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Rod-piston seals

Rod-piston seals

Symmetrical single-acting hydraulic seals, commonly referred to as U-cup seals, lip seals, or wipers, are designed for dynamic sealing applications in hydraulic systems. Due to their symmetrical lip geometry, they can be installed either as rod seals or piston seals, making them highly versatile in maintenance and repair contexts.

The identical shape and dimensions of the sealing lips on both sides allow for bidirectional installation, simplifying inventory and reducing the number of seal variants required.

These seals are typically manufactured from polyurethane (PU) for increased wear resistance, or nitrile rubber (NBR) for good flexibility and fluid compatibility.

Key Characteristics:

  • Suitable for both piston and rod applications

  • Made from PU or NBR, depending on performance requirements

  • Compatible with closed groove designs

  • Simple groove geometry for ease of installation

  • Cost-effective solution for service and replacement

A wide range of standard sizes is available. Detailed performance specifications and installation guidelines can be found in the individual product descriptions.

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Groove Diameter D (mm)
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Manufacturers
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Photo Code Name Producer Stock
Rod-Piston seal K21 40x50x10 K21-040/2 PU Rod-Piston seal K21 40x50x10 Kastas 11
Rod-Piston seal K21 40x50x10 NBR K21-040/2 NBR Rod-Piston seal K21 40x50x10 NBR Kastas 16
Rod-Piston seal K21 40x50x5 K21-040/10 PU Rod-Piston seal K21 40x50x5 Kastas 11
Rod-Piston seal K21 40x50x6 K21-040/1 PU Rod-Piston seal K21 40x50x6 Kastas 22
Rod-Piston seal K21 40x50x6 NBR K21-040/1 NBR Rod-Piston seal K21 40x50x6 NBR Kastas 14
Rod-Piston seal K21 40x50x7 NBR K21-040/7 NBR Rod-Piston seal K21 40x50x7 NBR Kastas 21
Rod-Piston seal K21 40x50x7 PU K21-040/7 PU Rod-Piston seal K21 40x50x7 PU Kastas 13
Rod-Piston seal K21 40x50x8 K21-040/11 PU Rod-Piston seal K21 40x50x8 Kastas 21
Rod-Piston seal K21 40x52x6 K21-040/16 PU Rod-Piston seal K21 40x52x6 Kastas 12
Rod-Piston seal K21 40x55x10 K21-040 PU Rod-Piston seal K21 40x55x10 Kastas 17
Rod-Piston seal K21 40x55x7 K21-040/15 PU Rod-Piston seal K21 40x55x7 Kastas 17
Rod-Piston seal K21 40x56x10 K21-040/8 PU Rod-Piston seal K21 40x56x10 Kastas 16
Rod-Piston seal K21 40x60x10 K21-040/4 PU Rod-Piston seal K21 40x60x10 Kastas 10
Rod-Piston seal K21 40x60x12 K21-040/5 PU Rod-Piston seal K21 40x60x12 Kastas 9
Rod-Piston seal K21 40x60x12 NBR K21-040/5 NBR Rod-Piston seal K21 40x60x12 NBR Kastas 13
Rod-Piston seal K21 40x65x10 K21-040/12 PU Rod-Piston seal K21 40x65x10 Kastas 10
Rod-Piston seal K21 40x65x12 PU K21-040/19 PU Rod-Piston seal K21 40x65x12 PU Kastas 11
Rod-piston seal K21-40x50x9 K21-040/6 PU Rod-piston seal K21-40x50x9 Kastas 2
Rod-Piston seal K21-40x52x12 NBR K21-040/3 NBR Rod-Piston seal K21-40x52x12 NBR Kastas 5
