Drill Sizes

Standard Drill Sizes
All Standard Drill Size Bushings Are indicated in Green

Drill	Decimal	Drill	Decimal	Drill	Decimal	Drill	Decimal	Drill	Decimal
80	.0135"	70	.0280"	60	.0400"	51	.0670"	3/32	.0938"
79	.0145"	69	.0292"	59	.0410"	50	.0700"	41	.0960"
1/64	.0156"	68	.0310"	58	.0420"	49	.0730"	40	.0980"
78	.0160"	1/32	.0313"	57	.0430"	48	.0760"	39	.0995"
77	.0180"	67	.0320"	56	.0465"	5/64	.0781"	38	.1015"
76	.0200"	66	.0330"	3/64	.0469"	47	.0785"	37	.1040"
75	.0210"	65	.0350"	55	.0520"	46	.0810"	36	.1065"
74	.0225"	64	.0360"	54	.0550"	45	.0820"	7/64	.1094"
73	.0240"	63	.0370"	53	.0595"	44	.0860"	35	.1100"
72	.0250"	62	.0380"	1/16	.0625"	43	.0890"	34	.1110"
71	.0260"	61	.0390"	52	.0635"	42	.0935"	33	.1130"

Drill

Decimal

Drill

Decimal

Drill

Decimal

Drill

Decimal

Drill

Decimal

.1160"

.1540"

.1820"

.2055"

.2500"

.1200"

5/32

.1562"

.1850"

.2090"

1/4

.2500"

1/8

.1250"

.1570"

3/16

.1875"

.2130"

.2570"

.1285"

.1590"

.1890"

7/32

.2188"

.2610"

.1360"

.1610"

.1910"

.2210"

17/64

.2656"

.1405"

.1660"

.1935"

.2280"

.2660"

9/64

.1406"

.1695"

.1960"

.2340"

.2720"

.1440"

11/64

.1719"

.1990"

15/64

.2344"

.2770"

.1470"

.1730"

.2010"

.2380"

.2810"

.1495"

.1770"

13/64

.2031"

.2420"

9/32

.2812"

.1520"

.1800"

.2040"

.2460"

.2900"

Drill

Decimal

Drill

Decimal

Drill

Decimal

Drill

Decimal

Drill

Decimal

.2950"

23/64

.3594"

29/64

.4531"

41/64

.6406"

53/64

.8281"

19/64

.2969"

.3680"

15/32

.4688"

21/32

.6562"

27/32

.8438"

.3020"

3/8

.3750"

31/64

.4844"

43/64

.6719"

55/64

.8594"

5/16

.3125"

.3770"

1/2

.5000"

11/16

.6875"

7/8

.8750"

.3160"

.3860"

33/64

.5156"

45/64

.7031"

57/64

.8906"

.3230"

25/64

.3906"

17/32

.5313"

23/32

.7188"

29/32

.9062"

21/64

.3281"

.3970"

35/64

.5469"

47/64

.7344"

59/64

.9219"

.3320"

.4040"

9/16

.5625"

3/4

.7500"

15/16

.9375"

.3390"

13/32

.4062"

37/64

.5781"

49/64

.7656"

61/64

.9531"

11/32

.3438"

.4130

19/32

.5938"

25/32

.7812"

31/32

.9688"

.3480"

27/64

.4219"

39/64

.6094"

51/64

.7969"

63/64

.9844"

.3580"

7/16

.4375"

5/8

.6250"

13/16

.8125"

1.000"

Thread Size/ Tap Drill Size
*Indicates Size of drill to be used before tapping

American Standard Thread		ISO Metric Thread
Thread Size	Tap Drill Size (in.)*	Thread Size	Tap Drill Size(mm)*
0-80	3/64	M1 x 0.25	0.75
1-64	53	M1.1 x 0.25	0.85
1-72	53	M1.2 x 0.25	0.95
2-56	51	M1.4 x 0.3	1.10
2-64	50	M1.6 x 0.35	1.25
3-48	5/64	M1.8 x 0.35	1.45
3-56	46	M2 x 0.4	1.60
4-40	43	M2.2 x 0.45	1.75
4-48	42	M2.5 x 0.45	2.05
5-40	39	M3 x 0.5	2.50

American Standard Thread		ISO Metric Thread
Thread Size	Tap Drill Size (in.)*	Thread Size	Tap Drill Size(mm)*
5-44	37	M3.5 x 0.6	2.90
6-32	36	M4 x 0.7	3.30
6-40	33	M4.5 x 0.75	3.70
8-32	29	M5 x 0.8	4.20
8-36	29	M6 x 1	5.00
10-24	25	M7 x 1	6.00
10-32	21	M8 x 1.25	6.80
12-24	17	M9 x 1.25	7.80
12-28	15	M10 x 1.5	8.50
1/4-20	7	M11 x 1.5	9.50

American Standard Thread		ISO Metric Thread
Thread Size	Tap Drill Size (in.)*	Thread Size	Tap Drill Size(mm)*
1/4-28	3	M12 x 1.75	10.20
5/16-18	F	M14 x 2	12.00
5/16-24	I	M16 x 2	14.00
3/8-16	5/16	M18 x 2.5	15.50
3/8-24	Q	M20 x 2.5	17.50
7/16-14	U	M22 x 2.5	19.50
7/16-20	W	M24 x 3	21.00
1/2-13	27/64	M27 x 3	24.00
1/2-20	29/64	M30 x 3.5	26.50
9/16-12	31/64	M33 x 3.5	29.50

American Standard Thread		ISO Metric Thread
Thread Size	Tap Drill Size (in.)*	Thread Size	Tap Drill Size(mm)*
9/16-18	33/64	M36 x 4	32.00
5/8-11	17/32	M39 x 4	35.00
5/8-18	37/64	M42 x 4.5	37.50
3/4-10	21/32	M45 x 4.5	40.50
3/4-16	11/16	M48 x 5	43.00
7/8-9	49/64	M52 x 5	47.00
7/8-14	13/16	M56 x 5.5	50.50
1"-8	7/8	M60 x 5.5	54.50
1"-14	15/18	M64 x 6	58.00
		M68 x 6	62.00

800.523.5330
West Springfield, MA

860.986.7177
Hartford, CT

603.881.5311
Nashua, NH

800.249.1272
Otisfield, ME

service@pioneertool.com

Send mail to webmaster@pioneertool.com with questions or comments about this web site. Copyright © 2009 Pioneer Tool Supply

Send mail to webmaster@pioneertool.com with questions or comments about this web site.
Copyright © 2009 Pioneer Tool Supply