How to choose the right taps collet size for your taps

How to choose the right taps collet size for your taps ?

Tap Shank and Drive Square dimensions size shown in below chart

Tap Shank Dimensions	Tap thread size for various Industry Standards
Shank	Shank	Square	Square	ANSI	ANSI	ANSI	ISO	ISO	ISO	ISO	JIS	DIN	DIN	DIN
MM	Inch	MM	Inch	Inch	Metric	STI	529	2283	529	2283		352	353	371
									BSW	BSW
2.24	0.088	1.8	0.071					M3
								#5
2.5	0.098	2	0.079				M1	M3.5
							Thru	#6
							M2
2.5	0.098	2.1	0.083									M1		M1
												Thru		Thru
												M1.8		M1.8
2.8	0.11	2.1	0.083									M2		M2
												Thru		Thru
												M2.6		M2.6
2.8	0.11	2.24	0.088				M2.2
							M2.5
3	0.118	2.5	0.098								M1
											Thru
											M2.6
3.15	0.124	2.5	0.098				M3	M4
							#4	#8
							#5	5/32"
							1/8"
3.5	0.138	2.7	0.106									M3		M3
															3.55	0.14	2.8	0.11				M3.5	M4.5	3/16"
#6	#10
	3/16"
Shank	Shank	Square	Square	ANSI	ANSI	ANSI	ISO	ISO	ISO	ISO	JIS	DIN	DIN	DIN
MM	Inch	MM	Inch	Inch	Metric	STI	529	2283	529	2283		352	353	371
									BSW	BSW
	0.141		0.11	#0	M1.6	#1
				Thru	Thru	Thru
				#6	M3.5	#4
				1/16"		M2.2
				Thru		Thru
				1/8"		M3
4	0.157	3	0.118									M3.5		M3.5
4	0.157	3.15	0.124				M4	M5
							5/32"	M5.5
								#12
4	0.157	3.2	0.126								M3
											M3.5
	0.168		0.131	#8	M4	#5
				5/32"		M3.5
4.5	0.177	3.4	0.134									M4		M4
4.5	0.177	3.55	0.14				M4.5	M6		1/4"
							#8	1/4"
	0.194		0.152	#10	M4.5	#6
				3/16"	M5	M4
5	0.197	4	0.157				M5		3/16"		M4
							#10				M4.5
											5/32"
											3/16"
5.5	0.217	4.3	0.169
5.5	0.217	4.5	0.177								M5
											M5.5

Shank	Shank	Square	Square	ANSI	ANSI	ANSI	ISO	ISO	ISO	ISO	JIS	DIN	DIN	DIN
MM	Inch	MM	Inch	Inch	Metric	STI	529	2283	529	2283		352	353	371
									BSW	BSW
	0.22		0.165	#12		#8
				7/32"
5.6	0.22	4.5	0.177				M5.5	M7
							#12
6	0.236	4.5	0.177								M6
											1/4"
6	0.236	4.9	0.193									M4.5		M4.5
												Thru		M5
												M8		M6
												3/16"
												Thru
												5/16"
												Note 10
6.2	0.244	5	0.197								M7
											M8
6.3	0.248	5	0.197				M6	M8	1/4"	5/16"
							1/4"
	0.255		0.191	#14	M6	#10
				1/4"	M6.3	M5
Shank	Shank	Square	Square	ANSI	ANSI	ANSI	ISO	ISO	ISO	ISO	JIS	DIN	DIN	DIN
MM	Inch	MM	Inch	Inch	Metric	STI	529	2283	529	2283		352	353	371
									BSW	BSW
7	0.276	5.5	0.217								M9	M7	1/8"	M7
											M10	M9
											3/8"	M10
												3/8"
												Note 10
7.1	0.28	5.6	0.22				M7	M9		3/8"
								3/8"
	0.313		0.234	1/8"ssP
				1/16"P
8	0.315	6	0.236								M11, 7/16"
											1/8"P
8	0.315	6.2	0.244									M11		M8
8	0.315	6.3	0.248				M8	M10	5/16"	7/16"
							M11	M11
								7/16"
	0.318		0.238	5/16"	M7	#12
					M8	1/4"
						M6
	0.323		0.242	7/16"
8.5	0.335	6.5	0.256								M12
Shank	Shank	Square	Square	ANSI	ANSI	ANSI	ISO	ISO	ISO	ISO	JIS	DIN	DIN	DIN
MM	Inch	MM	Inch	Inch	Metric	STI	529	2283	529	2283		352	353	371
									BSW	BSW
9	0.354	7	0.276									M12		M9
												1/2"
9	0.354	7.1	0.28				M9	M12		1/2"
							M12	1/2"
	0.367		0.275	1/2"	M12	3/8"
					M12.5	M10
9.5	0.374	7	0.276								M13
	0.381		0.286	3/8"	M10	5/16
						M7
						M8
10	0.394	8	0.315				M10		3/8"					M10
							3/8"
10.5	0.413	8	0.315								M14
											M15
											9/16"
	0.429		0.322	9/16"	M14	7/16"
						M12
11	0.433	9	0.354								1/4"P	M14	1/4"
												9/16"
	0.438		0.328	1/8"Pls
11.2	0.441	9	0.354				M14	M14	9/16"
							M15	9/16"
							9/16"
	0.444		0.333	7/16"
				Pulley

