Trying to locate an odd fastener....

I need to find 88 of these little suckers:

http://www.geneb.org/images/screw-side.jpg

http://www.geneb.org/images/screw-top.jpg

It's a Hi-Torque coin-slot style screw. It's threaded 10-32 and is about .45" long.
The head is the important part, the diameter is about .272-.273 according to my Harbor Fright caliper.

The head diameter is different enough that I can't use regular 100 degree flat head screws. The holes in the trim section I'm repairing was countersunk for this exact screw.

The replacement screw doesn't have to be a coin-slot screw, but it would be nice.

Any suggestions? Aircraft Spruce & Wicks do not seem to carry them.

Thanks all!

Gene.

I believe I've seen this size and type of head on titanium screws (phillips screw head). Might try Boeing - I'm sure someone up there will know where to get something close enough to use. Also look in AC 43-13-2B hardware chapter - perhaps you can use something similar to a huuck bolt, etc as a substitute. Good luck!
-Joel Marketello

Er... What is AC 43-13-2B? :)

It may be titanium. The head has "2-5" stamped along the edge and there's another number I can't make out, even with a loupe. :(

The material it's holding down is about .040" and by eyeballing the shoulder of the screw in question, looks to be about that "high".

Thanks!

g.

AC stands for "Advisory Circular." Go to faa.gov and look up Advisory Circulars. AC 43-13-2B is over a dozen chapters of information on major repairs/modifications and it is a wealth of information, most of which can also be used as approved data in field approval mods, etc.
-Joel Marketello

Quote:

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Originally Posted by jam0552@msn.com

Also look in AC 43-13-2B hardware chapter -

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Minor correction, actually, it's 43.13-1B that has fastener hardware. -2B is about alterations.

Quote:

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Originally Posted by f15sim

I need to find 88 of these little suckers:
Any suggestions? Aircraft Spruce & Wicks do not seem to carry them.

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Is there anything to suggest these are aerospace fasteners?

Those are definitely aerospace fasteners. Gene, do the dimensions match up with any of these?

They look like the ones we use on our FA-2 Sea Harrier. Yep thet are aviation. I will try and get you a link to a supplier a little bit later.


Pete

I sent you a sampler pack yesterday with a grip gauge. Sorry for the tardy reply but I have been busy selling stuff.

email photos and links to Duane at Spencer Aircraft. They can find them. duane@spenceraircraft.com. You might be able to go to the online store as well. www.spenceraircraft.com

The screws on the sea Harrier are made by BAE (K0289). The P/N for the various lengths are: STD2180D20, STD2180D25, STD2180D30.
The NSN's are 5305-99-603-0073 -4517 -4518 We expect to obtain a second Sea Harrier this coming spring/summer and it is supposed
to have some spares with it. If you don't find what you need from the others on this forum, let me know and I will get you a link to
a British supplier....

Pete

Thanks for the info folks. The fasteners are VERY aerospace. They're off the straight trim section for the F-15C canopy I'm repairing.

Matt, the catalog you sent has a lot of cool info, but I didn't find that exact fastener. They list the .190 x32 thread for many of the fasteners, but the nominal grip specs don't seem to go higher than .406. The fastener I've measured is .454. I don't know if this is enough of a difference to worry about however.

RV8505: Left you voicemail today. No rush on this, it's ok. Thanks for the samples!

2VW: Yeah, I already tried Spencer's. The impression I got wasn't very good. The counter girl took the screw back to some guy in the back room and by the conversation I heard, they weren't terribly interested in helping or even offering suggestions. I wasn't even asked what it was for or any other questions. The counter girl handed me the screw back, said they don't carry them and basically wandered off after asking me if there was anything else. Wow. I don't mind vendors hiring eye candy, but would it hurt them to get the brand that can make squiggles on an EEG? :)

Thanks folks!

g.

F15. I put an email into Duane anyways and he indicates he would see if he can locate.

Meanwhile not the fastener you are looking for, but they thought these links may be of interest. You may already have them? And they may be of no interest at all.


http://wlstorage.net/file/us-f15c-tews-2000.pdf
http://wlstorage.net/file/boeing-f15...ystem-1998.pdf
http://wlstorage.net/file/boeing-f15...ystem-2001.pdf

Thanks 2VW. Of the three, I was missing the auto-flight system manual. Thanks for that!

g.

