BBR Drill/Tap Decimal Equivalence Table

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Inch Sizes Machine Screw Sizes Metric Sizes Wire Gage Sizes Letter Sizes

					Equivalent		Drill Size for Cut threads
Inch Fractional	Machine Screws	Metric	Wire Gage	Letter	Decimal	Metric	Thread Pitch	Use Drill	Decimal Equiv.
			104		0.0031	0.079
			103		0.0035	0.089
			102		0.0039	0.099
			101		0.0043	0.109
			100		0.0047	0.119
			99		0.0051	0.130
			98		0.0055	0.140
			97		0.0059	0.150
			96		0.0063	0.160
			95		0.0067	0.170
			94		0.0071	0.180
			93		0.0075	0.191
			92		0.0079	0.201
			91		0.0083	0.211
			90		0.0087	0.221
			89		0.0091	0.231
			88		0.0095	0.241
		0.25mm			0.0098	0.250
			87		0.0100	0.254
			86		0.0105	0.267
			85		0.0110	0.279
			84		0.0115	0.292
		0.30mm			0.0118	0.300
			83		0.0120	0.305
			82		0.0125	0.318
		0.32mm			0.0126	0.320
			81		0.0130	0.330
			80		0.0135	0.343
		0.35mm			0.0138	0.350
			79		0.0145	0.368
		0.38mm			0.0150	0.380
1/64"					0.0156	0.396
		0.40mm			0.0157	0.400
			78		0.0160	0.406
		0.42mm			0.0165	0.420
		0.45mm			0.0177	0.450
			77		0.0180	0.457
		0.48mm			0.0189	0.480
		0.50mm			0.0197	0.500
			76		0.0200	0.508
			75		0.0210	0.533
		0.55mm			0.0217	0.550
			74		0.0225	0.572
		0.60mm			0.0237	0.600
			73		0.0240	0.610
			72		0.0250	0.635
		0.65mm			0.0256	0.650
			71		0.0260	0.660
		0.70mm			0.0276	0.700
			70		0.0280	0.711
			69		0.0292	0.742
		0.75mm			0.0295	0.750
			68		0.0310	0.787
1/32"					0.0313	0.794
		0.80mm			0.0315	0.800
			67		0.0320	0.813
			66		0.0330	0.838
		0.85mm			0.0335	0.850
			65		0.0350	0.889
		0.90mm			0.0354	0.900
			64		0.0360	0.914
			63		0.0370	0.940
			62		0.0380	0.965
			61		0.0390	0.991
		1mm			0.0394	1.000
			60		0.0400	1.016
			59		0.0410	1.041
			58		0.0420	1.067
			57		0.0430	1.092
			56		0.0465	1.181
			55		0.0520	1.321
			54		0.0550	1.397
		1.5mm			0.0591	1.500
			53		0.0595	1.511
	#0				0.0600	1.524	0-80	3/64"	.0469"
1/16"					0.0625	1.588
		1.6mm			0.0630	1.600	M1.6 x 0.35	1.25mm	.0492"
			52		0.0635	1.613
			51		0.0670	1.702
			50		0.0700	1.778
		1.8mm			0.0709	1.800	M1.8 x 0.35	1.45mm	.0571"
	#1				0.0730	1.524	1-64 1-72	#53 #53	.0595" .0595"
			49		0.0730	1.854
			48		0.0760	1.930
			47		0.0785	1.994
		2mm			0.0787	2.000	M2 x 0.40	1.60mm	.0630"
			46		0.0810	2.057
			45		0.0820	2.083
			44		0.0860	2.184
	#2				0.0860	2.184	2-56 2-64	#50 #50	.0700" .0700"
		2.2mm			0.0866	2.200	M2.2 x 0.45	1.75mm	0.689"
			43		0.0890	2.261
			42		0.0935	2.375
			41		0.0960	2.438
			40		0.0980	2.489
		2.5mm			0.0984	2.500	M2.5 x 0.45	2.05mm	.0807"
	#3				0.0990	2.515	3-48 3-56	#47 #45	.0785" .0810"
			39		0.0995	2.527
			38		0.1015	2.578
			37		0.1040	2.642
			36		0.1065	2.705
			35		0.1100	2.794
			34		0.1110	2.819
	#4				0.1120	2.845	4-40 4-48	#43 #42	.0890" .0935"
			33		0.1130	2.870
			32		0.1160	2.946
		3mm			0.1181	3.000	M3 x 0.50	2.50mm	.0984"
			31		0.1200	3.048
1/8"					0.1250	3.175
			30		0.1285	3.264
			29		0.1360	3.454
		3.5mm			0.1378	3.500	M3.5 x 0.60	2.90mm	.1142"
	#6				0.1380	3.505	6-32 6-40	#36 #33	.1065" .1130"
			28		0.1405	3.569
			27		0.1440	3.658
			26		0.1470	3.734
			25		0.1495	3.797
			24		0.1520	3.861
			23		0.1540	3.912
			22		0.1570	3.988
		4mm			0.1575	4.000	M4 x 0.70	3.30mm	.1299"
			21		0.1590	4.039
