Bolt pitch/diameter

Phil said:

What pitch and diameter are the bolts that clamp down most ATB brake levers on the handlebar?

5 x .8 mm (a.k.a. "M5"😉 or 6 x 1 mm (a.k.a. "M6"😉

These two thread sizes are used for most fasteners on modern bikes.

M5 is quite close to #10-32, sometimes interchangeable.

Sheldon "Metric" Brown +----------------------------------------------+
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"Sheldon Brown" <[email hidden]> escreveu na mensagem
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Quoted message said:

Phil said:

What pitch and diameter are the bolts that clamp down most ATB brake

levers

Quoted message said:

Quoted message said:

on the handlebar?

5 x .8 mm (a.k.a. "M5"😉 or 6 x 1 mm (a.k.a. "M6"😉

These two thread sizes are used for most fasteners on modern bikes.

M5 is quite close to #10-32, sometimes interchangeable.

Sheldon "Metric" Brown

You'll find metric threads (M6) also in the cantilever pivots, v-brake shoes, stem bolts,
pre-tensioning bolt of the threadless headsets, front derailler clamp and its own cable clamp... All
of these bolts uses a 5 mm Allen wrench.

The same allen wrench is used to loosen/tighten another metric bolt, the rear derailler retainer,
but this bolt is a 10M1 (10 mm diameter x 1 mm pitch).

[]'s Eduardo
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Sheldon said, "M5 is quite close to #10-32, sometimes interchangeable."

Basically, this is correct but, with all due respect to Mr Brown, your chances of getting a #10 x 32
into a 5mm is greater than your chances of getting the 5mm into the #10 x 32.

The nominal size of the #10 bolt is .187" and the 5mm bolt is .197"

--
Lewis.

.........................

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"Sheldon Brown" <[email hidden]> wrote in message
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Quoted message said:

Phil said:

What pitch and diameter are the bolts that clamp down most ATB brake

levers

Quoted message said:

Quoted message said:

on the handlebar?

5 x .8 mm (a.k.a. "M5"😉 or 6 x 1 mm (a.k.a. "M6"😉

These two thread sizes are used for most fasteners on modern bikes.

M5 is quite close to #10-32, sometimes interchangeable.

Sheldon "Metric" Brown +----------------------------------------------+
| Certainly the game is rigged. | Don't let that stop you; | if you don't bet, you can't win.
| | --Robert A. Heinlein |
+----------------------------------------------+ Harris Cyclery, West Newton, Massachusetts Phone
617-244-9772 FAX 617-244-1041 harriscyclery.comharriscyclery.comOpen ↗ Hard-to-find parts shipped Worldwide
captainbike.comcaptainbike.comOpen ↗ sheldonbrown.comsheldonbrown.comOpen ↗

Quoted message said:

The nominal size of the #10 bolt is .187" and the 5mm bolt is .197"

Thanks all - I'm doing a CAD project: bike map holder mounted on the handlebars. I really don't care
about it at all, but I needed something to do, and bikes are of course at the top of my list. Maybe
I'll post my results when I'm done (later today).

--
Phil, Squid-in-Training

Sheldon Brown said:

M5 is quite close to #10-32, sometimes interchangeable.

In fact, you could think of the #10-32 as metric 4.826x0.794 if you wanted to.

The 4mm (.1575"😉 or 5/32" (.1563) hex keys used for socket head cap screws of these sizes are
much more interchangeable than the screws themselves-- identical within manufacturing
tolerances, in fact.

I used to make homebrew bike parts with #10-32 and 3/8"-16 socket head screws and 1/4"-20 flat head
screws so that I could use metric hex keys but machine with cheaper, better quality inch-sized taps.

Chalo Colina

Sheldon Brown may have said:

M5 is quite close to #10-32, sometimes interchangeable.

Expanding:

M5 nut on 10-32 bolt: works, may strip the bolt if overtorqued a tad.

Short 10-32 screw in M5 hole: often works.

10-32 nut on M5 bolt: if it's a sleazy cheapo crapola quality nut, it'll go right on Good 10-32 nuts
will start, and then make you wonder why it doesn't quite fit, and then if the bolt's a 5.x grade or
less, the bolt will often snap or strip.

M5 bolt in 10-32 threaded hole: Probably not a good move. May cause vocabulary expansion.

To make matters worse, the typical M5 nut uses an 8mm wrench, and *some* 10-32 nuts use a 5/16"
wrench, which is just .003" smaller; these two are infuriatingly easy to get mixed up.

