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Scale Seal (WR...RJ, MH...J, H...J Types)

WR...RJ・MH...J・H...J / JTEKT Corporation (Official website)

Scale seals and scale covers for shaft diameters of 210 to 1203 mm. Made of nitrile rubber.

Last verified: (date the content was verified against the source document)

Specifications

Shaft diameter d 210～1203 mm
Lip Material Nitrile rubber

How to choose Oil Seals

Points to check when selecting, with the values for this product (Scale Seal (WR...RJ, MH...J, H...J Types)).

  1. 1. Match shaft diameter and housing bore

    This product: Shaft diameter d 210～1203 mm

    Select shaft diameter d and outer diameter D by nominal dimensions to suit the mating shaft and housing bore. Listed shaft diameters range widely from 6 to 3530 mm. Some standard types are designed assuming shaft tolerance h8 and housing bore tolerance H7/H8. Deviation from fit tolerances can cause leakage or seal dislodgement.

  2. 2. Check width fits the installation space

    Confirm that width b fits within the axial installation space. Listed products are 5 to 30 mm. For large types, cross-section width, groove width, and presence of spacers are also part of the dimensional requirements, so verify against the housing groove dimensions.

  3. 3. Select lip material suited to fluid and temperature

    This product: Lip Material Nitrile rubber

    Lip material governs oil resistance and heat resistance. Nitrile rubber is a general-purpose material for mineral oils, acrylic and fluororubber suit the high-temperature range, and silicone readily covers low to high temperatures. PTFE lips are suitable for chemicals and high temperatures, and food-hygiene-compliant materials are available for food machinery.

  4. 4. Allow margin in operating temperature range

    Confirm that the continuous operating temperature range includes the running oil temperature. Temporary temperature rises, such as at startup, are judged by the short-term maximum temperature (120 °C in one listed example). However, if the normal operating temperature is close to the upper limit, rubber hardening and lip wear will accelerate.

  5. 5. Verify shaft surface speed is within limit

    Surface speed is the lip sliding speed calculated from shaft diameter and rotational speed. The listed maximum surface speeds are 5 to 20 m/s, and exceeding them causes lip deterioration from frictional heat. Even at the same rotational speed, surface speed increases with larger shaft diameter, so check this particularly for large-diameter shafts.

  6. 6. Confirm maximum sealing pressure limit

    Standard oil seals are intended for low-pressure use. Listed maximum operating pressures vary greatly by type, from 0.03 to 15 MPa, so select a pressure-resistant type for applications with internal pressure. Under pressure the lip is pressed strongly against the shaft, making heat generation more likely.

This guide was written by AI based on the listed products' documents and specification items.

About Oil Seals and all products

Description

Large-diameter seals of RJ, MH, and H types. The H type is used as a scale cover.

Features

  • Models with scale cover available

Applications

  • Sealing and dust protection of large-diameter rotating shafts

FAQ

Q. What is the usable shaft diameter range of the Scale Seal (WR...RJ, MH...J, H...J Types)?
A. The shaft diameter d is 210 to 1203 mm.
Q. What is the lip material of the Scale Seal (WR...RJ, MH...J, H...J Types)?
A. The lip material is nitrile rubber.
Q. What applications is the Scale Seal (WR...RJ, MH...J, H...J Types) used for?
A. It is used for sealing and dust protection of large-diameter rotating shafts.
Q. How is the H type of the Scale Seal (WR...RJ, MH...J, H...J Types) used?
A. The H type is used as a scale cover. Models with a scale cover are also available.

Written by AI based on the content of the source documents.

Source documents

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