Small screw threads.

[ukracer]

Could it be 4-40 ?

ANSI Internal Screw Threads Size and Tolerances Table Chart

Unified Screw Threads per. ANSI/ASME B1.1-1989 Reference Table Nomenclature, are used. Acceptability criteria

www.engineersedge.com

The major id is 2.84 so I doubt it's that.

 

[Dapph2]

I am looking for the size of a bolt that fits a Japanese sewing machine to hold the needle bar thread guide.
2 mm is to small. 3mm is to big.
(Well I say Japanese but it was made in the UK)

I had some 2.5mm coming today but as I suspected it's an imperial size ..

So i tried to rethread a 2.5 bolt into the original hole in the needle bar. But it gets very tight very quickly so I need to either tap the thread in the sewing machine (needle bar) or run a die down the bolt i am using.
Problem is I don't know what that thread is going to be. Google seems to indicate 3/32 but I am wondering if it might be BA size.
I don't suppose we have any small thread experts on the forum??

Racer...
Put up a picture or three so we can see/ know the style of screw needed to fit into bar . I have various sewing machine screws. & think I may have one for you.

 

[indykid]

3-48 then?

It's roughly 2.5x0.5 in metric terms (2.5146 x 0.5292mm)

 

[ukracer]

Racer...
Put up a picture or three so we can see/ know the style of screw needed to fit into bar . I have various sewing machine screws. & think I may have one for you.

This is the best image of the hole for the screw that holds the guide on.






Problem is I don't know what it looks like. Allegedly it also sets the needle height. But I took.it out to check the diameter of the wire used for the guide. The guide had snapped of and long gone but I can't find the screw.
It not unexpected as my wife constantly moves things around..

 

[ukracer]

Racer...
Put up a picture or three so we can see/ know the style of screw needed to fit into bar . I have various sewing machine screws. & think I may have one for you.

This is the best shot I have been able to find.