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ITEM#

Insert Bit Sizing by Head Type

Phillips
Philllips
Point #
Sheet Metal Screws Wood Screws Machine Screws
Flat, Round, Oval Stove Binding Flat,
Oval
Round Flat, Oval Binding Round, Fillister Truss,
Brazier Button
0 0, 1 0, 1 0, 1 0, 1 0, 1 0, 1
1 2, 3, 4 2, 3, 4 2, 3, 4 2, 3, 4 2, 3, 4 2, 3, 4, 5
2 5, 6, 7, 8, 10 5, 6, 7, 8, 9 5, 6, 7, 8, 9, 10 5, 6, 8, 10 5, 6, 8, 10 6, 8, 10
3 12, 14 10, 12, 14, 16 12, 14, 16 12, 1/4" 12, 1/4", 5/16" 12, 1/4"
Slotted
Slotted
Point #
Screw
Size
Slot Screw Width Thread
Dia.
Maximum Head Diameter
Min Max Flat or
Oval
Head
Round
Head
Fillister
Head
Binding
Head
Pan
Head

Truss

Head

4-5 3 .027 .035 .099 .199 .187 .161 .208 .193 .226
4-5 4 .031 .039 .112 .225 .211 .183 .235 .219 .257
6-8 5 .035 .043 .125 .252 .236 .205 .263 .245 .289
8-10 6 .039 .048 .138 .279 .260 .226 .290 .270 .321
10-12 8 .045 .054 .164 .332 .309 .270 .344 .322 .384
Square
Slotted
Point #
Tapping Crews Wood Screws Machine Screws
0 3, 4 3, 4 3, 4
1 5, 6, 7 5, 6, 7 5, 6
2 8, 10 8, 9, 10 8, 10
3 12, 14 12, 14 12, 14
6-Lobe / Star / Torx®
Screw
Size
Thread
Dia.
Internal
Torx
Washer
Head
Pan
Head
Flat
Head
Hex
Head
Truss
Head
Fillister
Head
Oval
Head
Socket
Head
Cap
Socket Set Screw
2 .086 T7 T7 T6 ---- ---- ---- ---- ---- ----
3 .099 T8 T8 T7 ---- ---- ---- ---- ---- ----
4 .112 T9 T9 T8 T9 ---- T9 ---- T10 T6
5 .125 T10 T10 T9 T10 ---- T10 T10 T10 T7
6 .138 T15 T15 T10 T15 T10 T15 T15 T15 T7
8 .164 T20 T20 T15 T20 T15 T20 T20 T25 T8
10 .190 T25 T25 T20 T25 T20 T25 T25 T27 T10
12 .216 T27 T27 T25 T27 T25 T27 T27 T27 T10
1/4" .250 T30 T30 T27 T30 T27 T30 T30 T30 T20
5/16" .312 ---- ---- T40 T40 T40 T340 T40 T45 T27
3/8" .375 ---- T45 T40 T45 T45 T45 T45 T50 T30
7/16" .437 ---- T50 T50 ---- T45 T50 T50 T55 T40
1/2" .500 ---- T55 T50 ---- T50 T55 T50 T55 T45