Drill Bit Size Chart: Tap Drill Sizes, Inch and Metric

Any drilling project must consider the diameters of the drill bits. The size of the drill bit influences how big the hole will be, and different sizes are suitable for various materials and uses. Anyone who uses a drill, whether for DIY projects or industrial applications, must be familiar with drill bit sizes. The fundamentals of drill bit sizes and how to select the appropriate size for your job are covered in this article.

Types of Drill Bits

Drill bits come in a variety of forms, each with a unique function and set of characteristics. Here are a few of the most popular drill bit varieties and their typical numerical values:

1. Twist Drill Bits: The most popular kind of drill bits, these can be used to drill into plastic, metal, and wood. Typically, the numerical value falls between 1/16 and 1 inch.
2. Brad Point Drill Bits: These have a pointed tip that helps keep the bit from wandering and are made specifically for drilling into wood. Typically, the numerical number falls between 1/8 inch and 1 inch.
3. Spade drill bits: are used to make large holes in soft materials like wood because they have a flat, paddle-like tip. Typically, the numerical number falls between 1/4 inch and 1-1/2 inches.
4. Forstner Drill Bits: These are used to drill holes with flat bottoms in soft materials like wood. Typically, the numerical number falls between 1/4 inch and 2 inches.
5. Hole Saw Drill Bits: These are used to drill huge holes in a variety of materials, including metal and wood. Typically, the numerical number falls between 3/4 inch and 6 inches.
6. Masonry Drill Bits: These are used to drill through masonry materials including brick, concrete, and more. Typically, the numerical number falls between 1/8 inch and 1 inch.
7. Drill bits for countersinking: screws and other fasteners are known as countersink drill bits. Typically, the numerical number falls between 1/8 inch and 1 inch.
8. Step drill bits: are used to drill holes of various diameters since they have several stepped sizes on a single bit. The numerical value usually falls between 1/4 and 1-3/8 inches.
9. Auger drill bits: are used to make deep holes in soft materials like wood. Typically, the numerical number falls between 1/4 inch and 1-1/2 inches. can be as small as 0.05 mm, while the largest can be several inches in diameter.

Drill Bit Sizes

Typically, drill bit sizes are expressed in inches or millimeters. The diameter of a drill bit, or the distance across the widest point of the bit, establishes its size. The size of the hole that can be drilled increases with diameter. While the largest drill bit sizes can have a diameter of several inches, the smallest can be as little as 0.05 mm.

Between 1/16 inch and 1 inch are the most popular drill bit sizes, with smaller sizes being utilized for finer work and bigger sizes for more demanding applications. For instance, a 1 inch bit would be better for drilling large holes in heavy metal or wood, while a 1/16 inch bit would be suitable for drilling little holes in delicate materials like jewelry.

The material being drilled must be taken into account when selecting a drill bit size. Larger bits can be used to drill through softer materials like wood and plastic, whereas smaller bits are needed to drill through tougher materials like metal and concrete. The material being drilled can be protected from injury by selecting the proper bit size, and the hole will be the appropriate size and shape for the task.

The type of drill being used is another aspect to take into account when selecting a drill bit size. The size of the drill bit that can be used may be restricted by the chuck diameters of various types of drills. Verify that the drill bit being used is compatible with the drill before using it.

One typical error when selecting drill bit sizes is presuming that the size of the bit and the hole that will be drilled are the same. This isn’t always the case, though, as the drill bit’s angle and the material being drilled can both alter the size of the hole. Prior to beginning the real drilling operation, it is wise to test a drill bit on a scrap of material.

How to Measure Drill Bits

Several techniques can be used to measure drill bits. These are three typical methods for measuring drill bits:

1. Using a ruler or tape measure: Place the drill bit on a level surface and measure the distance between the ends of the bit. To achieve an accurate measurement, be careful to take it from the farthest places on each end.
2. Making use of a drill bit gauge: A drill bit gauge is a little gadget with a variety of holes that range in size. Simply place the drill bit into the hole that it fits into most comfortably to use it, and the gauge will display the drill bit’s size.
3. Using a micrometer: A micrometer is a highly accurate measuring instrument that may be used to determine the diameter of drill bits. To use it, set the drill bit in between the micrometer’s two anvils and gauge the bit’s size using the micrometer’s reading scale.
   Whatever method you choose, be sure to thoroughly clean the drill bit first to achieve an accurate measurement.

Metric Drill Bit Sizes and Country Using

Metric drill bit sizes are commonly used in countries that use the metric system. Here are some of the most common metric drill bit sizes:

• 1.0 mm
• 1.5 mm
• 2.0 mm
• 2.5 mm
• 3.0 mm

Countries that employ the metric system, a method of measurement based on the International System of Units, utilize metric drill bit sizes (SI).

The majority of nations on earth employ the metric system, including:

Canada
Mexico
Australia
In New Zealand
most nations in Asia, including China and Japan, most nations in Europe, including the United Kingdom
majority of South American nations majority of African nations
The imperial system, which uses inches, feet, and yards, is still in use in some nations, including the United States. Drill bit sizes are commonly measured in inches rather than metric sizes in the United States.

