Driver Bit Color Codes | ||
---|---|---|
Screw Size | Driver Size | Hand 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 in. & up | #4 Bit | Un–coded; |
Shop our selection of "Square Drive Driver Bits" and use the filters on the left to find the color bits you are looking for. |
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 light duty. Available in 3/8 in. to 3/4 in. lengths.
#6 Small crafts, hinges and drawer slides, children’s furniture, toys, light-duty jigs and fixtures, etc. light duty. Available in 1/2 in. to 1-1/2 in. 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 in. to 4 in. lengths.
#12 & #14 For heavy-duty construction, hanging solid-core doors, etc. Available in 3/4 in.to 6 in. lengths in selected styles. (#12 shown).
Use our Select A Screw Section and by using the filters on the left side you can quickly narrow your options to the screws you are looking for.
There is no hard and fast rule concerning screw length requirements. Sometimes you do not have much choice as to length because of the construction details. In general, though, the screw should always go through the thinner piece, and thread into the thicker piece. In choosing length, try to have about 2/3 of the screw threaded into the "secondary" piece, as shown. As the thickness of the lumber increases though, this ratio can be reduced so that only 1/2 of the shank is threaded into the secondary piece. Not coincidentally, only 2/3 of the shank is threaded on our 1 in. and longer screws.
We've listed screw dimensions for Production Screws 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 |
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Size | Max | Min | Max | Min | T max | Max | Min | T max | Max | Min | Max | Min |
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 |
||||||||
Size | Max Dia | Max Dia | T max | Max Dia | T max | Min | Max | |||||
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 |
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