Retainers and Collars

The seals are used to create tightness in rotary axes, usually applied in the manufacturing machinery, components and automotive industries.

They are intended to guarantee a tightness in viscous, liquid or gaseous fluids and as usual in greases, oils and lubricants.

Main features:

  • Metal outer ring coated or uncoated elastomer.
  • Sealing lip equipped with a tension spring. Its function is to guarantee the dynamic and static sealing of the axis, that is, both the axis when rotating and at rest.
  • Additional lip for applications where greater security against dust and/or dirt from the outside is required.
  • Manufacture according to DIN 3760, other models to be consulted.

Related documents

Assembly of radial seals

The allowances indicated by the manufacturer must be strictly observed:

  • Material qualities and the axis' machining with Rmax = 6.3 μ.
  • Tolerances of h11 for the axis and H8 for the housing.
  • Shaft hardness from 45 to 60 HRc.
  • Concentricity of the axis from 0.3 to 0.1 mm, according to the rotation speed.
  • Dynamic eccentricity between 0.4 and 0.1 mm, according to the speed.
  • Rmax housing roughness = 10-25 μ depending on the type of seal.
  • The use of mounting caps may be required to avoid damaging the retainer:
  • It is necessary to use chamfers or rounding radii for the assembly according to the assembly's direction.
  • The diameter of the chamfer (d3) is 80% to 95% of the shaft's diameter, and according to its value (between 6 and 500mm)

The bearing's sealing in case of penetration of dirt from the outside

Sealing under pressure (crankshaft of a two-cylinder engine)

Light pressure water seals

Sealing in front of the vacuum

Blocking liquid