Drilling Diameter for Stove Burner Castings

When we produced stove burner base, burner cap, pedestals and burner heads, we need to drill many small holes. On the drawings, you could find the size or number of drilling holes. The following size chart will be useful to get the drilling diameter by the size numbers.

SIZE (#)	SIZE (LETTER)	DIAMETER (INCH)	DIAMETER (MM)
# 80		0.0135	0.343
# 79		0.0145	0.368
# 78		0.016	0.406
# 77		0.018	0.457
# 76		0.02	0.508
# 75		0.021	0.533
# 74		0.0225	0.572
# 73		0.024	0.610
# 72		0.025	0.635
# 71		0.026	0.660
# 70		0.028	0.711
# 69		0.0292	0.742
# 68		0.031	0.787
# 67		0.032	0.813
# 66		0.033	0.838
# 65		0.035	0.889
# 64		0.036	0.914
# 63		0.037	0.940
# 62		0.038	0.965
# 61		0.039	0.991
# 60		0.04	1.016
# 59		0.041	1.041
# 58		0.042	1.067
# 57		0.043	1.092
# 56		0.0465	1.181
# 55		0.052	1.321
# 54		0.055	1.397
# 53		0.0595	1.511
# 52		0.0635	1.613
# 51		0.067	1.702
# 50		0.07	1.778
# 49		0.073	1.854
# 48		0.076	1.930
# 47		0.0785	1.994
# 46		0.081	2.057
# 45		0.082	2.083
# 44		0.086	2.184
# 43		0.089	2.261
# 42		0.0935	2.375
# 41		0.096	2.438
# 40		0.098	2.489
# 39		0.0995	2.527
# 38		0.1015	2.578
# 37		0.104	2.642
# 36		0.1065	2.705
# 35		0.11	2.794
# 34		0.111	2.819
# 33		0.113	2.870
# 32		0.116	2.946
# 31		0.12	3.048
# 30		0.1285	3.264
# 29		0.136	3.454
# 28		0.1405	3.569
# 27		0.144	3.658
# 26		0.147	3.734
# 25		0.1495	3.797
# 24		0.152	3.861
# 23		0.154	3.912
# 22		0.157	3.988
# 21		0.159	4.039
# 20		0.161	4.089
# 19		0.166	4.216
# 18		0.1695	4.305
# 17		0.173	4.394
# 16		0.177	4.496
# 15		0.18	4.572
# 14		0.182	4.623
# 13		0.185	4.699
# 12		0.189	4.801
# 11		0.191	4.851
# 10		0.1935	4.915
# 9		0.196	4.978
# 8		0.199	5.055
# 7		0.201	5.105
# 6		0.204	5.182
# 5		0.2055	5.220
# 4		0.209	5.309
# 3		0.213	5.410
# 2		0.221	5.613
# 1		0.228	5.791
	A	0.234	5.944
	B	0.238	6.045
	C	0.242	6.147
	D	0.246	6.248
	E	0.25	6.350
	F	0.257	6.528
	G	0.261	6.629
	H	0.266	6.756
	I	0.272	6.909
	J	0.277	7.036
	K	0.281	7.137
	L	0.29	7.366
	M	0.295	7.493
	N	0.302	7.671
	O	0.316	8.026
	P	0.323	8.204
	Q	0.332	8.433
	R	0.339	8.611
	S	0.348	8.839
	T	0.358	9.093
	U	0.368	9.347
	V	0.377	9.576
	W	0.386	9.804
	X	0.397	10.084
	Y	0.404	10.262
	Z	0.413	10.490