Machinery's Handbook, 31st Edition
WOOD SCREWS 1935 ANSI Flat, Pan, and Oval Head Wood Screws ANSI/ASME B18.6.1-1981 (R2016)
O V
T
U
L T *
L T *
L T *
J
J
J
D
A
B
D
AD
P
H
H
L
L
L Oval Head
K
Flat Head
Pan Head
D
J
A
B
P
H
Head Diameter
Head Diameter
Head Radius
Height of Head
Width of Slot Max. Min. .023 .016 .026 .019 .031 .023 .035 .027 .039 .031 .043 .035 .048 .039 .048 .039 .054 .045 .054 .045 .060 .050 .067 .056 .075 .064 .075 .064 .084 .072 .084 .072 .094 .081
Nominal Size
Threads per inch
Basic Dia. of Screw
Max., Sharp Edge
Min., Edge Rounded or Flat
Max. Min. Max. .116 .104 .020 .142 .130 .025 .167 .155 .035 .193 .180 .037 .219 .205 .042 .245 .231 .044 .270 .256 .046 .296 .281 .049 .322 .306 .052 .348 .331 .056 .373 .357 .061 .425 .407 .078 .492 .473 .087 .528 .508 .094 .615 .594 .099 .631 .608 .121 .740 .716 .143
Ref. .035 .043 .051 .059 .067 .075 .083 .091 .100 .108 .116 .132 .153 .164 .191 .196 .230 Min. .025 .031 .037 .043 .049 .055 .060 .066 .072 .078 .084 .096 .112 .120 .141 .144
0 1 2 3 4 5 6 7 8 9
32 28 26 24 22 20 18 16 15 14 13 11 10
.060 .073 .086 .099 .112 .125 .138 .151 .164 .177 .190 .216 .242 .268 .294 .320 .372
.119 .146 .172 .199 .225 .252 .279 .305 .332 .358 .385 .438 .507 .544 .635 .650 .762
.099 .123 .147 .171 .195 .220 .244 .268 .292 .316 .340 .389 .452 .485 .568 .582 .685
10 12 14 16 18 20 24
9 8 8 7
O
K
T
U
V
Tot. Hgt. of Head Height of Head
Depth of Slot
Depth of Slot
Depth of Slot
Nominal Size
Threads per Inch
Max. .056 .068 .080 .092 .104 .116 .128 .140 .152 .164 .176 .200 .232 .248 .290 .296 .347
Min. .041 .052 .063 .073 .084 .095 .105 .116 .126 .137 .148 .169 .197 .212 .249 .254 .300
Max. .039 .046 .053 .060 .068 .075 .082 .089 .096 .103 .110 .125 .144 .153 .178 .182 .212
Min. .031 .038 .045 .051 .058 .065 .072 .079 .085 .092 .099 .112 .130 .139 .162 .166 .195
Max. .015 .019 .023 .027 .030 .034 .038 .041 .045 .049 .053 .060 .070 .075 .083 .090 .106
Min. .010 .012 .015 .017 .020 .022 .024 .027 .029 .032 .034 .039 .046 .049 .054 .059 .070
Max. .022 .027 .031 .035 .040 .045 .050 .054 .058 .063 .068 .077 .087 .093 .106 .108 .124
Min. .014 .018 .022 .027 .030 .034 .037 .041 .045 .049 .053 .061 .070 .074 .085 .087 .100
Max. .030 .038 .045 .052 .059 .067 .074 .081 .088 .095 .103 .117 .136 .146 .171 .175 .204
0 1 2 3 4 5 6 7 8 9
32 28 26 24 22 20 18 16 15 14 13 11 10
10 12 14 16 18 20 24
9 8 8 7
.168 All dimensions in inches. The edge of flat and oval head screws may be flat or rounded. Wood screws are also available with Types I, IA, and II recessed heads. Consult the standard for recessed head dimensions. *The length of the thread, L T , on wood screws having cut threads shall be equiva lent to approximately two-thirds of the nominal length of the screw. For rolled threads, L T shall be at least four times the basic screw diameter or two-thirds of the nominal screw length, whichever is greater. Screws of nominal lengths that are too short to accommodate the minimum thread length shall have threads extending as close to the underside of the head as practicable. Pilot Hole Drill Sizes for Wood Screws Work Material Wood Screw Size 2 4 6 8 10 12 14 Hardwood 3 ∕ 64 1 ∕ 16 5 ∕ 64 3 ∕ 32 7 ∕ 64 1 ∕ 8 9 ∕ 64 Softwood 1 ∕ 32 3 ∕ 64 1 ∕ 16 5 ∕ 64 3 ∕ 32 7 ∕ 64 1 ∕ 8
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