Safe minimum for hub axle length?

OK, I have put together a System EX hub with a carbon fork. The fork ends are fairly thick because they are aluminium. The axel is not long enough to stick out past the track nut. You can see from the picture it is a couple of millimetres short (both sides obviously)

Question: is this safe/normal/OK?

Thanks for your help if you can answer...

if you can bang the wheel up and down on the floor a few times/ hold the bike with the front brake on and rock it b/forwards with out it moving it will be fine.

I'd be more worried if it was the rear. Looks like it'll be fine though - Make sure it's even both sides though.

Thanks Pifko and 31t®um

Thanks Pifko and 31t®um

Looks like you would be ok to me, but if you want to give yourself peace of mind just replace the track nuts (with the built in washer which is usually around 4mm) with a standard nut of the same depth and a slim washer.

Track nuts have no thread under the built in washer area so (effectively) removing the built in washer (by replacing it with a standard nut) engages no less threads on a standard axle - (in the illustration below the two threaded areas of both nuts are the same).

P.S. the axles are the same length on these two pictures, the lower one looks longer but that's an optical illusion.

Black = axle
Pale blue = fork end
Orange = track nut with built in washer

Black = axle
Pale blue = fork end
Pale green = standard nut
Darker green = washer

have to say, nice drawings there that man

have to say, nice drawings there that man

Why thank you madam.

Thanks Tynan, a good solution and excellent draughtsmanship to boot.

LBS for the standard nuts and washers or do you have a cheap online source up your sleeve?

Thanks Tynan, a good solution and excellent draughtsmanship to boot.

LBS for the standard nuts and washers or do you have a cheap online source up your sleeve?

any bike shop that doesnt give you those for free are cunts.

Great drawing tynan, you drew all that with the interlocking threads just for the sake of a post/comment? Well done.

any bike shop that doesnt give you those for free are cunts.

Great drawing tynan, you drew all that with the interlocking threads just for the sake of a post/comment? Well done.

I thought it was easier than doing it in words, only took a couple of minutes. It was all step and repeat in photoshop, I didn't have to draw much beyond a rectangle, one small triangle and a circle.

Thanks Tynan, a good solution and excellent draughtsmanship to boot.

LBS for the standard nuts and washers or do you have a cheap online source up your sleeve?

I use Tasty Nuts for my nut needs, steel nuts shouldn't cost you any more than a quid each.

http://www.tastynuts.com/site/frames/frameset_shoponline.htm

The titanium ones (£3 for M10) come in a few colours.

On a different (but slightly related topic) Evans Waterloo Cut charged me:
First visit: two hyperglide pins £0.20
Second visit: two hyperglide pins and a powerlink £3.00
Third visit: two track nuts £0.00

So I'd say that "they'll only charge you if they are a c***" depends entirely on who serves you.

Apart from the inconsistency which I found slightly puzzling I had no issues paying each time.
I did prefer the last however.