locking ring on shaft

captpete wrote: 5/16 it is   picked two up at the local hardware store - stainless hex head Thank You.

Make sure you drill them so you can safety wire them.

Tim

I would say there isn't a standard size and it depends on who manufactured the ring and what they used. None the less get a screw that works then go to the store, or just measure across the threads in the hole, it's going to be the closet 1/16 incrument.

Ring is 10-32 and the coupler is 5/16-18. I have a whole bag of stainless ones (5/16). Post your addy and Ill drop 2 in the mail to you.

It is not the coupling, it is the ring or collar that prevents shaft loss if it separates from the coupling.   It prevents the shaft from spinning through the stuffing box and ending up, along with the prop, in the briny (or fresh) deep. But, Peter, I really appreciate the pictures.

Set screws in coupling:

Square head


Cup point


Peter, You'll have to measure the exact length. They should be around 3/4"

Peter, On the end of the prop shaft you will have a coupling with 4 bolts that connect it to the coupling on the trans. This is what I believe you are referring to. There may also be a set (safety) collar with one set screw in it. It's there so you don't loose the shaft in case it breaks behind the coupling or becomes loose from the coupling. Ether way, the set screws in the coupling are probably 5/16" and the set collar 1/4". Try a bolt in ether to determine the size and go to the hardware store. The coupling set screws are square head. The safety collar would be a hex socket head.