Appendix E: Drill and Screw Dimensions

Table E-1: English Sizes
Screw size No. or Diam.	Threads per inch	Clearance hole (drill diameter)	Head diam. Typ. (in.)	Washer diam. typ. (in.)	Nut size (in.)
Close fit	Normal fit	Loose fit
Drill bit gauge	Min. (in.)	Drill bit gauge	Med. (in.)	Drill bit gauge	Max. (in.)
0	80	No. 51	0.067	No. 48	0.079	3/32	0.104	0.116	0.188	5/32
1	72 or 64	No. 46	0.081	No. 43	0.092	No. 37	0.114	0.141	0.219	5/32
2	64 or 56	3/32	0.094	No. 38	0.105	No. 32	0.126	0.167	0.250	3/16
3	56 or 48	No. 36	0.106	No. 32	0.119	No. 30	0.140	0.193	0.312	3/16
4	48 or 40	No. 31	0.120	No. 30	0.130	No. 27	0.156	0.219	0.375	1/4
5	44 or 40	9/64	0.141	5/32	0.160	11/64	0.184	0.245	0.406	1/4
6	40 or 32	No. 23	0.154	No. 18	0.174	No. 13	0.197	0.270	0.438	5/16
8	36 or 32	No. 15	0.180	No. 9	0.200	No. 3

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