Currently the links below take you to Woodwork Forums. Will sort this problem out later.If you end up on WWF close the page tab and you will come straight back to here.
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ACROSS FLAT DIMENSIONS OF HEX HEADED BOLT: CLICK HERE
Shaft Diameter to maximum and minimum sizes in both inches and mm

COMPLETE PENMAKERS CHART FOR DRILLS AND BUSHES: CLICK HERE
Match a pen with the mandrel, bushes, drill and blank size.
Chart made by forum member Artme

CONVERSION TABLES: CLICK HERE
Automatically calculate all sorts of stuff.....
Linear, area, volume, weight pressure angle, temperature, wind chill and more.
Also conversion tables for: Length, area, capacity & weight. Imperial to metric and back etc.

DRILL SIZE CALCULATOR: CLICK HERE
Find drill sizes equivalents by:
Provides drill sizes in 1/64 fractions of inch, with equivalents in decimal, wire number/letter and metric.

FUEL ECONOMY: CLICK HERE
Calculate mpg, ltrs per 100k, etc. (imperial measure not US)

GEOMETRIC: CLICK HERE
Calculate: Area of Sphere, Cone, Circle.

SCREW / DRILL SIZES: CLICK HERE
WOOD SCREWS - Recommended Drill Sizes For use on Australian Hardwoods also
Wood & Self Tapping Screw Data Use this chart to convert screw diameter to screw gauge number.


TEMPERATURE: CLICK HERE
Convert: Celsius - Fahrenheit - Celsius - Kelvin, etc