Drill Size Chart for Number and Letter Gauges

A helpful resource for choosing the appropriate drill bit size for various applications is the drill size table for number and letter gauges. For each number and letter gauge, the chart indicates the drill size in inches, ranging from 80 to 10. The drill bit size increases as the gauge number drops. For jobs like drilling screwholes or making pilot holes for bigger drill bits, this chart is especially helpful. The final product will be more secure and effective if the proper drill bit size is chosen to guarantee that the holes are the proper size for the intended use.

Drill Bit Size Gauge

A gadget used to determine drill bit sizes is called a drill bit size gauge. Typically, it comprises of a flat piece of metal or plastic with numerous holes labeled with the appropriate bit sizes bored into it. Simply place the drill bit into the hole that corresponds to its size to use the gauge, and the gauge will show the size of the bit. This is a useful tool to have in a workshop or tool box since it enables you to rapidly determine the ideal drill bit size for a task, assuring accuracy and effectiveness. For even more accurate measurements, digital drill bit size gauges that measure the bit’s diameter using sensors are also available.

Drill Size Chart – Fractional Sizes

Drill Size (in)	Diameter			Drill Size (in)	Diameter
Inches (in)	Millimeters (mm)	Inches (in)	Millimeters (mm)
1/64	0.0156	0.3969	49/64	0.7656	19.4469
1/32	0.0313	0.7938	25/32	0.7813	19.8438
3/64	0.0469	1.1906	51/64	0.7969	20.2406
1/16	0.0625	1.5875	13/16	0.8125	20.6375
5/64	0.0781	1.9844	53/64	0.8281	21.0344
3/32	0.0938	2.3813	27/32	0.8438	21.4313
7/64	0.1094	2.7781	55/64	0.8594	21.8281
1/8	0.125	3.175	7/8	0.875	22.225
9/64	0.1406	3.5719	57/64	0.8906	22.6219
5/32	0.1563	3.9688	29/32	0.9063	23.0188
11/64	0.1719	4.3656	59/64	0.9219	23.4156
3/16	0.1875	4.7625	15/16	0.9375	23.8125
13/64	0.2031	5.1594	61/64	0.9531	24.2094
7/32	0.2188	5.5563	31/32	0.9688	24.6063
15/64	0.2344	5.9531	63/64	0.9844	25.0031
1/4	0.25	6.35	1	1	25.4
17/64	0.2656	6.7469	1-1/64	1.0156	25.7969
9/32	0.2813	7.1438	1-1/32	1.0313	26.1938
19/64	0.2969	7.5406	1-3/64	1.0469	26.5906
5/16	0.3125	7.9375	1-1/16	1.0625	26.9875
21/64	0.3281	8.3344	1-5/64	1.0781	27.3844
11/32	0.3438	8.7313	1-3/32	1.0938	27.7813
23/64	0.3594	9.1281	1-7/64	1.1094	28.1781
3/8	0.375	9.525	1-1/8	1.125	28.575
25/64	0.3906	9.9219	1-9/64	1.1406	28.9719
13/32	0.4063	10.3188	1-5/32	1.1563	29.3688
27/64	0.4219	10.7156	1-1/64	1.1719	29.7656
7/16	0.4375	11.1125	1-3/16	1.1875	30.1625
29/64	0.4531	11.5094	1-13/64	1.2031	30.5594
15/32	0.4688	11.9063	1-7/32	1.2188	30.9563
31/64	0.4844	12.3031	1-15/64	1.2344	31.3531
1/2	0.5	12.7	1-1/4	1.25	31.75
33/64	0.5156	13.0969	1-17/64	1.2656	31.1469
17/32	0.5313	13.4938	1-9/32	1.2813	32.5438
35/64	0.5469	13.8906	1-19/64	1.2969	32.9406
9/16	0.5625	14.2875	1-5/16	1.3125	33.3375
37/64	0.5781	14.6844	1-21/64	1.3281	33.7344
19/32	0.5938	15.0813	1-11/32	1.3438	34.1313
39/64	0.6094	15.4781	1-23/64	1.3594	34.5281
5/8	0.625	15.875	1-3/8	1.375	34.925
41/64	0.6406	16.2719	1-25/64	1.3906	35.3219
21/32	0.6563	16.6688	1-13/32	1.4063	35.7188
43/64	0.6719	17.0656	1-27/64	1.4219	36.1156
11/16	0.6875	17.4625	1-7/16	1.4375	36.5125
45/64	0.7013	17.8594	1-29/64	1.4531	36.9094
23/32	0.7188	18.2563	1-15/32	1.4688	37.3063
47/64	0.7344	18.6531	1-31/64	1.4844	37.7031
3/4	0.75	19.05	1-1/2	1.5	38.1

