Core Plug Conversion Chart

Core Plug Conversion Chart

Please note – Core plug are 0.25mm – 0.40mm (0.010″ – 0.015″) oversize which is the interference fit required when installing.

Inches Metric
Fractional Decimal mm
. 0.0039 0.1000
. 0.0079 0.2000
. 0.0118 0.3000
1/64 0.0156 0.3969
. 0.0157 0.4000
. 0.0197 0.5000
. 0.0236 0.6000
. 0.0276 0.7000
1/32 0.0313 0.7938
. 0.0315 0.8000
. 0.0354 0.9000
. 0.0394 1.0000
. 0.0433 1.1000
3/64 0.0469 1.1906
. 0.0472 1.2000
. 0.0512 1.3000
. 0.0551 1.4000
. 0.0591 1.5000
1/16 0.0625 1.5875
. 0.0630 1.6000
. 0.0669 1.7000
. 0.0709 1.8000
. 0.0748 1.9000
5/64 0.0781 1.9844
. 0.0787 2.0000
. 0.0827 2.1000
. 0.0866 2.2000
. 0.0906 2.3000
3/32 0.0938 2.3813
. 0.0945 2.4000
. 0.0984 2.5000
7/64 0.1094 2.7781
. 0.1181 3.0000
1/8 0.1250 3.1750
. 0.1378 3.5000
9/64 0.1406 3.5719
5/32 0.1563 3.9688
. 0.1575 4.0000
11/64 0.1719 4.3656
. 0.1772 4.5000
3/16 0.1875 4.7625
. 0.1969 5.0000
13/64 0.2031 5.1594
. 0.2165 5.5000
7/32 0.2188 5.5563
15/64 0.2344 5.9531
. 0.2362 6.0000
1/4 0.2500 6.3500
. 0.2559 6.5000
17/64 0.2656 6.7469
. 0.2756 7.0000
9/32 0.2813 7.1438
. 0.2953 7.5000
19/64 0.2969 7.5406
5/16 0.3125 7.9375
. 0.3150 8.0000
21/64 0.3281 8.3344
. 0.3346 8.5000
11/32 0.3438 8.7313
. 0.3543 9.0000
23/64 0.3594 9.1281
. 0.3740 9.5000
3/8 0.3750 9.5250
25/64 0.3906 9.9219
. 0.3937 10.0000
13/32 0.4063 10.3188
. 0.4134 10.5000
27/64 0.4219 10.7156
. 0.4331 11.0000
7/16 0.4375 11.1125
. 0.4528 11.5000
29/64 0.4531 11.5094
15/32 0.4688 11.9063
. 0.4724 12.0000
31/64 0.4844 12.3031
. 0.4921 12.5000
1/2 0.5000 12.7000
. 0.5118 13.0000
33/64 0.5156 13.0969
17/32 0.5313 13.4938
. 0.5315 13.5000
35/64 0.5469 13.8906
. 0.5512 14.0000
9/16 0.5625 14.2875
. 0.5709 14.5000
37/64 0.5781 14.6844
. 0.5906 15.0000
19/32 0.5938 15.0813
39/64 0.6094 15.4781
. 0.6102 15.5000
5/8 0.6250 15.8750
. 0.6299 16.0000
41/64 0.6406 16.2719
. 0.6496 16.5000
21/32 0.6563 16.6688
. 0.6693 17.0000
43/64 0.6719 17.0656
11/16 0.6875 17.4625
. 0.6890 17.5000
45/64 0.7031 17.8594
. 0.7087 18.0000
23/32 0.7188 18.2563
. 0.7283 18.5000
47/64 0.7344 18.6531
. 0.7480 19.0000
3/4 0.7500 19.0500
49/64 0.7656 19.4469
. 0.7677 19.5000
25/32 0.7813 19.8438
. 0.7874 20.0000
51/64 0.7969 20.2406
. 0.8071 20.5000
13/16 0.8125 20.6375
. 0.8268 21.0000
53/64 0.8281 21.0344
27/32 0.8438 21.4313
. 0.8465 21.5000
55/64 0.8594 21.8281
. 0.8661 22.0000
7/8 0.8750 22.2250
. 0.8858 22.5000
57/64 0.89063 22.6219
. 0.9055 23.0000
29/32 0.90625 23.0188
59/64 0.92188 23.4156
. 0.9252 23.5000
15/16 0.93750 23.8125
. 0.9449 24.0000
61/64 0.95313 24.2094
. 0.9646 24.5000
31/32 0.96875 24.6063
. 0.9843 25.0000
63/64 0.98438 25.0031
1 1.000 25.40
. 1.0039 25.5000
. 1.0236 26.0000
. 1.0433 26.5000
. 1.0630 27.0000
. 1.0827 27.5000
. 1.1024 28.0000
. 1.1220 28.5000
. 1.1417 29.0000
. 1.1614 29.5000
. 1.1811 30.0000
. 1.2205 31.0000
1 1/4 1.2500 31.7500
. 1.2598 32.0000
. 1.2992 33.0000
. 1.3386 34.0000
. 1.3780 35.0000
. 1.4173 36.0000
. 1.4567 37.0000
. 1.4961 38.0000
1 1/2 1.5000 38.1000
. 1.5354 39.0000
. 1.5748 40.0000
. 1.6142 41.0000
. 1.6535 42.0000
. 1.6929 43.0000
. 1.7323 44.0000
1 3/4 1.7500 44.4500
. 1.7717 45.0000
. 1.8110 46.0000
. 1.8504 47.0000
. 1.8898 48.0000
. 1.9291 49.0000
. 1.9685 50.0000
2 2.0000 50.8000
. 2.0079 51.0000
. 2.0472 52.0000
. 2.0866 53.0000
. 2.1260 54.0000
. 2.1654 55.0000
. 2.2047 56.0000
. 2.2441 57.0000
2 1/4 2.2500 57.1500
. 2.2835 58.0000
. 2.3228 59.0000
. 2.3622 60.0000
. 2.4016 61.0000
. 2.4409 62.0000
. 2.4803 63.0000
2 1/2 2.5000 63.5000
. 2.5197 64.0000
. 2.5591 65.0000
. 2.5984 66.0000
. 2.6378 67.0000
. 2.6772 68.0000
. 2.7165 69.0000
2 3/4 2.7500 69.8500

 

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