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Drill	Deci-mal	Metric	STD  Tap	Metric Tap	NPT  Tap		Drill	Deci-mal	Metric	STD  Tap	Metric Tap	NPT  Tap
8.0mm	0.3149	7.999					11.1mm	0.4370	11.100
O	0.3160	8.026					7/16	0.4375	11.113			1/4-18
8.1mm	0.3188	8.098					11.2mm	0.4409	11.199
8.2mm	0.3228	8.199					11.3mm	0.4448	11.298
P	0.3230	8.204					11.4mm	0.4488	11.400
8.3mm	0.3267	8.298					11.5mm	0.4527	11.499
21/64	0.3281	8.334					29/64	0.4531	11.509	1/2-20
8.4mm	0.3307	8.400					11.6mm	0.4566	11.598
Q	0.3320	8.433	3/8-24				11.7mm	0.4606	11.699
8.5mm	0.3346	8.499		M10 X 1.5			11.8mm	0.4645	11.798
8.6mm	0.3385	8.598					11.9mm	0.4685	11.900
R	0.3390	8.611			1/8-27		15/32	0.4687	11.905
8.7mm	0.3425	8.700					12.0mm	0.4724	11.999		M14 X 2.0
11/32	0.3437	8.730					12.1mm	0.4763	12.098
8.8mm	0.3464	8.799					12.2mm	0.4803	12.200
S	0.3480	8.839					12.3mm	0.4842	12.299
8.9mm	0.3503	8.898					31/64	0.4843	12.301	9/16-1
9.0mm	0.3543	8.999					12.4mm	0.4881	12.398
T	0.3580	9.093					12.5mm	0.4921	12.499
9.1mm	0.3582	9.098					12.6mm	0.4960	12.598
23/64	0.3593	9.126					1/2	0.5000	12.700
9.2mm	0.3622	9.200					12.7mm	0.5000	12.700
9.3mm	0.3661	9.299					12.8mm	0.5039	12.799
U	0.3680	9.347	7/16-1				12.9mm	0.5078	12.898
9.4mm	0.3700	9.398					13.0mm	0.5118	13.000
9.5mm	0.3740	9.500					33/64	0.5156	13.096	9/16-1
3/8	0.3750	9.525					13.1mm	0.5157	13.099
V	0.3770	9.576					13.2mm	0.5196	13.198
9.6mm	0.3779	9.599					13.3mm	0.5236	13.299
9.7mm	0.3818	9.698					13.4mm	0.5275	13.399
9.8mm	0.3858	9.799					17/32	0.5312	13.493	5/8-11
W	0.3860	9.804	7/16-2				13.5mm	0.5314	13.498
9.9mm	0.3897	9.898					13.6mm	0.5354	13.599
25/64	0.3906	9.921					13.7mm	0.5393	13.698
10.0mm	0.3937	10.000					13.8mm	0.5433	13.800
X	0.3970	10.084					35/64	0.5468	13.889
10.1mm	0.3976	10.099					13.9mm	0.5472	13.899
10.2mm	0.4015	10.198					14.0mm	0.5511	13.998		M16 X 2.0
Y	0.4040	10.262		M12 X 1.75			14.1mm	0.5551	14.100
10.3mm	0.4055	10.300					14.2mm	0.5590	14.199
13/32	0.4062	10.318					9/16	0.5625	14.288
10.4mm	0.4094	10.399					14.3mm	0.5629	14.298
Z	0.4130	10.490					14.4mm	0.5669	14.399
10.5mm	0.4133	10.498					14.5mm	0.5708	14.498
10.6mm	0.4173	10.599					14.6mm	0.5748	14.600
10.7mm	0.4212	10.699					37/64	0.5781	14.684			3/8-18
27/64	0.4218	10.714	1/2-13				37/64	0.5781	14.684	5/8-18
27/64	0.4218	10.714	1/2-12				14.7mm	0.5787	14.699
10.8mm	0.4251	10.798					14.8mm	0.5826	14.798
10.9mm	0.4291	10.899					14.9mm	0.5866	14.900
