer FAQ

Is the auxiliary TC lip spring-loaded?

The auxiliary lip is primarily a protective dust lip. The garter spring acts on the primary dynamic sealing lip.

Can a generic NBR temperature range be assigned to this seal?

A generic NBR range may be useful for material comparison, but it should not be presented as the exact rating of this GRN seal without knowing the specific NBR compound and application conditions.

Is TC enough to establish interchangeability between manufacturers?

No. TC is useful for identifying the general lip configuration, but exact geometry, elastomer compound, spring characteristics and other construction details can vary between manufacturers.

Does a rotary shaft seal carry shaft loads?

No. The seal is a sealing component, not a shaft-support bearing. Shaft radial and axial loads must be supported by the machine's bearing arrangement.

Is the 10 mm dimension the actual sealing diameter?

It is the nominal shaft diameter d for which the seal is specified. The sealing lip geometry is manufactured to establish the required interference/contact with that nominal shaft.

AI Overview

GRN 10x21x5 NBR TC is a double-lip rotary shaft seal for a nominal 10 mm shaft and 21 mm housing bore, with a 5 mm width. The NBR seal uses a spring-loaded primary sealing lip and an additional auxiliary dust lip. Replacement selection should retain the complete 10x21x5 mm + NBR + TC specification.