Mister Paul 838 Posted September 22, 2018 Share Posted September 22, 2018 I'm fitting an adjuster and a GPS bar to my CB500X screen bracket. I need longer bolts than those that fix the screen bracket to the bike. But I'm not great at the M business. These have 10mm long thread, and the thread diameter looks to be 5mm. What have I got? Link to post
Andy m 23,633 Posted September 22, 2018 Share Posted September 22, 2018 M5 x 0.5 10mm long by the sound of if. Andy 1 Link to post
Mister Paul 838 Posted September 22, 2018 Author Share Posted September 22, 2018 11 minutes ago, Andy m said: M5 x 0.5 10mm long by the sound of if. Andy Thanks Andy. What does the 0.5 stand for? Link to post
Andy m 23,633 Posted September 22, 2018 Share Posted September 22, 2018 It's the pitch, how far the peaks are from each other. On small threads there is no real variation unless you deal with watchmakers or Russians. On say M12 there is 1.0, 1.25, 1.5 etc, fine to course. You will meet the fine where the forces really need a bigger bolt but it won't fit. A fine in a course hole will jam about half a thread in. Andy 1 Link to post
8ace 104 Posted September 22, 2018 Share Posted September 22, 2018 Without seeing the bolt it'll be a bit tricky to guess the size. If it's about 5mm diameter then chances it'll be an metric M5 thread, the next dimension is the pitch. The usual M5 thread pitch size is 0.8 but it could be a fine pitch 0.5. Here is a site that explains the measurements. https://specbolt.com/technical.html Martin 1 Link to post
MikeBike 5,006 Posted September 23, 2018 Share Posted September 23, 2018 (edited) If you look up your bike on a parts website, it often gives the spec of the bolt concerned. e.g. https://www.fowlersparts.co.uk/parts/6577359/cb500xa/upper-coverwindscreen e.g. if it's part 16 it's Pan Head M6 x 10 (CX500A 2018 may not be your bike, please check model selected) Edited September 23, 2018 by MikeBike Link to post
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