Wildguzzi.com
General Category => General Discussion => Topic started by: tris on February 25, 2016, 04:56:32 AM
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Morning all
I'm trying to track some 12 point flanged lock nuts down and our engineering department want to know the ISO/ASME/BS/DIN standard that applies.
I'm struggling though as I suspect that they are propriety items and aren't made to an international standard.
So what to you aerospace types call these please
(http://i1149.photobucket.com/albums/o593/tris51/12%20point%20nut%201_1.jpg) (http://s1149.photobucket.com/user/tris51/media/12%20point%20nut%201_1.jpg.html)
(http://i1149.photobucket.com/albums/o593/tris51/12%20point%20nut%202.jpg) (http://s1149.photobucket.com/user/tris51/media/12%20point%20nut%202.jpg.html)
Cheers
Tris
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McMaster-Carr has them listed as "High-Torque 12-Point Flange Nuts" available in crome-moly or A286 stainless. They don't however list engineering specs for these nuts, as they do some others. Give them a call, 404 346 7000, and they can probably come up with a manufac. spec. sheet. Good luck.
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I've seen them on helicopters in high temp areas, but I don't know what they're called, either.
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CM
Cheers I'll take a look but if they're not showing a spec could be because there isn't one!!
PS
I'm based in the UK so don't use McMaster - could you shoot a linky over please?
CinI
That'll be them.
We use the to hold the top and bottom halves of an industrial gas turbine together - so hot too!
Somebody will know what they called
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CM
Cheers I'll take a look but if they're not showing a spec could be because there isn't one!!
PS
I'm based in the UK so don't use McMaster - could you shoot a linky over please?
CinI
That'll be them.
We use the to hold the top and bottom halves of an industrial gas turbine together - so hot too!
Somebody will know what they called
http://www.mcmaster.com/#
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I like McMaster Carr - we don't have anything close to that over here :cry
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We always called them jet nuts or heat nuts. Try Rolls Royce, they should have published specs. Pratt&Whitney too. They may not be real forthcoming on the specs, being proprietary but maybe an aftermarket aviation supply will say if an item meets specs, they should be able to furnish those.
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Looks like clubman nailed it:
Here is a PDF with info and website info:
http://www.afsrsimmonds.net/pdf/M3k6913_Flier_DHE_Final.pdf (http://www.afsrsimmonds.net/pdf/M3k6913_Flier_DHE_Final.pdf)
They're in France though I think.
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Groover nailed it!
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We always called them jet nuts. Used them a lot on the race car. Many racing suppliers (pegasus an such) will stock them at a fair price and may have specs avail.
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Groover nailed it!
YEP - Groover nailed it. :bow: :bow: :bow: :bow:
I knew of Simmonds but hadn't found that spec and specifically ISO 8788-2000 Annex E
All personnel may now stand down and thanks for all your input
Tris
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I can't take any of this credit! All I did was Google what Clubman defined as the name of the nut, so Clubman gets the points!
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Looks like the NAS 1804 series similar to what the old Hillers had holding a lot of their transmission component together
I think the 12 point is referred to as "double hexagon". Handy little nuts they are space wise. Solve a lot of tight engineering problem areas.
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Yes looks like an NAS flanged multihex nut and probably falls under a MIL spec somewhere.
Seen literally millions in my career on everything from wheel hubs to turbine and compressor cases.
Finishes differ from a "black" finish to a silvery white depending mainly on the environment it has to deal with.
Ciao
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Cheers all
I'm looking for the metric version Is there any metric NAS or are they all inch sizes?
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Hey Tris .
ARP here in America has what your looking for and they may have distribution in Europe
http://arp-bolts.com/
Paul B :boozing:
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I have seen advertised 12 point wrenches to get a very good grab on these things. I think that for their size they can accept large set torque.
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Cheers all
I'm looking for the metric version Is there any metric NAS or are they all inch sizes?
Yep, Eurocopter uses them..metric sizes.
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Metric. In Belgium.
http://www.anemo.eu/node/1075
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carrillo rods came with "SPS-Carr" nuts which looked like that
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http://www.spstech.com/home/
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Yep, Eurocopter uses them..metric sizes.
On MBB (Eurocopter) BO 105 helicopters the engine to main transmission driveshaft bolts were "on condition " but changed to one time use. They fit the Guzzi crown wheel perfectly. Nice bolts, ground threads, serial numbered and all that. The rest of the helicopter is metric, with the exception of the engine, Allison C20, now Rolls Royce. A lot of very nice metric hardware, wish I would have pocketed more"work order residue"
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On MBB (Eurocopter) BO 105 helicopters the engine to main transmission driveshaft bolts were "on condition " but changed to one time use. They fit the Guzzi crown wheel perfectly. Nice bolts, ground threads, serial numbered and all that. The rest of the helicopter is metric, with the exception of the engine, Allison C20, now Rolls Royce. A lot of very nice metric hardware, wish I would have pocketed more"work order residue"
Nice hardware, all right. I'll bet they cost enough to make the suspenders wearing Guzzi Guy drop his pipe. :smiley:
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And swallow his snoose at the same time!
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Didn't Triumph use these type of nuts to hold the barrels on to the crankcase? I've got a few flowing around here somewhere.
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.....and the later BSA A65s but without the sleeve on top
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Probably not quite this quality..
Nice bolts, ground threads, serial numbered and all that.
or price. :smiley:
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I think those driveshaft bolts were only about 300 bones apiece.
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Some later airheads used these on the final drive to swing arm studs, I think 10mm threads.
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I think those driveshaft bolts were only about 300 bones apiece.
Aviation certification and product liability adds a bit to the price.