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  #1  
Old 12-02-2018, 04:27 PM
Freemasm Freemasm is online now
 
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Default Hi-loks, recommended sources

I need specific sizes/lengths. Does anyone have a recommended source? Let me know. Much thanks
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  #2  
Old 12-02-2018, 05:35 PM
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Mike S Mike S is offline
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Quote:
Originally Posted by Freemasm View Post
I need specific sizes/lengths.
For what application????
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  #3  
Old 12-02-2018, 07:48 PM
Freemasm Freemasm is online now
 
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Default Shear

All shear apps. so titanium, steel, 7075, lots of
options can be used. Replacing AD6s in the spar. Being ?out of order? will make bucking (more) difficult. I can provide part numbers (several would work)
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  #4  
Old 12-02-2018, 08:10 PM
David Paule David Paule is offline
 
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I expect that gen-aircraft-hardware.com or skygeek.com will have them.

Dave
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  #5  
Old 12-03-2018, 04:38 AM
fixnflyguy fixnflyguy is offline
 
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Default KLX Aerospace

I work in the heavy aircraft overhaul business, and we currently use KLX Aerospace for most of our fastener procurement. My RV-4 is built with Titanium Hiloks in almost every location that an AN bolt of permanent installation was called out. I also used Titanium bolts in the other 99% of the locations, as well as Titanium reduced head screws for every panel, fairing ect. having been in the industry for 38 years, I have been able to get these items easily. I probably only saved a few pounds, but I am a huge fan of Hiloks and even took some to OSH years ago to talk with Van himself about his thoughts. For most folks, understanding a proper transition fit, precise hole reaming, pricing and the other associated installation quirks, Hiloks are less appealing.
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  #6  
Old 12-03-2018, 06:17 AM
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rocketbob rocketbob is offline
 
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A few years back a friend of mine who worked at an airline facility that was shut down gave me a half-full 5 gallon bucket of titanium NAS bolts of various lengths. Took me a while to sort thru them all but needless to say I have a lot of titanium bolts in my rocket.
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  #7  
Old 12-03-2018, 03:08 PM
Freemasm Freemasm is online now
 
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Default Thanks

Please keep the suggestions coming. Hi-loks are a great product. They were used on the Space Shuttle Heat Shields (and other places) in my early engineering days. Many times they were utilized without their dedicated collar but with standard MS locking nuts as a "one sided" fastener. Also used where low their profile heads provided an advantage. Replaced some huck bolts in certain certified aircraft with them many years ago but I can't remember where they were bought.

I will try gen-aircraft-hardware and KLX aerospace. Not a fan of skygeek.com. I think they are purchase/resale type of operation. Ordered some "in stock" firewall sealant from them then given a three week ship date after I'd paid. They still charged a "restock" fee so they will never make another dime from me (thread drift, sorry). As mentioned, please keep the suggestions coming.

Scott F
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  #8  
Old 12-03-2018, 03:16 PM
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Toobuilder Toobuilder is offline
 
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eBay is another source of surplus hardware. I'm on the hunt now for a set of oversized Ti Hi-Loks for the wing center section in my Rocket. You may not get them all at once, but they don't go bad with age.
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WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.

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  #9  
Old 12-03-2018, 03:30 PM
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Steve Melton Steve Melton is offline
 
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FWIW, while the Ti 6-4 bolts are stronger and lighter, the nice feature of AN bolts is their ductility and much greater elongation to failure. for the limited number of bolts on an RV I don't believe the weight savings of Ti offset the durability of a AN bolt.
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  #10  
Old 12-03-2018, 04:19 PM
Freemasm Freemasm is online now
 
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Default Yes and No

@Steve Melton. Thanks for your reply. Respectfully, I believe you're both right and wrong here. All rivets should be in shear application. Likewise, titanium should never be used in tension. When using something other than a rivet that swells to fill the hole in the stack, the structural integrity of the joint/assembly is assured by the diametrical close tolerance(s). The properties of ductility don't really come into play. Supporting evidence =

- the same fastener in shear application is typically torqued to ~45% of same in tension application (you can win some bar bets with that one).

- No Hi-lok pin material has inferior structural qualities to 2117 even after stain hardening.

They're also a great application for places for where a rivet gun can't go, as well.

I've been fortunate to work and know some very smart people. There's also a bunch here on VAF that will call BS on me where needed. Thanks for your reply.
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