F15 can you provide a better closure of the top of the head?

A what?

g.

sorry iPad auto correct.

a better close up photo.

Hehehe. No problem. I'll see if I can find a screw that's got a less marred head as well. I'm picking up the raw material to fab the new trim piece today, so I'll be in the shop.

tnx!

g.

Even better if you can also take photo of where on the canopy this goes as well.

The fasteners are for the trim pieces that run from the mid-canopy seam all the way forward.

I grabbed a loupe and examined one of the cleaner fasteners. The number on it is HT-4041-3. My Nikon can't resolve details that small without a different lens.

Here's a pic of the canopy: http://www.f15sim.com/wp-content/upl...1/canopy-1.jpg

tnx!

[edit]
I just remembered that I had an IPB dated from '77. After much digging, I found these part numbers:
HT4024L3-6, HT4024L3-4 and HT4024L3-3.

Unfortunately, Google search results are poisoned by a**hat middlemen websites. :(

g.

These are "Hi-Torque" bolts manufactured the by Hi-Shear Corp. They are best known as the makers of "hi-lok" fasteners. Look at the attached web page:

http://www.hi-shear.com/fastener_ht.htm

Cheers,
Kurt

Quote:

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Originally Posted by Kurt Flunkn

These are "Hi-Torque" bolts manufactured the by Hi-Shear Corp. They are best known as the makers of "hi-lok" fasteners. Look at the attached web page:

http://www.hi-shear.com/fastener_ht.htm

Cheers,
Kurt

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Kurt, I notedwhile looking at the drawings of the fastener that there can be a "o" ring present on it when called for. Because the fastener must be removable ( unlike other areas that use sealant ) Do you suppose the "o" ring is used to help maintain cockpit pressurization?

Quote:

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Originally Posted by RV8505

Kurt, I noted while looking at the drawings of the fastener that there can be a "o" ring present on it when called for. Because the fastener must be removable ( unlike other areas that use sealant ) Do you suppose the "o" ring is used to help maintain cockpit pressurization?

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The trim piece I'm working with is outsize the pressurization section. I can scan the page in the -4 if you guys are really curious about it. :)

Kurt, I'll contact Hi-Shear today and see if they can help me. Thanks for the help! (all of you!)

I also want to add that if any of you folks are in the Pacific Northwest and would like to check out the F-15, you're more than welcome to! Just send me a PM so we can make arrangements.

g.

Quote:

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Originally Posted by f15sim

The trim piece I'm working with is outsize the pressurization section. I can scan the page in the -4 if you guys are really curious about it. :)

Kurt, I'll contact Hi-Shear today and see if they can help me. Thanks for the help! (all of you!)

g.

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I sent you some countersinks, draw clecos and a cherrymax grip gauge yesterday. Reduced head screws, I didn't have any, aircraft spruce didn't have any, but I would bet http://www.gen-aircraft-hardware.com/ would have some. Their web site is down but I bet he would have reduced head screws. Hi-shear is going to be expensive. You better sit down when they give you a quote.

I sent a email to Rick G on the Van's airforce web site. Rick is a sheetmetal man and built f-15s. Hopefully he'll show up here and shed some light on the where and why of that fastener.

Thanks a ton RV8505. I contacted Wesco Aircraft (they're the local rep for Hi-Shear) and I'm waiting to hear back.

aaaaaaand SCOOOORE! Those fine folks at Genuine Aircraft had the parts! They're in an offset cruiciform head, but they had drive bits too so there we go. :)

Thanks all!

g.

Quote:

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Originally Posted by f15sim

Thanks a ton RV8505. I contacted Wesco Aircraft (they're the local rep for Hi-Shear) and I'm waiting to hear back.

aaaaaaand SCOOOORE! Those fine folks at Genuine Aircraft had the parts! They're in an offset cruiciform head, but they had drive bits too so there we go. :)

Thanks all!

g.

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Just for my own information I would still like to know the what, where, and why they are slotted like that and application especially with one with the o ring?

I suspect the slot design has to do with being able to put a lot of torque on the screw and not have the driver bit jump out of the screw head. The coin slot bit has a bit of a dovetail on the end of it and you slide the driver in from the side, not insert it perpendicular to the face. I couldn't tell you what the O ring is all about - it's not present in the fasteners that I've removed.

From what I hear from a friend of mine, Grumman was a big fan of those little monsters too. :)

g.