Drill Size Chart – Wire Gauge and Letter

Drill Size	Diameter			Drill Size	Diameter
Inches (in)	Millimeters (mm)	Inches (in)	Millimeters (mm)
#107	0.0019	0.0483	#40	0.0980	2.4892
#106	0.0023	0.0584	#39	0.0995	2.5273
#105	0.0027	0.0686	#38	0.1015	2.5781
#104	0.0031	0.0787	#37	0.1040	2.6416
#103	0.0035	0.0889	#36	0.1065	2.7051
#102	0.0039	0.0991	#35	0.1100	2.7940
#101	0.0043	0.1092	#34	0.1110	2.8194
#100	0.0047	0.1194	#33	0.1130	2.8702
#99	0.0051	0.1295	#32	0.1160	2.9464
#98	0.0055	0.1397	#31	0.1200	3.0480
#97	0.0059	0.1499	#30	0.1285	3.2639
#96	0.0063	0.1600	#29	0.1360	3.4544
#95	0.0067	0.1702	#28	0.1405	3.5687
#94	0.0071	0.1803	#27	0.1440	3.6576
#93	0.0075	0.1905	#26	0.1470	3.7338
#92	0.0079	0.2007	#25	0.1495	3.7973
#91	0.0083	0.2108	#24	0.1520	3.8608
#90	0.0087	0.2210	#23	0.1540	3.9116
#89	0.0091	0.2311	#22	0.1570	3.9878
#88	0.0095	0.2413	#21	0.1590	4.0386
#87	0.0100	0.2540	#20	0.1610	4.0894
#86	0.0105	0.2667	#19	0.1660	4.2164
#85	0.0110	0.2794	#18	0.1695	4.3053
#84	0.0115	0.2921	#17	0.1730	4.3942
#83	0.0120	0.3048	#16	0.1770	4.4958
#82	0.0125	0.3175	#15	0.1800	4.5720
#81	0.0130	0.3302	#14	0.1820	4.6228
#80	0.0135	0.3429	#13	0.1850	4.6990
#79	0.0145	0.3680	#12	0.1890	4.8006
#78	0.0160	0.4064	#11	0.1910	4.8514
#77	0.0180	0.4572	#10	0.1935	4.9149
#76	0.0200	0.5080	#9	0.1960	4.9784
#75	0.0210	0.5334	#8	0.1990	5.0546
#74	0.0225	0.5715	#7	0.2010	5.1054
#73	0.0240	0.6096	#6	0.2040	5.1816
#72	0.0250	0.6350	#5	0.2055	5.2197
#71	0.0260	0.6604	#4	0.2090	5.3086
#70	0.0280	0.7112	#3	0.2130	5.4102
#69	0.0292	0.7417	#2	0.2210	5.6134
#68	0.0310	0.7874	#1	0.2280	5.7912
#67	0.0320	0.8128	A	0.2340	5.9436
#66	0.0330	0.8382	B	0.2380	6.0452
#65	0.0350	0.8890	C	0.2420	6.1468
#64	0.0360	0.9144	D	0.2460	6.2484
#63	0.0370	0.9398	E	0.2500	6.3500
#62	0.0380	0.9652	F	0.2570	6.5278
#61	0.0390	0.9906	G	0.2610	6.6294
#60	0.0400	1.0160	H	0.2660	6.7564
#59	0.0410	1.0414	I	0.2720	6.9088
#58	0.0420	1.0668	J	0.2770	7.0358
#57	0.0430	1.0922	K	0.2810	7.1374
#56	0.0465	1.1811	L	0.2900	7.3660
#55	0.0520	1.3208	M	0.2950	7.4930
#54	0.0550	1.3970	N	0.3020	7.6708
#53	0.0595	1.5113	O	0.3160	8.0264
#52	0.0635	1.6129	P	0.3230	8.2042
#51	0.0670	1.7018	Q	0.3320	8.4328
#50	0.0700	1.7780	R	0.3390	8.6106
#49	0.0730	1.8542	S	0.3480	8.8392
#48	0.0760	1.9304	T	0.3580	9.0932
#47	0.0785	1.9939	U	0.3680	9.3472
#46	0.0810	2.0574	V	0.3770	9.5758
#45	0.0820	2.0828	W	0.3860	9.8044
#44	0.0860	2.1844	X	0.3970	10.0838
#43	0.0890	2.2606	Y	0.4040	10.2616
#42	0.0935	2.3749	Z	0.4130	10.4902
#41	0.0960	2.4384	—	—	—

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Drill Size Chart – Metric Sizes

