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Rivnut measurement required
neilj37 - 4/8/08 at 12:35 PM

Before i go and purchase a rivnut tool and inserts and find that they will not work.
Could some kind person tell me what size hole i would need to drill to fit and M5 rivnut.

jabbahutt - 4/8/08 at 12:36 PM

I believe it's about 8mm

miikae - 4/8/08 at 12:49 PM

Just had a quick measure and they are approx 7mm dia .

Mike

[Edited on 4/8/08 by miikae]

TimC - 4/8/08 at 01:11 PM

Yes, mine were 7mm hole for 5mm bolt and and 9.8mm hole for a 6mm bolt.

worX - 4/8/08 at 01:23 PM

They differ by brand and whether they are Ribbed (for our pleasure) too though.

My straight ones are 7.1mm and ribbed are 7.2mm

Steve

John Bonnett - 4/8/08 at 03:22 PM

Hi neilj37, you can buy metric rivnuts in normal or reduced head and with metric or imperial bodies. The reduced head are good insofar as they are almost countersunkm but not all setting tools can be used with them.

If you buy the ones with metric bodies, hole sizes are as follows;
M4 6mm hole
M5 7mm hole
M6 8mm hole

Should you be unfortunate and end up with an oversize hole it's worth keeping a few of the imperial body rivnuts by as they take a slighly larger hole.

It is well woth contacted Primary Fasteners who not only supply everything in small or large quantities but they will also help with any technical information you need.

I hope this helps.

atb

John

neilj37 - 4/8/08 at 03:53 PM

Thanks for the help guys will measure the tube tonight to see if 7mm is to big a hole and if so will need to think of some other way of attaching items.

BTW this isn't car related its for a protoype i am developing for my other hobby, see attached video (not me but gives you an idea of what i do).

http://uk.youtube.com/watch?v=KLt9nBDwi9o

[Edited on 4/8/08 by neilj37]

MkIndy7 - 4/8/08 at 05:19 PM

If its going into metal and its a small thread can you not just tap the metal itself?.

Is there a measurement as to how much thread has to be engaged before it is at maximum strength and the bolt would snap rather than the thread pulling out?

I aren't a great fan of rivnuts unless they've been put in very tight as they can pull out or the opposite and spin round should the bolt ever slightly seize.

neilj37 - 4/8/08 at 05:58 PM

quote:
Originally posted by MkIndy7
If its going into metal and its a small thread can you not just tap the metal itself?.

Is there a measurement as to how much thread has to be engaged before it is at maximum strength and the bolt would snap rather than the thread pulling out?

I aren't a great fan of rivnuts unless they've been put in very tight as they can pull out or the opposite and spin round should the bolt ever slightly seize.


original attempt had the hole tapped but i stripped the threads so was looking for and alternative solution without having to do any welding

MkIndy7 - 4/8/08 at 06:10 PM

Could you put a bolt all the way through and a nut and washer or plate on the other side?

I would have thought if the part was stressed enough to pull the thread out it would do the same to a riv-nut unless the tube wall sisin't very thick.