Related Resources: hardware
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 green boxes indicate commonly available sizes and the red boxes sizes that, while made, are hard to find.
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Letters within the cells indicate which head styles are made in that gage and length:
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F for flat head,
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O for oval head,
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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. *Some head styles in this size take a #2 Phillips bit and others a #3.
Guage | Length in inches | Driver Tip | ||||||||||||
? | ? | ? | 1 | 1 | 1 | 1 | 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 | 2 | ||
9 | FR | FR | FRO | FRO | FRO | FRO | FRO | FRO | FR | 0.045 | 2 | |||
10 | FR | FR | FRO | FRO | FRO | FRO | FRO | FRO | FRO | 0.05 | 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 | ||||||||
American Wood Screws Over 2 Inches Long | ||||||||||||||
Guage | Length in inches | Driver Tip | ||||||||||||
? | ? | ? | 1 | 1 | 1 | 1 | 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 | 2 | ||||||||
9 | FR | FR | FR | FR | FR | 0.045 | 1/4 | 2 | ||||||
10 | FRO | FR | FR | FR | FR | FR | 0.05 | 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 |
Point Angle and Chisel Head Angle | ||
Material | Point angle | Chisel angle |
aluminum | 118130 | 125130 |
brass | 118125 | 125135 |
bronze (hard) | 118 | 115125 |
copper | 100130 | 125135 |
plastic | 60118 | 125135 |
stainless steel | 118140 | 115125 |
cast iron | 90118 | 115125 |
cast steel | 118 | 125235 |
Drill size | Lip relief | |
#80#61 | 24 | |
#60#41 | 21 | |
#40#31 | 18 | |
#30? | 16 | |
F11/32? | 14 | |
S? | 12 | |
33/64?? | 10 | |
49/64? up | 8 |