Wood Screw Dimensions

For sizes 0-24: Head - Shank - Root - TPI

This page gives the basic physical dimensions of wood screws from #0 to #24. There is also a page on Wood Screw Pilot Hole Sizes that also lists the key dimensions as well as the various recommendations made for pilot hole sizes including ones that work for fine work as well as those that work for construction.

No. Of Screw	Head Diameter		Shank Diameter			Root Diameter			Threads Per Inch	No. Of Screw
No. Of Screw	Min	Max	Basic Dec. Size	Nearest Fractional Equivalent		Average Dec. Size	Nearest Fractional Equivalent		Threads Per Inch	No. Of Screw
0	.105	.119	.060	1/16	+.002	.040	3/64	+.007	32	0
1	.130	.146	.073	5/64	+.005	.046	3/64		28	1
2	.156	.172	.086	3/32	+.007	.054	1/16	+.008	26	2
3	.181	.199	.099	7/64	- .010	.065	1/16	- .002	24	3
4	.207	.225	.112	7/64	- .003	.075	5/64	+.003	22	4
5	.232	.252	.125	1/8		.085	5/64	- .007	20	5
6	.257	.279	.138	9/64	+.002	.094	3/32		18	6
7	.283	.305	.151	5/32	+.005	.102	7/64	+.007	16	7
8	.308	.332	.164	5/32	- .007	.112	7/64	- .003	15	8
9	.334	.358	.177	11/64	- .005	.122	1/8	+.003	14	9
10	.359	.385	.190	3/16	- .002	.130	1/8	- .005	13	10
11	.385	.411	.203	13/64		.139	9/64	+.001	12	11
12	.410	.438	.216	7/32	+.003	.148	9/64	- .007	11	12
14	.461	.491	.242	1/4	+.008	.165	5/32	- .009	10	14
16	.512	.544	.268	17/64	- .002	.184	3/16	+.003	9	16
18	.563	.597	.294	19/64	+.003	.204	13/64	- .001	8	18
20	.614	.650	.320	5/16	- .007	.223	7/32	- .004	8	20
24	.716	.756	.372	3/8	+.003	.260	1/4	- .010	7	24

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