Tap Drill Chart Metric Tap Drill Chart Tap Speed Chart Table 302 303

USCTI TABLE 302  STANDARD TAP DIMENSIONS FOR GROUND THREADS UP TO 1"
Nominal Diameter Range (inches)		Machine Screw Size Number	Nominal Fractional Diameter (inches)	Nominal Metric Diameter (mm)	Style	Tap Dimensions (inches)
Over	To (incl.)					Overall Length	Thread Length	Square Length	Shank Diameter	Size of Square
						A	B	C	D	E
0.052	0.065	0	1/16	M1.6	1	1-5/8	5/16	3/16	0.141	0.110
0.065	0.078	1	-	M1.8	1	1-11/16	3/8	3/16	0.141	0.110
0.078	0.091	2	-	M2,M2.2	1	1-3/4	7/16	3/16	0.141	0.110
0.091	0.104	3	3/32	M2.5	1	1-13/16	1/2	3/16	0.141	0.110
0.104	0.117	4	-	-	1	1-7/8	9/16	3/16	0.141	0.110
0.117	0.130	5	1/8	M3, M3.15	1	1-15/16	5/8	3/16	0.141	0.110
0.130	0.145	6	-	M3.5	1	2	11/16	3/16	0.141	0.110
0.145	0.171	8	5/32	M4	1	2-1/8	3/4	1/4	0.168	0.131
0.171	0.197	10	3/16	M4.5, M5	1	2-3/8	7/8	1/4	0.194	0.152
0.197	0.223	12	7/32	-	1	2-3/8	15/16	9/32	0.220	0.165
0.223	0.260	14	1/4	M6, M6.3	2	2-1/2	1	5/16	0.255	0.191
0.260	0.323	-	5/16	M7, M8	2	2-23/32	1-1/8	3/8	0.318	0.238
0.323	0.395	-	3/8	M10	2	2-15/16	1-1/4	7/16	0.381	0.286
0.395	0.448	-	7/16	-	3	3-5/32	1-7/16	13/32	0.323	0.242
0.448	0.510	-	1/2	M12,M12.5	3	3-3/8	1-21/32	7/16	0.367	0.275
0.510	0.573	-	9/16	M14	3	3-19/32	1-21/32	1/2	0.429	0.322
0.573	0.635	-	5/8	M16	3	3-13/16	1-13/16	9/16	0.480	0.360
0.635	0.709	-	11/16	M18	3	4-1/32	1-13/16	5/8	0.542	0.406
0.709	0.760	-	3/4	-	3	4-1/4	2	11/16	0.590	0.442
0.760	0.823		13/16	M20	3	4-15/32	2	11/16	0.652	0.489
0.823	0.885		7/8	M22	3	4-11/16	2-7/32	3/4	0.697	0.523
0.885	0.948		15/16	M24	3	4-29/32	2-7/32	3/4	0.760	0.570
0.948	1.010		1	M25	3	5-1/8	2-1/2	13/16	0.800	0.600
1.010	1.073		1-1/16	M27	3	5-1/8	2-1/2	7/8	0.896	0.672

Table 302 303
				STYLE
Nominal Diameter						TABLE 302 LONG LENGTH				TABLE 303 SHORT LENGTH
Range-Inches		Nominal Metric Diameter	Nominal Metric Diameter		Shank Diameter	Overall Length	Thread Length	Square Length	Size ofSquare	Overall Length	Thread Length	Square Length	Size ofSquare
Over	To ( Incl. )	Inches	( mm )		D	A	B	C	E	A	B	C	E
1.010	1.073	1-1/16	M27	3	.896	5-1/8	2-1/2	7/8	.672	4	1-1/2	7/8	.672
1.073	1.135	1-1/8		3	.896	5-7/16	2-9/16	7/8	.672	4	1-1/2	7/8	.672
1.135	1.198	1-3/16	M30	3	1.021	5-7/16	2-9/16	1	.766	4	1-1/2	1	.766
1.198	1.260	1-1/4		3	1.021	5-3/4	2-9/16	1	.766	4	1-1/2	1	.766
1.260	1.323	1-5/16	M33	3	1.108	5-3/4	2-9/16	1-1/16	.831	4	1-1/2	1	.831
1.323	1.385	1-3/8		3	1.108	6-1/16	3	1-1/16	.831	4	1-1/2	1	.831
1.385	1.448	1-7/16	M36	3	1.233	6-1/16	3	1-1/8	.925	4	1-1/2	1	.925
1.448	1.510	1-1/2		3	1.233	6-3/8	3	1-1/8	.925	4	1-1/2	1	.925
1.510	1.635	1-5/8	M39	3	1.305	6-11/16	3-3/16	1-1/8	.979	5	2	1-1/8	.979
1.635	1.760	1-3/4	M42	3	1.430	7	3-3/16	1-1/4	1.072	5	2	1-1/4	1.072
1.760	1.885	1-7/8		3	1.519	7-5/16	3-9/16	1-1/4	1.139	5	2	1-1/4	1.139
1.885	2.010	2	M48	3	1.644	7-5/8	3-9/16	1-3/8	1.233	5	2	1-3/8	1.233
2.010	2.135	2-1/8		3	1.769	8	3-9/16	1-3/8	1.327	5-1/4	2	1-3/8	1.327
2.135	2.260	2-1/4	M56	3	1.894	8-1/4	3-9/16	1-7/16	1.420	5-1/4	2	1-7/16	1.420
2.260	2.385	2-3/8		3	2.019	8-1/2	4	1-716	1.514	5-1/4	2	1-7/16	1.514
2.385	2.510	2-1/2		3	2.100	8-3/4	4	1-1/2	1.575	5-1/4	2	1-1/2	1.575
2.510	2.635	2-5/8	M64	3	2.225	8-3/4	4	1-1/2	1.669	5-1/2	2	1-1/2	1.575
2.635	2.760	2-3/4		3	2.350	9-1/4	4	1-9/16	1.762	5-1/2	2	1-1/2	1.575
2.760	2.885	2-7/8	M72	3	2.475	9-1/4	4	1	1.856	5-1/2	2	1-1/2	1.575
2.885	3.010	3		3	2.543	9-3/4	4-9/16	1-5/8	1.907	5-1/2	2	1-1/2	1.575
3.010	3.135	3-1/8		3	2.668	9-3/4	4-9/16	1-5/8	2.001	5-3/4	2	1-1/2	1.575
3.135	3.260	3-1/4	M80	3	2.793	10	4-9/16	1-3/4	2.095	5-3/4	2	1-1/2	1.575
3.260	3.385	3-3/8		3	2.883	10	4-9/16	1-3/4	2.162	5-3/4	2	1-1/2	1.575
3.385	3.510	3-1/2		3	3.008	10-1/4	4-15/16	2	2.256	5-3/4	2	1-1/2	1.575
3.510	3.635	3-5/8	M90	3	3.133	10-1/4	4-15/16	2	2.350	6	2	1-3/4	1.575
3.635	3.760	3-3/4		3	3.217	10-1/2	5-5/16	2-1/8	2.413	6	2	1-3/4	1.575
3.760	3.885	3-7/8		3	3.342	10-1/2	5-5/16	2-1/8	2.506	6	2	1-3/4	1.575
3.885	4.010	4	M100	3	3.467	10-3/4	5-5/16	2-1/4	2.600	6	2	1-3/4	1.575