Form Tap Drill Chart

HOW TO USE A FORM TAP DRILL CHART?

The best thing to do is find a tap drill clearance chart you can print, just like the one we offer in this article and print it for your lab so your team can easily access it. A drill size chart contains drill sizes and thread data that is so large that is almost impossible for a mechanical engineer to remember it all.

Download the Chart for FREE FORM TAP DRILL CHART

Tap Size		Cutting Taps			Forming Taps				CL Hole/Normal Fit		CL Hole/Close Fit		75% Thread for Aluminium, Brass, & Plastics		50% Thread for Steel, Stainless , & Iron
Inch	Metric	Drill Size	Dec. Eq./ Inches	CM	Drill Size	Dec. Eq/ Inches	CM	Closest Fractional	Inch	mm	Inch	mm	Drill Size	Dec. Eq.	Drill Size	Dec. Eq.
0-80		3/64	0.0469	0.1191	54	0.055	0.1397	3/64″	0.073	1.8542	0.067	1.7018	3/64	0.0469	55	0.052
	M1.6 X 0.35	1.25MM	0.0492	0.125	1.45MM	0.0571	0.145
	M1.8 X 0.35	1.45MM	0.0571	0.145	1.65MM	0.065	0.1651
1-64		53	0.0595	0.1511	51	0.067	0.1702		0.089	2.2606	0.081	2.0574	53	0.0595	2021-01-16 00:00:00	0.0625
1-72		53	0.0595	0.1511	51	0.067	0.1702	1/16″	0.089	2.2606	0.081	2.0574	53	0.0595	52	0.0635
	M2 X 0.40	1.60MM	0.063	0.16	1.80MM	0.0709	0.1801
2-56		50	0.07	0.1778	5/64	0.0781	0.1984		0.106	2.6924	0.094	2.3876	50	0.07	49	0.073
2-64		50	0.07	0.1778	47	0.0785	0.1994		0.106	2.6924	0.094	2.3876	50	0.07	48	0.076
	M2.2 X 0.45	1.75MM	0.0689	0.175	2.00MM	0.0787	0.1999
	M2.5 X 0.45	2.05MM	0.0807	0.205	2.30MM	0.0906	0.2301
3-48		47	0.0785	0.1994	43	0.089	0.2261	5/64″	0.12	3.048	0.106	2.6924	47	0.0785	44	0.086
3-56		46	0.081	0.2057	2.3	0.0905	0.2299		0.12	3.048	0.106	2.6924	45	0.082	43	0.089
4-40		43	0.089	0.2261	38	0.1015	0.2578	3/32″	0.136	3.4544	0.125	3.175	43	0.089	41	0.096
4-48		42	0.0935	0.2375	2.6	0.1024	0.2601	3/32″	0.136	3.4544	0.125	3.175	42	0.0935	40	0.098
	M3 X 0.50	2.50MM	0.0984	0.2499	7/64	0.1094	0.2779
5-40		38	0.1015	0.2578	33	0.113	0.287		0.154	3.9116	0.141	3.5814	38	0.1015	7/64	0.1094
5-44		37	0.104	0.2642	2.9	0.1142	0.2901		0.154	3.9116	0.141	3.5814	37	0.104	35	0.11
	M3 X 0.60	2.90MM	0.1142	0.2901	3.20MM	0.126	0.32
6-32		36	0.1065	0.2705	2021-01-08 00:00:00	0.125	0.3175	7/64″	0.17	4.318	0.154	3.9116	36	0.1065	32	0.116
6-40		33	0.113	0.287	3.25	0.128	0.3251		0.17	4.318	0.154	3.9116	33	0.113	31	0.12
	M4 X 0.70	3.30MM	0.1299	0.3299	3.70MM	0.1476	0.3749
8-32		29	0.136	0.3454	25	0.1495	0.3797		0.194	4.9276	0.18	4.572	29	0.136	27	0.144
8-36		29	0.136	0.3454	24	0.152	0.3861	9/64″	0.194	4.9276	0.18	4.572	29	0.136	26	0.147
	M4.5 X 0.75	3.70MM	0.1476	0.3749	4.10MM	0.1614	0.41
10-24		26	0.147	0.3734	11/64	0.1719	0.4366	5/32″	0.221	5.6134	0.206	5.2324	25	0.1495	20	0.161
10-32		21	0.159	0.4039	16	0.177	0.4496	5/32″	0.221	5.6134	0.206	5.2324	21	0.159	18	0.1695
	M5 X 0.75	4.20MM	0.1654	0.4201
12-24		16	0.177	0.4496	8	0.199	0.5055	11/64″					16	0.177	12	0.189
12-28		15	0.18	0.4572	7	0.201	0.5105	3/16″					14	0.182	10	0.1935
	M6 X 1.00	5.00MM	0.1969	0.5001	7/32	0.2188	0.5558
1/4-20		7	0.201	0.5105	1	0.228	0.5791	13/64″	0.281	7.1374	0.266	6.7564	7	0.201	7/32	0.2188
1/4-28		3	0.213	0.541	15/64	0.234	0.5944	7/32″	0.281	7.1374	0.266	6.7564	3	0.213	1	0.228
