AmishSoft.com

Wood Screw Size Chart

Screw No.	Shank Diameter¹		Root Diameter²			Maximum Head Diameter	Threads Per Inch
Screw No.	Nearest Fractional Measurement	Decimal Measurement	Nearest Fractional Measurement		Decimal Measurement	Maximum Head Diameter	Threads Per Inch
0	1/16	.060	3/64		.040	.119	32
1	5/64	.073	3/64		.046	.146	28
2	3/32	.086	1/16		.054	.172	26
3	7/64	.099	1/16		.065	.199	24
4	7/64	.112	5/64		.075	.225	22
5	1/8	.125	5/64		.085	.252	20
6	9/64	.138	3/32		.092	.279	18
7	5/32	.151	7/64		.102	.305	16
8	5/32	.164	7/64		.112	.332	15
9	11/64	.177	1/8		.122	.358	14
10	3/16	.190	1/8		.130	.385	13
11	13/64	..203	9/64		.139	.411	12
12	7/32	.216	9/64		.148	.438	11
14	1/4	.242	5/32		.165	.491	10
16	17/64	.268	3/16		.184	.544	9
18	19/64	.294	13/64		.204	.597	8
20	5/16	.320	7/32		.223	.650	8

¹ Shank diameter is measured on the smooth portion of the screw above the threads				² Root diameter is measured between the threads and does not include the thread height