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Post by jonb2010 on Nov 30, 2011 22:17:14 GMT
I've been looking at different Rivnut tools and I think I'll be going for one of these from memfast. memfast.co.uk/shop/Vprod2.asp?cat=3730001036I'm not sure which rivnuts to actually buy though. What depth and material? I was thinking of fixing part of the firewall with rivnuts so I can get access through it if I want to. The other uses I haven't got a clue so I want to cover most eventualities. I'm using stainless steel bolts where I can so I presume I want to use SS rivnuts ? Any advice ?
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Post by daydreamer on Nov 30, 2011 23:45:35 GMT
I have the same one and it is a pleasure to use. For rivnuts I have used ss bolts but the rivnuts have been plain steel with a "zinc and yellow passivate" finish. I initially wanted to use ss rivnuts but the cost and lead time for ordering put me off. The plain steel with zinc finish are stock items and much cheaper. I was paying M4 £4.00 per 100 M6 £5.00 per 100 M8 £7.50 per 100 all plus vat and postage. RE which rivnuts. There is a lot of choice. I have ordered these and found them to work well in the chassis and all the alu sheets I have used. www.rivetnut.co.uk/Pdf/KTOS-S%20DATA%20SHEET.pdfThese are not a flush fitmet, they do stand about 0.5 mm proud of the surface. Regarding the rivnut tool be aware that the mandrels are consumable items and in the case of the M4 fitment , very easily broken. I have broken 3 of the M4 mandrels. OK, I've fitted about 200 m4 rivnuts and around 80 M6 rivnuts. So far no breakages with the M6 and M8 mandrels. If your going to use the M4 rivnuts then consider ordering a spare m4 mandrel. memfast.co.uk/shop/Vprod1.asp?cat=3944005107I have on a few occasions messed up the Rivnut fitment and it has not gripped the sheet or chassis it was fitted to so it just turns in the sheet. On some occasions this was because of a crossed thread when fitting the bolt. If you try pulling it out it makes a royal mess of the sheet it is fitted to. In this case I had to drill it out and refit with a larger rivnut and bolt. If your bolt does not go into the rivnut reasonably freely, don't force it, try cleaning the threads in the rivnut with a suitable tap. The rivnuts are a relatively soft material by design and can get out of shape. I've used rivnuts in lots of brackets where a captive nut is handy. If you do this then I suggest you use threadlock when you fit the bolt or it may vibrate lose.
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realtwin
Junior
Sonic 7 builder
Posts: 40
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Post by realtwin on Jan 18, 2012 12:32:46 GMT
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Post by pete on Jan 21, 2012 20:13:18 GMT
hi i have trouble with the memfast on smaler nuts they turn in the hole. end up up unscrewing tool and using a normall nut and bolt method allways works just fidely good for tight spots as well where tool wont fit.Pete'
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