11.0mm	0.4330	10.998					15.0mm	0.5905	14.999
11.1mm	0.4370	11.100
7/16	0.4375	11.113			1/4-18
11.2mm	0.4409	11.199
11.3mm	0.4448	11.298
11.4mm	0.4488	11.400
11.5mm	0.4527	11.499
29/64	0.4531	11.509	1/2-20
11.6mm	0.4566	11.598
11.7mm	0.4606	11.699
11.8mm	0.4645	11.798
11.9mm	0.4685	11.900
15/32	0.4687	11.905
12.0mm	0.4724	11.999		M14 X 2.0
12.1mm	0.4763	12.098
12.2mm	0.4803	12.200
12.3mm	0.4842	12.299
31/64	0.4843	12.301	9/16-1
12.4mm	0.4881	12.398
12.5mm	0.4921	12.499
12.6mm	0.4960	12.598
1/2	0.5000	12.700
12.7mm	0.5000	12.700
12.8mm	0.5039	12.799
12.9mm	0.5078	12.898
13.0mm	0.5118	13.000
33/64	0.5156	13.096	9/16-1
13.1mm	0.5157	13.099
13.2mm	0.5196	13.198
13.4mm	0.5275	13.399
17/32	0.5312	13.493	5/8-11
13.5mm	0.5314	13.498
13.6mm	0.5354	13.599
13.7mm	0.5393	13.698
13.8mm	0.5433	13.800
35/64	0.5468	13.889
13.9mm	0.5472	13.899
14.0mm	0.5511	13.998		M16 X 2.0
14.1mm	0.5551	14.100
14.2mm	0.5590	14.199
9/16	0.5625	14.288
14.3mm	0.5629	14.298
14.4mm	0.5669	14.399
14.5mm	0.5708	14.498
14.6mm	0.5748	14.600
37/64	0.5781	14.684			3/8-18
37/64	0.5781	14.684	5/8-18
14.7mm	0.5787	14.699
14.8mm	0.5826	14.798
14.9mm	0.5866	14.900
15.0mm	0.5905	14.999
19/32	0.5937	15.080
15.1mm	0.5944	15.098
15.2mm	0.5984	15.199
15.3mm	0.6023	15.298
15.4mm	0.6062	15.398
39/64	0.6093	15.476
15.5mm	0.6102	15.499		M18 X 2.5
15.6mm	0.6141	15.598
15.7mm	0.6181	15.700
15.8mm	0.6220	15.799
5/8	0.6250	15.875
15.9mm	0.6259	15.898
16.0mm	0.6299	16.000
16.1mm	0.6338	16.099
16.2mm	0.6377	16.198
41/64	0.6406	16.271
16.3mm	0.6417	16.299
16.4mm	0.6456	16.398
16.5mm	0.6496	16.500
16.6mm	0.6535	16.599
21/32	0.6562	16.668	3/4-10
16.7mm	0.6574	16.698
16.8mm	0.6614	16.800
16.9mm	0.6653	16.899
17.0mm	0.6692	16.998
43/64	0.6718	17.064
17.1mm	0.6732	17.099
17.2mm	0.6771	17.198
17.3mm	0.6811	17.300
17.4mm	0.6850	17.399
11/16	0.6875	17.463	3/4-16
17.5mm	0.6889	17.498		M20 X 2.5
17.6mm	0.6929	17.600
17.7mm	0.6968	17.699
17.8mm	0.7007	17.798
45/64	0.7031	17.859			1/2-14
17.9mm	0.7047	17.899
18.0mm	0.7086	17.998
18.1mm	0.7125	18.098
18.2mm	0.7165	18.199
23/32	0.7187	18.255
18.3mm	0.7204	18.298
18.4mm	0.7244	18.400
18.5mm	0.7283	18.499
18.6mm	0.7322	18.598
47/64	0.7343	18.651
18.7mm	0.7362	18.700
18.8mm	0.7401	18.799
18.9mm	0.7440	18.898
19.0mm	0.7480	18.999
3/4	0.7500	19.050
19.1mm	0.7519	19.098
19.2mm	0.7559	19.200
19.3mm	0.7598	19.299
19.4mm	0.7637	19.398
49/64	0.7656	19.446	7/8-9
19.5mm	0.7677	19.500
19.6mm	0.7716	19.599
