Thumper Club Forum
Club House => Chatter => Topic started by: spooky on October 25, 2022, 06:19:26 PM
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Can someone explain in terms I might understand about metric fasteners please.... If i have a nut and bolt that a 10mm spanner/socket fits what would that be called ? M10 ? likewise if I have a bolt that needs a 13mm tool what the M is that ? I want to order a mixture but not sure where to start,
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The M refers only to the diameter of the threaded portion of the bolt. An M6 bolt might need a 10mm socket on it, for example.
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Hope this helps.
Ron.
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Even bigger bolts!
Ron.
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Thanks to you both, that`s great... :) M5/6/and 8 are what i need in stock.
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I blame the Americans who started the rot by describing fasteners by spanner size - eg 1/2" A/F which is normally for a 5/16" diameter bolt - rather than everyone else who uses the threaded siameter eg metric and BSF / Cycle etc. That chart from Ron is quite helpful. For some reason the Japanese manufacturers use different head sizes to the standard ISO ones - 12mm as opposed to 13mm for 8mm bolt diameters.
The Americans in their usual fashion, refer to their sizes as "standard".....
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Also important to note the Japanese Industry Standard (JIS) screwdriver against Phillips, as described here;
https://www.motorcycle.com/ask-mo-anything/difference-between-japanese-jis-phillips.html
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Yes indeed. I like many others must hasve ruined countless screw heads before I found this out a few years ago. My rule of thumb is: JIS will sort of work in Phillips, Phillips will work in Pozidriv. But NEVER the other way round.