Where to get unusual size allen bolts?

[Rickenbacker]

More exactly - where can I get an M7x70mm allen bolt?

Nowhere - that's where...

[rancidtom]

Stainless or not?

[rancidtom]

M7 x 60 in stainless here if that's any use?
http://stainlessmiddleton.co.uk/32-socket-screws

[Rickenbacker]

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.

[rancidtom]

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.

[--ped--]

easier to rethread a m8 to m7

[xbow]

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.

[tinbum]

Oh goody! More toot for the binmen!

[bezzer]

easier to rethread a m8 to m7

That's what I 'd do, get a long enough plain shanked M8, cut the thread off and turn the shank down to 7mm.

[Rickenbacker]

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.

[Phil Russell]

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

[bezzer]

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

Doubt you'd find a long enough one, M7 on scooters and bikes are not that rare but are usually short "special" ones like the ones Suzuki use on a lot of their cylinder head covers

[T 20]

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.

If all else fails, Phil, I can make one and post it to you.

[maximus]

Counter bore the hole in the stock so you don't need such a long bolt

[bighit]

bmw use 7mm a lot in their engines.

could you get a bit of 7mm thread welded on to a m8 allen head bolt?

m7x65mm https://www.clampcouk.co.uk/exhaust-...s-10-pack.html
https://www.clampcouk.co.uk/media/ca.../b/r/br398.jpg

get the rounded bit under the head of the bolt turned down a bit and it may give a bit more length.