Drill Size (mm)	Diameter			Drill Size (mm)	Diameter
Inches (in)	Millimeters (mm)	Inches (in)	Millimeters (mm)
0.05	0.0020	0.05	7.9	0.3110	7.9
0.1	0.0039	0.1	8	0.3150	8
0.2	0.0079	0.2	8.1	0.3189	8.1
0.3	0.0118	0.3	8.2	0.3228	8.2
0.4	0.0158	0.4	8.3	0.3268	8.3
0.5	0.0197	0.5	8.4	0.3307	8.4
0.6	0.0236	0.6	8.5	0.3347	8.5
0.7	0.0276	0.7	8.6	0.3386	8.6
0.8	0.0315	0.8	8.7	0.3425	8.7
0.9	0.0354	0.9	8.8	0.3465	8.8
1	0.0394	1	8.9	0.3504	8.9
1.1	0.0433	1.1	9	0.3543	9
1.2	0.0472	1.2	9.1	0.3583	9.1
1.3	0.0512	1.3	9.2	0.3622	9.2
1.4	0.0551	1.4	9.3	0.3661	9.3
1.5	0.0591	1.5	9.4	0.3701	9.4
1.6	0.0630	1.6	9.5	0.3740	9.5
1.7	0.0669	1.7	9.6	0.3780	9.6
1.8	0.0709	1.8	9.7	0.3819	9.7
1.9	0.0748	1.9	9.8	0.3858	9.8
2	0.0787	2	9.9	0.3898	9.9
2.1	0.0827	2.1	10	0.3937	10
2.2	0.0866	2.2	10.5	0.4134	10.5
2.3	0.0906	2.3	11	0.4331	11
2.4	0.0945	2.4	11.5	0.4528	11.5
2.5	0.0984	2.5	12	0.4724	12
2.6	0.1024	2.6	12.5	0.4921	12.5
2.7	0.1063	2.7	13	0.5118	13
2.8	0.1102	2.8	13.5	0.5315	13.5
2.9	0.1142	2.9	14	0.5512	14
3	0.1181	3	14.5	0.5709	14.5
3.1	0.1221	3.1	15	0.5906	15
3.2	0.1260	3.2	15.5	0.6102	15.5
3.3	0.1299	3.3	16	0.6299	16
3.4	0.1339	3.4	16.5	0.6496	16.5
3.5	0.1378	3.5	17	0.6693	17
3.6	0.1417	3.6	17.5	0.6890	17.5
3.7	0.1457	3.7	18	0.7087	18
3.8	0.1496	3.8	18.5	0.7284	18.5
3.9	0.1535	3.9	19	0.7480	19
4	0.1575	4	19.5	0.7677	19.5
4.1	0.1614	4.1	20	0.7874	20
4.2	0.1654	4.2	20.5	0.8071	20.5
4.3	0.1693	4.3	21	0.8268	21
4.4	0.1732	4.4	21.5	0.8465	21.5
4.5	0.1772	4.5	22	0.8661	22
4.6	0.1811	4.6	22.5	0.8858	22.5
4.7	0.1850	4.7	23	0.9055	23
4.8	0.1890	4.8	23.5	0.9252	23.5
4.9	0.1929	4.9	24	0.9449	24
5	0.1969	5	24.5	0.9646	24.5
5.1	0.2008	5.1	25	0.9843	25
5.2	0.2047	5.2	25.5	1.0039	25.5
5.3	0.2087	5.3	26	1.0236	26
5.4	0.2126	5.4	26.5	1.0433	26.5
5.5	0.2165	5.5	27	1.0630	27
5.6	0.2205	5.6	27.5	1.0827	27.5
5.7	0.2244	5.7	28	1.1024	28
5.8	0.2284	5.8	28.5	1.1221	28.5
5.9	0.2323	5.9	29	1.1417	29
6	0.2362	6	29.5	1.1614	29.5
6.1	0.2402	6.1	30	1.1811	30
6.2	0.2441	6.2	30.5	1.2008	30.5
6.3	0.2480	6.3	31	1.2205	31
6.4	0.2520	6.4	31	1.2402	31
6.5	0.2559	6.5	32	1.2598	32
6.6	0.2598	6.6	32	1.2795	32
6.7	0.2638	6.7	33	1.2992	33
6.8	0.2677	6.8	33	1.3189	33
6.9	0.2717	6.9	34	1.3386	34
7	0.2756	7	34	1.3583	34
7.1	0.2795	7.1	35	1.3780	35
7.2	0.2835	7.2	35	1.3976	35
7.3	0.2874	7.3	36	1.4173	36
7.4	0.2913	7.4	36	1.4370	36
7.5	0.2953	7.5	37	1.4567	37
7.6	0.2992	7.6	37	1.4764	37
7.7	0.3032	7.7	38	1.4961	38
7.8	0.3071	7.8	—	—	—

Tap Drill Chart (mm and inches)