In performing repairs, the two sizes as matched assemblies more often than not can be freely
swapped, since the typical US-made part that was sized for a 10-32 bolt will have been drilled
larger than is needed for even the slightly fatter M5. European and Japanese machining always did
seem to favor greater precision than that used in American consumer-level goods.

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contains nuts.

#10 bolt basic size is .196", but the pitch is ,799mm (converted from
32 threads per inch). M5 pitch is .75mm. A short nut or thread length will probably work but a long
thread will bind up.

Tom

Lewis Campbell said:

Sheldon said, "M5 is quite close to #10-32, sometimes interchangeable."

Basically, this is correct but, with all due respect to Mr Brown, your chances of getting a #10 x
32 into a 5mm is greater than your chances of getting the 5mm into the #10 x 32.

The nominal size of the #10 bolt is .187" and the 5mm bolt is .197"

--
Lewis.

.........................

*******************************

"Sheldon Brown" <[email hidden]> wrote in message
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Quoted message said:

Phil said:

What pitch and diameter are the bolts that clamp down most ATB brake

levers

Quoted message said:

Quoted message said:

on the handlebar?

5 x .8 mm (a.k.a. "M5"😉 or 6 x 1 mm (a.k.a. "M6"😉

These two thread sizes are used for most fasteners on modern bikes.

M5 is quite close to #10-32, sometimes interchangeable.

Sheldon "Metric" Brown +----------------------------------------------+
| Certainly the game is rigged. | Don't let that stop you; | if you don't bet, you can't
| win. | --Robert A. Heinlein |
+----------------------------------------------+ Harris Cyclery, West Newton, Massachusetts Phone
617-244-9772 FAX 617-244-1041 harriscyclery.comharriscyclery.comOpen ↗ Hard-to-find parts shipped Worldwide
captainbike.comcaptainbike.comOpen ↗ sheldonbrown.comsheldonbrown.comOpen ↗

Quoted message said:

Quoted message said:

Quoted message said:

Phil, Squid-in-Training wrote:
>What pitch and diameter are the bolts that clamp down

most ATB brake levers

Quoted message said:

>on the handlebar?

Quoted message said:

Quoted message said:

"Sheldon Brown" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

5 x .8 mm (a.k.a. "M5"😉 or 6 x 1 mm (a.k.a. "M6"😉 These two thread sizes are used for most
fasteners on modern bikes. M5 is quite close to #10-32, sometimes interchangeable.

Tom Schneider said:

#10 bolt basic size is .196", but the pitch is ,799mm

(converted from

Quoted message said:

32 threads per inch). M5 pitch is .75mm. A short nut or thread length will probably work but a

long thread will

Quoted message said:

bind up.

Sheldon knows. The standard metric m5 fastener, certainly for bicycle parts, is 0.8. Pretty close to
0.799! The French version, m5x0.9 is virtually obsolete.

--
Andrew Muzi www.yellowjersey.org Open every day since 1 April, 1971

A Muzi said:

Quoted message said:

Quoted message said:

>Phil, Squid-in-Training wrote:
>>What pitch and diameter are the bolts that clamp down
most ATB brake levers
>>on the handlebar?

Quoted message said:

Quoted message said:

"Sheldon Brown" <[email hidden]> wrote in message
"]news:[email hidden]...

> 5 x .8 mm (a.k.a. "M5"😉 or 6 x 1 mm (a.k.a. "M6"😉 These two thread sizes are used for most
> fasteners on modern bikes. M5 is quite close to #10-32, sometimes interchangeable.

Tom Schneider said:

#10 bolt basic size is .196", but the pitch is ,799mm (converted from
32 threads per inch). M5 pitch is .75mm. A short nut or thread length will probably work but a
long thread will bind up.

Sheldon knows. The standard metric m5 fastener, certainly for bicycle parts, is 0.8. Pretty close
to 0.799! The French version, m5x0.9 is virtually obsolete.

Right about the 0.8, but the 0.799 is slightly off, it's 0.79375 or about 0.794. Still pretty close.
Another way of looking at it is that the M5 is 31.75 tpi.

Dave Lehnen

Dave Lehnen said:

Right about the 0.8, but the 0.799 is slightly off, it's 0.79375 or about 0.794. Still pretty
close. Another way of looking at it is that the M5 is 31.75 tpi.

Less evident, is that only one thread is bearing any load in such a combination, and if there is any
stress that one thread will yield leaving the joint loose. By giving it a high tightening torque,
yield will occur immediately but then the screw won't turn freely when unscrewing it.

It's not a good method even if it does go together more or less freely.

Jobst Brandt [email hidden]