Coupler size help

[Woohoo\o/]

I'm new to boating needles to say. I'm having a marvelous time understanding coupler sizes. I need a coupler for the following setup.

Motor shaft: 5mm
Flex shaft: 4mm

So I'll need a coupler that's 5mm to 4mm flex shaft is this correct? Is that sold here? Can someone point me out?

Thanks and happy 2023

[koen]

OSE sells them and every thing you need

[tbonemcniel]

Right here on OSE: https://www.offshoreelectrics.com/pr...prod=ose-81513

[CJPB32]

Open the sales items page here at OSE.

Product ID ose-81513
In Stock 20
OSE 5mm to 4mm Collet steel coupler

[Woohoo\o/]

Awesome thanks. So just for learning purposes what is positive rotation and negative rotation when purchasing a coupler?

I know it's the direction the drive system rotates. But which is which? Positive = clockwise?

Sorry for the noob questions.

[Woohoo\o/]

That clears it up for me thank you.

[Panchothedog]

Never heard of the right hand rule. I guess it works. Sounds quite confusing. Look at the boat from the back. Looking at the transom. Standard rotation is ccw. If you are running twins then you need a reverse wound flex cable and a prop usually designated with a R at the end of its size. Both are appropriate cw rotation. Actually quite simple.