B No Lip Single Cased

Overview

This product is designed without a tension spring and protective lip, featuring an open metallic outer jacket. The sealing materials include NBR and FKM, and the stiffening plate is made from unalloyed steel (DIN EN 10139, DIN 1624).

Function

It provides dynamic sealing for rotating shafts regardless of the direction of rotation. The metallic outer jacket ensures a tight and precise fit, although it offers only limited static sealing between the sealing lip and the shaft when stationary. It also provides limited sealing for low-viscosity and gaseous media, as well as in split housings.

Product Advantages

The product ensures a tight fit in the installation space due to its interference fit, offering a long service life. Its reliable design is suitable for a wide range of moderately demanding industrial applications, delivering excellent value for money. It is manufactured by certified external suppliers, guaranteeing high quality and reliability.

Applications

Ideal for sealing against grease, this product can also serve as subordinate seals, such as dust, dirt, or splash protection seals for electric motors.

This product is equipped with a tension spring and a protective lip, featuring an open metallic outer jacket. The sealing materials used are NBR and FKM, with a stiffening plate made from unalloyed steel (DIN EN 10139, DIN 1624) and a spring made from spring steel (DIN EN 10270-1).

Application Limits

  • Maximum pressure: 0.05 MPa
  • NBR temperature range: -40 to 80°C (short-term up to 100°C), max speed: 10 m/s
  • FKM temperature range: -25 to 200°C, max speed: 34 m/s

Media Resistance

NBR:

  • Resistant to various mineral oils and greases
  • Limited resistance to ozone, weathering, and aging

FKM:

  • Resistant to mineral and synthetic oils, fuels, and flame-retardant fluids
  • Excellent resistance to ozone, weathering, and aging

Design Guidelines

  • Design installation space according to DIN 3760
  • Ensure shaft roundness (tolerance class IT8) and appropriate surface roughness (Rz = 1.0 to 4.0 µm)
  • Shaft surface hardness should be at least 45 HRC
  • Housing surface roughness: Rz = 10 to 20 µm
  • Shaft tolerance zone: ISO h11; housing tolerance zone: ISO H8

Installation Guidelines

  • Thoroughly clean the installation area before assembly
  • Avoid pulling the seal over sharp edges; use a mounting sleeve if necessary
  • Do not grease the seal or installation space
  • Ensure careful, non-tilted installation on the shaft

Storage Advice

  • Store at temperatures below 25°C
  • Avoid direct heat sources, sunlight, and condensation
  • Protect from ozone or ionizing radiation
  • Follow ISO 2230 storage recommendations

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