TAP SIZE		CUTTING TAPS		TRU-FLO ™ FORMING TAPS
INCH	METRIC	DRILL SIZE	DECIMAL EQUIVALENT	DRILL SIZE	DECIMAL EQUIVALENT
0-80		3/64	.0469	54	.0550
	M1.6 X 0.35	1.25mm	.0492	1.45mm	.0571
	M1.8 X 0.35	1.45mm	.0571	1.65mm	.0650
1-64		53	.0595	51	.0650
1-72		53	.0595	51	.0650
	M2 X 0.40	1.60mm	.0630	1.80mm	.0709
2-56		50	.0700	5/64	.0781
2-64		50	.0700	47	.0785
	M2.2 X 0.45	1.75mm	.0689	2.00mm	.0787
	M2.5 X 0.45	2.05mm	.0807	2.30mm	.0906
3-48		47	.0785	43	.0890
3-56		46	.0810	2.30mm	.0905
4-40		43	.0890	38	.1015
4-48		42	.0935	2.60mm	.1024
	M3 X 0.50	2.50mm	.0984	7/64	.1094
5-40		38	.1015	33	.1130
5-44		37	.1040	2.90mm	.1142
	M3.5 X 0.60	2.90mm	.1142	3.20mm	.1260
6-32		36	.1065	1/8	.1250
6-40		33	.1130	3.25mm	.1280
	M4 X 0.70	3.30mm	.1299	3.70mm	.1457
8-32		29	.1360	25	.1495
8-36		29	.1360	24	.1520
	M4.5 X 0.75	3.70mm	.1476	4.10mm	.1614
10-24		26	.1470	11/64	.1719
10-32		21	.1590	16	.1770
	M5 X 0.80	4.20mm	.1654	14	.1820
12-24		16	.1770	5mm	.1969
12-28		15	.1800	7	.2010
	M6 X 1.00	5.00mm	.1969	7/32	.2188
1/4-20		7	.2010	1	.2280
1/4-28		3	.2130	15/64	.2340
	M7 X 1.00	6.00mm	.2362	F	.2570
5/16-18		F	.2570	L	.2900
5/16-24		I	.2720	M	.2950
	M8 X 1.25	6.70mm	.2638	7.40mm	.2913
	M8 X 1.0	7.00mm	.2756	19/64	.2969
3/8-16		5/16	.3125	S	.3480
3/8-24		Q	.3320	T	.3580
	M10 X 1.50	8.50mm	.3346	U	.3680
	M10 X 1.25	8.70mm	.3425	9.40mm	.3701
7/16-14		U	.3680	Y	.4040
7/16-20		25/64	.3906	Z	.4130
	M12 X 1.75	10.20mm	.4016	11.20mm	.4409
	M12 X 1.25	10.80mm	.4252	11.50mm	.4528
1/2-13		27/64	.4219	15/32	.4682
1/2-20		29/64	.4531	12.25mm	.4823
	M14 X 2.00	12.00mm	.4224	33/64	.5156
9/16-12		31/64	.4844	17/32	.5312
9/16-18		33/64	.5156	13.50mm	.5315
5/8-11		17/32	.5312	14.75mm	.5807
5/8-18		37/64	.5781	15.25mm	.6004
	M16 X 2.00	14.00mm	.5512	19/32	.5938
	M16 X 1.50	14.50mm	.5906	15.25mm	.6004
	M18 X 2.50	15.50mm	.6102	39/64	.6094
	M18 X 1.50	16.50mm	.6496	17.25mm	.6791
3/4-10		21/32	0.6562	45/64	0.7031
3/4-16		11/16	0.6875	23/32	0.7188
	M20 X 2.50	17.50mm	0.689
	M20 X 1.50	18.50mm	0.7283
	M22 X 2.50	19.50mm	0.7677
	M22 X 1.50	20.50mm	0.8071
7/8-9		49/64	0.7656
7/8-14		13/16	0.8125
	M24 X 3.00	21.00mm	0.8268
	M24 X 2.00	22.00mm	0.8661
1-8		7/8	0.875
1-12		59/64	0.9219
	M27 X 3.00	24.00mm	0.9449
	M27 X 2.00	25.00mm	0.9843
1-1/8-7		63/64	0.9844
1-1/8-12		1-3/64	1.0469
	M30 X 3.50	26.50mm	1.0433
	M30 X 2.00	28.00mm	1.1024
1-1/4-7		1-7/64	1.1094
1-1/4-12		1-11/64	1.1719
	M33 X 3.50	29.50mm	1.1614
	M33 X 2.00	31.00mm	1.2205
1-3/8-6		1-7/32	1.2188
1-3/8-12		1-19/64	1.2969
	M36 X 4.00	32.00mm	1.2598
	M36 X 3.00	33.00mm	1.2992
1-1/2-6		1-11/32	1.3438
1-1/2-12		1-27/64	1.4219
	M39 X 4.00	35.00mm	1.378
	M39 X 3.00	36.00mm	1.4173

---

Pipe Thread Drilled Hole Sizes

NOMINAL  SIZE	NPT	NPTF	NPSC	NPSM	NPSF	NPSI	BSPT	BSPP
1/16 – 27	D (0.246)	D (0.246)	0.25		0.25	0.25
1/8 – 27	Q (0.332)	Q (0.332)	0.3437	0.3593	0.3437	0.3437
1/8 – 28							0.3281	0.3437
1/4 – 18	0.4375	0.4375	0.4375	0.4687	0.4375	0.4375
1/4 – 19							0.4375	0.4531
3/8 – 18	0.5625	0.5781	0.5781	0.6093	0.5781	0.5781
3/8 – 19							0.5781	0.5937
1/2 – 14	0.7031	0.7031	0.7187	0.75	0.7187	0.7187	0.7187	0.7343
5/8 – 14								0.8125
3/4 – 14	0.9062	0.9218	0.9218	0.9646			0.938	0.965
7/8 – 14								1.1093
1 – 11							1.1718	1.1875
1 – 11-1/2	1.1406	1.1562	1.1562	1.2031
1-1/4 – 11							1.5	1.5468
1-1/4 – 11-1/2	1.4843	1.5	1.5	1.5468
1-1/2 – 11							1.75	1.7656
1-1/2 – 11-1/2	1.7343	1.7343	1.75	1.7913
1-3/4 – 11								2
2 – 11							2.2187	2.25
2 – 11-1/2	2.2031	2.2187	2.2187	2.2638

