Metric Size,
O-Rings
Nitrile-Butadiene-Rubber
OR638


RoHS Compliant
DIN1041 DIN1041

Specification
O rings: Black Nitrile-Butadiene-Rubber (NBR)
Hardness: Shore A 70 +/-5

  Information
Tensile strength: psi 2030 (min).
Ultimate elongation %: 250 (min).
Recommended service temperature: -40°F - 212°F
(-40°C to 100°C).
Metric O-rings according to DIN 3771 except when otherwise noted in table below.
Complete O-ring mold chart begins here, see for other sizes available upon request.
 
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Dimensions in:

(millimeters)

Part Number
ID
(Interior Diameter) (tol.)
CS
(Cross Section) (tol.)
Type
Size Code
2.50 (±0.13)
1.00 (±0.08)
   
3.00 (±0.13)
1.00 (±0.08)
   
3.50 (±0.13)
1.00 (±0.08)
   
4.00 (±0.13)
1.00 (±0.08)
   
4.50 (±0.13)
1.00 (±0.08)
   
5.00 (±0.13)
1.00 (±0.08)
   
6.50 (±0.13)
1.00 (±0.08)
   
7.00 (±0.13)
1.00 (±0.08)
   
8.00 (±0.13)
1.00 (±0.08)
   
9.00 (±0.13)
1.00 (±0.08)
   
10.00 (±0.13)
1.00 (±0.08)
   
25.00 (±0.25
1.00 (±0.08)
   
3.00 (±0.13)
1.50 (±0.08)
   
3.50 (±0.13)
1.50 (±0.08)
   
4.00 (±0.13)
1.50 (±0.08)
   
5.00 (±0.13)
1.50 (±0.08)
   
6.00 (±0.13)
1.50 (±0.08)
   
6.50 (±0.13)
1.50 (±0.08)
   
Part Number
ID
(Interior Diameter) (tol.)
CS
(Cross Section) (tol.)
Type
Size Code
7.00 (±0.13)
1.50 (±0.08)
   
9.00 (±0.13)
1.50 (±0.08)
   
10.00 (±0.13)
1.50 (±0.08)
   
13.00 (±0.15)
1.50 (±0.08)
   
14.00 (±0.15)
1.50 (±0.08)
   
15.00 (±0.18)
1.50 (±0.08)
   
23.00 (±0.23)
1.50 (±0.08)
   
25.00 (±0.25)
1.50 (±0.08)
   
35.00 (±0.30)
1.50 (±0.08)
   
36.00 (±0.36)
1.50 (±0.08)
   
39.00 (±0.36)
1.50 (±0.08)
   
45.00 (±0.41)
1.50 (±0.08)
   
4.10 (±0.13)
1.60 (±0.08)
   
16.10 (±0.18)
1.60 (±0.08)
   
37.10 (±0.36)
1.60 (±0.08)
   
6.75 (±0.13)
1.78 (±0.08)
BS 1806
-610
8.73 (±0.13)
1.78 (±0.08)
BS 1806
-611
98.05 (±0.71)
1.78 (±0.08)
BS 1806
-538
Part Number
ID
(Interior Diameter) (tol.)
CS
(Cross Section) (tol.)
Type
Size Code
3.00 (±0.13)
2.00 (±0.08)
   
4.00 (±0.13)
2.00 (±0.08)
   
5.00 (±0.13)
2.00 (±0.08)
   
6.00 (±0.13)
2.00 (±0.08)
   
7.00 (±0.13)
2.00 (±0.08)
   
7.50 (±0.13)
2.00 (±0.08)
   
9.00 (±0.13)
2.00 (±0.08)
   
10.00 (±0.13)
2.00 (±0.08)
   
11.00 (±0.13)
2.00 (±0.08)
   
12.00 (±0.15)
2.00 (±0.08)
   
13.00 (±0.15)
2.00 (±0.08)
   
14.00 (±0.15)
2.00 (±0.08)
   
17.00 (±0.18)
2.00 (±0.08)
   
20.00 (±0.20)
2.00 (±0.08)
   
21.00 (±0.23)
2.00 (±0.08)
   
22.00 (±0.23)
2.00 (±0.08)
   
23.00 (±0.23)
2.00 (±0.08)
   
26.00 (±0.25)
2.00 (±0.08)
   
42.00 (±0.36)
2.00 (±0.08)
   
Part Number
ID
(Interior Diameter) (tol.)
CS
(Cross Section) (tol.)
Type
Size Code
45.00 (±0.41)
2.00 (±0.08)
   
50.00 (±0.41)
2.00 (±0.08)
   
