Correct sized allen bolts

[bewarethefox]

Anyone know the correct size for allen bolts on a Western H Hutch stem? I've got the oxidized black ones, but I'm building a pink Trickstar and want some stainless steel ones. My local DIY shops don't sell 'em. Once I get the metric size I'll order them off Ebay. Thanks.

[SaMAlex]

They prob aint metric being from the USofA. They might be 1/4 inch UNC or summin? imperial sizes are confusin 

[bewarethefox]

They prob aint metric being from the USofA. They might be 1/4 inch UNC or summin? imperial sizes are confusin 

Its a massive pain I can't believe its so difficult to match 'em up. The metric size are all over Ebay, but I don't know if they are M6, M7 or M8. Argggghhhhh!!

[theRuler]

M8 usually!

[bewarethefox]

I was thinking it was normally M8 but wasn't sure, thats why I posted it here. THANKS!! Now just got to check whether its length is 25,30 or 35!

[mark 2]

Don't buy M8! You'll fook up the threads.........5/16 x 1" UNC is what you need.  Standard thread sizes have changed since Hutch stems were made, it all metric now (M8 for example), Unified Coarse Thread is what you need, aka American Standard, for a 5/16 bolt it has 18TPI, M8 would have 20TPI and the pitch of the thread is different (the base of the thread is thicker). The long and short is it'd fook up your stem....

[Dingobmxer]

I would be VERY suprised if they are metric, as alex sid some kind of unc thread normally on USA stuff (all my S&M stems and DK stems are UNC)

are there not any fastener suppliers near you you could go down and get them to try somebolts in for you?

  DINGO

[mark 2]

This is what you need......


http://cgi.ebay.co.uk/5-16-x-1-UNC-Stainless-Steel-Allen-Bolts-x-6_W0QQitemZ130147512996QQihZ003QQcategoryZ10458QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

[bewarethefox]

Just bought some M8's on Ebay, damn should have waited a minute! Oh well its only a couple of quid! So Mark these are definitely the ones?? I'll get them as well now. Thanks lads, Jonathan.

[mark 2]

They're exactly what you need and as cheap as you'll find them. My local hardware specialist wanted £40 for 8 in stainless!

[bewarethefox]

Just bought them as well Mark,  so thanks for your help fella. I'll post the bike when its finished, superbike dan powdercoated it so he's eager to get some pics up here!! Thanks again.

[mark 2]

Just bought them as well Mark,  so thanks for your help fella. I'll post the bike when its finished, superbike dan powdercoated it so he's eager to get some pics up here!! Thanks again.

Anytime

look forward to seeing another one of dan's sparklers......

[theRuler]

force the M8's in.

it's just a hutch stem

[login_user]

Don't buy M8! You'll fook up the threads.........5/16 x 1" UNC is what you need.  Standard thread sizes have changed since Hutch stems were made, it all metric now (M8 for example), Unified Coarse Thread is what you need, aka American Standard, for a 5/16 bolt it has 18TPI, M8 would have 20TPI and the pitch of the thread is different (the base of the thread is thicker). The long and short is it'd fook up your stem....

As mark says. 

[bewarethefox]

Well I've ordered a few off Ebay so hopefully the UNC ones will fit in fine. This is what its going on, nearly there:

[Moose]

I think it was Mark who pointed me in the direction of those 5/16" x 1" UNC  - and they're spot on 

[bewarethefox]

Well it was really helpful, hopefully I'll get 'em tomorrow. I have a chrome Hutch stem that needs new bolts as well so if the UNC are good which I'm sure they are I'll ship some more in.

[bewarethefox]

Got the Allen bolts this morning and they slid in easy!! Thanks guys. Jonathan.