Finding Unified rivnuts

[old martParticipant @oldmart]

Metric rivnuts are easy to get hold of in the UK, but I have been asked about unified ones in the sizes under 1/4″. There are plenty on ebay from the USA with the added large postal charges. I am making an 8-32 UNC adaptor for the tool used for metric ones.

[Michael GilliganParticipant @michaelgilligan61133]

Any use ?

https://www.rays-teksurplus.co.uk/100-x-8-32-unc-blind-rivet-nuts-aluminium-rivnuts-length-1116-nas1329a08b75-n6-17568-p.asp

MichaelG.

[Robert Atkinson 2Participant @robertatkinson2]

You can get aerospace ones in the UK. Specification is NAS1329A Suppliers:

https://www.airpart.co.uk/page/aircraft-hardware-suppliers-rivnuts

https://www.lasaero.com/parts/?search_part=NAS1329A&search_type=part

https://www.adamsaviation.com/products/airframe-parts-and-accessories/247192rivnut

Robert.

[peak4Participant @peak4]

Here, but not cheap
https://memfast.co.uk/shop/Vprod2.asp?cat=6138003649

Reduced Csk Head, Plain Body Rivet Nut, Imperial Hole Size, Steel Zinc

mixed sets
https://www.ebay.co.uk/itm/364472765527

Bill

 

[Howard LewisParticipant @howardlewis46836]

If the worst comes to the worst, you could make them!

(I had to when given an otherwise nice roller cabinet, with damaged M6 fixings for the handle)

Howard

 

[peak4Participant @peak4]

No idea why the Amazon link now displays as above; it was OK when I posted it.

Box of mixed imperial “Rivnuts” HERE, but only 3 left apparently

Bill

[old martParticipant @oldmart]

When Howard mentioned making them, it caused me to compare thread sizes, and tomorrow I will look at the 3mm ones. That thread is 0.1181″ and 8-32 is 0.164″. 4mm would probably be too large to retap. I very much doubt if 3.5mm rivnuts exist. Roger is going to try the local suppliers, but there is not so much demand for unified nowerdays.

I think he wanted at least 200

[old mart]

On old mart Said:

I think he wanted at least 200

Well, the ones that I linked were £9.99 for 100

[ but they’re probably the wrong colour ]

MichaelG.

[old martParticipant @oldmart]

I did consider those blind ones, but would have to confer with Roger regarding the length, 11/16″ is very long for such small rivets.

[old martParticipant @oldmart]

The 3mm are too small to tap out to 8-32, and the 4mm are too large. The 4mm aluminium ones strip the threads 4 times out of five.

[old martParticipant @oldmart]

Last Thursday, Roger ordered some 8-32 aluminium rivnuts from China and yesterday (Wednesday), he brought them in. That was pretty quick delivery. I made a tool for the rivnuts out of some hex steel bar, but it showed some distress while testing the 8-32 thread. I made another out of a 1/2″ aircraft bolt, that should be a lot stronger.

[Nigel Graham 2Participant @nigelgraham2]

Looking at Normandy Fasteners’ web-site I see they offer what I had always known as “hank bushes” – the hexagonal bushes fitted from the rear of the panel by expanding the shank, itself countersunk like a union nut, into a countersink on the outer face.

Once installed, and especially after painting, they are indistinguishable from plain nuts and I can think of many uses in model-engineering, so I am surprised our suppliers seem never to have heard of them.

[Author]

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