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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 green boxes indicate commonly available sizes and the red boxes 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. *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  

 

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