19.7mm	0.7755	19.698
19.8mm	0.7795	19.799
25/32	0.7812	19.843
19.9mm	0.7834	19.898
20.0mm	0.7874	20.000
20.1mm	0.7913	20.099
20.2mm	0.7952	20.198
51/64	0.7968	20.239
20.3mm	0.7992	20.300
20.4mm	0.8031	20.399
20.5mm	0.8070	20.498
20.6mm	0.8110	20.599
13/16	0.8125	20.638	7/8-14
20.7mm	0.8149	20.699
20.8mm	0.8188	20.798
20.9mm	0.8228	20.899
21.0mm	0.8267	20.998
53/64	0.8281	21.034
21.1mm	0.8307	21.100
21.2mm	0.8346	21.199
21.3mm	0.8385	21.298
21.4mm	0.8425	21.400
27/32	0.8437	21.430
21.5mm	0.8464	21.499
21.6mm	0.8503	21.598
21.7mm	0.8543	21.699
21.8mm	0.8582	21.798
55/64	0.8593	21.826
21.9mm	0.8622	21.900
22.0mm	0.8661	21.999
22.1mm	0.8700	22.098
22.2mm	0.8740	22.200
7/8	0.8750	22.225	1-8
22.3mm	0.8779	22.299
22.4mm	0.8818	22.398
22.5mm	0.8858	22.499
22.6mm	0.8897	22.598
57/64	0.8906	22.621
22.7mm	0.8937	22.700
22.8mm	0.8976	22.799
22.9mm	0.9015	22.898
23.0mm	0.9055	23.000
29/32	0.9062	23.018
23.1mm	0.9094	23.099
23.2mm	0.9133	23.198
23.3mm	0.9173	23.299
23.4mm	0.9212	23.399
59/64	0.9218	23.414			3/4-14
59/64	0.9218	23.414	1-12
23.5mm	0.9251	23.498
23.6mm	0.9291	23.599
23.7mm	0.9330	23.698
23.8mm	0.9370	23.800
15/16	0.9375	23.813	1-14
23.9mm	0.9409	23.899
24.0mm	0.9448	23.998
24.1mm	0.9488	24.100
24.2mm	0.9527	24.199
61/64	0.9531	24.209
24.3mm	0.9566	24.298
24.4mm	0.9606	24.399
24.5mm	0.9645	24.498
24.6mm	0.9685	24.600
31/32	0.9687	24.605
24.7mm	0.9724	24.699
24.8mm	0.9763	24.798
24.9mm	0.9803	24.900
25.0mm	0.9842	24.999
63/64	0.9843	25.001
25.1mm	0.9881	25.098
25.2mm	0.9921	25.199
25.3mm	0.9960	25.298
25.4mm	1.0000	25.400
	1.1250	28.575
	1.1810	29.997
	1.2500	31.750
	1.2598	31.999
	1.3779	34.999
	1.5000	38.100
	1.5748	40.000
	1.9685	50.000
	2.0000	50.800
	2.7559	70.000
	3.1250	79.375
	3.1496	80.000
	3.3750	85.725
	3.9370	######
	4.0000	######
	4.3750	######
	4.5000	######
	4.7244	######
	4.9212	######
	5.0000	######
	5.2500	######
	5.9055	######
	6.0000	######
	6.2500	######
	6.2992	######
	6.5000	######
	7.0000	######
	7.0866	######
	7.2500	######
	7.8740	######
	8.0000	######
	8.2500	######
	8.5000	######
	8.6614	######
	9.0000	######
	9.8425	######
	10.0000	######
	11.0000	######
	11.2500
	11.8110	######
	12.0000	######
	12.0078	######
	12.4015	######
	12.9921	######
	13.7795	######
	14.0000	######
	14.9606	######
	15.0000	######
	16.0000	######
	16.5354	######
	18.0000	######
	18.1102	######
	20.0000	######
	22.0000	######
	22.5000
	24.0000	######
	30.0000
	45.0000
	60.0000
	90.0000