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.

Filter

Hydraulic seals dimension

Rod diameter d (mm)

Groove Diameter D (mm)

Seal width h (mm)

Details

Seal type

Manufacturers

38 ALP

19 Artic seals

37 Aston seals

41 GAPI

17 Italy

12 Kastas

30 OEM

20 Taiwan

25 Unknown

Photo	Code	Name	Producer	Stock
	K21-015/5 NBR	Rod-Piston seal K21 15x22x4 NBR	Kastas	26
	K21-015/11 NBR	Rod-Piston seal K21 15x22x5 NBR	Kastas	33
	K21-015/8 PU	Rod-Piston seal K21 15x25x10	Kastas	12
	K21-015/4 NBR	Rod-Piston seal K21 15x25x5 NBR	Kastas	24
	K21-015 PU	Rod-Piston seal K21 15x25x8	Kastas	21
	K21-015/12 PU	Rod-Piston seal K21 15x28x10	Kastas	27
	K21-015/2 PU	Rod-Piston seal K21 15x28x8 PU	Kastas	10
	K21-015/13 PU	Rod-Piston seal K21 15x30x10	Kastas	10
	K21-015/6 PU	Rod-Piston seal K21 15x30x6	Kastas	25
	K21-015/15 PU	Rod-Piston seal K21 15x30x8	Kastas	11
	K21-015/15 NBR	Rod-Piston seal K21 15x30x8 NBR	Kastas	24
	RPS 0150 0250 100 C0	Rod-Piston seal RPS 15x25x10 C0 [2ERPS112]	Artic seals	6 weeks
	RPS 0150 0250 080 C0	Rod-Piston seal RPS 15x25x8 C0 [2ERPS109]	Artic seals	6 weeks
	RPS 0150 0250 090 C0	Rod-Piston seal RPS 15x25x9 C0 [2ERPS717]	Artic seals	6 weeks
	K36-016	Rod seal K36 16x24x6,3	Kastas	32
	K36-016/1	Rod seal K36 16x24x6,5	Kastas	21
	K36-016/2	Rod seal K36 16x24x7	Kastas	5
		Rod-Piston seal 16x28x8 U2 88A	unknown	request
	K21-016/6 PU	Rod-Piston seal K21 16x22x3	Kastas	12
	K21-016/9 PU	Rod-Piston seal K21 16x22x4	Kastas	17
	K21-016/1 PU	Rod-Piston seal K21 16x22x5	Kastas	24
	K21-016/1 NBR	Rod-Piston seal K21 16x22x5 NBR	Kastas	12
	K21-016/5 NBR	Rod-Piston seal K21 16x24x4 NBR	Kastas	28
	K21-016/11 NBR	Rod-Piston seal K21 16x24x5,5 NBR	Kastas	10
	K21-016/13 PU	Rod-Piston seal K21 16x24x6	Kastas	20
	K21-016/10 PU	Rod-Piston seal K21 16x25x5	Kastas	15
	K21-016/10 NBR	Rod-Piston seal K21 16x25x5 NBR	Kastas	28
	K21-016/8 PU	Rod-Piston seal K21 16x26x5	Kastas	22
	K21-016/8 NBR	Rod-Piston seal K21 16x26x5 NBR	Kastas	40
	K21-016/2 PU	Rod-Piston seal K21 16x26x6	Kastas	27
	K21-016 PU	Rod-Piston seal K21 16x26x8	Kastas	18
	K21-016/16 PU	Rod-Piston seal K21 16x28x6	Kastas	21
	K21-016/7 PU	Rod-Piston seal K21 16x29x6	Kastas	13
	K21-016/19 PU	Rod-Piston seal K21-16x22x7 PU	Kastas	16
	K95-016 NBR	Rod-Piston seal K95 16x22x4 NBR	Kastas	13
	K95-016/1 NBR	Rod-Piston seal K95 16x22x6 NBR	Kastas	27
	K95-016/2 NBR	Rod-Piston seal K95 16x25x5 NBR	Kastas	12
	RPS 0160 0220 040 C0	Rod-Piston seal RPS 16x22x4 C0 [2ERPS115]	Artic seals	6 weeks
	RPS 0160 0220 045 C0	Rod-Piston seal RPS 16x22x4,5 C0 [2ERPS836]	Artic seals	6 weeks
	RPS 0160 0220 050 C0	Rod-Piston seal RPS 16x22x5 C0 [2ERPS118]	Artic seals	6 weeks
	RPS 0160 0240 050 C0	Rod-Piston seal RPS 16x24x5 C0 [2ERPS121]	Artic seals	6 weeks
	RPS 0160 0240 057 C0	Rod-Piston seal RPS 16x24x5,7 C0 [2ERPS124]	Artic seals	6 weeks
	RPS 0160 0240 070 C0	Rod-Piston seal RPS 16x24x7 C0 [2ERPS127]	Artic seals	6 weeks
	RPS 0160 0260 050 C0	Rod-Piston seal RPS 16x26x5 C0 [2ERPS130]	Artic seals	6 weeks
	RPS 0160 0260 080 C0	Rod-Piston seal RPS 16x26x8 C0 [2ERPS133]	Artic seals	6 weeks
	RPS 0160 0280 060 C0	Rod-Piston seal RPS 16x28x6 C0 [2ERPS136]	Artic seals	96
	K21-017/2 NBR	Rod-Piston seal K21 17x25x4 NBR	Kastas	12
	K21-017/1 PU	Rod-Piston seal K21 17x32x10	Kastas	10
	RPS 0170 0250 100 C0	Rod-Piston seal RPS 17x25x10 C0 [2ERPS139]	Artic seals	6 weeks
	RPS 0170 0250 040 C0	Rod-Piston seal RPS 17x25x4 C0 [2ERPS721]	Artic seals	35

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