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