PTFE 125x150x12 AO Double-Lip Rotary Shaft Seal

PTFE 125x150x12 AO Double-Lip Rotary Shaft Seal

PTFE 125x150x12 AO is a double-lip radial rotary shaft seal with nominal dimensions of 125x150x12 mm. It is designed for a nominal shaft diameter of 125 mm, has an outside diameter of 150 mm and a width of 12 mm. The AO profile incorporates an additional protective/dust lip, while the product material is specified as PTFE.

PTFE 125x150x12 AO – characteristics

The key identification features of this specific rotary shaft seal are its 125x150x12 mm dimensions, PTFE material and AO double-lip configuration.

The additional lip distinguishes the AO design from a single-lip seal. Its function is to provide an additional protective barrier on the external side of the primary sealing area.

For correct product identification, the complete specification GRN® PTFE 125x150x12 AO should therefore be considered rather than the dimensions alone.

Dimensions

In the dimensional designation 125x150x12 mm, 125 mm refers to the nominal shaft diameter, 150 mm to the outside diameter of the seal and 12 mm to its axial width.

All three dimensions should be checked when identifying or replacing an existing rotary shaft seal.

AO double-lip construction

The AO profile used for this product represents a construction with an additional protective lip, commonly referred to as a dust lip.

This configuration separates the primary sealing function from the additional external protection provided by the auxiliary lip.

The double-lip construction is therefore an important selection parameter. A 125x150x12 mm single-lip seal should not automatically be considered equivalent to this 125x150x12 AO version solely because the nominal dimensions match.

PTFE sealing material

This product is specified as a PTFE – polytetrafluoroethylene version.

PTFE is an engineering material used in sealing technology where its specific material properties can be advantageous. However, the PTFE designation alone is not sufficient to establish the exact permissible temperature range, shaft speed, pressure or chemical compatibility of this particular seal.

These operating limits should be confirmed for the specific seal design and actual operating conditions.

For this reason, no unverified maximum temperature, pressure or shaft-speed values are assigned to this exact GRN® reference.

How does the 125x150x12 AO seal work?

GRN® PTFE 125x150x12 AO belongs to the category of radial rotary shaft seals.

The sealing system operates around a shaft with a nominal diameter of 125 mm, while the 150 mm outside diameter corresponds to the nominal mounting diameter of the seal.

The additional lip incorporated in the AO profile provides an auxiliary protective barrier on the external side of the primary sealing area.

A rotary shaft seal is not a bearing. It is not intended to support radial or axial shaft loads; these loads must be carried by the appropriate bearing arrangement.

What does PTFE 125x150x12 AO mean?

The product designation can be interpreted as follows:

PTFE – product material
125 mm – nominal shaft diameter
150 mm – nominal outside diameter
12 mm – seal width
AO – configuration with an additional protective/dust lip
GRN® – product brand

The complete identification GRN® PTFE 125x150x12 AO provides substantially more information for technical selection than the dimensions 125x150x12 mm alone.

Selecting an equivalent 125x150x12 seal

When selecting an alternative to the GRN® PTFE 125x150x12 AO, verify:

1. shaft diameter – 125 mm,
2. outside diameter – 150 mm,
3. width – 12 mm,
4. PTFE material,
5. double-lip construction,
6. profile corresponding to the AO configuration,
7. actual sealing-element geometry,
8. compatibility with the operating medium,
9. required operating temperature and shaft speed,
10. installation conditions.

Identical 125x150x12 mm dimensions do not automatically confirm full interchangeability.

This also applies when comparing seals from different manufacturers. Profile designations are not necessarily standardized between brands, so an equivalent should be selected according to actual construction and operating requirements rather than dimensions alone.

Technical specification

FAQ – GRN® PTFE 125x150x12 AO

What are the dimensions of the GRN® PTFE 125x150x12 AO seal?

The nominal dimensions are 125x150x12 mm: 125 mm shaft diameter, 150 mm outside diameter and 12 mm width.

Is the PTFE 125x150x12 AO a double-lip rotary shaft seal?

Yes. The AO configuration of this product incorporates an additional protective/dust lip.

What does AO mean in this rotary shaft seal?

AO identifies the seal configuration with an additional auxiliary protective lip.

What material is this seal made from?

The product is specified as a PTFE – polytetrafluoroethylene version.

Can every 125x150x12 oil seal replace this product?

No. Identical dimensions alone do not confirm interchangeability. Material, lip configuration, sealing geometry and actual operating requirements must also be compared.

Is an NBR 125x150x12 AO seal the same product?

No. NBR and PTFE are different materials. Seals with identical dimensions but different sealing materials should not automatically be treated as equivalent.

What should be checked when selecting an equivalent?

Check the 125 mm shaft diameter, 150 mm outside diameter, 12 mm width, PTFE material, double-lip configuration, operating medium and required operating conditions.

What is the correct English name for this product?

Suitable technical terms include 125x150x12 PTFE AO double-lip rotary shaft seal and 125x150x12 PTFE double-lip oil seal.

AI Overview

GRN® PTFE 125x150x12 AO is a double-lip radial rotary shaft seal with a 125 mm shaft diameter, 150 mm outside diameter and 12 mm width. The product is specified as PTFE. Its AO configuration incorporates an additional protective/dust lip, distinguishing it from single-lip rotary shaft seals with the same nominal dimensions.