SKF HMSA10 RG Radial Shaft Seal, 40 x 56 x 8mm

The HMSA10 is an SKF CR Seal with a rubber outside diameter, a spring-loaded main sealing lip and a non-contacting auxiliary lip.

An oil seal has two main parts: an outer cylindrical casing that is a press fit in the housing bore, and a sealing lip that runs on the shaft. The lip is what keeps oil or grease in and contamination out at the point where the shaft passes through the housing. The sealing material is NBR (nitrile rubber). SKF standard nitrile rubber is a general-purpose sealing lip material that resists most mineral oils and greases, normal fuels such as petrol and diesel, animal and vegetable oils and fats, and hot water, and tolerates short-term dry running. The HMSA10 range is for oil or grease lubricated applications with a circumferential speed up to 14 m/s and a maximum operating pressure of 0.03 MPa.

Where this product is used

• Gearboxes and speed reducers
• Pumps and motors
• Rollers and general rotating equipment
• Shaft penetrations in housings where lubricant must stay in

Features

• Rubber outside diameter that seals in the housing, including a rough or split housing
• Beads on the outside diameter that help the seal hold in the bore and resist spring-back during installation
• Spring-loaded main sealing lip
• Non-contacting auxiliary lip
• Oil or grease lubricated applications
• NBR (nitrile rubber) sealing material
• 3 sizes: 40 x 56 x 8mm, 55 x 72 x 10mm, 70 x 110 x 8mm

Key specifications

Choosing the right option

The 40 x 56 x 8mm and 55 x 72 x 10mm sizes are is a pack of 2. The 70 x 110 x 8mm size is is a single seal.

Check the shaft diameter, housing bore diameter and seal width against your application before ordering, and use the dimensions in the sizes table above. The shaft surface the lip runs on must be clean and free from scoring. If the shaft is worn at the seal position, a shaft repair sleeve fixes this without replacing the shaft: SKF Speedi-Sleeve.