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Socket Cap Head Screws

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fbg40 | 12:45 Tue 15th Oct 2019 | Home & Garden
8 Answers
Quick question for all you mechanics out there - is there an easy way to tell what gauge a socket cap head screw is please ? I need to replace 4 and cannot tell whether they are M6, M10 or whatever. Any help would be greatly appreciated. Just for info, the head diameter is 10mm.
FBG40
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>>> the head diameter is 10mm

As I read this, that means that it's M10:
https://www.quora.com/How-do-you-differentiate-between-M8-M10-and-M12-bolts
M10 is the thread size, approx. 10mm diameter, so the head will be larger. Can you not remove one and measure the shank diameter?
Question Author
Thanks for the quick response folks, will have to measure the shank diameter.
FBG40
IIRC , an M10 bolt requires a 13mm socket and a M6 bolt requires a 10mm socket...but I could be wrong!!
Right enough .. the thread diameter is determined by the number following 'M'.
Every day of the week I use M6 socket cap head screws and the are tightened and slackened using a 6mm hexagon wrench .. not a socket in sight!
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Thanks again for the info - much appreciated.
FBG40
They're probably M6 but you'll need to measure the diameter of the thread. M6 is slightly less than 6mm diameter
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Johnk
Measured as you suggested, just about 6mm. Thanks for your help.
FBG40

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