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Library › Hardware › Flat-head wood screws, inch #4–#14 (ASME B18.6.1): body and head…

#4 flat-head wood screw envelope

#4 flat-head wood screw envelope: head Ø5.71 mm (A max .225 in) tapering to the Ø2.845 mm nominal body over 1.70 mm (H ref .067 in); plain body, example overall length 1-1/2 in (38.1 mm, Xem's choice); no thread, slot, recess or point

Exact dimensions. True size, no tolerance added. Threads are plain cylinders at the major diameter.

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Dimensions

screw ##4
TPI22
nominal body dia (in).112
nominal body dia (mm, computed)2.84
body dia max / min (AFT, in).116 / .105
flat head dia A max / min (in).225 / .195
head height H ref (in).067
pilot softwood / hardwood (Albany, in)5/64 / 3/32
clearance (Albany, in)1/8
pilot softwood / hardwood (Fine Power Tools, in)3/64 / 5/64
clearance (Fine Power Tools, in)7/64
pilot hardwood / softwood (Engineers Edge, in)1/16 / 3/64
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From the full sheet

Flat-head wood screws, inch #4–#14 (ASME B18.6.1): body and head diameter, pilot and clearance holes from three sources + envelope models: every size, notes, mating features and sources. What drill size for a #8 wood screw pilot and clearance hole, and what are the body and head diameters?

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