Thread: 11mm nut no such thing

ISO metric screw thread - Wikipedia, the free encyclopedia

isn't the world most autoritive source, but it's readable. You ahve a problem in that that thread is outside the standard iso range. If you just want something to fit you could get someone with a lathe to turn the thread inside an M10 nut, or make one from scratch.

Annoying, they obviously want you to buy the part, or a replacment assembly, from them.

Thanks Damian, but I don't think too many engineering shops would be willing to turn up one nut for me, regards Neil

Check the pitch again on the bolt you have. While there is no 11mm dia, thread listed in Machinerys Handbook, 11mm equals 0.4330" and 7/16" equals 0.4375". A difference of only 0.0045". The bolt might be a 7/16" diameter bolt but the pitch is not near a standard size as an Imperial pitch.
A 1mm pitch equals 25.19 tpi and the nearest size in an Imperial thread is 28 tpi. This size thread is 7/16 -28 UNEF and it might be the thread you want. Failing this, you have a "special" thread used by the bike manufacturers to suit themselves and be a pain to everyone else. If the thread on the bolt is a bit chewed up and/or the thread in the nut is also a bit chewed, then the 7/16 UNEF thread might be the one you need.

Kody

+1.

Alternatively, have a scrounge around a Peugeot car in your local wrecker's yard. Peugeot used the ocassional M11 x 1.0 fastener and nut.

"""because as I have found out this is a special hub that was made in China for Shimano and why they used 11mm is anyone's guess. """


Ah!!!! the old Shimano Japanese metric thread trick, they do the same on thier fishing reels .


Kev.

You can buy a Tap .

"A 1mm pitch equals 25.19 tpi and the nearest size in an Imperial thread is 28 tpi.
Kody"

Hey Kody, there's 2 you missed, both 26 tpi: Brass thread (BSB, 55 deg) and Cycle thread (BSC, 60 deg)

Jordan

Hi my first post

I would put my money on the 26 TPI cycle thread it was used on push bikes also used on all british motor cycles hence the name Cycle Thread.


Warren.

Hi 3 cav 84a,
I attach a thread chart and what you have is a Swiss B Metric Thread.
As Woodwould suggested try European Car Wrecking Yards or a Car Dealer Spares Shop as they may have a nut to suit.

Regards,
Keith.

Not trying to hijack this thread, but the reference to 11mm reminded me. I have a socket set at home that has an 11mm socket in it. I have never come across an 11mm nut or an imperial nut that's close. Why is this so? LOL
Anyone else seen this before.

bollie7

It's a metric fine thread, and they're used a bit on bicycles, the rear hanger is 10 x 1.0 for example. Often there's a good reason for using the fine threads so don't poo poo them too much.

Assuming you've tried the usual suspects such as Coventry Fasteners etc and you're forced to make your own I'd suggest grabbing a tap off ebay. HSS Metric 11 MM Second Cut Tap 11mm x 1.0mm M11 - eBay, Other Metalworking Tools, Metalworking Milling Welding, Business, Office Industrial. (end time 08-Nov-09 23:45:19 AEDST)

If you're desperate I'd look for a whole new hub or wheel on ebay and use the one you have for parts or visa versa. Otherwise you could always just get the tap and hand cut/file a nut from some 3 mm steel. PIA job but that thin wouldn't take too long and 3 mm steel can be found in all sorts of places if you look around.

Pete

Edit: the problem I'd suggest with trying to buy one off the shelf will be as much about the thickness as the thread size, so not unremarkable if you have trouble finding one.

I've used an 11 mm in a 7/16 nut as said above. Can't remember if I've ever run across an 11mm nut.

Well done all for lateral thinking. I just assumed it must be metric, forgot about ba, cycle etc

Sigh. We should have just stuck with whitworth and been done with it

Originally Posted by bollie7

Not trying to hijack this thread, but the reference to 11mm reminded me. I have a socket set at home that has an 11mm socket in it. I have never come across an 11mm nut or an imperial nut that's close. Why is this so? LOL
Anyone else seen this before.

bollie7

11mm (AF) fasteners are common on motorbikes.

Kody, I don't think the Machinery's Handbook is complete with regards to these thread sizes. I also couldn't find any reference to M11, as you pointed out, but clearly they're available and can be readily purchased on ebay. Metric sizes are used exclusively on bikes now to the best of my knowledge, hence I suspect the M11 x 1.0 would be accurate. The machinery's handbook also doesn't seem to list M10 x 1.0 that I could see, yet just around my home alone I can think of 3 examples; bike derailleur hangers, the steam tips on commercial espresso machines (yes I have plumbed in a commercial coffee machine in our kitchen. Mmmmm coff-feeee), and the M10 spark plugs in my car. I find the Engineers Black Book a lot more user friendly and has paid for itself 10 times over in the past 6 months. It lists M10 x 1.0 as a "metric special pitch" (though I've seen it elsewhere as simply in the Metric Fine range), but still no mention of M11.

Pete