Mechanical Tolerance Chart Data. The following Engineering calculator will show the plus and minus tolerance for the specific ISO 286 Shaft tolerance data. Enter your desired preferred tolerance grade and the nomial size. Also see Table of Hole Tolerances per. Preferred tolerance grade ISO 286; International Tolerance Grades. ISO Tolerances for Shafts (ISO 286-2) Nominal Shaft Sizes (mm) over 3. Comparision table Alu comparison table Carbide equivalent chart. Inch - metri Conversion Charts Periodic Table of elements.
The Rubber Manufacturers Association (RMA) has developed tolerance tables with ranges to provide communication between user and provider across a wide range of industries. These are helpful when designing and producing a part. You can also consult the RMA article on factors affecting tolerances of molded rubber products.
- RMA Molded Tolerances
- RMA Extrusion Tolerances
- Table 12.
Summary of RMA Drawing Designations Extruded Rubber Products - Table 13.
Standard Cross-Sectional Tolerance - Table 16.
Cut Length tolerance for unspliced extrusion - Table 18.
Spliced Length Tolerances - Table 20.
Tolerances on Internal Dimensions of Mandrel-Supported Extrusions
Metric Tolerances (mm)
| Nominal Dimension | A1 | A2 | A3 | A4 |
| above | up to and
including | Fixed | Closure | Fixed | Closure | Fixed | Closure | Fixed | Closure |
| 0 | 10 | 0.1 | 0.13 | 0.16 | 0.2 | 0.2 | 0.32 | 0.32 | 0.8 |
| 10 | 16 | 0.13 | 0.16 | 0.2 | 0.25 | 0.25 | 0.4 | 0.4 | 0.9 |
| 16 | 25 | 0.16 | 0.2 | 0.2 | 0.32 | 0.32 | 0.5 | 0.5 | 1 |
| 25 | 40 | 0.2 | 0.25 | 0.32 | 0.4 | 0.4 | 0.63 | 0.63 | 1.12 |
| 40 | 63 | 0.25 | 0.32 | 0.4 | 0.5 | 0.5 | 0.8 | 0.8 | 1.25 |
| 63 | 100 | 0.32 | 0.4 | 0.5 | 0.63 | 0.63 | 1 | 1.1 | 1.4 |
| 100 | 160 | 0.4 | 0.5 | 0.63 | 0.8 | 0.8 | 1.25 | 1.25 | 1.6 |
160 & over
(Multiply by) | x .004 | x .005 | x .005 | x .008 | x .008 | x .010 |
Inch Tolerances (in)
| Nominal Dimension | A1 | A2 | A3 | A4 |
| above | up to and
including | Fixed | Closure | Fixed | Closure | Fixed | Closure | Fixed | Closure |
| 0 | 0.40 | 0.004 | 0.005 | 0.006 | 0.008 | 0.008 | 0.013 | 0.013 | 0.032 |
| 0.40 | 0.63 | 0.005 | 0.006 | 0.008 | 0.010 | 0.010 | 0.016 | 0.016 | 0.036 |
| 0.63 | 1.00 | 0.006 | 0.006 | 0.010 | 0.013 | 0.013 | 0.020 | 0.020 | 0.040 |
| 1.00 | 1.60 | 0.008 | 0.010 | 0.013 | 0.016 | 0.016 | 0.025 | 0.025 | 0.045 |
| 1.60 | 2.50 | 0.010 | 0.013 | 0.016 | 0.020 | 0.020 | 0.032 | 0.032 | 0.050 |
| 2.50 | 4.00 | 0.013 | 0.016 | 0.020 | 0.025 | 0.025 | 0.040 | 0.040 | 0.056 |
| 4.00 | 6.30 | 0.016 | 0.020 | 0.025 | 0.032 | 0.032 | 0.050 | 0.050 | 0.063 |
6.30 & over
(Multiply by) | x .004 | x .005 | x .005 | x .008 | x .008 | x .010 |
Table 12. Summary of RMA Drawing
Designations Extruded Rubber Products
| RMA Class | Dimensional Tolerance* Table 13 | CutLength Tolerance* Table 16 | SplicedLength Tolerance* Table 16 | MandrelCured* Table 20 |
| 1 | E1 | L1 | S1 | EN1 |
| 2 | E2 | L2 | S2 | EN2 |
| 3 | E3 | L3 | S3 | EN3 |
| 4 | – | – | – | – |
Table 13. Standard Cross-Sectional Tolerance
RMA Class |
| Drawing Designation | |
| Dimensions (in Millimeters) |
| Above | Up to and including | | 0 | 1.5 | | 1.5 | 2.5 | | 2.5 | 4.0 | | 4.0 | 6.3 | | 6.3 | 10 | | 10 | 16 | | 16 | 25 | | 25 | 40 | | 40 | 63 | | 63 | 100 |
|
