Technical Threaded in dust caps on hub?

Alright folks, I've been trying to do some research but haven't came up with anything solid. A friend gave me some super nice hubs for my hot rod, I'm just trying to figure out if they'll work and what year are they. I know their early Ford hubs, but they have the threaded in dust caps which I believe remember model A hubs having. I'm running square back spindles and need hubs and hoping these will work. And would a picture help or measurement?

 

Also theyre stamped 01A1106-A2
just found a post on here saying their 1940
can anyone confirm that?

 

40 Fords are threaded. HRP

 

My favorite

 

Cool deal, now just trying to confirm if they're actually 40, still doing some research

 

this would be a great time to post some pictures

 

I don't know if he covered this definitely but @Tuck was just covering this a bit in his there'd on his StarDestroyer build. I love the hex thread on caps and am using them as soon as I get the hubs. I've always heard these are 40 hubs. I have a set but they're really rusty, I'm mean really rusty! Don't know if the numbers are visible.

 

Isn't O1A a prefix on all 1940 parts? Bob

 

O1A is '40 Ford.

 

I have some 41 Lincoln's that are threaded.

 

Ya'll guys are great, I have done a lot of research on it, eventually I saw that 36-42 had the threaded dust cap, and and it obviously wasn't 36-39. But once again I thank you all!

 

'41 fords are threaded and possibly up to '48