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Help finding pedal locknut

Old 05-24-17, 01:09 PM
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Seizedpost
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Help finding pedal locknut

Hello all,
The local hardware store has failed to help me. I'm getting desperate.
I stripped a pedal locknut on my 1959 Maino. The old pedals measure as standard thread, they look like standard thread, and I can manage to get a standard pedal on the drive side, but can't quite coax one onto the NDS. I am riding with mismatched pedals.

The nut fits into a 7/16" wrench. It threads onto an M7 x 1.0 bolt, but an M7 x 1.0 nut does not fit the spindle. I measured the length of five threads on the spindle, peak to peak, and as near as I can tell it's around 4.4mm, making each thread .88mm, or around 29 tpi. The pedal spindle's diameter is just a hair under 7mm.
Has anyone seen a pedal like this?



Worst case, it should be easy enough to retap the crank and get any old pedals, but I need one nut! This shouldn't be so hard.
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Old 05-24-17, 01:16 PM
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Mixed Imperial/Metric world out there .. pedal flats are 15mm on 9/16x20tpi pedals , unless its French,
then its 14mm thread

I just see a complete pedal. not missing anything.. remember 1 of the pedals is left hand thread, the other right hand.
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Old 05-24-17, 01:24 PM
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Word salad. Can't tell if this is about the outer cone locknut, or about the pedal/crank interface, or something else.
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Old 05-24-17, 01:25 PM
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The problem is the locknut that holds the bearing cone in place. Would it help if I posted a picture of that? It's just a little thin nut.
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Old 05-24-17, 02:20 PM
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Originally Posted by Seizedpost View Post
The problem is the locknut that holds the bearing cone in place. Would it help if I posted a picture of that? It's just a little thin nut.
Then why would you not be able to fit the pedal to the crank if it's an internal pedal part?
Your post is very confusing.
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Old 05-24-17, 02:27 PM
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if i had a bolt and i wanted to buy a nut that fitted it, i would take the bolt (the pedal axle) to the hardware store or LBS and find a nut that fitted it.

if in the event i couldn't find a nut that fitted it, i would look for a new bolt (the pedal axle, or a pedal in this case) that could serve as a substitute.
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Old 05-24-17, 02:44 PM
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The threads on the spindle, where it attaches to the crank, are very slightly differnet from modern standard ones. This is not my main issue. It is an unnecessary detail that I should have omitted.

This is my main issue, let me start over.

I stripped a pedal locknut (the nut that keeps the bearing cone from moving) on my 1959 Maino.

The nut fits into a 7/16" wrench. It threads onto an M7 x 1.0 bolt, but an M7 x 1.0 nut does not fit the spindle. I measured the length of five threads on the spindle, peak to peak, and as near as I can tell it's around 4.4mm, making each thread .88mm, or around 29 tpi. The pedal spindle's diameter is just a hair under 7mm.
I want to replace this locknut.
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Old 05-24-17, 02:54 PM
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Are you sure that the spindle (from 1959) uses metric threads? Have you tried the next closest inch sized nut?
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Old 05-24-17, 03:16 PM
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Try 1/4-28.
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Old 05-24-17, 03:20 PM
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I am GUESSING that the thread is 9/32 - 32

https://www.mscdirect.com/product/details/04840914

You may have to make your own locknut. I'd start with a thin #10/32 or M5 nut, drill it out, then tap.

Hopefully it is 1/4-28 as Bill suggests.
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Old 05-24-17, 03:59 PM
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The thread could be 7mm x 0.75; that's what other Italian pedals have used, e.g. Campagnolo, Gipiemme, Ofmega, etc.
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Old 05-24-17, 05:49 PM
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Just a guess: Is the nut for the NDS pedal left hand threaded. Never saw this but I reckon it's possible.
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Old 05-24-17, 05:55 PM
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No, the cones and locknuts are all right hand threaded. Only the threads where it attaches to the crank on the nds are left threaded.

Before I place an online order, does anyone have an extra M7 x .75 nut they could put in an envelope and send me? I can send payment through Paypal.
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Old 05-24-17, 06:30 PM
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with a bike that old the size could be incompatible with any readily available modern sizes.

i would look elsewhere on the bike for a similar sized nut. maybe you'll get lucky and find one that could be sacrificed.

i had some old Whitworth nuts and bolts on my '61 MGA.
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Old 05-24-17, 08:31 PM
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Is there a machine shop (or auto parts store?) that has a thread gauge you can use?
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Old 05-24-17, 08:50 PM
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Originally Posted by Bill Kapaun View Post
Try 1/4-28.
Agree.

