Supplier for tapered grub screw

Usually sold as BSP plugs which happen to have a hex socket in them. Quite often brass but I have seen black steel ones. BSPT and NPT are normally different pitch for a given pipe size. As you may know the desigated sizes do not correlate with any dimension of the plug itself. Look up thread tables to get the essential dimensions.

Any idea what size the thread is? what is the OD even a relatively rough measure should give the basic pipe size. Ebay would be my starting place searching for things like "BSP taper plug" turns up many hits but I don't think it is really a grub screw. Can you determine if it is NPT or BSP, IIRC only 1/2" BSP has the same TPI as NPT but a different thread included angle. The taper plugs are a pretty common item so when you have determined what it is you just need to find a source.

Seems an odd application for a pipe thread.

Clarify your needs - do you mean that the thread itself is tapered, or is it a pointed grub screw that you need, where the thread is parallel and the tip is pointed?

If the later I always make them free hand on the bench grinder - grub screw held in the appropriate Allen key, then rotate it at the correct angle against the grinding wheel to form the point.

Andrew

I agree that it's unusual. The tapered grub screw is used to spread a section of the mitre bar so that it locks in the slot. Others with the same problem have said that the thread is 1/8-27 NPT (the Shopsmith is made in the US). I'm away at the moment so can't make measurements of the female thread for a few days.

Here you go:

Andrew

I'm grateful and embarrassed - why didn't I see them? Your link led to a further dig around which unearthed a chinese supplier offering 5 for

Glad to be of help :)

Andrew