American Wood Screw Size Chart and Diameters

Wood Screw DiametersWood screws are sharp-pointed screws for nonstructural, wood-to-wood fastening. Wood screws have coarse threads and an unthreaded shank near the head, which allows the screw to pull the wood pieces tightly together.

Here we will check This chart lists the actual dimensions of wood screws and the closest fractional size equivalents. Let’s have a look wood screw size chart.

Wood Screw Diameters

Size Major Thread Diameter*
Decimal Nearest Fractional Measurement
#0 .060″ 1/16″
#1 .073″ 5/64″
#2 .086″ 3/32″
#3 .099″ 7/64″
#4 .112″ 7/64″
#5 .125″ 1/8″
#6 .138″ 9/64″
#7 .151″ 5/32″
#8 .164″ 5/32″
#9 .177″ 11/64″
#10 .190″ 3/16″
#11 .203″ 13/64″
#12 .216″ 7/32″
#14 .242″ 1/4″
#16 .268″ 17/64″
#18 .294″ 19/64″
#20 .320″ 5/16″

Wood Screws: Slotted & Phillips Flat Head Dimensions

Wood Screws Flat Head Dimensions

Nominal Size Phillips Driver Size Head Diameter (A) Head Height (H) Width of Slot (J) Depth of Slot (T) Dimension of Recess
Max Min Ref Max Min Max Min Dia. Max (M) Dia. Min (M) Depth Max (G) Depth Min (G) Width Min (N)
2 1 .172 .147 .051 .031 .023 .023 .015 .102 .089 .063 .047 .017
3 1 .199 .141 .059 .035 .027 .027 .017 .107 .094 .068 .052 .018
4 1 .225 .195 .067 .039 .031 .030 .020 .128 .115 .089 .073 .018
5 2 .252 .220 .075 .043 .035 .034 .022 .154 .141 .086 .063 .027
6 2 .279 .244 .083 .048 .039 .038 .024 .174 .161 .106 .083 .029
7 2 .305 .268 .091 .048 .039 .041 .027 .189 .176 .121 .098 .030
8 2 .332 .292 .100 .054 .045 .045 .029 .204 .191 .136 .113 .032
9 2 .358 .316 .108 .054 .045 .049 .032 .214 .201 .146 .123 .033
10 3 .385 .340 .116 .060 .050 .053 .034 .258 .245 .146 .123 .034
12 3 .438 .389 .132 .067 .056 .060 .039 .283 .270 .171 .148 .036
14 3 .507 .452 .153 .075 .064 .070 .046 .283 .270 .171 .148 .036
16 3 .544 .485 .164 .075 .064 .075 .049 .303 .290 .191 .168 .039

Wood Screws: Round Head Dimensions

Wood Screws: Round Head Dimensions
Nominal Size Phillips Driver Size Head Diameter (A) Head Height (H) Width of Slot (J) Depth of Slot (T) Dimension of Recess
Max Min Max Min Max Min Max Min Dia. Max (M) Dia. Min (M) Depth Max (G) Depth Min (G) Width Min (N)
2 1 .162 .146 .069 .059 .031 .023 .048 .037 .114 .101 .064 .042 .018
4 2 .211 .193 .086 .075 .039 .031 .058 .044 .130 .117 .083 .063 .019
5 2 .236 .217 .095 .083 .043 .035 .063 .047 .154 .141 .074 .046 .027
6 2 .260 .240 .103 .091 .048 .039 .068 .051 .162 .149 .084 .056 .027
7 2 .285 .264 .111 .099 .048 .039 .072 .055 .170 .157 .092 .066 .028
8 2 .309 .287 .120 .107 .054 .045 .077 .058 .178 .165 .101 .075 .030
9 2 .334 .311 .128 .115 .054 .045 .082 .062 .186 .173 .110 .084 .030
10 2 .359 .334 .137 .123 .060 .050 .087 .065 .195 .182 .119 .093 .031
12 3 .408 .382 .153 .139 .067 .056 .096 .073 .249 .236 .125 .099 .032
14n 3 .457 .429 .170 .155 .075 .064 .106 .080 .265 .252 .142 .116 .034

Wood Screws Oval Head Dimensions

Wood Screws Oval Head Dimensions
Nominal Size Phillips Driver Size Head Diameter (A) Head Height (H) Width of Slot (J) Depth of Slot (T) Dimension of Recess
Max Min Side Height (Ref.) Total Height Max Total Height Min Max Min Max Min Dia. Max (M) Dia. Min (M) Depth Max (G) Depth Min (G) Width Min (N)
4 1 .225 .195 .067 .104 .084 .039 .031 .059 .049 .136 .123 .094 .077 .019
5 2 .252 .220 .075 .116 .095 .043 .035 .067 .055 .158 .145 .085 .061 .028
6 2 .279 .244 .083 .128 .105 .048 .039 .074 .060 .178 .165 .105 .080 .030
8 2 .332 .292 .100 .152 .126 .054 .045 .088 .072 .205 .192 .131 .106 .033
9 2 .358 .316 .108 .164 .137 .054 .045 .095 .078 .216 .203 .144 .119 .034
10 3 .385 .340 .116 .176 .148 .060 .050 .103 .084 .261 .248 .142 .118 .037
12 3 .438 .389 .132 .200 .169 .067 .056 .117 .096 .283 .270 .165 .140 .040

Wood Screws Thread & Body Diameter

Wood Screws: Thread & Body Diameter

Nominal Size
Basic Screw Diameter
Threads Per Inch Major Thread Diameter (D) Body Diameter – (E) Cut Thread Body Diameter – (E) Rolled Thread Thread Depth (F)
Max Min Max Min Max Min Min
2 .086 26 .090 .079 .090 .079 .075 .064 .010
3 .099 24 .103 .092 .103 .092 .086 .075 .014
4 .112 22 .116 .105 .116 .105 .095 .084 .016
5 .125 20 .129 .118 .129 .118 .107 .096 .018
6 .138 18 .142 .131 .142 .131 .118 .107 .020
7 .151 16 .155 .144 .155 .144 .127 .116 .022
8 .164 15 .168 .157 .168 .157 .136 .125 .023
9 .177 14 .181 .170 .181 .170 .147 .136 .026
10 .190 13 .194 .183 .194 .183 .157 .146 .030
12 .216 11 .220 .209 .220 .209 .176 .165 .031
14 .242 10 .246 .235 .246 .235 .201 .190 .035
16 .268 9 .272 .261 .272 .261 .214 .203 .038

Important FAQ’s of Wood Screw

Q: What size pilot hole for #8 wood screw

Ans: Pilot hole for hard wood  11/64″ and pilot hole for soft wood 7/64″

Q: What size drill bit for #10 wood screw?

Ans: Pilot hole for hard wood 13/64″ and pilot hole for soft wood 3/16″

Q: What size pilot hole for #6 wood screw

Ans: Pilot hole for hard wood 3/32″ and pilot hole for soft wood 5/64″

Q: What size pilot hole for #10 wood screw

Ans: Pilot hole for hard wood 13/64″ and pilot hole for soft wood 1/8″

Q: What size drill bit for 12 wood screw

Ans: Pilot hole for hard wood 9/64″ and pilot hole for soft wood 1/8

Q: What size pilot hole for 6 wood screw

Ans: Pilot hole for hard wood 9/64″ and pilot hole for soft wood 7/64″

Q: What size pilot hole for #14 wood screw

Ans: Pilot hole for hard wood 1/4″ and pilot hole for soft wood 5/32″

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