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I am working on a project that requires:

3pcs M5x30-50 bolts and nuts

I assume the M5-30 is the size and length. What is the 50 specify?

Tony Giaccone
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2 Answers2

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I think your project instructions left out the thread pitch because M5 bolts and nuts come only in 0.8mm pitch in ordinary commerce. So in my opinion, the project calls for:

M5-0.8 bolts that are any length between 30 and 50 mm long

MTA
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2

I'm assuming you know how bolt threads work, are measured, and are cut.

M5 means the nominal diameter of the machine screw.

x30 is nonsensical. It sounds like someone is trying to say "30 threads per inch" as SAE fasteners are specified... but that is absurd in a metric fastener. However, 1/30 of an inch is very close to 0.8mm, and that is the most common thread pitch for M5.

-50 means the length of the bolt is 50mm (about 2 inches).

Harper - Reinstate Monica
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