Tolerances on cross-sectional dimensions of irregular and cored shapes of extruded, closed-cellular rubber. Class 1 Tolerances in the table below are recommended only for high volume, tight products, or automotive applications.
| RMA Class | 1*
| 2
| 3
|
|---|---|---|---|
| RMA Dwg. Designation | BEC1 |
BEC2 |
BEC3 |
| Millimeters | |||
| 0 - 6.3 | +/- 0.4 |
+/- 0.5 |
+/- 0.63 |
| 6.3 - 12.5 | 0.63 |
1 |
1.25 |
| 12.5 - 25 | 1.25 |
2 |
2.5 |
| 25 - 40 | 2 |
3.2 |
4 |
| 40 & Over multiply by: | 0.06 |
0.08 |
1 |
| Inches | |||
| 0 - 0.25 | +/- 0.016 |
+/- 0.020 |
+/- 0.025 |
| 0.25 - 0.5 | 0.025 |
0.04 |
0.05 |
| 0.5 - 1 | 0.05 |
0.08 |
0.1 |
| 1 - 1.6 | 0.08 |
0.125 |
0.16 |
| 1.6 & Over multiply by: | 0.06 |
0.08 |
0.1 |
Standards for cross-sectional tolerance table
RMA Class
| 1
| 2
| 3
| |
|---|---|---|---|---|
High Precision
| Precision
| Commercial
| ||
Drawing Designation
| E1
| E2
| E3
| |
Dimensions (mm)
| ||||
0 |
1.5 |
+/- 0.15 |
+/- 0.25 |
+/- 0.40 |
1.5 |
2.5 |
0.2 |
0.35 |
0.5 |
2.5 |
4 |
0.25 |
0.4 |
0.7 |
4 |
6.3 |
0.35 |
0.5 |
0.8 |
6.3 |
10 |
0.4 |
0.7 |
1 |
10 |
16 |
0.5 |
0.8 |
1.3 |
16 |
25 |
0.7 |
1 |
1.6 |
25 |
40 |
0.8 |
1.3 |
2 |
40 |
63 |
1 |
1.6 |
2.5 |
63 |
100 |
1.3 |
2 |
3.2 |
RMA Class
|
1
|
2
|
3
|
|
|---|---|---|---|---|
High Precision |
Precision
|
Commercial
|
||
Drawing Designation
|
E1
|
E2
|
E3
|
|
Dimensions (in)
|
||||
0 |
0.06 |
+/- 0.006 |
+/- 0.010 |
+/- 0.015 |
0.06 |
0.1 |
0.008 |
0.014 |
0.02 |
0.1 |
0.16 |
0.01 |
0.016 |
0.027 |
0.16 |
0.25 |
0.014 |
0.02 |
0.031 |
0.25 |
0.39 |
0.016 |
0.027 |
0.039 |
0.39 |
0.63 |
0.02 |
0.031 |
0.051 |
0.63 |
0.98 |
0.027 |
0.039 |
0.063 |
0.98 |
1.57 |
0.031 |
0.051 |
0.079 |
1.57 |
2.48 |
0.039 |
0.063 |
0.098 |
2.48 |
3.94 |
0.051 |
0.079 |
0.126 |
Standards for cross-sectional tolerance table
RESISTANT TO: | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| MATERIAL | Oil
| Elect
| Flame
| Impact
| Abras
| Tearing
| Weather
| Oxid
| Ozone
|
| EPDM | P
|
E
|
P
|
G
|
G
|
G
|
VG
|
E
|
E
|
| NBR (Nitrile) | E
|
P
|
P
|
G
|
G
|
F
|
P
|
G
|
F
|
| Neoprene | G
|
VG
|
G
|
G
|
E
|
G
|
VG
|
E
|
E
|
| Polyisoprene /Natural |
P
|
E
|
P
|
E
|
E
|
E
|
F
|
F
|
P
|
| SBR | P
|
G
|
P
|
E
|
VG
|
F
|
F
|
G
|
F
|
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