			20		0.1610	4.089
	#8				0.1640	4.166	8-32 8-36	#29 #29	.1360"
			19		0.1660	4.216
			18		0.1695	4.305
			17		0.1730	4.394
			16		0.1770	4.496
		4.5mm			0.1772	4.500	M4.5 x 0.75	3.70mm	.1457"
			15		0.1800	4.572
			14		0.1820	4.623
			13		0.1850	4.699
3/16"					0.1875	4.763
			12		0.1890	4.801
	#10				0.1900	4.826	10-24 10-32	#26 #21	.1470" .1590"
			11		0.1910	4.851
			10		0.1935	4.915
			9		0.1960	4.978
		5mm			0.1969	5.000	M5 x 0.80	4.20mm	.1654"
			8		0.1990	5.055
			7		0.2010	5.105
			6		0.2040	5.182
			5		0.2055	5.220
			4		0.2090	5.309
			3		0.2130	5.410
	#12				0.2160	5.486	12-24 12-28	#16 #15	.1770" .1800"
		5.5mm			0.2165	5.500
			2		0.2210	5.613
			1		0.2280	5.791
				A	0.2340	5.944
		6mm			0.2362	6.000	M6 x 1.00	5.00mm	.1969"
				B	0.2380	6.045
				C	0.2420	6.147
				D	0.2460	6.248
1/4"				E	0.2500	6.350	1/4-20 1/4-28	#7 #3	.2010"
		6.5mm			0.2559	6.500
				F	0.2570	6.528
				G	0.2610	6.629
				H	0.2660	6.756
				I	0.2720	6.909
		7mm			0.2756	7.000	M7 x 1.00	6.00mm	.2362"
				J	0.2770	7.036
				K	0.2810	7.137
				L	0.2900	7.366
				M	0.2950	7.493
		7.5mm			0.2953	7.500
				N	0.3020	7.671
5/16"					0.3125	7.938	5/16-18 5/16-24	F I	.2570" .2720"
		8mm			0.3150	8.000	M8 x 1.25 M8 x 1.00	6.70mm 7.00mm	.2638" .2756"
				O	0.3160	8.026
				P	0.3230	8.204
				Q	0.3320	8.433
		8.5mm			0.3346	8.500
				R	0.3390	8.611
				S	0.3480	8.839
		9mm			0.3543	9.000
				T	0.3580	9.093
				U	0.3680	9.347
		9.5mm			0.3740	9.500
3/8"					0.3750	9.525	3/8-16 3/8-24	5/16" Q	.3125" .3320"
				V	0.3770	9.576
				W	0.3860	9.804
		10mm			0.3937	10.000	M10 x 1.50 M10 x 1.25	8.50mm 8.70mm	.3346" .3425"
				X	0.3970	10.080
				Y	0.4040	10.260
				Z	0.4130	10.490
		10.5mm			0.4134	10.500
		11mm			0.4331	11.000
7/16"					0.4375	11.113	7/16-14 7/16-20	U 25/64"	.3680" .3906"
		11.5mm			0.4528	11.500
		12mm			0.4724	12.000	M12 x 1.75 M12 x 1.25	10.20mm 10.80mm	.4016" .4252"
		12.5mm			0.4921	12.500
1/2"					0.5000	12.700	1/2-13 1/2-20	27/64" 29/64"	.4219" .4531"
		13mm			0.5118	13.000
		13.5mm			0.5315	13.500
		14mm			0.5512	14.000	M14 x 2.00	12.00mm	.4724"
		14.5mm			0.5709	14.500
9/16"					0.5625	14.288	9/16-12 9/16-18	31/64" 33/64"	.4844" .5156"
		15mm			0.5906	15.000
		15.5mm			0.6102	15.500
5/8"					0.6250	15.875	5/8-11 5/8-18	17/32" 37/64"	.5312" .5781"
		16mm			0.6299	16.000	M16 x 2.00 M16 x 1.50	14.00mm 14.50mm	.5512" .5709"
		16.5mm			0.6496	16.500
		17mm			0.6693	17.000
11/16"					0.6875	17.463
		17.5mm			0.6890	17.500
		18mm			0.7087	18.000	M18 x 2.50 M18 x 1.50	15.50mm 16.50mm	.6102" .6496"
		18.5mm			0.7283	18.500
		19mm			0.7480	19.000
3/4"					0.7500	19.050	3/4-10 3/4-16	21/32" 11/16"	.6562" .6875"
		19.5mm			0.7677	19.500
		20mm			0.7874	20.000	M20 x 2.50 M20 x 1.50	17.50mm 18.50mm	.6890" .7283"
		20.5mm			0.8071	20.500
13/16"					0.8125	20.638
		21mm			0.8268	21.000
		21.5mm			0.8465	21.500
		22mm			0.8661	22.000	M22 x 2.50 M22 x 1.50	19.50mm 20.50mm	.7677" .8071"
7/8"					0.8750	22.225	7/8-9 7/8-14	49/64" 13/16"	.7656" .8125"
		22.5mm			0.8858	22.500
		23mm			0.9055	23.000
		23.5mm			0.9252	23.500
15/16"					0.9375	23.813
		24mm			0.9449	24.000	M24 x 3.00 M24 x 2.00	21.00mm 22.00mm	.8268" .8661"
		24.5mm			0.9646	24.500
		25mm			0.9843	25.000
1"					1.0000	25.400	1-8 1-12	7/8" 59/64"	.8750" .9219"