Threaded Inserts Measuring

endecotp · Sunday at 8:35 PM

The diameter of a metric bolt is the outer diameter, including the threads. Ideally measure with callipers; if it says e.g. 5.9mm, that’s an M6 bolt. If you don’t have callipers, try to measure across the end with a ruler.

A fire door might have enough solidity for this to work, but do be aware that you might not get enough grip.

markjg123 · Sunday at 8:40 PM

endecotp said:
The diameter of a metric bolt is the outer diameter, including the threads. Ideally measure with callipers; if it says e.g. 5.9mm, that’s an M6 bolt. If you don’t have callipers, try to measure across the end with a ruler.

A fire door might have enough solidity for this to work, but do be aware that you might not get enough grip.

Thanks for all your help. Much appreciated.

robinbanks · Sunday at 8:52 PM

markjg123 said:
These.View attachment 377760

There isn't much science to it; you just buy the entire selection box and see which one it screws into

mattylad · Sunday at 9:15 PM

The thread on the pictures of the handle do not look like metric threads, too coarse.
Did you buy the handles online? It should say the thread size on the webpage.
Else you can always have a trip to your local hardware store and have a try at some other nuts etc.

markjg123 · Sunday at 10:26 PM

mattylad said:
The thread on the pictures of the handle do not look like metric threads, too coarse.
Did you buy the handles online? It should say the thread size on the webpage.
Else you can always have a trip to your local hardware store and have a try at some other nuts etc.

Yes, from a UK based retailer. I suppose that doesn't necessarily mean the items were made in the UK though. The webpage doesn't have that information.

markjg123 · Sunday at 10:26 PM

robinbanks said:
There isn't much science to it; you just buy the entire selection box and see which one it screws into

Good point. I think I need M4s.

foxhole · Sunday at 10:41 PM

Threads on door knobs and handled are coarse and unlikely to fit any inserts . You could just drill a hole 1-2mm smaller than bolt and screw the handle on using the bolt (remove nut).Spot of adhesive as well to secure .

endecotp · Sunday at 10:58 PM

To measure the pitch, put the bolt next to a ruler and measure the distance that ten threads take. M4 coarse is supposed to be 0.7mm per thread, so 10 will be 7mm. M4 fine is 0.5mm per thread, so 5mm for 10.

(See e.g. the last table on this page: https://www.apollointernational.in/iso-metric-thread-chart.php )

markjg123 · Sunday at 11:39 PM

foxhole said:
Threads on door knobs and handled are coarse and unlikely to fit any inserts . You could just drill a hole 1-2mm smaller than bolt and screw the handle on using the bolt (remove nut).Spot of adhesive as well to secure .

I thought of this but wasn't sure it would be secure. Which adhesive do you recommend?

foxhole · Monday at 12:12 PM

markjg123 said:
I thought of this but wasn't sure it would be secure. Which adhesive do you recommend?

Fixall.

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Threaded Inserts Measuring

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