Re: RE: Re: Past discussions

On 4/6/2025 2:50 PM, cyclintom wrote:

On Sun Apr 6 11:04:27 2025 AMuzi  wrote:

On 4/6/2025 11:01 AM, cyclintom wrote:

Remember when I said that my bike had 4 mm screws for the water bottle mount? Flunky told you all that I was lying because 5 mm was the standard for all water bottle mounts. Funny thing is that my new Time ULTeam uses 3 mm with a wide head. Perhaps Flunky can suggest why the country of the Tour de France doesn't stick to his "standard"?

>
My $5 says it's not a 3mm screw.
Remove that screw and measure it.
>
More probably a ULS or a 7991 screw, m5x0.8 with a 3mm hex
broach on the head.

    Part true, The 4 mm head was on a 4 mm screw and the 3 mm head is on a 4 mm screw. Were you correct wouldn't that mean that a 5 mm head would be on a 6 mm screw?
 

Yes, and no, and sometimes, and usually.
Depends on which format screw. DIN 912 for example:
https://www.engineersedge.com/hardware/_metric_socket_head_cap_screws_14054.htm
note column "J"
But there are a lot of other screw formats with different standard fastener broaches.
Add to that specialty fasteners, which are parts, not hardware. Shimano and Campagnolo do that a lot, for example, with m5x0.8 gear wire anchors with 5mm allen rather than standard 4mm.
--
Andrew Muzi
am@yellowjersey.org
Open every day since 1 April, 1971