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| standard dimensional tolerance table - molded rubber products | |||||||||||
| DRAWING DESIGNATION "A1" HIGH PRECISION | |||||||||||
| Size | (Millimeters) | Fixed | Closure | Size | (Inches) | Fixed | Closure | ||||
| Above | Incl. | Above | Incl. | ||||||||
| 0 | - | 10 | ±.10 | ±.13 | 0 | - | 0.40 | ±.004 | ±.005 | ||
| 10 | - | 16 | .13 | .16 | .40 | - | .63 | .005 | .006 | ||
| 16 | - | 25 | .16 | .20 | .63 | - | 1.00 | .006 | .008 | ||
| 25 | - | 40 | .20 | .25 | 1.00 | - | 1.60 | .008 | .010 | ||
| 40 | - | 63 | .25 | .32 | 1.60 | - | 2.50 | .010 | .013 | ||
| 63 | - | 100 | .32 | .40 | 2.50 | - | 4.00 | .013 | .016 | ||
| 100 | - | 160 | .40 | .50 | 4.00 | - | 6.30 | .016 | .020 | ||
| DRAWING DESIGNATION "A2" PRECISION | |||||||||||
| Size | (Millimeters) | Fixed | Closure | Size | (Inches) | Fixed | Closure | ||||
| Above | Incl. | Above | Incl. | ||||||||
| 0 | - | 10 | ±.16 | ±.20 | 0 | - | 0.40 | ±.006 | ±.008 | ||
| 10 | - | 16 | .20 | .25 | .40 | - | .63 | .008 | .010 | ||
| 16 | - | 25 | .25 | .32 | .63 | - | 1.00 | .010 | .013 | ||
| 25 | - | 40 | .32 | .40 | 1.00 | - | 1.60 | .013 | .016 | ||
| 40 | - | 63 | .40 | .50 | 1.60 | - | 2.50 | .016 | .020 | ||
| 63 | - | 100 | .50 | .63 | 2.50 | - | 4.00 | .020 | .025 | ||
| 100 | - | 160 | .63 | .80 | 4.00 | - | 6.30 | .025 | .032 | ||
| 160 | - | & over | 6.30 | - | & over | ||||||
| multiply by | .004 | .005 | muliply by | .004 | .005 | ||||||
| DRAWING DESIGNATION "A3" COMMERCIAL | |||||||||||
| Size | (Millimeters) | Fixed | Closure | Size | (Inches) | Fixed | Closure | ||||
| Above | Incl. | Above | Incl. | ||||||||
| 0 | - | 10 | ±.20 | ±.32 | 0 | - | 0.40 | ±.008 | ±.013 | ||
| 10 | - | 16 | .25 | .40 | .40 | - | .63 | .010 | .016 | ||
| 16 | - | 25 | .32 | .50 | .63 | - | 1.00 | .013 | .020 | ||
| 25 | - | 40 | .40 | .63 | 1.00 | - | 1.60 | .016 | .025 | ||
| 40 | - | 63 | .50 | .80 | 1.60 | - | 2.50 | .020 | .032 | ||
| 63 | - | 100 | .63 | 1.00 | 2.50 | - | 4.00 | .025 | .040 | ||
| 100 | - | 160 | .80 | 1.25 | 4.00 | - | 6.30 | .032 | .050 | ||
| 160 | - | & over | 6.30 | - | & over | ||||||
| multiply by | .005 | .008 | muliply by | .005 | .008 | ||||||
| DRAWING DESIGNATION "A4" BASIC | |||||||||||
| Size | (Millimeters) | Fixed | Closure | Size | (Inches) | Fixed | Closure | ||||
| Above | Incl. | Above | Incl. | ||||||||
| 0 | - | 10 | ±.32 | ±.80 | 0 | - | 0.40 | ±.013 | ±.032 | ||
| 10 | - | 16 | .40 | .90 | .40 | - | .63 | .016 | .036 | ||
| 16 | - | 25 | .50 | 1.00 | .63 | - | 1.00 | .020 | .040 | ||
| 25 | - | 40 | .63 | 1.12 | 1.00 | - | 1.60 | .025 | .045 | ||
| 40 | - | 63 | .80 | 1.25 | 1.60 | - | 2.50 | .032 | .050 | ||
| 63 | - | 100 | 1.00 | 1.40 | 2.50 | - | 4.00 | .040 | .056 | ||
| 100 | - | 160 | 1.25 | 1.60 | 4.00 | - | 6.30 | .050 | .063 | ||
| 160 | - | & over | 6.30 | - | & over | ||||||
| multiply by | .008 | .010 | muliply by | .008 | .010 | ||||||
| When applying tolerances the following rules should be kept in mind.
1. Fixed dimension tolerances apply individually to each fixed dimension by its own size. 2. Closure dimension tolerances are determined by the largest closure dimension and the single tolerance is used for all other closure dimensions. 3. Fixed and closure dimensions for a given table do not necessarily go together, and can be split between tables. 4. Tolerances not shown should be determined in consultation with the rubber manufacturer. 5. Care should be taken in applying standard tolerances to products having wide sectional variations. |
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| This table was taken from The Rubber Manufacturers Association's Rubber Handbook for Molded, Extruded, Lathe Cut and Cellular Products www.rma.org |