Mount and Bolt Size Reference

BOLT SIZES USA
in size order
#8#103/161/45/163/81/25/8

 

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Comparison Chart
SIZES INCH with the bolts that go in them
HOLE
sizes

 

 .171 

 

 .193 

 

.218

 

.265

 

.272

 

.281

 

.330

 

.343

 

.406

 

.437

 

.531

 

.562

BOLT
inches

 

#8

 

#10

 

#10

 

1/4"

 

1/4"

 

1/4"

 

5/16"

 

5/16"

 

3/8"

 

3/8"

 

1/2"

 

1/2"

 METRIC -------- 5mm  6mm  6mm  6mm  8mm  8mm  10mm  10mm  12mm  12mm