Post #2769934
2026-04-28 10:29 UTC
Replies (3)
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@emily_s@mastodon.me.uk 2026-04-28 10:31
@concretedog@mastodon.social fair enough, good to know. I may actually have an m5 tap in that case (Shame I can't change my answer). I got a bunch of random taps in the tool boxes I inherrited from my father in law, he was a bike guy, but I'd need to break out the calipers to check.
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@geoffl@mastodon.me.uk 2026-04-28 23:58
@concretedog@mastodon.social @emily_s@mastodon.me.uk ISO standards are based on myth and superstition. There are no 13mm fine threads allowed. They go in part or whole mm steps until 18mm, then step up by larger multiples of mm from then on. But they refused to include 13mm in the spec! ISO 724 - Metric Screw Threads (fine).
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@avian@mstdn.business 2026-04-29 10:45
@concretedog@mastodon.social @emily_s@mastodon.me.uk there are 'preferred sizes', they're closer together for smaller sizes, further spaces for larger. M5 is actually the last odd number preferred size, so M5, M6, M8 and M10 etc are preferred sizes, but M7 and M9 are not. https://standards.pizy.net/thread-standards/metric-threads/iso-262/