I need some machine screws help.
Fixing a 1968 Industrial Sears sewing machine and need 2 set screws that are missing.
A 1/4 28 thread screw will start into hole but binds up after a full turn.
I figured it may be a m6x1.0 metric but that does the exact same thing. It binds up after less then one turn.
Anyone have an idea what thread pitch it may be??
As a side note the m6x1.0 threads easily into a 1/4 x 28 nut. Seems to be same pitch as the 1/4x28 screw..
Any help is appreciated..

Possibly British Whitworth thread pitch. Also possible a good sewing machine repair shop could help.There are several ma and pa type shops in the US.
Sewing machine plus, name rings a bell.

Thanks for the input Island Dude.
I will check it out.

Decided to see if I could stumble across anything with Google.

Found the following but have no idea if it might help you.

Good Luck!

• Special Singer screws

Thanks Jack.
You were right on.
Special screws.
Found them on eBay..
Fit nice..
Thanks

Howdy Steve! Have you tried running a tap through it to see if a previous owner boogered up the threads?

Thanks Ed.
I was thinking of running a tap as a last resort but I did not want to bugger up the exist in case they were some odd thing. Turns out they were odd.
Also the base looks like cast iron or cast steel. It is also rather thin around the screws and I did not want to crack base or weaken the threads..
I found the correct old screws and they went right in. Now we can sew boat tops and seats..