| | +0.15 | +0.25 | +0.40 | | 0.20 | 0.35 | 0.50 | | 0.25 | 0.40 | 0.70 | | 0.35 | 0.50 | 0.80 | | 0.40 | 0.70 | 1.00 | | 0.50 | 0.80 | 1.30 | | 0.70 | 1.00 | 1.60 | | 0.80 | 1.30 | 2.00 | | 1.00 | 1.60 | 2.50 | | 1.30 | 2.00 | 3.20 |
|
RMA Class |
| Drawing Designation | |
| Dimensions (in Inches) |
| Above | Up to and including | | 0 | 0.06 | | 0.06 | 0.10 | | 0.10 | 0.16 | | 0.16 | 0.25 | | 0.25 | 0.39 | | 0.39 | 0.63 | | 0.63 | 0.98 | | 0.98 | 1.57 | | 1.57 | 2.48 | | 2.48 | 3.94 |
| | +0.006 | +0.010 | +0.015 | | 0.008 | 0.014 | 0.020 | | 0.010 | 0.016 | 0.027 | | 0.014 | 0.020 | 0.031 | | 0.016 | 0.027 | 0.039 | | 0.020 | 0.031 | 0.051 | | 0.027 | 0.039 | 0.063 | | 0.031 | 0.051 | 0.079 | | 0.039 | 0.063 | 0.098 | | 0.051 | 0.079 | 0.126 |
|
Table 16. Cut Length tolerance for unspliced extrusion
RMA Class |
| Drawing Designation. | |
| Length (in Millimeters) |
| Above | Up to and including | | 0 | 40 | | 40 | 63 | | 63 | 100 | | 100 | 160 | | 160 | 250 | | 250 | 400 | | 400 | 630 | | 630 | 1000 | | 1000 | 1600 | | 1600 | 2500 | | 2500 | 4000 | | 4000 |
| | +0.7 | +0.04 | +1.6 | | 0.08 | 1.3 | 2.0 | | 1.0 | 1.6 | 2.5 | | 1.3 | 2.0 | 3.2 | | 1.6 | 2.5 | 4.0 | | 2.0 | 3.2 | 5.0 | | 2.5 | 4.0 | 6.3 | | 3.2 | 5.0 | 10.0 | | 4.0 | 6.3 | 12.5 | | 5.0 | 10.0 | 16.0 | | 6.3 | 12.5 | 20.0 | | 0.16% | 0.32% | 0.50% |
|
| Length (in Inches) |
| Above | Up to and including | | 0 | 1.6 | | 1.6 | 2.5 | | 2.5 | 4.0 | | 4.0 | 6.3 | | 6.3 | 10.0 | | 10.0 | 16.0 | | 16.0 | 25.0 | | 25.0 | 40.0 | | 40.0 | 63.0 | | 63.0 | 100.0 | | 100.0 | 160.0 | | 160.0 |
| | +0.03 | +0.04 | +0.06 | | 0.03 | 0.05 | 0.08 | | 0.04 | 0.06 | 0.10 | | 0.05 | 0.08 | 0.13 | | 0.06 | 0.10 | 0.16 | | 0.8 | 0.13 | 0.20 | | 0.10 | 0.16 | 0.25 | | 0.13 | 0.20 | 0.40 | | 0.16 | 0.25 | 0.50 | | 0.20 | 0.40 | 0.63 | | 0.25 | 0.50 | 0.80 | | 0.16% | 0.32% | 0.50% |
|
Table 18. Spliced Length Tolerances
Tolerance Table In Inch Calculator
RMA
Class |
| Drawing Designation | |
| Millimeters |
| Above | Up to and including | | 0 | 250 | | 250 | 400 | | 400 | 630 | | 630 | 1000 | | 1000 | 1600 | | 1600 | 2500 | | 2500 | over |
| | +302 | +3.2 | +7.1 | | 4.0 | 7.1 | 8.0 | | 5.0 | 8.0 | 9.0 | | 6.3 | 9.0 | 10.0 | | 8.0 | 10.0 | 11.2 | | 10.0 | 11.2 | 12.3 | | 012.5 | 12.5 | 16.0 |
|
| Inches |
| Above | Up to and including | | 0 | 10 | | 10 | 16 | | 16 | 25 | | 25 | 40 | | 40 | 63 | | 63 | 100 | | 100 | over |
| | +.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 |
| Drawing Designation | |
Nominal Dimensions
(in Millimeters) |
| Above | Up to and including | | 0 | 4 | | 4 | 6.3 | | 6.3 | 10 | | 10 | 16 | | 16 | 25 | | 25 | 40 | | 40 | 63 | | 63 | 100 | | 100 | 160 | | 160 |
| | +0.20 | +0.20 | +0.35 | | 0.20 | 0.25 | 0.40 | | 0.25 | 0.35 | 0.50 | | 0.35 | 0.40 | 0.70 | | 0.40 | 0.50 | 0.80 | | 0.50 | 0.70 | 1.00 | | 0.70 | 0.80 | 1.30 | | 0.80 | 1.00 | 1.60 | | 1.00 | 1.30 | 2.00 | | 0.6% | 0.8% | 1.2% |
|
Nominal Dimensions
(in Inches) |
| Above | Up to and including | | 0 | 0.16 | | 0.16 | 0.25 | | 0.25 | 0.40 | | 0.40 | 0.63 | | 0.63 | 1.00 | | 1.00 | 1.60 | | 1.60 | 2.50 | | 2.50 | 4.00 | | 4.00 | 6.30 | | 6.30 |
| | +0.008 | +0.08 | +0.014 | | 0.008 | 0.010 | 0.016 | | 0.010 | 0.014 | 0.020 | | 0.014 | 0.016 | 0.028 | | 0.016 | 0.020 | 0.032 | | 0.020 | 0.028 | 0.040 | | 0.028 | 0.032 | 0.051 | | 0.032 | 0.040 | 0.063 | | 0.040 | 0.051 | 0.079 | | 0.6% | 0.8% | 1.2% |
|
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