Is it a millimeter

[Jokerman]

Am I right in thinking that one complete turn of a nut on a metric bolt eg m6 or m8 is equal to onr millimeter of travel either up or down the bolt ?
Reason is for jig making.
Thanks anyone who can help
hh.

 

[Anonymous]

M6 is 1mm per revolution

M8 is 1.25mm (if i recall correctly)

 

[CHJ]

M6 is 1mm per revolution

M8 is 1.25mm (if i recall correctly)

Correct Tony.

A few more:

Thread Pitch for Coarse Pitch Series Threads which are the most readily available in DIY type outlets.
M1 _____ is _____ 0.35
M2 _____ is _____ 0.4
M2.5 _____ is _____ 0.45
M3 _____ is _____ 0.5
M3.5 _____ is _____ 0.6
M4 _____ is _____ 0.7
M4.5 _____ is_____ 0.75
M5 _____ is _____ 0.8
M6 _____ is _____ 1.0
M7 _____ is _____ 1.0
M8 _____ is _____ 1.25
M9 _____ is _____ 1.25
M10 _____ is _____ 1.5
M12 _____ is _____ 1.75
M14 _____ is _____ 2
M16 _____ is _____ 2

 

[Philly]

I must say-its handy having you guys around!
Cheers
Philly

 

[jasonB]

Those are correct for the prefered metric sizes but you can get the following which are still ISO metric threads.

M6 x 0.5, 0.75 & 1.00
M8 x 0.75, 1.00, 1.25 & 1.5

If going for the M8 a 1.00mm pitch would make calculations easier but you will likely have to cut the thread yourself. M6 will be available off the shelf as nuts, bolts, studding etc

Jason

 

[RogerS]

Are those figures for Metric Fine or Metric Coarse?

 

[Jokerman]

thanks for all ypur help guys - just brilliant. will i ever be as clever as you when i grow up?
hh.

 

[Anonymous]

M6 x 0.5, 0.75 & 1.00
M8 x 0.75, 1.00, 1.25 & 1.5

Jason

Also M10 x 1.0 and M10 x 1.25

Roger

Jason's are metric fine and the others are standard metric threads

 

[RogerS]

Tony

Which ones do you get when you buy a metric bolt or screw thread from Acme Building Supplies? I usually just see Metric.

Roger

 

[Taffy Turner]

The easiest way to check for the purposes of jig building is to get the bolt you are intending to use, and measure the distance from the top of one thread to the top of the adjacent one.

A more accurate way is to measure ten threads, and divide the answer by ten - using this method should give you a reasonably accurate result using a rule, for those that don't possess a vernier caliper.

The easiest way of all is to pick up a set of thread guages from your local tool supplier!

The distance between the "peaks" on the thread is known as the pitch, and is the distance that a nut will travel during one full revolution.

Regards

Gary

 

[jasonB]

Off the shelf nuts & bolts from building supplier / DIY shed will be M6x1.0 & M8x1.25.

M18 is the one with the most sizes of taps & dies available, 6 different pitches in my catalogue. Then you can always use the Metric angles and cut your own threads if you have got the right machines

Jason