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RMA Tolerance Chart

Metric Tolerances (mm)

Nominal Dimension A1 A2 A3 A4 
aboveup to andincludingFixedClosureFixedClosureFixedClosureFixedClosure
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 Dimension A1 A2 A3 A4 
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
-----

Table 13. Standard Cross-Sectional Tolerance

RMA Class 1 - High Precision2 - Precision3 - Commercial
Drawing DesignationE1E2E3
Dimensions (in Millimeters)
AboveUp to and including
01.5+0.15+0.25+0.4
1.52.50.200.350.50
2.540.250.400.70
46.30.350.500.80
6.3100.400.701.00
10160.500.801.30
16250.701.001.60
25400.801.302.00
40631.001.602.50
631001.302.003.20
RMA Class1 - High Precision2 - Precision3 - Commercial
Drawing DesignationE1E2E3
Dimensions (in Inches)
AboveUp to and including
00.06+0.006+0.010+0.015
0.060.100.0080.0140.020
0.100.160.0100.0160.027
0.160.250.0140.0200.031
0.250.390.0160.0270.039
0.390.630.0200.0310.051
0.630.980.0270.0390.063
0.981.570.0310.0510.079
1.572.480.0390.0630.098
2.483.940.0510.0790.126

Table 16. Cut Length tolerance for unspliced extrusion

1 - HighPrecision  2 -Precision  3 - Commercial    
Drawing Designation.L1L2L3
Length (in Millimeters)
AboveUp to and including
040+0.7+0.04+1.6
40630.081.32.0
631001.01.62.5
1001601.32.03.2
1602501.62.54.0
2504002.03.25.0
4006302.54.06.3
63010003.25.010.0
100016004.06.312.5
160025005.010.016.0
250040006.312.520.0
40000.16%0.32%0.50%
Length (in Inches)
AboveUp to and including
11.6+0.03+0.04+0.06
1.62.50.030.050.08
2.540.040.060.10
46.30.050.080.13
6.3100.060.100.16
10160.80.130.20
16250.100.160.25
25400.130.200.40
40630.160.250.50
631000.200.400.63
1001600.250.500.80
1600.16%0.32%0.50%

Table 18. Spliced Length Tolerances

RMA
Class
 1 - High Precision2 - Precision3 - Commercial
Drawing DesignationS1S2S3
Millimeters
AboveUp to and including
0250+302+3.2+7.1
2504004.07.18.0
4006305.08.09.0
63010006.39.010.0
100016008.010.011.2
1600250010.011.212.3
2500over012.512.516.0
Inches
AboveUp to and including
010+.13+.25+.28
1016.16.28.32
1625.20.32.36
2540.25.36.40
4063.32.40.45
63100.40.45.50
100over.50.50.53

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

RMA
Class
 1 - High Precision2 - Commercial3 - Non-Critical
Drawing DesignationEN1EN2EN3
Nominal Dimensions
(in Millimeters)
AboveUp to and including
04+0.20+0.20+0.35
46.30.200.250.40
6.3100.250.350.50
10160.350.400.70
16250.400.500.80
25400.500.701.00
40630.700.801.30
631000.801.001.60
1001601.001.302.00
1600.6%0.8%1.2%
Nominal Dimensions
(in Inches)
AboveUp to and including
00.16+0.008+0.08+0.014
0.160.250.0080.0100.016
0.250.400.0100.0140.020
0.40.630.0140.0160.028
0.631.000.0160.0200.032
1.001.60.0200.0280.040
1.62.50.0280.0320.051
2.54.000.0320.0400.063
4.006.300.0400.0510.079
6.300.6%0.8%1.2%

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