The wrench would be 7/16 (which would point to a 1/4 bolt), or it could be 11 mm which is ~6.9/16ths, which would point to a 7mm bolt. 7mm is not a metric standard (there is a DIN standard for a 7mm bolt, but ISO and JIS don't list it if I'm reading the right tables). So this points to a 1/4" thread.

If the major diameter is just under 7mm (which is 0.2756"), it sounds like a 1/4"
And while 28 tpi is close to 25.4 tpi (1mm thread), it's even closer to the 29tpi you measured.

And 1/4-28 is a standard nut size: UNF.
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Old 05-25-17, 08:05 AM
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My MKS 'Dutch' pedals have a reflector in the rubber blocks , and can be serviced and adjusted .

I added to the factory grease , and re adjusted them when I got them, new.

.... in replacement, function, it's 'Like that'..





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Old 05-25-17, 08:20 AM
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Originally Posted by WizardOfBoz View Post
Agree.

The wrench would be 7/16 (which would point to a 1/4 bolt), or it could be 11 mm which is ~6.9/16ths, which would point to a 7mm bolt. 7mm is not a metric standard (there is a DIN standard for a 7mm bolt, but ISO and JIS don't list it if I'm reading the right tables). So this points to a 1/4" thread.

If the major diameter is just under 7mm (which is 0.2756"), it sounds like a 1/4"
And while 28 tpi is close to 25.4 tpi (1mm thread), it's even closer to the 29tpi you measured.

And 1/4-28 is a standard nut size: UNF.
I don't know if it's a "standard", but my thread gauge set has a 7x1.0mm thread.
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Old 05-25-17, 08:36 AM
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Bill, I had never run across an M7, and on the one chart I looked at it was listed under DIN, but not ISO or JIS standards. I looked at a few other charts, and it appears there are both coarse (1mm) and fine (.75mm) pitches in 7mm. Can't find the chart I was looking at now, of course. M6 and M8 are way more common I think.

In any case, I think you were right: this is likely a 1/4-28 thread. Be interested to hear back.
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Old 05-25-17, 11:30 AM
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Originally Posted by fietsbob View Post
My MKS 'Dutch' pedals have a reflector in the rubber blocks , and can be serviced and adjusted .

I added to the factory grease , and re adjusted them when I got them, new.

.... in replacement, function, it's 'Like that'..
:
As I stated earlier, much to everyone's confusion, the threads on the pedals I am trying to repair are very slightly different from standard. I would need to retap the threads in my crank to replace them. It's looking like that would be easier than replacing this nut though.
Would the outside diameter of an M7 x .75 bolt be the same as an M7 x 1 bolt? The pedal spindle has a slightly larger diameter than the M7 x 1.0 bolt I compared it to.
It is definitely not 1/4-28, the pedal spindle's OD is larger than the 1/4-28 bolt I compared it with.
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Old 05-25-17, 12:22 PM
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Originally Posted by WizardOfBoz View Post
Bill, I had never run across an M7, and on the one chart I looked at it was listed under DIN, but not ISO or JIS standards. I looked at a few other charts, and it appears there are both coarse (1mm) and fine (.75mm) pitches in 7mm. Can't find the chart I was looking at now, of course. M6 and M8 are way more common I think.

In any case, I think you were right: this is likely a 1/4-28 thread. Be interested to hear back.
I was a bit surprised there was a 7mm. I have no idea if it's "standard", but apparently common enough to put on a thread gauge that seems to be missing a couple sizes I would consider "more standard".
BTW- A 5x.8mm seems extremely close to a 10-32.
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Old 05-25-17, 03:04 PM
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I got a 5/16-24 nut to work. I had to force it a little, it isn't the correct size, but it fits. I don't feel great about doing it wrong, but at least it's fixed.
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Old 05-25-17, 03:15 PM
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On this side of the Atlantic, M7 and M9 are extremely rare sizes. Also, the pitch would be either .75, .8, or 1.0. Somebody with a pitch micrometer and an optical comparater (as well as a thread/pitch guide) could tell you what you have. On the Imperial side, .88 mmpt is really close to 28 tpi.
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Old 05-25-17, 03:55 PM
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Not to derail the thread, but CitroŽn has used 7 x 1 bolts and nuts in their cars for years.
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Old 05-25-17, 05:20 PM
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Originally Posted by Reynolds View Post
Not to derail the thread, but CitroŽn has used 7 x 1 bolts and nuts in their cars for years.
Figures. They used to make wheels with no center hole, as well. BTW, I think that a year or 2 passes between Citroen sightings where I live.
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