Tap Drill Size Chart For Standard Threads, Tap Drill Size Chart mm

Tap Size	Drill Size
M1 x 0.25	0.75mm
M1.1 x 0.25	0.85mm
M1.2 x 0.25	0.95mm
M1.4 x 0.30	1.10mm
M1.6 x 0.35	1.25mm
M1.8 x 0.35	1.45mm
M2 x 0.4	1.60mm
M2.2 x 0.45	1.75mm
M2.5 x 0.45	2.05mm
M3 x 0.5	2.50mm
M3.5 x 0.6	2.90mm
M4 x 0.7	3.30mm
M4.5 x 0.75	3.70mm
M5 x 0.8	4.20mm
M6 x 1	5.00mm
M7 x 1	6.00mm
M8 x 1.25	6.80mm
M9 x 1.25	7.80mm
M10 x 1.5	8.50mm
M11 x 1.5	9.50mm
M12 x 1.75	10.20mm
M14 x 2	12.00mm
M16 x 2	14.00mm
M18 x 2.5	15.50mm
M20 x 2.5	17.50mm
M22 x 2.5	19.50mm
M24 x 3	21.00mm
M27 x 3	24.00mm
M30 x 3.5	26.50mm
M33 x 3.5	29.50mm
M36 x 4	32.00mm
M39 x 4	35.00mm
M42 x 4.5	37.50mm
M45 x 4.5	40.50mm
M48 x 5	43.00mm
M52 x 5	47.00mm
M56 x 5.5	50.50mm
M60 x 5.5	54.50mm
M64 x 6	58.00mm

ANSI Drill Size Chart – ISO Metric Drill Bit Size Table.

