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Discussion Starter · #1 · (Edited)
Random one gents. (And ladies 😉)
What is the bolt (M8 etc) and thread on the base of the handle bar/speedo on my Night Rod Special? Thank you in advance
 

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M10 (diameter) x 1.5mm (thread pitch). Length? Dunno.

Metric Thread Pitch
bolt thread pitch


As noted, the specification of metric bolts includes the definition of thread pitch, but if this is omitted then a coarse pitch is assumed. Metric fasteners are available with either coarse or fine thread pitches with some metric bolt sizes offering extra fine thread pitch options. It is worth noting that metric bolts with a coarse thread pitch have more threads per inch (they are more closely spaced) than comparable imperial bolts.

List of common metric bolt sizes.
Metric CoarseMetric FineMetric Extra Fine
M1.4-0.3
M2-0.4
M2.5-0.45
M3-0.5
M3.5-0.6
M4-0.7
M5-0.8
M6-1.0
M7-1.0
M8-1.25M8-1.0
M10-1.5M10-1.25M10-1.0
M12-1.75M12-1.5M12-1.25
M14-2.0M14-1.5
M16-2.0M16-1.5
M18-2.5M18-1.5
M20-2.5M20-1.5
M22-2.5
M24-3.0M24-2.0
M30-3.5
M36-4.0
 
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