Extruded Rubber Tolerances
The use of extruded seals is extremely diverse. You will find extrusions in many types of manufacturing processes for a variety of purposes. Applications include but are not limited to: door and window seals in the architectural environment and automotive, appliance and aircraft industries; bearing seals; bumpers; heater gaskets; radiator overflow tubing; vacuum cleaner belts; ladder foot grips, and cushions on bars or handles. The applications are endless and expanding rapidly with innovative engineering of extrudable materials.
Materials which can be extruded include dense and sponge rubber from a variety of compounds to meet your specific environment and application. These compounds include Nitrile, EPDM, Natural rubber, Neoprene, Viton®, Urethane, Silicone and many others. Whether your application requires a long or short run, OneMonroe Seals will service your needs with the appropriate compound. Extrusions can be diversified for use by many secondary operations such as cut lengths, vulcanized to be endless, and formed and notched to allow a variety of shapes and sizes of products.
Most extrusions are custom profiles which are tooled to meet your blueprint requirements. This is an extremely competitive method of manufacturing due to reasonable tooling costs. There are also standard cord (rod), tubing and channels available.
The tolerance tables in the following pages have been developed by the Rubber Manufacturers Association to assist in your design work.
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 | 1 High Precision |
2 Precision |
3 Commercial |
|
| Drawing Designation | E1 | E2 | E3 | |
| Dimensions (mm) | ||||
| Above | Up To | |||
| 0 | 1.5 | +/- 0.15 | +/- 0.25 | +/- 0.40 |
| 1.5 | 2.5 | 0.20 | 0.35 | 0.50 |
| 2.5 | 4.0 | 0.25 | 0.40 | 0.70 |
| 4.0 | 6.3 | 0.35 | 0.50 | 0.80 |
| 6.3 | 10 | 0.40 | 0.70 | 1.00 |
| 10 | 16 | 0.50 | 0.80 | 1.30 |
| 16 | 25 | 0.70 | 1.00 | 1.60 |
| 25 | 40 | 0.80 | 1.30 | 2.00 |
| 40 | 63 | 1.00 | 1.60 | 2.50 |
| 63 | 100 | 1.30 | 2.00 | 3.20 |
| RMA Class | 1 High Precision |
2 Precision |
3 Commercial |
|
| Drawing Designation | E1 | E2 | E3 | |
| Dimensions (in) | ||||
| Above | Up to | |||
| 0 | 0.06 | +/- 0.006 | +/- 0.010 | +/- 0.015 |
| 0.06 | 0.10 | 0.008 | 0.014 | 0.020 |
| 0.10 | 0.16 | 0.010 | 0.016 | 0.027 |
| 0.16 | 0.25 | 0.014 | 0.020 | 0.031 |
| 0.25 | 0.39 | 0.016 | 0.027 | 0.039 |
| 0.39 | 0.63 | 0.020 | 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 |
TABLE 16 - CUT LENGTH TOLERANCE FOR UN-SPLICED EXTRUSION
| RMA Class | 1 Precision |
2 Commercial |
