FLOORBOARD SCREWS
FLAT HEAD PHILLIPS 
All Dimensions in Inches
Basic 
Screw 
Diameter
Head Diameter Head Height Dimensions of Recess Phillips
 Driver 
Size
Diameter Depth Width
Max. Min. Max. Min. Max. Min. Max. Min.
2/56 .172 .150 .051 .040 .102 .089 .063 .017 1
4/40 .225 .200 .067 .055 .128 .115 .086 .018 1
6/32 .279 .249 .083 .069 .174 .161 .106 .029 2
8/32 .332 .300 .100 .084 .189 .176 .121 .031 2
10/32 .385 .348 .116 .098 .204 .191 .136 .032 2
10/24 .385 .348 .116 .098 .204 .191 .136 .032 2
12/24 .438 .397 .132 .112 .268 .255 .156 .036 3
1/4-20 .507 .462 .153 .131 .283 .270 .171 .035 3
5/16-18 .635 .581 .191 .165 .365 .352 .216 .061 4
3/8-16 .762 .700 .230 .200 .393 .380 .246 .065 4