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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.

American Wood Screws Up to 2 Inches Long
G
A
U
G
E
Length in inches Driver tip
¼ ½ ¾ 1 2 Min. slot
width
Slotted
tip
Phillips
bit
0 FR FR                   0.016 332 0
1 FR FR FR                 0.019 316 0
2 FR FR FR FR FR             0.023 316 1
3 FR FRO FR FR FR FR FR FR       0.027 316 1
4 FR FRO FRO FRO FRO FR FR FR FR     0.031 316 1
5   FR FRO FRO FRO FR FRO FR FR     0.035 316 2
6   FR FRO FRO FRO FR FRO FRO FRO FRO FR 0.039 316 2
7   FR FRO FRO FRO FRO FRO FRO FRO FRO FR 0.039 316 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 0.050 516 2 or 3*
11       FR FR FR FRO FRO FRO FRO FRO 0.056 38 3
12       FR FR FRO FRO FRO FRO FRO FRO 0.056 38 3
14           FR FRO FRO FRO FRO FRO 0.064 38 3
16             FR FR FRO FRO FRO 0.064 38 3
18               F FRO FRO FRO 0.072 38 4
20                 FRO FRO FRO 0.072 38 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
2 3 4 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       0.050 516 2 or 3*
11 FRO FR F F F         0.056 38 3
12 FRO FRO FRO FR FR FR FR     0.056 38 3
14 FRO FRO FRO FR FR FR FR F F 0.064 38 3
16 FRO FR FR F FR FR FR F F 0.064 38 3
18 FRO F FR F FR F F F F 0.072 38 4
20 FRO F FR F F F F F F 0.072 38 4
24         F F F F F 0.081 38 4

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

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