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American wood screws

This page contains two tables, the first for wood screws two inches or less in length, and the second for screws two inches or more in length.

The blue letters indicate commonly available sizes and the red letters sizes that, while made, are hard to find.
Letters within the cells indicate which head styles are made in that gage and length:
   “F” for flat head,
   “O” for oval head,
   “R” for round head.
The last two columns indicate the matching screwdriver size. The Phillips sizes are exact. For slotted screws the width of the tip is given. Because a given tip width is often made in several thicknesses, these are only a rough guide.
All dimensions are in inches.

American Wood Screws Up to 2 Inches Long
G A U G E	Length in inches											Driver tip
G A U G E	¼	⅜	½	⅝	¾	⅞	1	1¼	1½	1¾	2	Min. slot width	Slotted tip	Phillips bit
0	FR	FR										0.016	³⁄₃₂	0
1	FR	FR	FR									0.019	³⁄₁₆	0
2	FR	FR	FR	FR	FR							0.023	³⁄₁₆	1
3	FR	FRO	FR	FR	FR	FR	FR	FR				0.027	³⁄₁₆	1
4	FR	FRO	FRO	FRO	FRO	FR	FR	FR	FR			0.031	³⁄₁₆	1
5		FR	FRO	FRO	FRO	FR	FRO	FR	FR			0.035	³⁄₁₆	2
6		FR	FRO	FRO	FRO	FR	FRO	FRO	FRO	FRO	FR	0.039	³⁄₁₆	2
7		FR	FRO	FRO	FRO	FRO	FRO	FRO	FRO	FRO	FR	0.039	³⁄₁₆	2
8		FR	FRO	FRO	FRO	FRO	FRO	FRO	FRO	FRO	FR	0.045	¼	2
9			FR	FR	FRO	FRO	FRO	FRO	FRO	FRO	FR	0.045	¼	2
10			FR	FR	FRO	FRO	FRO	FRO	FRO	FRO	FRO	0.050	⁵⁄₁₆	2 or 3*
11				FR	FR	FR	FRO	FRO	FRO	FRO	FRO	0.056	³⁄₈	3
12				FR	FR	FRO	FRO	FRO	FRO	FRO	FRO	0.056	³⁄₈	3
14						FR	FRO	FRO	FRO	FRO	FRO	0.064	³⁄₈	3
16							FR	FR	FRO	FRO	FRO	0.064	³⁄₈	3
18								F	FRO	FRO	FRO	0.072	³⁄₈	4
20									FRO	FRO	FRO	0.072	³⁄₈	4

*Some head styles in this size take a #2 Phillips bit and others a #3.

American Wood Screws 2 Inches in Length and Above
G A U G E	Length in inches									Driver tip
G A U G E	2	2¼	2½	2¾	3	3½	4	4½	5	Min. slot width	Slotted tip	Phillips bit
6	FR	FR	FR							0.039	3/16	2
7	FR	FR	FR							0.039	3/16	2
8	FR	FR	FR	FR						0.045	¼	2
9	FR	FR	FR	FR	FR					0.045	1/4	2
10	FRO	FR	FR	FR	FR	FR				0.050	⁵⁄₁₆	2 or 3*
11	FRO	FR	F	F	F					0.056	³⁄₈	3
12	FRO	FRO	FRO	FR	FR	FR	FR			0.056	³⁄₈	3
14	FRO	FRO	FRO	FR	FR	FR	FR	F	F	0.064	³⁄₈	3
16	FRO	FR	FR	F	FR	FR	FR	F	F	0.064	³⁄₈	3
18	FRO	F	FR	F	FR	F	F	F	F	0.072	³⁄₈	4
20	FRO	F	FR	F	F	F	F	F	F	0.072	³⁄₈	4
24					F	F	F	F	F	0.081	³⁄₈	4

*Some head styles in this size take a #2 Phillips bit and others a #3.

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Last revised: 15 September 2007.