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Neubaten (Industrial)
28 Oct 08 9:47
Hi everyone,
I'm looking for a nut that is equivalent to the Alcoa (kaynar) p/n H97-4. It seems that the code H97-* is obsolete, and people only offers now the Boeing p/n BACN10HR*C for this code.
I can't seem to find a standard for this kind of nut, as I don't want to buy it under a boeing spec. Do any of you guys know where I can find more info?
It is not a common nut, and Alcoa doesn't manufacture nothing equivalent.
Also, I would like to know about the same nut, non silver-plated, if such thing exists.
Many thanks in advance for any help, I'm going nuts (very bad joke, I know) looking for info on this damned little piece.
CoryPad (Materials)
28 Oct 08 10:34
The standards for this type of part would be NAS#### from AIA: 字串4
http://www.aia-aerospace.org/ Regards,
Cory
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.
wktaylor (Aeronautics)
29 Oct 08 15:28
Neubaten...
The PN crossover is correct.
H97-( ) was supperseded by BACN10HR [A286 or I-718, 220-KSI]
I suggest You need a BACN10HR4CD [cad plated + SFL] or BACN10HR4CF or CS [passivated + SFL].
If a 220-KSI spline nut is OK, check-out MS14491 [spec: NASM14491].
If a 180-KSI 2X-Hex nut is acceptable, then check-out NAS1805-( ).
Regards, Wil Taylor
Neubaten (Industrial)
30 Oct 08 6:50
Ok, many thanks for your help.
As I said I don't want to buy under a Boeing spec, and all I needed was another reference standard. 字串8
I'll take a look into tyhe MS's you have provided.
Also, I found the same exact nut into an old catalogue yesterday, but, to my frustration, the company (voi-shan or something like that) doesn't even exist nowadays...
Neubaten (Industrial)
30 Oct 08 6:53
BTW, what I need is the 220 ksi nut, cadmium plated, UNJF-3B .2500-28 thread.
wktaylor (Aeronautics)
30 Oct 08 7:28
Neubaten...
The torque pre-load for a 220-KSI fastener system appears to have prompted MSxxxx to standardize on the spline-drive system.
Also... might want to look at...
M85730/1 [Spec NASM85730/1, Spline drive I-718, 220-KSI with captive washer, 900F]
NOTE: a few LA steel nuts are rated for 220-KSI... but the classic saying "rusted-N-busted" comes to mind... 字串5
Regards, Wil Taylor
TVP (Materials)
30 Oct 08 8:48
Neubaten,
The former Voi-Shan is now part of Alcoa Fastening Systems. Use the following link to obtain more information on products, contacts, etc.:
http://www.alcoa.com/aerospace/en/products/browse.asp?country_id=999&market_id=26&market_cat_id=342
Neubaten (Industrial)
30 Oct 08 9:26
I've looked into Alcoa product range, but they have no direct substitution for the H97 12 point nut.
They have the H55038, which is very very similar (only slight non-functional dimensional differences), but still, I would like to find the NAS, AS... more generic equivalent for the 12 point, self-locking, 220 ksi little bastard.
The spline drive nuts you guys comment are interesting, but I think of them as an alternative/substitution in case I can't find the exact match, because I don't want to change the installation tool at the shop and procedures and whatnot...
字串7
TVP (Materials)
30 Oct 08 9:38
I don't know the specifics of the nut that you need, but SPS has a number of 12-point nuts with 220 ksi strength. Use the following link to review the details (click on Data Sheet to see drawing):
http://www.spstech.com/aero/fastenerfinder/browseStyle.jsp?category=NUTS&type=16&style=12%20PT
tbuelna (Aerospace)
2 Nov 08 0:26
Neubaten,
MS21084 is a 220 ksi alloy steel, spline drive, self-locking nut, but is an obsolete standard:
http://docimages.assistdocs.com/watermarker/transient/4C029201F8DB4671B2414DC71EF68FDA.pdf
NAS1758 & NASM14164 are similar, but still active.
Good luck.
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