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Water Bottle Cage Mount Screws: M4 or M5?



 
 
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  #1  
Old February 26th 10, 11:44 PM posted to rec.bicycles.tech
(PeteCresswell)
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Posts: 2,790
Default Water Bottle Cage Mount Screws: M4 or M5?

I want to order some, but can't figure out the nomenclature.

They measure just a hair under 5 mm, but take a 4mm Allen key.

So I guess they're either "m4" or "m5"... but which?
--
PeteCresswell
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  #2  
Old February 27th 10, 12:11 AM posted to rec.bicycles.tech
AMuzi
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Posts: 13,447
Default Water Bottle Cage Mount Screws: M4 or M5?

(PeteCresswell) wrote:
I want to order some, but can't figure out the nomenclature.
They measure just a hair under 5 mm, but take a 4mm Allen key.
So I guess they're either "m4" or "m5"... but which?


Machine threads measure at the OD of the thread. Less
clearance (although nominally 5mm), actual is probably 0.485mm.

DIN 985 spec for an m5x0.8 bolt is a 4mm allen drive. Most
screws will be at that standard.

Specific parts, such as the classic Shimano DOXT of the
early 1980s, may have 6mm (or 5mm) allen drive. DIN 7991 for
5mm is a 3mm allen key but Shimano SPD cleat screws use a
4mm key. These are specials, not DIN standard fasteners.

At any rate, although parts makers may choose a different
size allen drive, a special thread is virtually unknown for
fasteners today.

p.s. If you're a 'regular' at your LBS, 5mm screws are often
free for the asking.

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971
  #3  
Old February 27th 10, 12:15 AM posted to rec.bicycles.tech
AMuzi
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Posts: 13,447
Default Water Bottle Cage Mount Screws: M4 or M5?

AMuzi wrote:
(PeteCresswell) wrote:
I want to order some, but can't figure out the nomenclature.
They measure just a hair under 5 mm, but take a 4mm Allen key.
So I guess they're either "m4" or "m5"... but which?


Machine threads measure at the OD of the thread. Less clearance
(although nominally 5mm), actual is probably 0.485mm.

DIN 985 spec for an m5x0.8 bolt is a 4mm allen drive. Most screws will
be at that standard.

Specific parts, such as the classic Shimano DOXT of the early 1980s, may
have 6mm (or 5mm) allen drive. DIN 7991 for 5mm is a 3mm allen key but
Shimano SPD cleat screws use a 4mm key. These are specials, not DIN
standard fasteners.

At any rate, although parts makers may choose a different size allen
drive, a special thread is virtually unknown for fasteners today.

p.s. If you're a 'regular' at your LBS, 5mm screws are often free for
the asking.


D'oh!

First sentence should end "4.85mm".
oops

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971
  #4  
Old February 27th 10, 12:22 AM posted to rec.bicycles.tech
SMS
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Posts: 9,477
Default Water Bottle Cage Mount Screws: M4 or M5?

(PeteCresswell) wrote:
I want to order some, but can't figure out the nomenclature.

They measure just a hair under 5 mm, but take a 4mm Allen key.

So I guess they're either "m4" or "m5"... but which?


M5.

You need to order screws like that where you are? There's 5 stores near
me that sell those screws, for as little as 3 cents each.
  #5  
Old February 27th 10, 01:32 AM posted to rec.bicycles.tech
(PeteCresswell)
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Posts: 2,790
Default Water Bottle Cage Mount Screws: M4 or M5?

Per SMS:

You need to order screws like that where you are? There's 5 stores near
me that sell those screws, for as little as 3 cents each.


I want stainless - and the hardware stores around don't do metric
stainless.
--
PeteCresswell
  #6  
Old February 27th 10, 01:34 AM posted to rec.bicycles.tech
(PeteCresswell)
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Posts: 2,790
Default Water Bottle Cage Mount Screws: M4 or M5?

Per AMuzi:
First sentence should end "4.85mm".


I'm glad to hear that bc when I measured them with my new
caliper, that's what I got - instead of 5mm - and I was starting
to wonder about the device's accuracy....
--
PeteCresswell
  #7  
Old February 27th 10, 01:51 AM posted to rec.bicycles.tech
z
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Posts: 761
Default Water Bottle Cage Mount Screws: M4 or M5?

(PeteCresswell) wrote:
Per SMS:
You need to order screws like that where you are? There's 5 stores near
me that sell those screws, for as little as 3 cents each.


I want stainless - and the hardware stores around don't do metric
stainless.


Are you close to any kind of boating or marine hardware store?
  #8  
Old February 27th 10, 01:51 AM posted to rec.bicycles.tech
AMuzi
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Posts: 13,447
Default Water Bottle Cage Mount Screws: M4 or M5?

Per AMuzi:
First sentence should end "4.85mm".


(PeteCresswell) wrote:
I'm glad to hear that bc when I measured them with my new
caliper, that's what I got - instead of 5mm - and I was starting
to wonder about the device's accuracy....


If both a nut and screw were truly 5mm, you could not turn them.

Here's a typical thread guide:
http://mdmetric.com/tech/threadtech.pdf

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971
  #9  
Old February 27th 10, 01:56 AM posted to rec.bicycles.tech
(PeteCresswell)
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Posts: 2,790
Default Water Bottle Cage Mount Screws: M4 or M5?

Per z:
Are you close to any kind of boating or marine hardware store?


No - and the ones I have been to don't do hex-head cap screws.

The online suppliers seem pretty good: mind-boggling array of
sizes/grades/types and prices/shipping that beat almost any
amount of driving/wasted man hours.
--
PeteCresswell
  #10  
Old February 27th 10, 02:02 AM posted to rec.bicycles.tech
thirty-six
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Posts: 10,049
Default Water Bottle Cage Mount Screws: M4 or M5?

On 27 Feb, 00:56, "(PeteCresswell)" wrote:
Per z:

Are you close to any kind of boating or marine hardware store?


No - and the ones I have been to don't do hex-head cap screws.

The online suppliers seem pretty good: mind-boggling array of
sizes/grades/types and prices/shipping that beat almost any
amount of driving/wasted man hours.
--
PeteCresswell


Try a MC shop, a stainless hex socket panhead M5 seems likely for
fairings.
 




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