Rivnuts

[Chassis 33]

Folks, have you tried Rivnuts in glass fibre? Do they work or do they just pull through?
Regards
Iain

[Graham]

You get the odd one pull through if you set the crush height wrong or the grp is very thin, but i've used them a lot with good results

[teamHOLDENracing]

Depends on the application, what you are securing and how often you need to access it.

Rivnuts are ok, but I often have to replace the ali ones because the threads are easy to damage, or you get a bit of corrosion and the bolt seizes in them, causing the rivnut to rotate and not undo.

Captive or floating nuts are more reliable and secure, but more expensive. The floating ones are great as it gives you a bit of leeway in lining everything up

Edited by teamHOLDENracing on Wednesday 6th October 14:00

[wedgefettler]

Iain, make sure that you put copper slip on the bolts before you put them in, to stop them seizing ( as Andy indicated )
and don't overtighten them !!!

[Chassis 33]

Thanks for the input chaps. Pretty much eveything I thread gets a dose of copper grease (and more often than not a spring washer, or Snore in particularly critical areas), unless there is a good reason not to!

Regards
Iain

[teamHOLDENracing]

When you solid mount your engine and gearbox you tend to threadlock everything. At which point the ali rivnut isn't really an option anymore.

The captive anchor nut that you attach to panels with two small rivets, the pictures of which didn't appear, are self locking and don't vibrate free. All my honeycomb floors are attached with them and I've not had a single bolt come undone.

[Chassis 33]

Cheers Andy Only thinking of holdng on panels or small ancillaries like header tanks.

Just off at a tangent, do you have any issues with aluminium blocks and gearbox casings cracking when solid mounted?
Regards
Iain

[Neil_S]

Chassis 33 said:

Cheers Andy Only thinking of holdng on panels or small ancillaries like header tanks.

Just off at a tangent, do you have any issues with aluminium blocks and gearbox casings cracking when solid mounted?
Regards
Iain

My chevy block is ally and load bearing but it's a spread rail block and so beefier than normal. No problems so far

[heightswitch]

Chassis 33 said:

Folks, have you tried Rivnuts in glass fibre? Do they work or do they just pull through?
Regards
Iain

Use a washer on the back of the rivnut so that the nut crimps against the washer on the rearsurface of the panel. Then you won't have any pull through issues. You will need to get someone to keep the washer flat against the inner surface of the panel though.

N

[Chassis 33]

Good call, thanks Niel.
Regards
Iain