The Break Room (Non-Technical Discussions)

[#1]

For metric dimensioning of holes what would N°8 M12X1D mean? Sorry that I am not really sure where this would go, a guide to metric hole dimensioning standards would be great. 

[#2]

What's your AutoCAD platform?

[#3]

I believe an M12 thread is a bolt with an outside diameter of 12mm.  So the question logically arises: are you drilling a hole to tap a thread for this bolt, or a hole that it can pass through without hitting the edges?

My gut feeling is that you will get the best answer if you ask the person who gave you this spec.

Do any of these help:

http://www.efunda.com/DesignStandards/screws/screwm_coarse.cfm

http://www.efunda.com/DesignStandards/screws/screwm_fine.cfm

http://www.metrication.com/engineering/threads.htm

http://en.wikipedia.org/wiki/Metric_thread

I think the 1D part refers to the hole being the depth of 1 diameter.

http://www.engineeringsupplies.co.uk/metric-fine-helicoil-insert-pack-1000-p-7453.html

[#4]

I wonder if the N 8 is the grade of the bolt/screw?

Your answer is one of the thouroughly researched and complete ones that needs a Kudos.

[#5]

Thanks Charles, but with Google to hand it doesn't take much to find a few interesting sites!

By the way, on the subject of Kudos, your signature line is a little incongruous on this forum! 

(mine too, I guess)

[#6]

Should we ask for an alternative signature for non-Kudos Forums?

You are absolutely right about Google making things easy but you took the time to look and find those sites when the OP did not do so. They looked for the easy answer; hopefully finding it here, and found out that they needed to do some research for themselves. A good local hardware store may have been an answer for them too.

[#7]

It is a little confusing, and usually you would say M10 x 15 (as an example for a hole that is a 10mm metric thread by 15mm deep)

The x1D bit is odd, maybe it's a typo or dodgy old drawing that's hard to read

I don't suppose it actually says No8 M12x10 does it? If it did it would mean:

No8 is the quantity - 8 off holes

M12 is the thread - M12 thread (standard is 12mm diameter by 1.75mm pitch)

x10 Would usually be depth after the thread size, so 10mm deep

Hope this is useful.

Rory

[#8]

Rory, the link I posted earlier show the D referes to the diameter.

So the depth of the hole is equal to the diameter.