Wheel Nuts Size

[jerrysimon]

Ok I give up

What are the wheel nut sizes on my Suzhou Bafang SWXB electric hub wheel ?

The flat is 10mm, the thread thickness is 11.92mm but a 12mm nut don't fit. I have tried Halfords, another specialist bike shop and a dedicated tool shop. No luck. The tool shop found an imperial (UNF/UNC ?) thread, 7/16th I think, that sort of fitted but was loose. Are these old specific bike threads from the 60/70s or something ?

I have a closed ended (dome) nut and really wanted an open ended nut as now I have fitted a torque bar and a washer on the outside of that, I want to make sure I have enough thread on the nut. Probably just paranoia

The nut on the motor wire side is perfect, open and has a serrated edge to grip, so I wouldn't need the additional washer.

Closed Ended Dome Nut (but what size ?)

Just checked my terminology the one I want is called a flanged nut

Regards

Jerry

 

[jerrysimon]

Anyone

Ok when you have all finished debating freewheels then how about a simple question about nut sizes

Man that sounds so wrong

Jerry

 

[flecc]

Ok when you have all finished debating freewheels then how about a simple question about nut sizes

Man that sounds so wrong

Jerry

Sorry Jerry, just seen this.

It's 12 mm with a 1.25 mm thread pitch.

Might be difficult to locate spares other than from these hub motor sources, though that pitch is not uncommon
in this size.
.

 

[jerrysimon]

Thanks flecc

Jerry

 

[Tiberius]

As flecc says it is metric, but its fine pitch, not the normal M12.

I have a bag of M12 nuts I bought thinking they would fit.

Nick

 

[jerrysimon]

I have a bag of M12 nuts I bought thinking they would fit.

Me too

I found a few online. Not any with a serrated flange but I guess an ordinary nut and and vibration washer will be fine.

M12 x 1.25 Full Nut DIN934F A2


Jerry

 

[flecc]

Glad you found some Jerry. I like their single pricing, one for 75p. Though it might seem high, it's better than the
DIY store way of making you buy a whole packet of 'em, with much of those sales ending up in landfill eventually.
.

 

[Caph]

Sorry Jerry, just seen this.

It's 12 mm with a 1.25 mm thread pitch.

Might be difficult to locate spares other than from these hub motor sources, though that pitch is not uncommon
in this size.
.

Just wanted to add my thanks for the info Flecc.

I managed to strip the thread on my dome nut by overtightening and got hold of an M12 nut from work only to find the TPI wasn't right. I was stumped.

I might have known a quick search of this forum would reveal the answer. I've plumped for stainless steel this time to combat the rust.

 

[flecc]

A pleasure Caph, glad you found this ok. Hopefully the increasing number of e-bike outlets will lead to more places stocking these nuts.
.