MadModder
Gallery, Projects and General => How do I?? => Topic started by: AdeV on November 19, 2011, 11:12:37 AM
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What size hole do I need to drill to clear the head of an M10 cap head bolt? I'm drilling into the under section of my sump, and I want to countersink the bolts nice & deep, so they don't get in the way of anything, and to reduce the temptation to remove them... (I may plug the holes once the bolts are in)
Thing is, I don't have any M10 cap-head bolts yet... & can't get any until Monday, so I can't measure myself...
Thanks in advance! :nrocks:
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Solidworks uses a 10.0mm diameter hole, by 18.0mm deep as standard clearance for a 10mm S.H.C.S.
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AdeV,
I measure with my trusty calipers, the head is 16.12 mm dia by 9.90mm high..
HTH
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Best to measure your screws as they do vary from the proper BS spec as you can see by comparing your sizes with the following.
http://www.roymech.co.uk/Useful_Tables/Screws/cap_screws.htm
J
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There's a table here, Ade, which indicates that a 16mm dia x 10mm deep counterbore should be OK for M10. If the bolt heads are a mite too big when you get them, you could always turn them down to fit.
Andy
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Excellent, thanks chaps. I'll make the holes 16mm for now & either enlarge them or turn down the bolts if they won't fit.
Look out for some sump progress tonight :)
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Well, looking out for flying sumps, nothing here yet Ade. Still its only 6.45, time yet. :lol: :lol: :lol:
Bill
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G-Wizard says 17.5x10 countersink. Head diameter is 16.
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So is this bolt a countersunk head or is it a standard cap head that requires a counterbore ?
Gone to get me kevlar armour....
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Um, I suspect you're right John, I need a counterbore to hold the cap-head of the bolt...
Damn these pesky machining terms. Look, I need a hole, that's big enough for the head to go into, but not all the way through.... the upright section is drilled 10mm clearance, the sump itself is drilled 8.5mm tapping (& then tapped m10) to take the cap-head bolt, that.... you get the picture...
Anyway, a new sump post will be coming right up... just got to fettle the pictures & write the text.
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Um, I suspect you're right John, I need a counterbore to hold the cap-head of the bolt...
you get the picture...
In that case my previous post provides the dimensions....... :thumbup:
Sorry for being so picky....
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John, your cap-head bolts measured exactly the same as mine: 16.12mm...
Predictably, my 16mm milling cutter cut a dead accurate 16mm hole... so the heads wouldn't fit. Rather than adjust the main sump, I just turned a few thou off each cap head (as suggested by Andy) so it fitted nicely, job done! I should probably put some kind of rust-proofing on it, if I can be bothered...