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Screw Sizes and Applications

Driver Bit Color Codes
Screw SizeDriver SizeHand Driver Color (normally)
#4 #0 Bit Light Yellow
#5, 6, 7 #1 Bit Medium Green
#8, 9, 10 #2 Bit Red
#12, 14 #3 Bit Black
#5/16" & up #4 Bit Un–coded;

Not sure which size you need? The drawings below are as accurate as possible to help in deciding which size is required for your job. In addition, the following guidelines may help you select the proper size:

#4 Designed for small crafts, jewelry boxes, attaching hinges, etc. Very lightduty. Available in 3/8" to 3/4" lengths.

#6 Small crafts, hinges and drawer slides, children’s furniture, toys, light-duty jigs and fixtures, etc. Light-duty. Available in 1/2" to 1-1/2" lengths.

#8 General furniture construction, cabinets, light construction. Good all-purpose. From 5/8" to 3" lengths.

#10 General construction, heavy-duty furniture, outdoor projects, decks, lawn furniture, boat building, etc. Available in 3/4" to 4" lengths.

#12 & #14 For heavy-duty construction, hanging solid-core doors, etc. Available in 3/4" to 6" lengths in selected styles. (#12 shown).

Screw Technical Details

 

SCREW DIMENSIONS.

We've listed screw dimensions in two forms − a table showing the maximum and minimum decimal dimensions, and a table showing the maximum fractional dimensions. Note that the fractional dimensions are the best approximations of the actual decimal dimensions.

 "A"
Flat Head
"A"
Pan Head
"A"
Round Washer Head
"B"
Body Dia
"C"
Thread Dia
SizeMaxMinMaxMinT maxMaxMinT maxMaxMinMaxMin
4 0.225 0.195 0.219 0.205 0.086 N/A N/A N/A 0.095 0.084 0.116 0.105
6 0.279 0.244 0.270 0.256 0.103 N/A N/A N/A 0.118 0.107 0.142 0.131
8 0.332 0.292 0.322 0.306 0.120 0.376 0.352 0.110 0.136 0.125 0.168 0.157
10 0.385 0.340 0.373 0.357 0.137 0.443 0.411 0.125 0.157 0.146 0.194 0.183
12 0.438 0.389 0.425 0.407 0.153 N/A N/A N/A 0.176 0.165 0.220 0.209
14 0.507 0.452 0.492 0.473 0.175 N/A N/A N/A 0.201 0.190 0.246 0.235
Note: IFI Standards specify a tolerance on screw length of +0", −1/16".
 "A"
Flat Head
"A"
Pan Head
"A"
Round Washer Head
"B"
Body Dia
"C"
Thread Dia
SizeMax DiaMax DiaT maxMax DiaT maxMinMax
4 7/32 7/32 3/32 N/A N/A 3/32 1/8
6 9/32 17/64 7/64 N/A N/A 1/8 9/64
8 21/64 21/64 1/8 3/8 7/64 9/64 11/64
10 25/64 3/8 9/64 7/16 1/8 5/32 3/16
12 7/16 27/64 5/32 N/A N/A 11/64 7/32
14 1/2 31/64 11/64 N/A N/A 13/64 1/4