ANSI Size Drill Bit Chart							ISO (Metric Size Drills) & Conversion to Inches
Drill (in.)	Decimal	Drill (in.)	Decimal	Drill (in.)	Decimal	Drill (mm)	Decimal (in.)	Drill (mm)	Decimal (in.)	Drill (mm)	Decimal (in.)
80	.0135	1/8	.1250	O	.3160	.35	.0138	3.4	.1339	8.0	.3150
79	.0145	30	.1285	P	.3230	.4	.0157	3.5	.1378	8.1	.3189
1/64	.0156	29	.1360	21/64	.3281	.45	.0177	3.6	.1417	8.2	.3228
78	.0160	28	.1405	Q	.3320	.5	.0197	3.7	.1457	8.25	.3248
77	.0180	9/64	.1406	R	.3390	.55	.0217	3.75	.1477	8.3	.3267
76	.0200	27	.1440	11/32	.3437	.6	.0236	3.8	.1496	8.4	.3307
75	.0210	26	.1470	S	.3480	.65	.0256	3.9	.1535	8.5	.3346
74	.0225	25	.1495	T	.3580	.7	.0276	4.0	.1575	8.6	.3386
73	.0240	24	.1520	23/64	.3594	.75	.0295	4.1	.1614	8.7	.3425
72	.0250	23	.1540	U	.3680	.8	.0315	4.2	.1654	8.75	.3445
71	.0260	5/32	.1562	3/8	.3750	.85	.0335	4.25	.1674	8.8	.3465
70	.0280	22	.1570	V	.3770	.9	.0355	4.3	.1693	8.9	.3504
69	.0292	21	.1590	W	.3860	.95	.0374	4.4	.1732	9.0	.3543
68	.0310	20	.1610	25/64	.3906	1.0	.0394	4.5	.1771	9.1	.3583
1/32	.0313	19	.1660	X	.3970	1.05	.0413	4.6	.1811	9.2	.3622
67	.0320	18	.1695	Y	.4040		1.1	.0433	4.7	.1850	9.25	.3642
66	.0330	11/64	.1719	13/32	.4062	1.15	.0453	4.75	.1870	9.35	.3661
65	.0350	17	.1730	Z	.4130	1.2	.0472	4.8	.1890	9.4	.3701
64	.0360	16	.1770	27/64	.4219	1.25	.0492	4.9	.1929	9.5	.3740
63	.0370	15	.1800	7/16	.4375	1.3	.0512	5.0	.1968	9.6	.3780
62	.0380	14	.1820	29/64	.4531	1.35	.0531	5.1	.2008	9.7	.3819
61	.0390	13	.1850	15/32	.4687	1.4	.0551	5.2	.2047	9.75	.3839
60	.0400	3/16	.1875	31/64	.4844	1.45	.0571	5.25	.2067	9.8	.3858
59	.0410	12	.1890	1/2	.5000	1.5	.0591	5.3	.2087	9.9	.3898
58	.0420	11	.1910	33/64	.5156	1.55	.0610	5.4	.2126	10.0	.3937
57	.0430	10	.1935	17/32	.5312	1.6	.0629	5.5	.2165	10.5	.4133
56	.0465	9	.1960	35/64	.5469	1.65	.0650	5.6	.2205	11.0	.4331
3/64	.0469	8	.1990	9/16	.5625	1.7	.0669	5.7	.2244	11.5	.4528
55	.0520	7	.2010	37/64	.5781	1.75	.0689	5.75	.2264	12.0	.4724
54	.0550	13/64	.2031	19/32	.5937	1.8	.0709	5.8	.2283	12.5	.4921
53	.0595	6	.2040	39/64	.6094	1.85	.0728	5.9	.2323	13.0	.5118
1/16	.0625	5	.2055	5/8	.6250	1.9	.0748	6.0	.2362	13.5	.5315
52	.0635	4	.2090	41/64	.6406	1.95	.0768	6.1	.2401	14.0	.5512
51	.0670	3	.2130	21/32	.6562	2.0	.0787	6.2	.2441	14.5	.5708
50	.0700	7/32	.2187	43/64	.6719	2.05	.0807	6.25	.2461	15.0	.5906
49	.0730	2	.2210	11/16	.6875	2.1	.0827	6.3	.2480	15.5	.6102
48	.0760	1	.2280	45/64	.7031	2.15	.0846	6.4	.2520	16.0	.6300
5/64	.0781	A	.2340	23/32	.7187	2.2	.0866	6.5	.2559	16.5	.6496
47	.0785	15/64	.2344	47/64	.7344	2.25	.0886	6.6	.2598	17.0	.6693
46	.0810	B	.2380	3/4	.7500	2.3	.0905	6.7	.2638	17.5	.6889
45	.0820	C	.2420	49/64	.7656	2.35	.0925	6.75	.2658	18.0	.7087
44	.0860	D	.2460	25/32	.7812	2.4	.0945	6.8	.2677	18.5	.7283
43	.0890	E	.2500	51/64	.7969	2.45	.0965	6.9	.2716	19.0	.7480
42	.0935	1/4	.2500	13/16	.8125	2.5	.0984	7.0	.2756	19.5	.7677
3/32	.0937	F	.2570	53/64	.8281	2.55	.1004	7.1	.2795	20.0	.7874
41	.0960	G	.2610	27/32	.8437	2.6	.1024	7.2	.2835	20.5	.8071
40	.0980	17/64	.2656	55/64	.8594	2.65	.1043	7.25	.2855	21.0	.8268
39	.0995	H	.2660	7/8	.8750	2.7	.1063	7.3	.2874	21.5	.8465
38	.1015	I	.2720	57/64	.8906	2.75	.1083	7.4	.2913	22.0	.8661
37	.1040	J	.2770	29/32	.9062	2.8	.1102	7.5	.2953	22.5	.8858
36	.1065	K	.2811	59/64	.9219	2.9	.1142	7.6	.2990	23.0	.9055
7/64	.1093	9/32	.2812	15/16	.9375	3.0	.1181	7.7	.3031	23.5	.9252
35	.1100	L	.2900	61/64	.9531	3.1	.1220	7.75	.3051	24.0	.9449
34	.1110	M	.2950	31/32	.9687	3.2	.1260	7.8	.3071	24.5	.9646
33	.1130	19/64	.2968	63/64	.9844	3.25	.1280	7.9	.3110	25.0	.9843
32	.1160	N	.3020	1	1.000	3.3	.1299
31	.1200	5/16	.3125

Centre Drill Bit Sizes

To make a small hole in the middle of a workpiece that will act as a guide for a bigger drill bit like drill bits for metals, utilize center drill bits. Although bigger sizes can be produced for specialized purposes, center drill bits are normally available in standard sizes from 1/16 inch to 1/2 inch.

The most typical sizes for center drill bits are:

• 1 Centre Drill Bit: 1/16 inch drill bit with a 60-degree angle.

• 2 Centre Drill Bit: A 3/32 inch, 60-degree-angled drill bit.

• 3 Centre Drill Bit: a 7/64-inch, 60-degree angled drill bit.

• 4 Centre Drill Bit: A drill bit measuring 1/8 inch and angled at 60 degrees.

These sizes are sometimes offered in sets with all four sizes, making them a practical addition to a workshop or toolbox. It’s crucial to select the right size for the project since utilizing an incorrectly sized center drill bit might lead to imprecise drilling or workpiece damage.

