PDA

View Full Version : Rivnuts?

onedayTM
7th January 2015, 08:53 PM
This may sound daff! is it steel ones for steel and ali for ali?
cheers
alga
8th January 2015, 03:15 PM
Agreed. I've used ally ones and already I had 2-3 bolts stuck with the rivnut turning in its place.
onedayTM
8th January 2015, 10:35 PM
ok cheers for that
MikeB
9th January 2015, 01:45 PM
There a compound you can put in to stop the reaction between metals, we use to use it putting steel helicoils in to ali tank hulls. Can't remember what its called though!
flyerncle
9th January 2015, 02:15 PM
Squirt of WD40 into box section would not hurt either .
onedayTM
9th January 2015, 08:17 PM
do people use ali because they are easier to form then?
tony
skov
10th January 2015, 07:26 AM
do people use ali because they are easier to form then?
tony

Probably because they're cheaper. It is how to build a car on a budget ;)

The ali ones are sh!t though. They're quite soft and it's very easy to damage the threads in them.
I'd only use stainless if I was starting again, or even better use weld-in inserts instead.
beardydave
10th January 2015, 08:31 AM
do people use ali because they are easier to form then?
tony

Steel rivnuts over m6 are almost impossible to form with a hydraulic tool.

To limit galvanic corrosion you can use something like duralac, but its designed to go between plates rather than on a threaded insert, not sure how well it would withstand rotation whilst its drying.
voucht
10th January 2015, 12:38 PM
I used steel zinc plated rivnuts to fit the bodywork. I put a bit of Sikaflex around all of them before crimping. So they also are a bit bounded too and not only crimped (which will make them even more difficult to get loose) and I believe it makes a protection layer/sealing. The excess is easy to clean with alcohol afterwards. It cheap too.

https://farm9.staticflickr.com/8650/16058826279_fa3581d846_m.jpg (https://flic.kr/p/qt4Fza)2014-07-08_10-28-13 (https://flic.kr/p/qt4Fza) by Voucht71 (https://www.flickr.com/people/99498333@N06/), on Flickr
Ste W
13th January 2015, 11:23 PM
There a compound you can put in to stop the reaction between metals, we use to use it putting steel helicoils in to ali tank hulls. Can't remember what its called though!

Mastinox it's called. We use it in work on Eurofighters

http://www.silmid.com/products/mastinox-6856k-160ml-semco-cartridge-bms3-27-mil-p.aspx