Router Bits

Inch / Metric Conversion Chart

Inch » Metric Conversion Chart

Most of the router bits in our catalog are manufacture to imperial specifications as this is the current standard for South Africa for the past 40 years. Since most woodworkers work with metric measurements, we made the conversion chart available for you to use at your convenience.

Kindly keep in mind that you should consider the maximum speed rating for the router bit you plan to use.

We took liberty to mark all the sizes mostly used  in bold.

Here are the general sizes for our bits:

INCHESMETRIC
FRACTIONALDECIMALmm
3/320.09382.3813
.0.09452.4000
.0.09842.5000
7/640.10942.7781
.0.11813.0000
1/80.12503.1750
.0.13783.5000
9/640.14063.5719
5/320.15633.9688
.0.15754.0000
11/640.17194.3656
.0.17724.5000
3/160.18754.7625
.0.19695.0000
13/640.20315.1594
.0.21655.5000
7/320.21885.5563
15/640.23445.9531
.0.23626.0000
1/40.25006.3500
.0.25596.5000
17/640.26566.7469
.0.27567.0000
9/320.28137.1438
.0.29537.5000
19/640.29697.5406
5/160.31257.9375
.0.31508.0000
21/640.32818.3344
.0.33468.5000
11/320.34388.7313
.0.35439.0000
23/640.35949.1281
.0.37409.5000
3/80.37509.5250
25/640.39069.9219
.0.393710.0000
13/320.406310.3188
.0.413410.5000
27/640.421910.7156
.0.433111.0000
7/160.437511.1125
.0.452811.5000
29/640.453111.5094
15/320.468811.9063
.0.472412.0000
31/640.484412.3031
.0.492112.5000
1/20.500012.7000
.0.511813.0000
33/640.515613.0969
17/320.531313.4938
.0.531513.5000
35/640.546913.8906

 

INCHESMETRIC
FRACTIONALDECIMALmm
.0.551214.0000
9/160.562514.2875
.0.570914.5000
37/640.578114.6844
.0.590615.0000
19/320.593815.0813
39/640.609415.4781
.0.610215.5000
5/80.625015.8750
.0.629916.0000
41/640.640616.2719
.0.649616.5000
21/320.656316.6688
.0.669317.0000
43/640.671917.0656
11/160.687517.4625
.0.689017.5000
45/640.703117.8594
.0.708718.0000
23/320.718818.2563
.0.728318.5000
47/640.734418.6531
.0.748019.0000
3/40.750019.0500
49/640.765619.4469
.0.767719.5000
25/320.781319.8438
.0.787420.0000
51/640.796920.2406
.0.807120.5000
13/160.812520.6375
.0.826821.0000
53/640.828121.0344
27/320.843821.4313
.0.846521.5000
55/640.859421.8281
.0.866122.0000
7/80.875022.2250
.0.885822.5000
57/640.890622.6219
.0.905523.0000
29/320.906323.0188
59/640.921923.4156
.0.925223.5000
15/160.937523.8125
.0.944924.0000
61/640.953124.2094
.0.964624.5000
31/320.968824.6063
.0.984325.0000
63/640.984425.0031
11.000025.4000
.1.003925.5000
.1.023626.0000
.1.043326.5000
.1.063027.0000
.1.082727.5000
.1.102428.0000
.1.122028.5000
1 1/8 28.60
.1.141729.0000
.1.161429.5000
.1.181130.0000
1 3/16 30.20
.1.220531.0000
1 1/41.250031.7500
.1.259832.0000
.1.299233.0000
.1.338634.0000
1 3/8 34.90
.1.378035.0000
.1.417336.0000
.1.456737.0000
.1.496138.0000
1 1/21.500038.1000
.1.535439.0000
1 37/64 1.574840.0000
.1.614241.0000
1 5/8 41.30
.1.653542.0000
.1.692943.0000
.1.732344.0000
1 3/41.750044.4500
.1.771745.0000
.1.811046.0000
1 7/81.850447.60

 

INCHESMETRIC
FRACTIONALDECIMALmm
.1.889848.0000
.1.929149.0000
.1.968550.0000
22.000050.8000
.2.007951.0000
.2.047252.0000
.2.086653.0000
2 1/82.126054.0000
2 1/42.250057.1500
2 1/22.500063.5000
2 3/42.750069.8500
33.000076.2000
3 1/23.588.9