Unusual nut size?

[alancaddy]

Hi all

Apologies if this is wrong section but wasn't sure where to put it. Does anyone know if it possible to get an M6 nut which fits a smaller spanner than 10mm?? And where?

Thanks..

 

[the snooper]

does it need a hex head ? if not how about cap bolts

 

[alancaddy]

Thanks for your reply. The bolt itself is a carriage bolt (low profile dome head with square shank just below the head) which once inserted through the hole will leave the threaded part too close to steel box section to turn a standard m6 nut. So I was looking to see if something smaller was available, although this might compromise strength.

If I could get a bolt with a low profile hex or cap head (max 2mm) then I could potentially be ok to use standard sized nut as would be able to tighten from the head.

 

[hotrodder]

JIS (Japan Industrial Standard) nuts are often smaller spanner sizes that the DIN sizes we're more used to, dunno about M6 off the top of my head but M8 are 12mm instead 13mm and drive me mad... look at fastener, grab a 13mm and it doesn't fit!!

K-nuts (jet nuts) are definately smaller hex sizes all the way down to stupidly small sizes but if access is part of the issue i'm guessing them being self locking might not be useful?

Allen nuts / internal wrenching nuts is another way. If you only need a couple ask at your local bicycle shop- V brake pads are often secured with these in M6 x 1.0mm that takes a 5mm or sometimes 6mm allen key and the body of the nut is pretty slim, certainly under 10mm OD

should have refreshed the page before posting

 

[Digger6135]

Buy some M4 nuts then tap them out to M6, This will give you 7mm across the flats, just a thought!

Digger6135

 

[Pete.]

Yamaha motorcycle exhaust manifold nuts. Round on the outside, threaded on the inside one end with a hex socket the other.

For example: http://r.ebay.com/Hk3Fzx

 

[the snooper]

could look for some sleeve nuts or countersunk socket screws flat head allen bolts or even both

 

[Spark plug]

Roofing bolts?

 

[Wedg1e]

JIS (Japan Industrial Standard) nuts are often smaller spanner sizes that the DIN sizes we're more used to, dunno about M6 off the top of my head but M8 are 12mm instead 13mm and drive me mad... look at fastener, grab a 13mm and it doesn't fit!!

Yep, I've definitely seen M6 nuts that needed a 9mm spanner... but can't recall where, although probably a (Japanese) motorcycle.

 

[hotrodder]

Yep, I've definitely seen M6 nuts that needed a 9mm spanner... but can't recall where, although probably a (Japanese) motorcycle.

Makes sense, i've got a vague recollection some push bike stuff used to be 9mm hex for m6, IIRC it was more common for some pinch bolts so you didn't need two 10mm spanners

Googled small hex M6 nuts and got http://www.stainlessautomotivefastenings.co.uk/index.php

If I could get a bolt with a low profile hex or cap head (max 2mm) then I could potentially be ok to use standard sized nut as would be able to tighten from the head.

Flanged socket button screws are close, 3.3mm head depth and 13.6mm OD for M6 x 1.0

Another way would be sleeve nuts like http://www.hafele.co.uk/shop/p/nuts/m6-sleeve-nut-nickel-plated/47770/1134

 

[rosinante]

Hi It is quite common to have a bolt head smaller than the nut ie 12mm bolt = 18mm af 12 mm nut = 19mm af, all so that you dont need 2 spanners the same sizre in your tool box,I look after lots of German and frech equipments that have this arrangement of fastners.
Cheers

 

[MrFluffy]

Yep, I've definitely seen M6 nuts that needed a 9mm spanner... but can't recall where, although probably a (Japanese) motorcycle.

Being sad... The camchain sprocket bolts on the older honda c50/70/90 stepthrough engine. I remember this because I had to purchase a 9mm combo + a socket especially for this job when I worked in a bike shop.

 

[rtbcomp]

Buy some M4 nuts then tap them out to M6, This will give you 7mm across the flats, just a thought!

Digger6135

A guy I knew spent hours filing down hex nuts to achieve a smaller hex size. My suggestion (after he'd finished) to buy the correct hex nuts and then drill & tap didn't go down too well.

 

[wyn]

Use an M5 coach bolt.

The domed head is 3mm smaller in diameter.

 

[normspanners]

Thats nut unusual ( to me)

You can get 12 points or bi hex 6x1 that use 8mm socket. https://www.pegasusautoracing.com/productdetails.asp?RecID=9354
Or self locking hex 6x1 that use 7mm socket https://www.pegasusautoracing.com/productselection.asp?Product=MJET
uk http://www.enginepartsuk.net/arp

 

[dobbslc]

Some Yamaha bolts are M6 with a 8mm spanner size.
They mostly have a flange as well.

 

[Pete.]

Some Yamaha bolts are M6 with a 8mm spanner size.
They mostly have a flange as well.

A large proportion of Jap engine casing bolts are like that.

 

[Robotstar5]

A large proportion of Jap engine casing bolts are like that.

Also used a lot in the car industry

 

[normspanners]

Why are we talking bolt heads when the op wants nuts ?

 

[Rocketman]

Why are we talking bolt heads when the op wants nuts ?

Because you are all nuts.