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„Here you will find the tables for the core hole diameters:“

Metric ISO thread DIN 13, T1

thread	core hole drill Æ	slope	hexagonal key width	through hole for screws		nut height
				fine	medium
M 1	0.75	0.25		1.1	1.2	0.8
M1.1	0.85	0.25		1.2	1.3	0.9
M1.2	0.95	0.25		1.3	1.4	1
M1.4	1.1	0.3		1.5	1.6	1.2
M1.6	1.3	0.35	3.2	1.7	1.8	1.3
M1.8	1.5	0.35	3.2	1.9	2	1.4
M2	1.6	0.4	4	2.2	2.4	1.6
M2.2	1.8	0.45	4.5	2.4	2.6	1.8
M2.5	2.1	0.45	5	2.7	2.9	2
M3	2.5	0.5	5.5	3.2	3.4	2.4
M3.5	2.9	0.6	6	3.7	3.9	2.8
M4	3.3	0.7	7	4.3	4.5	3.2
M5	4.2	0.8	8	5.3	5.5	4
M6	5.0	1.0	10	6.4	6.6	5
M8	6.8	1.25	13	8.4	9	6.5
M10	8.5	1.5	17	10.5	11	8
M12	10.2	1.75	19	13	14	9.5
M14	12	2	22	15	16	11
M16	14	2	24	17	18	13
M18	15.5	2.5	27	19	20	15
M20	17.5	2.5	30	21	22	16
M22	19.5	2.5	32	23	24	17
M24	21	3	36	25	26	18
M27	24	3	41	28	30	20
M30	26.5	3.5	46
M4	3.3	0.7	7	4.3	4.5	3.2
M5	4.2	0.8	8	5.3	5.5	4
M6	5.0	1.0	10	6.4	6.6	5
M8	6.8	1.25	13	8.4	9	6.5
M10	8.5	1.5	17	10.5	11	8
M12	10.2	1.75	19	13	14	9.5
M14	12	2	22	15	16	11
M16	14	2	24	17	18	13
M18	15.5	2.5	27	19	20	15
M20	17.5	2.5	30	21	22	16
M22	19.5	2.5	32	23	24	17
M24	21	3	36	25	26	18
M27	24	3	41	28	30	20
M30	26.5	3.5	46	31	33	22
M36	32	4	55	37	39	28
M42	37.5	4.5	65	43	45	32
M48	43	5	75	50	52	38
M56	50.5	5.5	85	38	62	44
M64	58	6	95	66	70	50

Specifications without guarantee!