Shank	Shank	Square	Square	ANSI	ANSI	ANSI	ISO	ISO	ISO	ISO	JIS	DIN	DIN	DIN
MM	Inch	MM	Inch	Inch	Metric	STI	529	2283	529	2283		352	353	371
									BSW	BSW
12	0.472	9	0.354									M16	3/8"
												5/8"
	0.48		0.36	5/8"	M16	1/2"
12.5	0.492	10	0.394				M16	M16	5/8"		M16
							M17	5/8"
							5/8"
	0.507		0.38	1/2"
				Pulley
13	0.512	10	0.394								M17
	0.542		0.406	11/16"	M18	9/16"
						M14
14	0.551	11	0.433								M18	M18
											3/8"P	11/16"
											11/16"
											3/4"
											Note 4
14	0.551	11.2	0.441				M18	M18	11/16"
							M20	M20	3/4"
							11/16"	11/16"
							3/4"	13/16"
							13/16"
							Note 6
	0.563		0.421	1/4"P
	0.59		0.442	3/4"		5/8"
						M16

Shank	Shank	Square	Square	ANSI	ANSI	ANSI	ISO	ISO	ISO	ISO	JIS	DIN	DIN	DIN
MM	Inch	MM	Inch	Inch	Metric	STI	529	2283	529	2283		352	353	371
									BSW	BSW
15	0.591	12	0.472								M20
											13/16"
16	0.63	12	0.472									M20	1/2"
												13/16"
16	0.63	12.5	0.492				M22	M22	7/8"
							7/8"	7/8"
	0.633		0.475	5/8"
				Pulley
	0.652		0.489	13/16"	M20
17	0.669	13	0.512								M22
											7/8"
	0.688		0.515	1/2"P
	0.697		0.523	7/8"	M22	3/4"
						M18
	0.7		0.531	3/8"P
18	0.709	14	0.551				M24	M24		1"		1/2"P
							M25	15/16"
							15/16"
							1"
							Note 7
18	0.709	14.5	0.571									M22	5/8"
												M24
												7/8"
												15/16"
Shank	Shank	Square	Square	ANSI	ANSI	ANSI	ISO	ISO	ISO	ISO	JIS	DIN	DIN	DIN
MM	Inch	MM	Inch	Inch	Metric	STI	529	2283	529	2283		352	353	371
									BSW	BSW
19	0.748	15	0.591								M24
											M25
											15/16"
											5/8"P
	0.759		0.569	3/4"
				Pulley
	0.76		0.57	15/16"	M24	M20
20	0.787	15	0.591								M26
											M27
											1"
20	0.787	16	0.63				M27	M30	1-1/8"			M27	3/4"
							M28
							M30
							1-1/8"
	0.8		0.6	1"	M25	7/8"
						M22
21	0.827	17	0.669								M28
22	0.866	17	0.669								1-1/8"
22	0.866	18	0.709									M30	7/8"
22.4	0.882	18	0.709				M32	M33	1-1/4"
							M33
							1-1/4"
	0.896		0.672	1-1/16"	M27	M24
				1-1/8"
Shank	Shank	Square	Square	ANSI	ANSI	ANSI	ISO	ISO	ISO	ISO	JIS	DIN	DIN	DIN
MM	Inch	MM	Inch	Inch	Metric	STI	529	2283	529	2283		352	353	371
