Help! > Machines, Tools and Fixtures

Maximum internal thread

(1/1)

PaulR:
What's the maximum possible/advisable/sensible internal thread for a given size of bar and material. For example, would it be possible to cut an internal 10mm thread in a 1/2" round brass rod or is more 'meat' likely to be required? Seeing as it's perfectly possible to cut external threads of 1mm or less it seems like the inverse should apply. What about the same sizes in mild steel? Is there a rule of thumb?

Paul
(Someone has to ask the daft questions right?)

Jasonb:
A lot will depend on what the thread is doing, if under a lot of load you would not want to go as thin as you would if there was little load.

But yes a M10 thread could be cut in 1/2" bar and still be quite strong.

PaulR:

--- Quote from: Jasonb on February 15, 2025, 08:26:46 PM ---A lot will depend on what the thread is doing, if under a lot of load you would not want to go as thin as you would if there was little load.

But yes a M10 thread could be cut in 1/2" bar and still be quite strong.

--- End quote ---
Thanks for this. The use I was thinking of involves very little load, I was more concerned about tearing the material. If I had a scrap bin I'd give it ago but I haven't made any serious boo-boos in suitable material yet :D

Jasonb:
You could always go with a finer pitch such as M10 x 1 rather than the usual M10 x 1.5 this is why pipe threads are finer than your typical fastener threads

Admiral_dk:
It sounds wrong - but finer Pitch often has a bigger load capacity ....

Perhaps that is why 1mm. Pitch is used on a lot of big diameter threads for plugs ....

Per            :cheers:

Navigation

[0] Message Index