do koken fixed and flex extension require koken sockets?

[cdoublejj]

i just kind of assumed they would work with any socket

 

[ohhimark]

I haven't had any issues with mine.

 

[Fedwrench]

I think that's a safe assumption. I think the only possible issues would be sockets without the drive tool retention ball cutouts, or possibly the Craftsman sockets where they used that double detent ****.
I use a wide variety of sockets with my Ko-Ken extensions just because, I like the deep knurled grooves on the Ko-Ken extensions.

 

[Callelle]

I have Koken wobble fix 1/4 extensions and use them on my Carlyle, Matco, and Capri sockets without problems

 

[2ndGearRubber]

I have fixed/regular type Kokens in 1/4 and 3/8, used to use wobble Kokens in 1/4. I have yet to find any socket they won't work with, which is really the point of standard drive sizes. That said I'm sure some goofy-*** brand has designed an extension/socket/system which somehow doesn't work properly with other brands.

 

[mreisner]

They work just fine with anything I've tried on them which includes Astro Nanos and Snap-ons and Mac and Proto and Williams and Wright. Some seem to fit or are retained a little tighter than others but they all work.

 

[benne]

I have the same experience as the others, haven't found a socket they don't work with.