lock differences between the LARGE 21 & 25?

[DrtyHarry]

Can someone please explain to me what the differences are between the large lock on the 25 and the 21? Just curious...thanks fellas!

 

[JustinFournier]

Are you the kind of person who likes pics or a description?

 

[makariotes]

The main difference is the interface between the lock bar and the tang of the blade; the 25 has a ceramic ball that serves as the detent and the interface, the 21 has a smaller ball that serves as a detent for the blade only, meaning the lock bar actually touches the back of the tang of the blade, maybe a pic will help out:
Here you can see the ball

There is a gap between the lock and the blade when it's opened, the ball is the only thing touching the tang:

Here is a 21, no gap, full contact:

Hope that helps.

 

[Nrthfce]

Nice pictures... this produces one solid CRK thunk and a smoother deployment of the 25, instead of the tick-thunk experienced with the 21. One area in which the 25 excels over the 21 IMO.

 

[DrtyHarry]

Very well explained, I understood perfectly. I can't wait for my 25 to arrive!! Again thank you for the pictures and for the explanation!


Harry

 

[uofaengr]

Does the detent of the 25/Zaan/Inkosi permit a free dropping blade at normal pivot tightness? My Zaan never did it, and my Inkosi is going to take a lot more breaking in before it'd be possible.

 

[makariotes]

Nice pictures... this produces one solid CRK thunk and a smoother deployment of the 25, instead of the tick-thunk experienced with the 21. One area in which the 25 excels over the 21 IMO.

I agree, I love the 25 for the same reason, it's awesome.

Very well explained, I understood perfectly. I can't wait for my 25 to arrive!! Again thank you for the pictures and for the explanation!

Harry

You're welcome; the Unnumzaan shares the same ceramic ball interface; when I got into CRK knives last year I got a 25 first and an umnumzaan the Wilson Combat ones; for some reason I wasn't attracted to the 21 at all; then when I finally got a 21 it blew my mind, now I love them all. It is a very strange addiction.

 

[Nrthfce]

Also because of the lock ball interface on the 25, and the lock ball being set back a tiny amount on the lock bar, your lock bar will be further over appearing as a later lockup. There are pictures in another thread showing how to judge your % of lock-up, but don't be alarmed when you first open your 25 and it appears to have a 70%-80% lockup according to lock bar position. In my experience, these numbers actually produce about a 50% lockup when considering where to ball is on the tang.

 

[makariotes]

Also because of the lock ball interface on the 25, and the lock ball being set back a tiny amount on the lock bar, your lock bar will be further over appearing as a later lockup. There are pictures in another thread showing how to judge your % of lock-up, but don't be alarmed when you first open your 25 and it appears to have a 70%-80% lockup according to lock bar position. In my experience, these numbers actually produce about a 50% lockup when considering where to ball is on the tang.

That's a very good point, I can tell by the mark the ball makes in the tang:

 

[tuica]

Thanks for the detailed photos and explanation. Have Umnumzaan; 21; and 25, and have observed this also. Did not think I would like the Zaan as much as I have. Purchased all three slightly used, and it is easily the smoothest and easiest of the three to deploy. Now try the older pivot? Why not.

 

[makariotes]

Thanks for the detailed photos and explanation. Have Umnumzaan; 21; and 25, and have observed this also. Did not think I would like the Zaan as much as I have. Purchased all three slightly used, and it is easily the smoothest and easiest of the three to deploy. Now try the older pivot? Why not.

You are welcome my friend; I agree with you, I also find it the easiest to deploy, but deploy fast, the 21 I don't even try to flick it, it is a pleasure to feel how smooth it is. Yeah, try an old pivot style Umnumzaan, they are about the same but I love the looks of it, the very cool pivot and the blocky gimping on it are really cool; I wish they still made it to be honest. I see them in the exchange once in a while, but they sell usually quick. I recently changed the orings on one of my Zaans and it is a totally different knife now in the way it opens without noise, I love it; also put a TiLock clip on it and it just made it even better, but that is just me and my idiosyncrasies.

 

[DrtyHarry]

I am having trouble sleeping at night waiting for my 25 to arrive. UPS just sent me a notification saying it might get here on Monday instead of tomorrow!! NO!!!!