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HOW TO MEASURE
Hex bolts are measured from under the head to the tip of the bolt.
Wood screw measurement depends upon the type of screw you are using.
Machine screw measurement depends on the style of head it has.
Carriage bolts are measured from directly under the head.
Lag Bolts (Lag Screws)
Lag Bolts are measured from under the head.
Sheet metal screw measurement depends upon the type of screw you are using.
Socket screw measurement depends upon the type of screw you are using.
Eye Bolts are measured from under the eye.
Hanger bolt length is measured from end to end.
Shoulder bolt length is measured as the length of the shoulder.
Sex bolt length is measured from under the head.
Here's a formula sent in by Geoff Sharpe, for working out the exact diameter, in inches, of the shank of a screw.
Multiply the screw Number by .013 and add ".060.
(No.) 8 x .013 + ".060 = ".164
(No.)10 x .013 + ".060 = ".190
My thanks to Jason Lee Olson for correcting the original formula shown
Jason has also suggested you could convert the screw number to to decimal
e.g. No. 8 = .008 and use the following formula.
Screw No. 8 - .008 x 13 + .060 = .164 (No. 8 diameter in inches)
Screw No. 6 - .006 x 13 + .060 = .138 (No. 6 diameter in inches)
Should you require the diameter in mm then multiply the answer by 25.4.
Screw No. 8 - .008 x 13 + .060 = .164 (No. 8 diameter in inches) x 25.4 = 4.166 diameter in mm
Screw No. 6 - .006 x 13 + .060 = .138 (No. 6 diameter in inches) x 25.4 = 3.505 diameter in mm
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