Basic dimensions nut and flange

[Anonymous]

Hi, I'm new to mechanical engineering and there's some things I dont understand when I'm reading a drawing, i.g. if a flange is 125mm long, and it got the dimensions M12x50 and M12x25, which diameter does it have and how long are the two dimensions?

Plus, does M12 mean the same for a hole in diameter as on a flange or nut?

Kind regards

Joakim

[Xun.Zhang · Accepted solution]

Hi Joakim,

This is a good question for mechanical design, so firstly, you have to understand the standard of this drawing. From the image, it look more like a ISO standard. Then, you can go to standard handbook to understand more about the thread information.

In your image, it seems M12 is the thread size and the thread length is 25 and 50, Hope it helps for you and a model is attached for your reference.

[Anonymous]

Thanks!

[Anonymous]

How would for example this one be? Thread size 12 and thread length 1.75? What does 8mm stand for?

[SBix26 · Accepted solution]

Here's a quick reference to machine threads from University of Florida's Department of Mechanical & Aerospace Engineering that should be helpful: Fastener Handout.

In your second image, I don't understand how that item is called a nut, because it has an external thread... but that thread is Ø12mm and the standard 1.75mm pitch (which was assumed on the first drawing), and runs the whole length of the piece (since no length is specified).  The 8mm refers to the hex drive socket, though I can't tell you what the "A/F" means.

Sam B

Inventor Professional 2018.2.3
Windows 7 SP1

[mcgyvr · Accepted solution]

---

@SBix26 wrote:

Here's a quick reference to machine threads from University of Florida's Department of Mechanical & Aerospace Engineering that should be helpful: Fastener Handout.

In your second image, I don't understand how that item is called a nut, because it has an external thread... but that thread is Ø12mm and the standard 1.75mm pitch (which was assumed on the first drawing), and runs the whole length of the piece (since no length is specified).  The 8mm refers to the hex drive socket, though I can't tell you what the "A/F" means.

Sam B

Inventor Professional 2018.2.3
Windows 7 SP1

---

@SBix26 A/F = across flats 

[Anonymous]

Thanks for the help!

/Joakim