Metric Tolerances (mm)

Nominal DimensionA1A2A3A4
aboveup to and
including
FixedClosureFixedClosureFixedClosureFixedClosure
0100.10.130.160.20.20.320.320.8
10160.130.160.20.250.250.40.40.9
16250.160.20.20.320.320.50.51
25400.20.250.320.40.40.630.631.12
40630.250.320.40.50.50.80.81.25
631000.320.40.50.630.6311.11.4
1001600.40.50.630.80.81.251.251.6
160 & over
(Multiply by)
x .004x .005x .005x .008x .008x .010

Inch Tolerances (in)

Nominal DimensionA1A2A3A4
aboveup to and
including
FixedClosureFixedClosureFixedClosureFixedClosure
00.400.0040.0050.0060.0080.0080.0130.0130.032
0.400.630.0050.0060.0080.0100.0100.0160.0160.036
0.631.000.0060.0060.0100.0130.0130.0200.0200.040
1.001.600.0080.0100.0130.0160.0160.0250.0250.045
1.602.500.0100.0130.0160.0200.0200.0320.0320.050
2.504.000.0130.0160.0200.0250.0250.0400.0400.056
4.006.300.0160.0200.0250.0320.0320.0500.0500.063
6.30 & over
(Multiply by)
x .004x .005x .005x .008x .008x .010

Table 12. Summary of RMA Drawing Designations Extruded Rubber Products

RMA ClassDimensional Tolerance* Table 13CutLength Tolerance* Table 16SplicedLength Tolerance* Table 16MandrelCured* Table 20
1E1L1S1EN1
2E2L2S2EN2
3E3L3S3EN3
4

Table 13. Standard Cross-Sectional Tolerance

RMA Class

1 – High Precision

2 – Precision

3 – Commercial

Drawing Designation
E1E2E3
Dimensions (in Millimeters)
AboveUp to
01.5
1.52.5
2.54.0
4.06.3
6.310
1016
1625
2540
4063
63100
+0.15+0.25+0.40
0.200.350.50
0.250.400.70
0.350.500.80
0.400.701.00
0.500.801.30
0.701.001.60
0.801.302.00
1.001.602.50
1.302.003.20

RMA Class

1 – High Precision2 – Precision3 – Commercial
Drawing Designation
E1E2E3
Dimensions (in Inches)
AboveUp to
00.06
0.060.10
0.100.16
0.160.25
0.250.39
0.390.63
0.630.98
0.981.57
1.572.48
2.483.94
+0.006+0.010+0.015
0.0080.0140.020
0.0100.0160.027
0.0140.0200.031
0.0160.0270.039
0.0200.0310.051
0.0270.0390.063
0.0310.0510.079
0.0390.0630.098
0.0510.0790.126

 

Table 16. Cut Length tolerance for unspliced extrusion

RMA Class

1 – HighPrecision2 – Precision3 – Commercial
Drawing Designation.
L1L2L3
Length (in Millimeters)
AboveUp to
040
4063
63100
100160
160250
250400
400630
6301000
10001600
16002500
25004000
4000
+0.7+0.04+1.6
0.081.32.0
1.01.62.5
1.32.03.2
1.62.54.0
2.03.25.0
2.54.06.3
3.25.010.0
4.06.312.5
5.010.016.0
6.312.520.0
0.16%0.32%0.50%
Length (in Inches)
AboveUp to
01.6
1.62.5
2.54.0
4.06.3
6.310.0
10.016.0
16.025.0
25.040.0
40.063.0
63.0100.0
100.0160.0
160.0
+0.03+0.04+0.06
0.030.050.08
0.040.060.10
0.050.080.13
0.060.100.16
0.80.130.20
0.100.160.25
0.130.200.40
0.160.250.50
0.200.400.63
0.250.500.80
0.16%0.32%0.50%

Table 18. Spliced Length Tolerances

RMA
Class

1 – High Precision2 – Precision3 – Commercial
Drawing Designation
S1S2S3
Millimeters
AboveUp to
0250
250400
400630
10001600
16002500
2500over
+302+3.2+7.1
4.07.18.0
5.08.09.0
6.39.010.0
8.010.011.2
10.011.212.3
012.512.516.0
Inches
AboveUp to
010
1016
1625
2540
4063
63100
100over
+.13+.25+.28
.16.28.32
.20.32.36
.25.36.40
.32.40.45
.40.45.50
.50.50.53

Table 20. Tolerances on Internal Dimensions of Mandrel-Supported Extrusions

RMA
Class

1
High Precision
2
Commercial
3
Non-Critical
Drawing Designation
EN1EN2EN3
Nominal Dimensions
(in Millimeters)
AboveUp to
04
46.3
6.310
1016
1625
2540
4063
63100
100160
160
+0.20+0.20+0.35
0.200.250.40
0.250.350.50
0.350.400.70
0.400.500.80
0.500.701.00
0.700.801.30
0.801.001.60
1.001.302.00
0.6%0.8%1.2%
Nominal Dimensions
(in Inches)
AboveUp to
00.16
0.160.25
0.250.40
0.400.63
0.631.00
1.001.60
1.602.50
2.504.00
4.006.30
6.30
+0.008+0.08+0.014
0.0080.0100.016
0.0100.0140.020
0.0140.0160.028
0.0160.0200.032
0.0200.0280.040
0.0280.0320.051
0.0320.0400.063
0.0400.0510.079
0.6%0.8%1.2%