Rod-Piston seal K36 40x48x6,3 K36-040 Rod-Piston seal K36 40x48x6,3 Kastas 13
Rod-Piston seal K36 40x48x8 K36-040/2 Rod-Piston seal K36 40x48x8 Kastas 12
Rod-Piston seal K36 40x50x11 K36-040/6 Rod-Piston seal K36 40x50x11 Kastas 11
Rod-Piston seal K36 40x60x14,5 K36-040/5 Rod-Piston seal K36 40x60x14,5 Kastas 14
Rod-piston seal MACMA 32x40x4 M4 4032 PUR95 25A211P5 Rod-piston seal MACMA 32x40x4 M4 4032 PUR95 MACMA request
Rod-Piston seal RPS 40x50x10 C0 [2ERPS322] RPS 0400 0500 100 C0 Rod-Piston seal RPS 40x50x10 C0 [2ERPS322] Artic seals 50
Rod-Piston seal RPS 40x50x5 C0 [2ERPS309] RPS 0400 0500 050 C0 Rod-Piston seal RPS 40x50x5 C0 [2ERPS309] Artic seals 129
Rod-Piston seal RPS 40x50x6 PU RPS 0400 0500 060 C0 Rod-Piston seal RPS 40x50x6 PU Artic seals 136
Rod-Piston seal RPS 40x50x6,5 C0 [2ERPS313] RPS 0400 0500 065 C0 Rod-Piston seal RPS 40x50x6,5 C0 [2ERPS313] Artic seals 6 weeks
Rod-Piston seal RPS 40x50x7 PU RPS 0400 0500 070 C0 Rod-Piston seal RPS 40x50x7 PU Artic seals 53
Rod-Piston seal RPS 40x50x8 C0 [2ERPS319] RPS 0400 0500 080 C0 Rod-Piston seal RPS 40x50x8 C0 [2ERPS319] Artic seals 26
Rod-Piston seal RPS 40x52x10 C0 [2ERPS325] RPS 0400 0520 100 C0 Rod-Piston seal RPS 40x52x10 C0 [2ERPS325] Artic seals 6 weeks
Rod-Piston seal RPS 40x55x10 C0 [2ERPS328] RPS 0400 0550 100 C0 Rod-Piston seal RPS 40x55x10 C0 [2ERPS328] Artic seals 87
Rod-Piston seal RPS 40x56x10 C0 [2ERPS331] RPS 0400 0560 100 C0 Rod-Piston seal RPS 40x56x10 C0 [2ERPS331] Artic seals 6 weeks
Rod-Piston seal RPS 40x60x10 C0 [2ERPS334] RPS 0400 0600 100 C0 Rod-Piston seal RPS 40x60x10 C0 [2ERPS334] Artic seals 20
Rod-Piston seal RPS 40x60x13 C0 [2ERPS337] RPS 0400 0600 130 C0 Rod-Piston seal RPS 40x60x13 C0 [2ERPS337] Artic seals 6 weeks
Rod-piston seal TTU 40x50x5 NBR 999921 Rod-piston seal TTU 40x50x5 NBR Italy request
Rod-piston seal TTU 40x50x5 PU 999784 Rod-piston seal TTU 40x50x5 PU Italy request
Rod-piston seal UP 40x50x6 PU 48006110 Rod-piston seal UP 40x50x6 PU Aston seals 50
Rod-piston seal 41,28x50,8x9,52 UPN PU 48004653 Rod-piston seal 41,28x50,8x9,52 UPN PU Aston seals 38
Rod-piston seal UP 41,27x50,8x9,52 PU 48003326 Rod-piston seal UP 41,27x50,8x9,52 PU Aston seals request
Rod seal K36 42x50x6,3 K36-042 Rod seal K36 42x50x6,3 Kastas 5
Rod-piston seal 42x53x10 A101 PU A101-042/8 PU Rod-piston seal 42x53x10 A101 PU ALP 34
Rod-piston seal A101 42x52x10 PU A101-042/5 PU Rod-piston seal A101 42x52x10 PU ALP 14
Rod-Piston seal K21 42x50x5 PU K21-042/1 PU Rod-Piston seal K21 42x50x5 PU Kastas 42
Rod-Piston seal K21 42x50x6 K21-042/8 PU Rod-Piston seal K21 42x50x6 Kastas 12
Rod-Piston seal K21 42x50x8 K21-042/5 PU Rod-Piston seal K21 42x50x8 Kastas 14
Rod-Piston seal K21 42x50x8 NBR K21-042/5 NBR Rod-Piston seal K21 42x50x8 NBR Kastas 17
Rod-Piston seal K21 42x52x10 K21-042/7 PU Rod-Piston seal K21 42x52x10 Kastas 7
Rod-Piston seal K21 42x55x8 NBR K21-042/4 NBR Rod-Piston seal K21 42x55x8 NBR Kastas 29
Rod-Piston seal K21 42x57x8 K21-042/3 PU Rod-Piston seal K21 42x57x8 Kastas 7
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