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Rod seal K21-8x13x7 NBR

CodeK21-008/9 NBR
In stock15pcs
Priceexcl. VATFrom €1.38/pcs
Rod seal K21-8x13x7 NBR—
€1.38excl. VAT

Price by quantityexcl. VAT

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Technical data

Properties
Seal typeK21
Material typeNBR
BrandKastas
Weight1g
Hydraulic seals dimension
Rod diameter d8mm
Groove Diameter D13mm
Seal width h7mm

Documents

Description

U-ring K21 8x13x7 NBR is a rod (gland) seal for hydraulic and pneumatic applications. The K21 profile made of nitrile rubber (NBR) performs well in contact with typical operating media. Technical parameters: Profile: K21 (U-ring) Application type: gland / piston rod Material: NBR (nitrile rubber) Type of operation: reciprocating motion Seal dimensions: Inner diameter (d): 8 mm Outer diameter (D): 13 mm Height (H): 7 mm Size in inches (d x D x H): 0.315 x 0.512 x 0.276 Additional information: Media: mineral oils, greases, air; water in limited conditions Typical applications: hydraulic and pneumatic cylinders Related phrases: U seal K21 NBR 8x13x7, K21 gland sealing ring, U-ring 8x13x7 NBR.

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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