Fillister Head Screw

This head has a smaller diameter head than the round head. The head is also taller, and it has a deeper slot. The smaller diameter head increases the pressure applied on a smaller area and allows for assembly closer to flanges and raised surfaces. This style is Preferred for use in counterbored holes.
This table references ANSI B18.6.3

Nominal
Size
A
H
O
J
T
M
G
N
Phillips
Driver
Size
Head
Diameter
Head Height
Slot Width
Slot Depth
Dimensions of Recess
Side Height
Total Height
Diameter
Depth
Width
Max
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
Min
0 .096 .083 .043 .038 .055 .047 .023 .016 .025 .015 .067 .054 .039 .013 0
2 .140 .124 .062 .053 .083 .066 .031 .023 .037 .025 .104 .091 .059 .017
3 .161 .145 .070 .061 .095 .077 .035 .027 .043 .030 .112 .099 .068 .019 1
4 .183 .166 .079 .069 .107 .088 .039 .031 .048 .035 .122 .109 .078 .019 1
5 .205 .187 .088 .078 .120 .100 .043 .035 .054 .040 .143 .130 .067 .027 2
6 .226 .208 .096 .086 .132 .111 .048 .039 .060 .045 .166 .153 .091 .028 2
8 .270 .250 .113 .102 .156 .133 .054 .045 .071 .054 .182 .169 .108 .030 2
10 .313 .292 .130 .118 .180 .156 .060 .050 .083 .064 .199 .186 .124 .031 2
12 .357 .334 .148 .134 .205 .178 .067 .056 .094 .074 .259 .246 .141 .034 3
1/4 .414 .389 .170 .155 .237 .207 .075 .064 .109 .087 .281 .268 .161 .036 3
5/16 .518 .490 .211 .194 .295 .262 .084 .072 .137 .110 .322 .309 .203 .042 3
3/8 .622 .590 .253 .233 .355 .315 .094 .081 .164 .133 .389 .376 .233 .065 4

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