RMA A3 Dimensional Tolerances for Molded Solid Rubber Products 1/
TOLERANCES FOR MOLDED SOLID RUBBER PRODUCTS COMMON
SIZE
(millimeters)
Fixed dimension
tolerance 2/
(millimeters)
Closure dimension
tolerance 3/
(millimeters)
Size - Inches
(approximate)
Fixed dimension
tolerance 2/
(inches)
Closure dimension
tolerance 3/
(inches)
AboveInclusiveAboveInclusive
09.99± 0.20± 0.3200.399± 0.008± 0.013
1015.99± 0.25± 0.400.40.629± 0.010± 0.016
1624.99± 0.32± 0.500.630.999± 0.013± 0.020
2539.99± 0.40± 0.6311.599± 0.016± 0.025
4062.99± 0.50± 0.801.62.499± 0.020± 0.032
6399.99± 0.63± 1.002.53.999± 0.025± 0.040
100159.99± 0.80± 1.2546.299± 0.032± 0.050
160 & overTo find fixed
dimensional
tolerances,
multiply size
by 0.5 percent
6.30 & overTo find fixed
dimensional
tolerances,
multiply size
by 0.5 percent

1/ This table should be used only with common shaped, all rubber parts.
2/ Fixed dimension tolerances apply individually to each fixed dimension by its own size.
3/ Closure dimension tolerances are determined by the largest closure dimension, and this single tolerance shall be used for all
other closure dimensions. (Closure dimension refers to any dimension in a plane parallel to the plane traced when the mold
closes.)

TOLERANCES FOR RUBBER SHEET PACKING
THICKNESSTOLERANCES
MillimetersInches (approximate)MillimetersInches
Under 0.80Under 0.031± 0.25± 0.010
0.80 to 1.590.031 to 0.059± 0.30± 0.012
1.60 to 3.190.060 to 0.124± 0.40± 0.016
3.20 to 4.790.125 to 0.186± 0.50± 0.020
4.80 to 9.490.187 to 0.374± 0.80± 0.031
9.50 to 14.290.375 to 0.561± 1.20± 0.047
14.30 to 19.190.562 to 0.749± 1.60± 0.063
19.20 to 25.390.750 to 0.999± 2.40± 0.093
25.40 and over1.00 and over± 10%± 10%