	M7 X 1.00	6.00MM	0.2362	0.5999	F	0.257	0.6528
5/16-18		F	0.257	0.6528	L	0.29	0.7366	17/64″	0.344	8.7376	0.328	8.3312	F	0.257	J	0.277
5/16-24		I	0.272	0.6909	M	0.295	0.7493		0.344	8.7376	0.328	8.3312	I	0.272	9/32	0.2812
	M8 X 1.25	6.70MM	0.2638	0.6701	7/40	0.2913	0.7399
	M8 X 1.0	7.00MM	0.2756	0.7	19/64	0.2969	0.7541
3/8-16		2021-05-16 00:00:00	0.3125	0.7938	S	0.348	0.8839	5/16″	0.406	10.3124	0.391	9.9314	2021-05-16 00:00:00	0.3125	Q	0.332
3/8-24		Q	0.332	0.8433	T	0.358	0.9093	21/64″	0.406	10.3124	0.391	9.9314	Q	0.332	S	0.348
	M10 X 1.50	8.50MM	0.3346	0.8499	U	0.368	0.9347
	M10 X 1.25	8.70MM	0.3425	0.87	9.4	0.3701	0.9401
7/16-14		U	0.368	0.9347	Y	0.404	1.0262	23/64″					U	0.368	25/64	0.3906
7/16-20		25/64	0.3906	0.9921	Z	0.413	1.049	25/64″					25/64	0.3906	13/32	0.4062
	M12 X 1.75	10.20MM	0.4016	1.0201	11.2	0.4409	1.1199
	M12 X 1.25	10.80MM	0.4252	1.08	11.5	0.4528	1.1501
1/2-13		27/64	0.4219	1.0716	15/32	0.4682	1.1892	27/64″	0.531	13.4874	0.516	13.1064	27/64	0.4219	29/64	0.4531
1/2-20		29/64	0.4531	1.1509	12.25	0.4823	1.225	29/64″	0.531	13.4874	0.516	13.1064	29/64	0.4531	15/32	0.4688
	M14 X 2.00	12.00MM	0.4224	1.0729	33/64	0.5156	1.3096
9/16-12		31/64	0.4844	1.2304	17/32	0.5312	1.3492	31/64″					31/64	0.4844	33/64	0.5156
9/16-18		33/64	0.5156	1.3096	13.5	0.5315	1.35	33/64″					33/64	0.5156	17/32	0.5312
5/8-11		17/32	0.5312	1.3492	14.75	0.5807	1.475	17/32″					17/32	0.5312	2021-09-16 00:00:00	0.5625
5/8-18		37/64	0.5781	1.4684	15.25	0.6004	1.525	37/64″					37/64	0.5781	19/32	0.5938
	M16 X 2.00	14.00MM	0.5512	1.4	19/32	0.5938	1.5083
	M16 X 1.50	14.50MM	0.5906	1.5001	15.25	0.6004	1.525
	M18 X 2.50	15.50MM	0.6102	1.5499	39/64	0.6094	1.5479
	M18 X 1.50	16.50MM	0.6496	1.65	17.25	0.6791	1.7249
3/4-10		21/32	0.6562	1.6667	45/64	0.7031	1.7859	21/32″					21/32	0.6562	2021-11-16 00:00:00	0.6875
3/4-16		2021-11-16 00:00:00	0.6875	1.7463	23/32	0.7188	1.8258	11/16″					2021-11-16 00:00:00	0.6875	45/64	0.7031
	M20 X 2.50	17.50MM	0.689	1.7501
	M20 X 1.50	18.50MM	0.7283	1.8499
	M22 X 2.50	19.50MM	0.7677	1.95
	M22 X 1.50	20.50MM	0.8071	2.05
7/8-9		49/64	0.7656	1.9446				49/64″					49/64	0.7656	51/64	0.7969
7/8-14		13/16	0.8125	2.0638				13/16″					13/16	0.8125	53/64	0.8281
	M24 X 3.00	21.00MM	0.8268	2.1001
	M24 X 2.00	22.00MM	0.8661	2.1999
1-8		2021-07-08 00:00:00	0.875	2.2225				7/8″					2021-07-08 00:00:00	0.875	59/64	0.9219
1-12		59/64	0.9219	2.3416				59/64″					15/16	0.9375	61/64	0.9531
	M27 X 3.00	24.00MM	0.9449	2.4
	M27 X 2.00	25.00MM	0.9843	2.5001
1-1/8-7		63/64	0.9844	2.5004				63/64″
1-1/8-12		1-3/64	1.0469	2.6591				1 3/64″
	M30 X 3.50	26.50MM	1.0433	2.65
	M30 X 2.00	28.00MM	1.1024	2.8001
1-1/4-7		1-7/64	1.1094	2.8179				1 7/64″
1-1/4-12		1-11/64	1.1719	2.9766				1 11/64″
	M33 X 3.50	29.50MM	1.1614	2.95
	M33 X 2.00	31.00MM	1.2205	3.1001
1-3/8-6		1-7/32	1.2188	3.0958				1 7/32″
1-3/8-12		1-19/64	1.2969	3.2941				1 19/64″
	M36 X 4.00	32.00MM	1.2598	3.1999
	M36 X 3.00	33.00MM	1.2992	3.3
1-1/2-6		1-11/32	1.3438	3.4133				1 11/32″
1-1/2-12		1-27/64	1.4219	3.6116				1 27/64″
	M39 X 4.00	35.00MM	1.378	3.5001
	M39 X 3.00	36.00MM	1.4173	3.5999

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