These values are recommendations,
functionality has precedence.
Screw
Size
Decimal
Diameter
Close Fit
Normal Fit
Loose Fit
#0000
.021"
.024"
.026"
.028"
#000
.034"
.037"
.041"
.043"
#00
.047"
.052"
.055"
.0595"
#0
.060"
.0635"
.070"
.073"
#1
.073"
.076"
.081"
.089"
#2
.086"
.089"
.096"
.1065"
#3
.099"
.104"
.110"
.120"
#4
.112"
.116"
.1285"
.136"
#5
.125"
.1285"
.136"
.154"
#6
.138"
.144"
.1495"
.1695"
#8
.164"
.1695
.177
.1935
#10
.190"
.196"
.201"
.221"
#12
.216"
.221"
.228"
.246"
1/4"
.250"
.257"
.266"
.2812"
5/16"
.3125"
.323"
.332"
.3437"
3/8"
.375"
.386"
.397"
.4062"
7/16"
.4375"
.4531"
.4687"
.4844"
1/2"
.500"
.5156"
.5312"
.5469"
9/16"
.5625"
.5781"
.5937"
.6094"
5/8"
.625"
.6406"
.6562"
.6719"
3/4"
.750"
.7656"
.7812"
.7969"
7/8"
.875"
.8906"
.9062"
.9219"
1"
1.000"
1.0156"
1.0312"
1.0469"
1-1/8"
1.125"
1.1406"
1.1562"
1.1719"
1-1/4"
1.250"
1.2656"
1.2812"
1.2969"
1-3/8"
1.375"
1.3906"
1.4062"
1.4219"
1-1/2"
1.500"
1.5156"
1.5312"
1.5469"
1-3/4"
1.750"
1.7656"
1.7812"
1.7969"
2"
2.000"
2.0156"
2.0312"
2.0469"
2-1/4"
2.250"
2.2656"
2.2812"
2.2969"
2-1/2"
2.500"
2.5156"
2.5312"
2.5469"
2-3/4"
2.750"
2.7656"
2.7812"
2.7969"
3"
3.000"
3.0156"
3.0312"
3.0469"
3-1/4"
3.250"
3.2656"
3.2812"
3.2969"
3-1/2"
3.500"
3.5156"
3.5312"
3.5469"
3-3/4"
3.750"
3.7656"
3.7812"
3.7969"
4"
4.000"
4.0156"
4.0312"
4.0469"
Last Updated: 02 July 2020