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Rod seal K22 18x24x5

CodeK22-018 PU
In stock21pcs
Priceexcl. VATFrom €2.03/pcs
Rod seal K22 18x24x5—
€2.03excl. VAT

Price by quantityexcl. VAT

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Technical data

Properties
Seal typeK22
Material typePU
BrandKastas
Weight2g
Hydraulic seals dimension
Rod diameter d18mm
Groove Diameter D24mm
Seal width h5mm

Documents

Description

Hydraulic gland seal type K22 - single-acting seal. Also called a "lip seal". It has lips that differ in shape and size. The inner (dynamic) lip is shorter than the outer (static) one and faces the piston rod, which gives a high sealing effect. The K22 ring is used to seal the piston rod of a hydraulic cylinder. It is made of PU material. The dimensions d and D given in the designation correspond to the housing; that is, to select a seal, you need to measure the inner and outer diameter of the housing in which the ring is installed. The third dimension b in the designation is equal to the height of the ring. This value b should always be smaller than the groove width B. This clearance is necessary for the seal to work properly. The difference B-b for cups with a height of up to 4,76 mm is 0,5 mm (-0 / + 0,2), for cups with a height above 4,81 mm it is 1 mm (-0 / + 0,2). This ring can be easily installed in closed grooves. Use installation tools made of soft materials without sharp edges. Lubricate the seal with hydraulic oil before installation.

Material

PU / TPU / H-PU (polyurethane)

  • Standard PU / TPU-30 °C to +80 °C

Best for high pressure and abrasion, in mineral hydraulic oil. Standard PU must never meet hot water, steam or brake fluid, or run hotter than +90 °C.

Chemical resistance
Can be usedDo not use
Extreme pressure and pulsation (up to 40-50 MPa, very resistant to extrusion into the gap)Hot water and steam with standard PU: hydrolysis, it breaks down into powder
Abrasion, friction, cutting and tearing (4-5 times tougher than NBR)Glycol brake fluid (DOT 3, DOT 4, DOT 5.1): swells quickly
Mineral hydraulic oil (HL, HLP) and greaseHigh temperatures above +90 to +100 °C with standard TPU: it softens
Fuel oil, diesel and technical oils (aliphatic hydrocarbons)Strong (concentrated) acids and alkalis: sulfuric, nitric, caustic soda
Ozone, weather and sunlight (does not crack from weather)Acetone, MEK, toluene, benzene, dichloromethane (polar and aromatic solvents)
Water-based fire-resistant fluids HFA, HFB (only special H-PU)Synthetic ester oils and fire-resistant fluid HFD-R
Dry compressed air and technical gasesStrong alcohols (methanol, ethanol): swelling

Water and heat destroy standard PU: above +50 to +60 °C in water or damp oil it turns into a sticky paste or crumbles. If the system contains water or an emulsion, use only H-PU (hydrolysis-resistant).

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