ANSI Flat Head Screw Size Chart

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A flat head screw , or bolt , is a type of fastener characterized by a drive head that is flat or horizontal and includes a slot or phillips drive feature.

100 Degree Head
All units in Inches

100 Degree Head

BASIC
DIA
A
Head Diameter
J
Slot Width
T
Slot Depth
NO.0000 0.043 0.008 0.008
NO.000 0.064 0.012 0.011
NO.00 0.093 0.017 0.013
NO.0 0.119 0.023 0.013
NO.1 0.146 0.026 0.016
NO.2 0.172 0.031 0.019
NO.3 0.199 0.035 0.022
NO.4 0.225 0.039 0.024
NO.6 0.279 0.048 0.030
NO.8 0.332 0.054 0.036
NO.10 0.385 0.060 0.042
.25 0.507 0.075 0.055
.3125 0.635 0.084 0.069
.375 0.762 0.094 0.083

81 Degree Head

81 Degree Head

 
BASIC
DIA
A
Head Diameter
J
Slot Width
T
Slot Depth
NO.0000 0.043 0.008 0.007
NO.000 0.064 0.011 0.009
NO.00 0.093 0.017 0.014
NO.0 0.119 0.023 0.015
NO.1 0.146 0.026 0.019
NO.2 0.172 0.031 0.023
NO.3 0.199 0.035 0.027
NO.4 0.225 0.039 0.030
NO.5 0.252 0.043 0.034
NO.6 0.279 0.048 0.038
NO.8 0.332 0.054 0.045
NO.10 0.385 0.060 0.053
NO.12 0.438 0.067 0.060
.25 0.507 0.075 0.070
.3125 0.635 0.084 0.088
.375 0.762 0.094 0.106
.4375 0.812 0.094 0.103
.5 0.875 0.106 0.103
.5625 1.000 0.118 0.120
.625 1.125 0.133 0.137
.75 1.375 0.149 0.171