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O-ring

O-ring

I. Use

O-ring is a sealing part most extensively used in hydraulic and pneumatic transmission systems, and is applicable to various types of hydraulic and pneumatic systems and mechanical equipment and components. It provides static or dynamic sealing functions at given pressure and temperature and in various types of media. It has good sealing and vibration reducing effects in environments with oil, acid/alkali, abrasion and chemical corrosion. In some situations, O-ring also serves as static seal and dynamic seal in axial reciprocating motion and low-speed rotation.
 

II. Working temperature

-60°C~+300°C

 

III. Performance indicators

Pressure velocity:

Maximum allowable reciprocating velocity is 0.5m/s, in static situation. 

Where check ring is absent, its maximum allowable pressure is 20MPa and maximum rotation speed is 2.0m/s.

Where check ring is used, its maximum allowable pressure is 40MPa.

Where special check ring is used, its maximum allowable pressure is 200MPa.

Dynamic pressure

Maximum compression:

Where check ring is absent, maximum allowable pressure is 5MPa in reciprocating motion. Static seal: 20% of O-ring diameter.

Where check ring is used and high pressured is applied, dynamic seal: 30% of O-ring diameter.

 

IV. Type

Material

Temperature (°C)

Main feature

Remarks

Nitrile rubber

-40~+121

Oil resistant

Nitrile (Buna-N)

FKM

-26~+204

Good resistance to heat, strong corrosion and static electricity

FKM (VITON)

FKM

-28~+204

Good resistance to heat, strong corrosion and static electricity

AFLAS

EPR

-30~+150

Good resistance to heat and corrosion

EPDM

Silicone rubber

-43~+210

Good resistance to heat and static electricity

Silicone

Neoprene

-62~+232

Good resistance to abrasion and heat

Chloroprene(Neoprene)

Highly Saturated Butyronitrile

-40~+162

Good resistance to oil and heat

Highly Saturated Nitrile(HSN,HNBR)

PTFE

-100~+200

Good resistance to high/low temperature, strong corrosion and static electricity

(Teflon)

Polyurethane

-53~+93

Good resistance to abrasion and oil, nontoxic

Urethane (Polyurethane)

Fluorosilicone rubber

-62~+204

Good resistance to heat and corrosion

Fluorosilicone (FVMQ)

O-ring with external PTFE coating

 

FEP/silicone core

Shore Hardness (A±5°): 90
Temperature: -60°C~+205°C

FEP/FKM core

Shore Hardness (A±5°): 90
Temperature: -73°C~+205°C

 

V. Technical Specification

 

O-ring specifications: (GB3452.1-92)

I.D.

Cross-sectional diameter

I.D.

Cross-sectional diameter

1.80
±0.08

2.65
±0.09

3.55
±0.10

5.30
±0.13

7.00
±0.15

1.80
±0.08

2.65
±0.09

3.55
±0.10

5.30
±0.13

7.00
±0.15

I.D.

Tolerance

I.D.

Tolerance

1.80

±0.13

*

 

 

 

 

19.0

±0.22

*

*

*

 

 

2.00

*

20.0

*

*

*

2.24

*

21.2

*

*

*

2.50

*

22.4

*

*

*

2.80

*

23.6

*

*

*

3.15

*

25.0

*

*

*

3.55

*

26.5

*

*

*

3.75

*

28.0

*

*

*

4.00

*

30.0

*

*

*

4.50

*

31.5

±0.30

 

*

*

4.87

*

32.5

*

*

*

5.00

*

33.5

 

*

*

5.15

*

34.5

*

*

*

5.30

*

35.5

 

*

*

5.60

*

36.5

*

*

*

6.00

*

37.5

 

*

*

6.30

±0.14

*

38.7

*

*

*

6.70

*

40.0

 

*

*

*

6.90

*

41.2

±0.44

 

*

*

*

7.10

*

42.5

*

*

*

*

7.50

*

43.7

 

*

*

*

8.00

*

45.0

 

*

*

*

8.50

*

46.2

*

*

*

*

8.75

*

47.5

 

*

*

*

9.00

*

48.7

 

*

*

*

9.50

*

50.0

*

*

*

*

 

Note:  (GB1235-76) O-ring specifications are not included, please contact for details.

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