They don't look hard to make but a drawing showing material, dimensions and thread would be required to progress to manufacturing.

The other alternative is to pass the nut to someone who can use it as a prototype and copy it.

A rough guide to where you are would help with the second option.

Martin C

What leads you to that conclusion?

In the photos the OP has posted, the part looks a little too metallic for that to be a possibility.

Edited By DC31k on 26/05/2023 17:17:53

Even with dimensions, without knowing the thread (Size, and Form; Whitworth / BSF / BA/ Metric, etc) sadly, it will not be possible for anyone to help. You can't screw a BSF nut onto a BSW threads, for eaxample.

Howard

This sounds like the dreaded "Can you just?"

To make the nut, the raw material will need to be faced, the OD turned to size, knurled, followed by drilling and tapping.,rbefore being eversed in the chuck to be fdaced .

You will need the correct Taps, (A set of three, ideallky. You will have great difficulty using just a bottoming Tap ) and a tapping size drill to cut your own thread.

Once you know what you have to produce..

Producing the thread as a second op, out of the lathe, risks producing it off axis and probably off centre. A job best done in the lathe while turning and knurling the OD.

Unless you are a good guesser, you may need several tries to get the correct nut to determine the thread

(And hardware suppliers are unlikely to be happy sell you just one nut. Some have a minimum order value ). Would you want to pay £6 for one nut only to find that it is the wrong one?

Better to determine what the thread is and to cut it while the job is still in the lathe.

What material do you want? And if steel, do you want it natural or blacked finish?

You need tohave the enswers to these questions before much can be done.

Howartd

As you already have a nut you could work out the pitch by counting say 5 full turns of the nut and measuring how far along the male thread it moves. Then a measurement of the male thread's diameter and country of origin should get you looking in the right direction

diameter looks a bit like 5/32 and tpi should be simple enough with a good rule and eye loupe

Do the turns of the nut test to confirm the tpi

What was the earlier measurement you put on the drawing the OD of the male or the clearance of the female hole in the nut?

What country does the fan originate from as that will be a good indicator of likely threads used

Philip, if I were you, I'd do the following:

Assuming it actually is 5/32" BSW, buy a good quality HSS 5/32" BSW tap set – currently possible for only £3.09. [I have this actual tap set and can vouch for its fitness for purpose].

Buy a suitable, near-enough equivalent, knurled thumb nut. N.B.: you want the one with the through hole, not the blind hole. I have bought quite a few of these in various sizes over the last few years.

The M3 one there is 11mm diameter, and any excess in the "m" measurement can be ground off the underside once you've finished the following procedures:

Slot the top of the nut to the required depth using a hacksaw.

Drill out the M3 tapped hole to 3.2mm.

Re-tap to 5/32" BSW.

Slightly dome the top of the nut by holding it by the underside in a hand drill and rotating against suitable abrasive material.

Use it.

Edited By Bill Phinn on 27/05/2023 13:29:19