									BSW	BSW
23	0.906	17	0.669								M30
	0.906		0.679	3/4"P
24	0.945	19	0.748								M32
25	0.984	19	0.748								M33
25	0.984	20	0.787				M35					M33
							M36
							1-3/8"
	1.021		0.766	1-3/16"	M30	1"
				1-1/4"		M27
26	1.024	21	0.827								M34
											M35
28	1.102	21	0.827								M36
											M38
28	1.102	22	0.866									M36
28	1.102	22.4	0.882				M39
							M40
							M42
							1-1/2"
							1-5/8"
	1.108		0.831	1-5/16"	M33	1-1/8"
				1-3/8"		M30
	1.125		0.843	1"P
30	1.181	23	0.906								M39
											M40
Shank	Shank	Square	Square	ANSI	ANSI	ANSI	ISO	ISO	ISO	ISO	JIS	DIN	DIN	DIN
MM	Inch	MM	Inch	Inch	Metric	STI	529	2283	529	2283		352	353	371
									BSW	BSW
	1.233		0.925	1-7/16"	M36	1-1/4"
				1-1/2"		M33
31.5	1.24	25	0.984				M45
							M48
32	1.26	24	0.945
															32	1.26	26	1.024							M42
	1.305		0.979	1-5/8"	M39	1-3/8"
						M36
	1.313		0.984	1-1/4"P
35.5	1.398	28	1.102				M52
							M56
36	1.417	29	1.142
																1.43		1.072	1-3/4"	M42	1-1/2"
M39
	1.5		1.125	1-1/2"P
	1.519		1.139	1-7/8"
40	1.575	32	1.26
	1.644		1.233	2"	M48
	1.769		1.327	2-1/8"
	1.875		1.406	2"P
	1.894		1.42	2-1/4"	M56
	2.019		1.514	2-3/8"
	2.1		1.575	2-1/2"
	2.225		1.669	2-5/8"	M64
				Note 11
	2.25		1.687	2-1/2"P

Shank	Shank	Square	Square	ANSI	ANSI	ANSI	ISO	ISO	ISO	ISO	JIS	DIN	DIN	DIN
MM	Inch	MM	Inch	Inch	Metric	STI	529	2283	529	2283		352	353	371
									BSW	BSW
	2.35		1.762	2-3/4"
				Note 11
	2.475		1.856	2-7/8"	M72
				Note 11
	2.543		1.907	3"
				Note 11
	2.625		1.968	3"P
	2.668		2.001	3-1/8"
				Note 11
	2.793		2.095	3-1/4"	M80
				Note 11
	2.813		2.108	3-1/2"P
	2.883		2.162	3-3/8"
				Note 11
	3		2.25	4"P
	3.008		2.256	3-1/2"
				Note 11
	3.133		2.35	3-5/8"	M90
				Note 11
	3.217		2.413	3-3/4"
				Note 11
	3.342		2.506	3-7/8"
				Note 11
	3.467		2.6	4"	M100
				Note 11
ANSI ---- ASME B94.9-1999
STI ---- Screw Thread Insert
ISO 529 ---- ISO FULL UNC/UNF
ISO 2283 ---- ISO REL UNC/UNF

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How to choose the right taps collet size for your taps

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