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Home  > PRODUCTS  > O-RINGS  >  NBR Nitrile rubber Buna-N o ring
NBR Nitrile rubber Buna-N  o ring

NBR Nitrile rubber Buna-N o ring

Diameter Range
Unlimited
Pressure Range
40MPa
Temperature Range
-30℃ +100℃
Speed
2m/s
Medium
water, oil

1. Installation Recommendation 


2. Application and properties

Double acting seals, the sealing effect is achieved by the deformation of the section of the O-Rings, and the deformation is determined by the depth of the installation groove. Under pressure, the O-ring has a large surface tension like liquid, used for static sealing more. It is only recommended for better conditions in dynamic applications. System lubrication, pressure, temperature, sealing clearance, speed, medium and surface quality of metal parts determine the service life of O-Rings. It is not recommended if the lubrication is not sufficient during rotary motion.


3. Standard materials

NBR / FKM


4. Performance parameter


Static Seal

Dynamic Seal

Working Pressure

No support ring, up to 20MPa;

With the support ring, up to 40MPa;

With special support ring, up to 200MPa.

No support ring, up to 5MPa;

With the support ring, higher pressure.

Movement Speed

Maximum reciprocating speed up to 0.5m / s; maximum rotation speed up to 2.0m/s.

Temperature

NBR: -30℃ - 100℃;  FKM: -20℃ - 220℃.


5. Wire Diameter Tolerance

Wire diameter of O-Ring (mm)

Tolerance (±mm)

0-1.8

0.08

1.80-2.65

0.09

2.65-3.55

0.10

3.55-5.30

0.13

5.30-7.00

0.15

7.00-8.00

0.18

8.00-10.00

0.21

10.00-12.00

0.25

 

6. Inner diameter tolerance

Inner Diameter

d1 mm

Tolerance

±mm

Inner Diameter

d1 mm

Tolerance

±mm

Inner Diameter

d1 mm

Tolerance

±mm

0.70-2.50

2.50-4.50

4.50-6.30

0.13

0.14

0.15

43.70-45.00

46.00-46.20

46.20-47.50

0.42

0.43

0.44

95.00-97.50

97.50-100.00

100.00-103.00

0.83

0.84

0.87

6.30-8.50

8.50-10.00

10.00-11.20

0.16

0.17

0.18

47.50-48.70

48.70-50.00

50.00-51.50

0.45

0.46

0.47

103.00-106.00

106.00-109.00

109.00-112.00

0.89

0.91

0.93

11.20-14.00

14.00-16.00

16.00-18.00

0.19

0.20

0.21

51.50-53.00

53.00-54.50

54.50-56.00

0.48

0.50

0.51

112.00-115.00

115.00-118.00

118.00-122.00

0.95

0.97

1.00

18.00-20.00

20.00-21.20

21.20-23.60

0.22

0.23

0.24

56.00-58.00

58.00-60.00

60.00-61.50

0.52

0.54

0.55

122.00-125.00

125.00-128.00

128.00-132.00

1.03

1.05

1.08

23.60-25.00

25.00-26.50

26.50-28.00

0.25

0.26

0.28

61.50-63.00

63.00-65.00

65.00-67.00

0.56

0.58

0.59

132.00-136.00

136.00-140.00

140.00-145-00

1.10

1.13

1.17

28.00-30.00

30.00-31.50

31.50-33.50

0.29

0.31

0.32

67.00-69.00

69.00-71.00

71.00-73.00

0.61

0.63

0.64

145.00-150.00

150.00-155.00

155.00-160.00

1.20

1.24

1.27

33.50-34.50

34.50-35.50

35.50-36.50

0.33

0.34

0.35

73.00-75.00

75.00-77.50

77.50-80.00

0.66

0.67

0.69

160.00-165.00

165.00-170.00

170.00-175.00

1.31

1.34

1.38

36.50-37.50

37.50-38.70

38.70-40.00

0.36

0.37

0.38

80.00-82.50

82.50-85.00

85.00-87.50

0.71

0.73

0.75

175.00-180.00

180.00-185.00

185.00-190.00

1.41

1.44

1.48

40.00-41.20

41.20-42.50

42.50-43.70

0.39

0.40

0.41

87.50-90.00

90.00-92.50

92.50-95.00

0.77

0.79

0.81

190.00-195.00

195.00-200.00

200.00-206.00

1.51

1.55

1.59

206.00-212.00

212.00-218.00

224.00-230.00

1.63

1.71

1.75

325.00-335.00

335.00-345.00

345.00-355.00

2.43

2.49

2.56

500.00-515.00

515.00-530.00

530.00-545.00

3.54

3.63

3.72

230.00-236.00

236.00-243.00

243.00-250.00

1.79

1.83

1.88

355.00-365.00

365.00-375.00

375.00-387.00

2.62

2.68

2.76

545.00-560.00

560.00-580.00

580.00-600.00

3.81

3.93

4.05

250.00-258.00

258.00-265.00

265.00-272.00

1.93

1.98

2.02

387.00-400.00

400.00-412.00

412.00-425.00

2.84

2.91

2.99

600.00-615.00

615.00-630.00

630.00-650.00

4.13

4.22

4.34

272.00-280.00

280.00-290.00

290.00-300.00

2.08

2.14

2.21

425.00-437.00

437.00-450.00

450.00-462.00

3.07

3.15

3.22

650.00-670.00

4.46

300.00-307.00

307.00-315.00

315.00-325.00

2.25

2.30

2.37

462.00-475.00

475.00-485.00

485.00-500.00

3.30

3.37

3.45




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