[smellyfeet]

Hi. I have just replaced my blown cranial gasket and am ready to try again.

I am trying to figure out how to calculate the 6h tolerance position for a M24 x 1 thread and I cannot get my head around it. I find the wording very confusing and each time I (or the others I work with) try, I get a different answer.

Could someone please explain in simple terms or even better, show me where I can find it on the net?

Thank you...

[juergenwt]

Smellyfeet - The reason you can not find M24 x 1 6h is because it is not used.
You have a 6H for the nut but not for the bolt. Bolt threads are 4h, 6g and 8g.
I will list 4h and 6g.
M24x1 4h: O.D. max 24.000, min 23.888. Pitch dia max 23.350, min 23.270
Minor dia max 22.773, min 22.654.

M24 x1 6g: O.D. max 23.974m min 23.794. Pitch dia max 23.324, min 23.199
Minor dia max 22.747, min 22.583.

As per DIN 13 T21

Hope this helps you.

[smellyfeet]

Hello Fella. Its definitely a 6h thread that is specified on our customers dwg. The Machinarys Handbook does go into some detail about calculating a "h" thread at the bottom of the 6g standard tables and lots of reference to 6h on the net but it is not too easy to understand.

Smelly.

[neilw20]

Is the customer always right? Ask him/it/her for more specifications.
I often find customers are after pie in the sky when all they needed was a sausage roll.

[juergenwt]

I am with neilw20. Go back to the customer. Someone on their Eng. staff needs to look up some charts. If they require an "h" limit - it should be 4h.
. If there would be an 6h you could have a very hard time putting a 6H nut onto an 6h shaft since the nut could have 24.000 as its lower limit and the bolt could have 24.000 as the upper limit. Not a real possibility but still theoretical possible. That is why they have a 4h limit available for shafts. This would require grinding the thread. Still could be line to line (theoretical) but a better quality.