52.00 (±0.46)
2.00 (±0.08)
   
53.00 (±0.46)
2.00 (±0.08)
   
54.00 (±0.46)
2.00 (±0.08)
   
56.00 (±0.46)
2.00 (±0.08)
   
58.00 (±0.46)
2.00 (±0.08)
   
64.00 (±0.51)
2.00 (±0.08)
   
74.00 (±0.56)
2.00 (±0.08)
   
76.00 (±0.61)
2.00 (±0.08)
   
5.30 (±0.13)
2.40 (±0.08)
   
8.30 (±0.13)
2.40 (±0.08)
   
9.30 (±0.13)
2.40 (±0.08)
   
9.80 (±0.13)
2.40 (±0.08)
   
11.30 (±0.13)
2.40 (±0.08)
   
11.80 (±0.15
2.40 (±0.08)
   
16.30 (±0.18
2.40 (±0.08)
   
17.30 (±0.18
2.40 (±0.08)
   
19.60 (±0.20
2.40 (±0.08)
   
Part Number
ID
(Interior Diameter) (tol.)
CS
(Cross Section) (tol.)
Type
Size Code
4.00 (±0.13)
2.50 (±0.08)
   
5.00 (±0.13)
2.50 (±0.08)
   
7.00 (±0.13)
2.50 (±0.08)
   
8.00 (±0.13)
2.50 (±0.08)
   
10.00 (±0.13)
2.50 (±0.08)
   
10.50 (±0.13)
2.50 (±0.08)
   
11.00 (±0.13)
2.50 (±0.08)
   
12.00 (±0.15)
2.50 (±0.08)
   
13.00 (±0.15)
2.50 (±0.08)
   
15.00 (±0.18)
2.50 (±0.08)
   
16.00 (±0.18)
2.50 (±0.08)
   
19.00 (±0.20)
2.50 (±0.08)
   
25.00 (±0.25)
2.50 (±0.08)
   
48.00 (±0.41)
2.50 (±0.08)
   
51.00 (±0.46)
2.50 (±0.08)
   
20.00 (±0.20)
2.65 (±0.08)
   
4.00 (±0.13)
3.00 (±0.10)
   
9.00 (±0.13)
3.00 (±0.10)
   
Part Number
ID
(Interior Diameter) (tol.)
CS
(Cross Section) (tol.)
Type
Size Code
10.00 (±0.13)
3.00 (±0.10)
   
12.00 (±0.15)
3.00 (±0.10)
   
15.00 (±0.18)
3.00 (±0.10)
   
20.00 (±0.20)
3.00 (±0.10)
   
22.00 (±0.23)
3.00 (±0.10)
   
24.00 (±0.25)
3.00 (±0.10)
   
25.00 (±0.25)
3.00 (±0.10)
   
26.00 (±0.25)
3.00 (±0.10)
   
30.00 (±0.30)
3.00 (±0.10)
   
32.00 (±0.30)
3.00 (±0.10)
   
34.00 (±0.30)
3.00 (±0.10)
   
40.00 (±0.36)
3.00 (±0.10)
   
44.00 (±0.41)
3.00 (±0.10)
   
44.20 (±0.41)
3.00 (±0.10)
   
50.00 (±0.41)
3.00 (±0.10)
   
Part Number
ID
(Interior Diameter) (tol.)
CS
(Cross Section) (tol.)
Type
Size Code
52.00 (±0.46)
3.00 (±0.10)
   
54.00 (±0.46)
3.00 (±0.10)
   
55.00 (±0.46)
3.00 (±0.10)
   
62.00 (±0.51)
3.00 (±0.10)
   
68.00 (±0.56)
3.00 (±0.10)
   
69.00 (±0.56)
3.00 (±0.10)
   
80.00 (±0.61)
3.00 (±0.10)
   
84.50 (±0.66)
3.00 (±0.10)
   
8.00 (±0.13)
3.50 (±0.10)
   
35.00 (±0.30)
3.50 (±0.10)
   
42.86 (±0.36)
3.53 (±0.10)
BS 1806
-826
55.56 (±0.46)
3.53 (±0.10)
BS 1806
-834
71.44 (±0.56)
3.53 (±0.10)
BS 1806
-844
40.00 (±0.36)
4.00 (±0.13)
   
52.00 (±0.46)
4.00 (±0.13)
   
390.00 (±2.03)
4.00 (±0.13)
   
32.00 (±0.30)
5.00 (±0.13)
   
45.00 (±0.41)
5.00 (±0.13)
   
55.00 (±0.46)
5.00 (±0.13)
   
80.00 (±0.61)
5.00 (±0.13)