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Rod-piston seal K21-48x63x10 NBR

CodeK21-048/6 NBR
In stock6pcs
Priceexcl. VATFrom €2.96/pcs
Rod-piston seal K21-48x63x10 NBR—
€2.96excl. VAT

Price by quantityexcl. VAT

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Technical data

Properties
Seal typeK21
Material typeNBR
BrandKastas
Weight23g
Hydraulic seals dimension
Rod diameter d48mm
Groove Diameter D63mm
Seal width h10mm

Documents

Description

K21 piston-rod seal with dimensions 48×63×10 mm, made of NBR rubber. Used in hydraulic and pneumatic cylinders as a double-acting seal. The K21 profile was developed by Kastas to work on both the piston and the piston rod – it can be installed in either location. Thanks to its symmetrical design, it ensures sealing in both directions of operation. Design features: symmetrical profile – installation on the piston or the piston rod, double-acting sealing lip, stable seating in the groove, intended for reciprocating motion. Technical parameters (according to the Kastas catalogue): Inner diameter: 48 mm (≈ 1.89 in) Outer diameter: 63 mm (≈ 2.48 in) Height: 10 mm (≈ 0.39 in) Material: NBR (nitrile rubber) Maximum pressure: 150 bar Working speed: up to 0,5 m/s Material – NBR (nitrile rubber): good resistance to mineral oils, greases and fuels, wear resistance in dynamic motion.

Material

NBR (nitrile butadiene rubber)

  • Operating temperature-30 °C to +100 °C

Good with oils, fuels, water and compressed air. Not for brake fluid, solvents, strong acids or sunlight.

Chemical resistance
Can be usedDo not use
Mineral oil, grease and hydraulic oil (H, H-L, H-LP)Brake fluid (DOT 3, DOT 4, DOT 5.1): the ring swells quickly
Diesel, fuel oil, keroseneSunlight and open air (ozone): the rubber cracks
Petrol (gasoline), propane, butaneAcetone, MEK, ethyl acetate and similar solvents
Water and water-based liquids, up to +80 °CBenzene, toluene, trichloroethylene (aromatic and chlorinated solvents)
Compressed air, also with oil mistSynthetic ester oils and fire-resistant fluid HFD-R
Water-based fire-resistant hydraulic fluids (HFA, HFB, HFC)Strong (concentrated) acids, e.g. nitric and sulfuric, and strong oxidizers
Oil-and-water emulsionsSteam and hot water above +100 °C
Weak acids, alkalis and salt solutions, at room temperature
Use with cautionPetrol with a lot of bioethanol (E10, E85): better use FKM (Viton)

Shows low compression set within the recommended temperature range.

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