Dimension of DIN6915 Structural Hex Nuts:

The DIN 6914 standard specifies high-strength structural bolts with large hexagon head for steel structures. The dimensions of DIN 6914 hex bolts vary depending on the specific size and type.

Thread size d		M12	M16	M20	M22	M24	M27	M30	M36
Pitch		1,75	2	2,5	2,5	3	3	3,5	4
dw	Min.	20	25	30	34	39	43,5	47,5	57
e	Min.	23,91	29,56	35,03	39,55	45,2	50,85	55,37	66,44
m	Nominal size = max.	10	13	16	18	19	22	24	29
Min.	9,64	12,3	14,9	16,9	17,7	20,7	22,7	27,7	12.1
m´	Min.	7,71	9,84	11,92	13,52	14,16	16,56	18,16	22,16
s	Nominal size = max.	22	27	32	36	41	46	50	60
Min.	21,16	26,16	31	35	40	45	49	58,8	21.45

Referring to the official DIN 6915 standard documentation.