M7 x 60 in stainless here if that's any use?
http://stainlessmiddleton.co.uk/32-socket-screws
M7 x 60 in stainless here if that's any use?
http://stainlessmiddleton.co.uk/32-socket-screws
BSA Super10 addict, other BSA's inc GoldstarSE, Original (Diana) Mod75's, Diana Mod5, HW80's, SAM 11K... All sorted!
Cheers Tom, but 60mm won't do.
Material doesn't really matter too much, though stainless would be nice.
It's a long stock bolt for a FT stock.
I can get M7x70mm in a hex bolt, but I'd have to try to put a screwdriver slot in it, which ain't going to end up looking very pretty.
That's because I couldn't get a slim 11mm socket in the recessed stock bolt cup, to do up the hex.
If you know somebody with a lathe ask them to turn the hex head to round (diam to suit the stock hole) and then drill a 5.1mm hole in the centre. You can then use a sacrificial 5mm hex bit to drive into the hole broaching a hex socket in for you. You need a 5.1mm drill to allow a little bit of clearance for some metal to move and not grip the hex bit too tight to allow removal. Seeing as it's a stock bolt and not holding a wheel or wing on something an 8.8 grade bolt will do, they're easy enough to machine and to broach.
BSA Super10 addict, other BSA's inc GoldstarSE, Original (Diana) Mod75's, Diana Mod5, HW80's, SAM 11K... All sorted!
easier to rethread a m8 to m7
M7 is a non preferred size that only seems to be used on Push Bikes. I doubt you’d get a bolt that long in a bike shop though?
When I designed and built my last Crossbow I tried to standardise on one bolt size wherever possible and settled on M5 as it is strong enough for many fixing jobs without being too large. It’s also available in a large range of sizes. I have M5 cap head socket screws up to 120 mm long.
Last edited by xbow; 30-11-2017 at 04:56 PM.
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Interesting... I should check if an M8 would go through the woodwork... then I'd only need the last 10mm turned down and threaded to M7.
Another thought - can I get a insert (helicoil kinda thing), to take the receiving thread from 7mm down to 6mm?
I have a M6x70mm allen bolt.
Now this is a long shot but I believe M7 is often used on motor scooters .... maybe give a Lambretta agent a call?
Cheers, Phil
We have a place in Lowestoft called Westgate Fastenings, they do all sorts of nuts and bolts, I could give them a ring Monday morning if you like and see if they've got an M7 x 70mm cap head bolt in stock, it's worth a shot, would save you a lot of faffing about ( I could then post it to you )
Nice thing is they'll sell you a single bolt or nut if you want !
Norm
If you're going to use an M8 then you need to start with at least 70mm plain shank so you're looking at a 100mm bolt minimum. You can't use the threaded part as it's too small when you turn the thread down, tried it today on a stainless bolt and turned down to 6.4ish mm still with a bit of the thread showing, threaded it just to see , the thread was there but probably only half proper depth I wouldn't like to trust it for holding anything.
Thanks Bez', that's good info.
Thanks James, First link: Nothing M7 in the way of socket screws, but they do some nice other bits n' pieces. Nice site.
If you wouldn't mind, Norm - that'd be great. But I'm not hopeful. It seems to be a very odd size.