See Fastners for other head types (flat head, oval head, ...)

Guage Number	Shank Diam		Root Diam		Threads Per Inch
	Decimal	Fract *	Decimal	Fract *
0	0.060	1/16	0.040	3/64	32
1	0.073	5/64	0.046	3/64	28
2	0.086	3/32	0.054	1/16	26
3	0.099	7/64	0.065	1/16	24
4	0.112	7/64	0.075	5/64	22
5	0.125	1/8	0.085	5/64	20
6	0.138	9/64	0.094	3/32	18
7	0.151	5/32	0.102	7/64	16
8	0.164	11/64	0.112	7/64	15
9	0.177	3/16	0.122	1/8	14
10	0.190	3/16	0.130	1/8	13
11	0.203	13/64	0.139	9/64	12
12	0.216	7/32	0.148	9/64	11
14	0.242	1/4	0.165	5/32	10
16	0.268	17/64	0.184	3/16	9
18	0.294	19/64	0.204	13/64	8
20	0.320	5/16	0.233	7/32	8
22	0.346	11/32
24	0.372	3/8	0.260	1/4	7
26	0.398	13/32
28	0.424	27/64
30	0.450	29/64

* Nearest Fractional Equivalent (Next highest drill for pilot hole)
Most stores (Home Depot, ACE) only carry #4 - #14

Hardware stores with expanded selections.
Finkles, Lambertville, NJ
Emigh Hardware - Products, 916-482-1900, 3555 El Camino Ave., Sacramento, CA

Types of screws