For outside diameters, Inside Diameters, Wall, width,
Height and general cross-sectional dimensions of extrusions
RMA Class | 1
High Precision |
2
Precision |
3
Precision |
RMA Drawing designation | E1 | E2 | E3 |
Dimension (in Millimeters) | |||
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
Precision |
RMA Drawing designation | E1 | E2 | E3 |
Dimension (in Inches) | |||
Above – Up to | +/- | +/- | +/- |
0 – 06 | 0.006 | 0.010 | 0.015 |
06 – 10 | 0.008 | 0.014 | 0.020 |
10 – 16 | 0.010 | 0.016 | 0.027 |
16 – 25 | 0.014 | 0.020 | 0.031 |
25 – 39 | 0.016 | 0.027 | 0.039 |
39 – 63 | 0.020 | 0.031 | 0.051 |
63 – 98 | 0.027 | 0.039 | 0.063 |
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 |
Note: Tolerances on Dimensions above 100mm (3.94) should be agreed upon by the supplier and user.
General cross-sectional dimensions below 1mm (0.04) are impractical.
In general, softer materials and those requiring a post-cure need greater tolerance.
The following tables are presented as a guide to selecting tolerances. Normally, the lower the drawing designation number, the higher the product and tooling cost. When applying tolerances, the following rules should be kept in mind.
Standard Dimensional Tolerance Table – Molded Solid Rubber Products
Drawing Designation “A-1” High Precision
Size (millimetres) | Fixed | Closure | Size \Inches | Fixed | Closure | |||
Above 0 |
Incl. 10 |
+/-.10 | +/• .13 | Above 0 |
Incl. .40 |
+/•.004 | +/• .005 | |
10 16 25 40 |
16 25 40 63 |
0.13 0.16 0.20 0.25 |
0.16 0.20 0.25 0.32 |
.40 .63 1.00 1.60 |
63 1.00 1.60 2.50 |
0.005 0.006 0.008 0.010 |
0.006 0.008 0.010 0.013 |
|
63 | 100 | 0.32 | 0.40 | 2.50 | 4.00 | 0.013 | 0.016 | |
100 | 160 | 0.40 | 0.50 | 4.00 | 6.30 | 0.016 | 0.020 |
Standard Dimensional Tolerance Table – Molded Solid Rubber Products
Size millimetres | Fixed | Closure | Size \inches | Fixed | Closure | |
Above Incl. 0 – 10 10 – 16 16 – 25 25 – 40 40 – 63 63 – 100 100 – 160 160 – & over multiply by |
+/-.16 0.20 0.25 0.32 0.40 0.50 0.63 0.005 |
+/- .20 0_25 0.32 0.40 0.50 0.63 0.80 0.006 |
Above Incl. 0 – .40 .40 – 63 .63 – 1.00 1.00 – 1.60 1.60 – 2.50 2.50 – 4.00 4.00 – 6.30 6.30 &over multiply by |
+/• .006 0.008 0.010 0.013 0.016 0.020 0.025 0.005 |
+/- .008 0.010 0.013 0.016 0.020 0.025 0.032 0.006 |
Drawing Designation “A-2” Precision
8. Drawing Designation “A2” tolerances indicate a precision Molds must be precision machined and kept in good repair. While measurement methods may be simpler than with Drawing Designation “A1”, careful inspection will usually be required.
Standard Dimensional Tolerance Table – Molded Solid Rubber Products
Drawing Designation “A3” Commercial
Size (millimetres) | Fixed | Closure | Size (inches) | Fixed | Closure | |
Above Incl. 0 – 10 10 – 16 16 – 25 25 – 40 40 – 63 63 – 100 100 – 160 160 – & over multiply by |
+/- .20 0.25 0.32 0.40 0.50 0.63 0.80 0.006 |
+/- .32 0.40 0.50 0.63 0.80 1.00 1.25 0.009 |
Above Incl. 0 – .40 .40 – 63 .63 – 1.00 1.00 – 1.60 1.60 – 2.50 2.50 – 4.00 4.00 – 6.30 6.30 &over multiply by |
+/- .008 0.010 0.013 O.D16 0.020 0.025 0.032 0.006 |
+/- .013 0.016 0.020 0.025 0.032 0.040 0.050 0.009 |
10. Drawing Designation “A3” tolerances indicate a “commercial” product and will normally be used for most Produce
Standard Dimensional Tolerance Table – Molded Solid Rubber Products
Drawing Designation “A4” Non-Critical
Size (millimetres) | Fixed | Closure | Size\Inches) | Fixed | Closure | |
Above Incl. 0 – 10 10 – 16 16 – 25 25 – 40 40 – 63 63 – 100 100 – 160 160 – & over multiply by |
+/- .32 0.40 0.50 0.63 0.80 1.00 1.25 0.008 |
+/- .80 0.90 1.00 1.12 1.25 1.40 1.60 0.010 |
Above Incl. 0 – .40 .40 – 63 .63 – 1.00 1.00 – 1.60 1.60 – 2.50 2.50 – 4.00 4.00 – 6.30 6.30 &over multiply by |
+/- .013 0.016 0.020 0.025 0.032 0.040 0.050 0.008 |
+/- .032 0.036 0.040 0.045 0.050 0.056 0.063 0.010 |
Drawing Designation “A4” tolerances apply to products where dimensional control is non-critical and secondary to cost.