RMA Standard Cross-sectional Tolerance Tables

For outside diameters, inside diameters, wall, width, Height, and general cross-sectional dimensions of extrusions.

Metric Tolerances

RMA Class 1 2 3
Drawing Designation
Dimensions in Millimeters 

0.0 to 1.5
1.5 to 2.5
2.5 to 4.0
4.0 to 6.3
6.3 to 10.0
10.0 to 16.0
16.0 to 25.0
25.0 to 40.0
40.0 to 63.0
63.0 to 100.0

 High Precision
“E1”
Tolerance
+/-0.15
+/-0.20
+/-0.25
+/-0.35
+/-0.40
+/-0.50
+/-0.70
+/-0.80
+/-1.00
+/-1.30		 Precision
“E2”
Tolerance
+/-0.25
+/-0.35
+/-0.40
+/-0.50
+/-0.70
+/-0.80
+/-1.00
+/-1.30
+/-1.60
+/-2.00		 Commercial
“E3”
Tolerance
+/-0.40
+/-0.50
+/-0.70
+/-0.80
+/-1.00
+/-1.30
+/-1.60
+/-2.00
+/-2.50
+/-3.20

 

English Tolerances

RMA Class 1 2 3
Drawing Designation
Dimensions in Inches 

0.0 to 0.06
0.06 to 0.10
0.10 to 0.16
0.16 to 0.25
0.25 TO 0.39
0.39 to 0.63
0.63 TO 0.98
0.98 to 1.57
1.57 TO 2.48
2.48 to 3.94

 High Precision
“E1”
Tolerance
+/-0.006
+/-0.008
+/-0.010
+/-0.014
+/-0.016
+/-0.020
+/-0.027
+/-0.031
+/-0.39
+/-0.051		 Precision
“E2”
Tolerance
+/-0.010
+/-0.014
+/-0.016
+/-0.020
+/-0.027
+/-0.031
+/-0.039
+/-0.051
+/-0.063
+/-0.079		 Commercial
“E3”
Tolerance
+/-0.015
+/-0.020
+/-0.027
+/-0.031
+/-0.039
+/-0.051
+/-0.063
+/-0.079
+/-0.098
+/-0.126