What kind of fastener is this?

[KirbyWan]

Howdy all,

I am trying to locate what type of fastener this is. It is from A CF6-80C2 thrust reverser and the part number is 491B0700024B105 (pretty sure). The part number is from MRAS who gives most fasteners their own number so it becomes difficult to cross reference and the same fastener from the manufacturer is less expensive. Does anyone have a cross refence to convert MRAS fastener part numbers to the part numbers of the manufacturer similar to Boeings D-590 document. And can anyone indicate what kind of fastener this is? I've been told its a swedge (or swage?) huck, but I have not been able to locate it on Alcoa's website. Any help will be appreciated. This fastener is a blind that has a left-hand threaded stem with a couple of flats on the end. the tool grips the flats on the stem and turns the nut which pulls the blind portion of the fastener in. Similar to Jo-bolt, but I'm pretty sure it is its own thing. The head markings are V8 21 and 10 as can be seen in the picture.

Thanks for you help.

Kirby Wilkerson

Remember, first define the problem, then solve it.

 

[WKTaylor]

KirbyWan..

What looks like V8 is actually VS = Voi-Shan (Alcoa purchased VS many years-ago]. It is a Jo-Bolt type fastener.

I am having trouble seeing the fastener head style. Is this a FLUSH head or a round protruding head (and tapered edges... certainly not typical for PH Jo-Bolts)???

If it is a flush head, then does it look like a core fastener in a sleeve?

Regards, Wil Taylor

 

[KirbyWan]

Here is a picture from the side. It is a protruding head with the general shape of a cylinder with a 45° camfer around the circumfrence. I looked at some similar fasteners (491B0700062B030 and 491B0700062B090) that we have in stock and in place of the VS they say M1 or MI. I agree that it is VS after looking again after reading your message.

The blind head is different from a cherry. The sleeve tapers down and the head deforms (apparently) by stretching around the taper as it is pulled. If this doesn't make sence I can go grab a fastner from stock and take a picture of it.

Thanks for your help Wil. I hope to know as much about fasteners as you do, and I think it's going to take many years of study (and discovering several sources of secret information) to get there.

-Kirby

Kirby Wilkerson

Remember, first define the problem, then solve it.

 

[WKTaylor]

KW..

Ref MIL-HDBK-57E LISTING OF FASTENER MANUFACTURER’S IDENTIFICATION SYMBOLS
MI = Monogram Aerospace Fasteners, Used on Composi-Lok OSI Bolts, Radial-Loks & MAF Pins... and all new bind fastener designs.

http://www.monogramaerospace.com/#

I suspect that is a Composi-Lok II low profile head... and the blue hints that the body may be anodized titanium... however also may be CRES with a (flaking/worn) SFL coating... OH well

See attachment for a data sheet from Monogram.


Regards, Wil Taylor

 

[bf109g]

Kirby -

My experience with MRAS has always been positive. I'd call and ask to speak to one of their repair engineers, even if you have to lie about your question. Those guys have always been extremely helpful.

 

[KirbyWan]

Thanks for everyones help. After digging around on Monogram aerospace's website I found this page:

http://www.monogramaerospace.com/support/cross_references

This page crosses A/C manufacturer's P/N's to Monogram P/N's. The two fasteners that I was looking for the 491B0700024 crosses to an MBF2010 and the 491B0700062 crosses to either an MBF2110 or MBF2120. All of the drawings are there as well under /support/drawings.

-Kirby

Kirby Wilkerson

Remember, first define the problem, then solve it.