TOLERANCE OF WALL THICKNESS   TOLERANCE OF MEAN OUTSIDE DIAMETER
Specified
wall
thickness
Tolerances on specified
thickness
(plus & minus)
Maximum
wall
thickness
at any point
Minimum
wall
thicknes
at any point
(1) mm
(2) mm
(3) mm
(4) mm
0.5
0.05
0.58
0.43
0.6
0.07
0.71
0.51
0.8
0.07
0.91
0.71
1.0
0.10
1.16
0.86
1.2
0.10
1.37
1.06
1.5
0.12
1.70
1.35
2.0
0.15
2.23
1.82
2.5
0.16
2.70
2.20
3
0.20
3.25
2.64
4
0.25
4.47
3.66
5 0.31
5.50
4.60
6 0.36
6.50
5.50
8 0.39
8.50
7.50
10 0.50
11.00
9.30
12 0.60
13.00
11.00
16 0.80
17.00
15.00
20 1.00
21.00
19.00
 
  Tolerance  
Outside Diameter
Specification
Normal
Reduced
mm
mm
mm
  +
+
-
-
-
upto 10
0.08
0.045
Over 10 to18
0.10
0.045
Over 18 to32
0.12
0.055
Over 32 to 50
0.15
0.070
Over 50 to 80
0.20
-
Over 80 to 125
0.25
-
Over 125 to 200
0.50
-
Over 200 to 250
0.80
-
Over 250 to 315
1.00
-
 
DECIMAL EQUIVALENT OF FRACTIONS IN INCHES AND MILLIMETRES
Fraction Inches
Millimetress
Fraction
Inches
Millimetress

1/64
1/32
3/64
1/16
5/64
3/32
7/64
1/8
9/64
5/32
11/64
3/16
13/64
7/32
15/64
1/4
17/64
9/32
19/64
5/16
21/64
11/32
23/64
3/8
25/64
13/32
27/64
7/16
29/64
15/32
31/64
1/2

0.015.625
0.031.250
0.046.875
0.062.500
0.078.125
0.093.750
0.109.375
0.125.000
0.140.625
0.156.250
0.171.875
0.187.500
0.203.125
0.218.750
0.234.375
0.250.000
0.265.625
0.281.250
0.296.875
0.312.500
0.328.125
0.343.750
0.359.375
0.375.000
0.390.625
0.406.250
0.421.875
0.437.500
0.453.125
0.468.750
0.484.375
0.500.000
0.397
0.794
1.190
1.587
1.984
2.381
2.778
3.175
3.572
3.969
4.366
4.762
5.159
5.556
5.953
6.350
6.747
7.144
7.541
7.937
8.334
8.731
9.128
9.525
9.922
10.319
11.716
11.112
11.509
11.906
12.303
12.700
33/64
17/32
35/64
9/16
37/64
19/32
39/64
5/8
41/64
21/32
43/64
11/16
45/64
23/32
47/64
3/4
49/64
25/32
51/64
13/16
53/64
27/32
55/64
7/8
57/64
29/32
15/16
61/64
31/32
63/34
1
0.515.625
0.531.250
0.546.875
0.562.500
0.578.125
0.593.750
0.609.375
0.625.000
0.640.625
0.656.250
0.671.875
0.687.500
0.703.125
0.718.750
0.734.375
0.750.000
0.765.625
0.781.250
0.796.875
0.812.500
0.828.125
0.843.750
0.859.375
0.875.000
0.890.625
0.906.250
0.937.500
0.953.125
0.968.750
0.984.375
1.000.000
13.097
13.494
13.890
14.287
14.684
15.081
15.478
15.875
16.272
16.669
17.065
17.462
17.859
18.256
18.653
19.050
19.447
19.844
20.240
20.637
21.034
21.431
21.828
22.225
22.622
23.019
23.812
24.209
24.606
25.003
25.400
 
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