Rim Spline Sizes

[blsnelling]

How many different rim splines are there? I thought from @SawTroll that there were three: Mini (Stihl only), Small, and Standard (sometimes called Large). I have two 3/8 7-pin sprockets in the garage that are neither. What other spline sizes are there?

Here's what I measured the ID to be, rounded to the nearest .005".

Standard - .875"
Small - .765"
Mini .675"
Mystery - .820"

 

[RedneckChainsawRepair]

Maybe in this stuff?

 

[CR888]

When you buy the cheapest chinese copied sprockets mystery spline sizes are normal and common!lol

 

[blsnelling]

That Mac small spline is even a different size yet. I have no idea where these two rims came from. They are new though, so didn't come off an old saw.

 

[Philbert]

Couple threads on this. On my phone right now, so I can't find it, but one with posts by heimann with lots of illustrations.

Philbert

http://www.arboristsite.com/community/threads/teach-me-about-sprockets.274953/

http://www.arboristsite.com/community/threads/rim-sprockets.260164/

 

[Franny K]

There is or was a 9 spline for 1/4 inch chain 9 tooth which allows for debris clearing cut outs on the side. They com in a box from Oregon with a matching drum. Strange thing is they measure 20 thousands bigger than the Oregon 9 tooth small spline radially ported rim sprockets.

 

[Philbert]

OOOPS1 (it was on another site). PM sent.

But here are some other good references:
http://www.oregonproducts.com/pdf/sprockets/RimSproxFB0601.pdf
http://www.oregonproducts.com/pdf/sprockets/SpurSprocktFB0601.pdf

Philbert

 

[blsnelling]

This is a 7 spline 3/8 7-pin rim.