Size designation	Drill diameter [inches (mm)]
5/0	0.010 in (0.254 mm)
4/0	0.015 in (0.381 mm)
3/0	0.020 in (0.508 mm)
2/0	0.025 in (0.635 mm)
0	1/32 in (0.794 mm)
1	3/64 in (1.191 mm)
2	5/64 in (1.984 mm)
3	7/64 in (2.778 mm)
4	1/8 in (3.175 mm)
4½	9/64 in (3.572 mm)
5	3/16 in (4.763 mm)
6	7/32 in (5.556 mm)
7	1/4 in (6.350 mm)
8	5/16 in (7.938 mm)
Gauge	Body diameter  [inches (mm)]
BS1	1/8 in (3.175 mm)
BS2	3/16 in (4.763 mm)
BS3	1/4 in (6.350 mm)
BS4	5/16 in (7.938 mm)
BS5	7/16 in (11.113 mm)
BS5A	1/2 in (12.700 mm)
BS6	5/8 in (15.875 mm)
BS7	3/4 in (19.050 mm)

Tips for Choosing the Right Drill Bit Size

To guarantee that you drill the proper size hole in your material, selecting the appropriate drill bit size is crucial. The following advice will help you select the correct drill bit size:

1. Know the material: Different materials require different drill bit sizes. Knowing the substance you are drilling into is therefore crucial. For instance, a different size bit is needed for wood than for metal.
2. Decide the size of the hole: You must know the size of the hole you intend to make before choosing the drill bit. This will help you choose the proper size drill bit.
3. Examine the drill bit table: For help choosing the correct size bit for your job, use a drill bit chart. You can use the chart to match the right bit size to the desired size of the hole you want to make.
4. Consider the drill bit type: Drill bits come in a variety of varieties and are made for various uses. For instance, masonry bits are great for drilling into concrete or brick, whereas twist bits work best for drilling wood.
5. Use a test piece: If you’re unsure about the correct drill bit size, use a test piece of material to try different sizes until you find the right one.
6. Take safety precautions: Always wear eye protection and gloves when drilling to avoid injury.
   These guidelines will help you select the appropriate drill bit size for your project and guarantee that your holes are the proper size and form.

WHAT IS THE DRILL BIT SIZE CHART FOR SCREWS?

It can be difficult to grasp the drill bit size chart for screws if you are new to woodworking or DIY projects. To guarantee that your job turns out flawlessly, it is essential to select the appropriate drill bit size for your screw. In this article, we will break down everything you need to know about the drill bit size chart for screws.

Let’s start by defining a drill bit size chart. A table listing the various drill bit sizes and the accompanying screw sizes they can accommodate is known as a drill bit size chart. The drill bit diameter, suggested pilot hole size, and screw size are normally listed on the chart.

You must be aware of the size of the screw you’ll be using in order to use a drill bit size chart for screws. If your screw is 1/4 inch, for instance, you will need a drill bit that is just a little smaller than 1/4 inch. This is necessary because you want the screw’s pilot hole to be smaller than its actual hole so that once the screw is inserted, it may form its own threads.

Here is a screw drill bit size chart:

Here is a drill bit size chart for screws:

Screw Size Pilot Hole Size Drill Bit Size

#2 1/16 inch 3/32 inch

#4 3/32 inch 1/8 inch

#6 7/64 inch 5/32 inch

#8 1/8 inch 3/16 inch

#10 9/64 inch 7/32 inch

#12 5/32 inch 1/4 inch

1/4 inch 11/64 inch 5/16 inch

5/16 inch 9/32 inch 11/32 inch

3/8 inch 5/16 inch 3/8 inch

1/2 inch 7/16 inch 1/2 inch

The size of the pilot hole will vary based on the type of wood or material you are dealing with, so it’s important to keep in mind that this is only a general reference. To avoid splitting, hardwood will need a larger pilot hole than softwood. Similar to this, you might need to use a different size pilot hole if you’re working with metal or plastic.

In conclusion, it is essential for each DIY project to grasp the drill bit size chart for screws. By using the proper drill bit size, you can ensure that your screws fit securely and snugly, protecting your project from damage. Use this chart as a starting point and make any required adjustments to the pilot hole size based on the material you are dealing with. Enjoy your drilling!

Here’s a drill bit size chart for screws based on the screw size:

WHAT IS THE DRILL BIT SIZE CHART FOR SCREWS?

Screw Size	Pilot Hole Size (in inches)	Pilot Hole Size (in millimeters)
#2	1/32	0.8
#3	3/64	1.2
#4	1/16	1.6
#5	5/64	2.0
#6	3/32	2.4
#7	7/64	2.8
#8	1/8	3.2
#9	9/64	3.6
#10	5/32	4.0
#12	3/16	4.8
#14	7/32	5.6
#16	1/4	6.4

Final Talk

In conclusion, drill bit sizes are a crucial consideration for any drilling activity. The material being drilled won’t be harmed, the project will be finished safely and effectively, and the hole will be the proper size and shape if the right size is chosen. You may select the ideal size for your needs and obtain outstanding results by understanding the fundamentals of drill bit sizes and taking into account the material being drilled, the type of drill being used, and any other aspects particular to the project.