TAP CHART
UNIFIED INCH STANDARD			METRIC STANDARD
TAP SIZE	CUTTING TAP DRILL	FORMING TAP DRILL	TAP SIZE	CUTTING TAP DRILL	FORMING TAP DRILL
0-80	3/64	54	M1.6x0.35	1.25mm	1.45mm
1-64	53	1.65mm	M1.8x0.35	1.45mm	1/16
1-72	53	1.7mm	M2x0.4	1.6mm	49
2-56	50	5/64	M2.2x0.45	1.75mm	42
2-64	50	2mm	M2.5x0.45	2.05mm	42
3-48	47	43	M3x0.5	2.5mm	34
3-56	46	2.3mm	M3.5x0.6	2.9mm	3.3mm
4-40	43	39	M4x0.7	3.3mm	3.7mm
4-48	42	2.6mm	M4.5x0.75	3.75mm (26)	4.2mm (19)
5-40	39	33	M5x0.8	4.2mm (19)	13
5-44	38	2.9mm	M6x1	5mm (9)	2
6-32	36	1/8	M7x1	6mm	6.5mm
6-40	33	3.2mm	M8x1.25	H	M
8-32	29	25	M8x1	7mm (J)	19/64
8-36	29	24	M10x1.5	8.5mm	U
10-24	25	11/64	M10x1.25	11/32	9.5mm
10-32	21	16	M12x1.75	13/32	7/16
12-24	17	9	M12x1.25	27/64	11.5mm
12-28	15	8	M14x2	12mm	33/64
1/4-20	7	1	M14x1.5	12.5mm	17/32
1/4-28	3	A	M16x2	14mm	19/32
5/16-18	F	7.3mm	M16x1.5	14.5mm	39/64
5/16-24	I	M	M18x2.5	15.5mm	17
3/8-16	5/16	S	M18x1.5	16.5mm	11/16
3/8-24	Q	T	M20x2.5	17.5mm	19mm
7/16-14	U	13/32	M20x1.5	18.5mm	46/64
7/16-20	W	10.5mm	M22x2.5	19.5mm	21mm
1/2-13	27/64	11.8mm	M22x1.5	20.5mm	27/32
1/2-20	29/64	12mm	M24x3	21mm	*
9/16-12	31/64	17/32	M24x2	22mm	*
9/16-18	33/64	13.5mm	M27x3	24mm	*
5/8-11	17/32	*	M27x2	25mm	*
5/8-18	37/64	*	M30x3.5	26.5mm	*
3/4-10	21/32	*	M30x2	28mm	*
3/4-16	11/16	*	M33x3.5	29.5mm	*
7/8-9	49/64	*	M33x2	31mm	*
7/8-14	13/16	*	M36x4	32mm	*
1-8	7/8	*	M36x3	33mm	*
1-12	59/64	*
1-14	15/16	*