Very quick query: I need a allen bolt with a 4mm socket with 10mm of thread and just need to check it is a M4x10 that i order.
Mucho thanks
Bike Forum
[closed]
Metric bolt sizing.
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Posted 3 years ago #
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no.
m4 relates to the diameter of the thread - somewhat unrelated the the allen key size.
HTH
Posted 3 years ago # -
4mm hex will be a M5 bolt
Posted 3 years ago # -
Sounds like m6x10 bolt you req (also you may need to check thread pitch?)
Posted 3 years ago # -
What's it for? Most bolts on bikes are M6, but often a bolt with a 4mm head will be an M5.
Posted 3 years ago # -
You need to measure the thread diameter. a 4 mm thread diameter is M4. 4 mm allen socket head is probably M6 but not always
Almost all metric bolts are the same thread although there are two sizes - fine and normal
Posted 3 years ago # -
Yay!
4mm diameter metric, so M4 x10.
2 lovely (!) new Ti bolts courtesy of local fastener companyPosted 3 years ago #
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