3 Non-Critical |
|
| Drawing Designation | L1 | L2 | L3 | |
| Length (mm) | ||||
| Above | Up to | |||
| 0 | 40 | +/- 0.7 | +/- 1.0 | +/- 1.6 |
| 40 | 63 | 0.8 | 1.3 | 2.0 |
| 63 | 100 | 1.0 | 1.6 | 2.5 |
| 100 | 160 | 1.3 | 2.0 | 3.2 |
| 160 | 250 | 1.6 | 2.5 | 4.0 |
| 250 | 400 | 2.0 | 3.2 | 5.0 |
| 400 | 630 | 2.5 | 4.0 | 6.3 |
| 630 | 1000 | 3.2 | 5.0 | 10.0 |
| 1000 | 1600 | 4.0 | 6.3 | 12.5 |
| 1600 | 2500 | 5.0 | 10.0 | 16.0 |
| 2500 | 4000 | 6.3 | 12.5 | 20.0 |
| 4000 | 0.16% | 0.32% | 0.50% | |
| Drawing Designation | ||||
| Length (in) | ||||
| Above | Up to | |||
| 0 | 1.6 | +/- 0.03 | +/- 0.04 | +/- 0.06 |
| 1.6 | 2.5 | 0.03 | 0.05 | 0.08 |
| 2.5 | 4.0 | 0.04 | 0.06 | 0.10 |
| 4.0 | 6.3 | 0.05 | 0.08 | 0.13 |
| 6.3 | 10.0 | 0.06 | 0.10 | 0.16 |
| 10.0 | 16.0 | 0.08 | 0.13 | 0.20 |
| 16.0 | 25.0 | 0.10 | 0.16 | 0.25 |
| 25.0 | 40.0 | 0.13 | 0.20 | 0.40 |
| 40.0 | 63.0 | 0.16 | 0.25 | 0.50 |
| 63.0 | 100.0 | 0.20 | 0.40 | 0.63 |
| 100.0 | 160.0 | 0.25 | 0.50 | 0.80 |
| 160.0 | 0.16% | 0.32% | 0.50% | |
TABLE 18 - SPLICED LENGTH TOLERANCES
| RMA Class | 1 (Precision) |
2 (Commercial) |
3 (Non-Critical) |
|
| Drawing Designations | S1 | S2 | S3 | |
| Millimeters | ||||
| Above | Up To | |||
| Inches | ||||
| Above | Up To | |||
| 0 | -10 | + 0.13 | + 0.25 | + 0.28 |
| 10 | -16 | 0.16 | 0.28 | 0.32 |
| 16 | -25 | 0.20 | 0.32 | 0.36 |
| 25 | -40 | 0.25 | 0.36 | 0.40 |
| 40 | -63 | 0.32 | 0.40 | 0.45 |
| 63 | -100 | 0.40 | 0.45 | 0.50 |
| 100 | - Over | 0.50 | 0.50 | 0.53 |
TABLE 20 - TOLERANCES ON INTERNAL DIMENSIONS OF MANDREL-SUPPORTED EXTRUSIONS
| RMA Class | 1 (Precision) |
2 (Commercial) |
3 (Non-Critical) |
|
| Drawing Designations | EN1 | EN2 | EN3 | |
| Nominal Dimensions(in Millimeters) | ||||
| Above | Up To | |||
| 0 | 4 | + 0.20 | + 0.20 | + 0.35 |
| 4 | 6.3 | 0.20 | 0.25 | 0.40 |
| 6.3 | 10 | 0.25 | 0.35 | 0.50 |
| 10 | 16 | 0.35 | 0.40 | 0.70 |
| 16 | 25 | 0.40 | 0.50 | 0.80 |
| 25 | 40 | 0.50 | 0.70 | 1.00 |
| 40 | 63 | 0.70 | 0.80 | 1.30 |
| 63 | 100 | 0.80 | 1.00 | 1.60 |
| 100 | 160 | 1.00 | 1.30 | 2.00 |
| 160 | 0.6% | 0.8% | 1.2% | |
| Nominal Dimensions(in Inches) | ||||
| Above | Up To | |||
| 0 | 0.16 | + 0.008 | + 0.008 | + 0.014 |
| 0.16 | 0.25 | 0.008 | 0.010 | 0.016 |
| 0.25 | 0.40 | 0.010 | 1.014 | 0.020 |
| 0.40 | 0.63 | 0.014 | 0.016 | 0.028 |
| 0.63 | 1.00 | 0.016 | 0.020 | 0.032 |
| 1.00 | 1.60 | 0.020 | 0.028 | 0.040 |
| 1.60 | 2.50 | 0.028 | 0.032 | 0.051 |
| 2.50 | 4.00 | 0.032 | 0.040 | 0.063 |
| 4.00 | 6.30 | 0.040 | 0.051 | 0.079 |
| 6.30 | 0.6% | 0.8% | 1.2% |
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