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-   -   Hex/Allen vs. Torx(Plus) vs. Phillips (https://vansairforce.net/community/showthread.php?t=76933)

Draker 09-18-2017 11:33 AM

Quote:

Originally Posted by vernon smith (Post 1204346)
Great catch, several months ago I purchased 100 7032TF2085 8-32 x .5 Torx flat head screws that were listed as 100 degree. I ordered the ones on the order form above more recently. I went to the same area on their web site and ordered the 6-32 assuming it would be 100 degree as well. I looked into it today and they do not list a 6-32 Torx 100 degree.


I sent them a note asking if 6-32 100 degree are available as well as a request for an RA. Now we will see how easy they are to deal with on returns :)

Yea, the reason I caught that was I was also looking around online for non-Philips (either Torx or allen head) screws and am typing these criteria over and over. 8-32 + Flat head + 100degree + Cadmium plated + longer than 1/2 inch seems like an extremely difficult if not impossible combination to find.

vernon smith 09-18-2017 08:41 PM

Microfastener lists them all the way down to 2-56. For their prices the source has to be China so all bets are off on quality. That's what I like about aames, you get aviation quality fasteners-at a ridiculously high price. However, usually what we are securing with a 6-32 screw is not life endangering if a failure occurs. From my experience with a Chinese fastener the failure will come with the original tightening, if at all. Usually the problem will be the Torx broached six point hole will strip out. In that case we are right back where we were with the Phillips :confused:

http://www.microfasteners.com/fcmxs0...stainless.html

Draker 09-28-2017 10:07 AM

Thanks for the link to Microfasteners. Unfortunately they don't seem to have #8 screws longer than 1/2 inch. Was hoping to go with torx or allen heads to attach the capacitive plates inside my tanks, but those need to be at least 8R14. The search continues...

RV7A Flyer 09-28-2017 10:17 AM

Quote:

Originally Posted by Draker (Post 1207267)
Was hoping to go with torx or allen heads to attach the capacitive plates inside my tanks

Um...why? Planning on putting them in and out a bunch of times? IIRC, I installed them once and then sealed up the tanks. :)

Bicyclops 09-28-2017 04:18 PM

McMaster Carr

https://www.mcmaster.com/#socket-hea...crews/=19l2kub

I like the black oxide ones.

Ed Holyoke

Draker 09-28-2017 07:28 PM

Quote:

Originally Posted by RV7A Flyer (Post 1207274)
Um...why? Planning on putting them in and out a bunch of times? IIRC, I installed them once and then sealed up the tanks. :)

Mostly due to my stripping a few heads trying to drive them in at the angle they are. However reading some other tips here, the better solution to that looks like applying some boelube or wax to the thread and using a little patience. Probably makes more sense than using different screws.

Low Pass 09-28-2017 07:46 PM

Quote:

Originally Posted by maniago (Post 1203983)
Those I see are stainless. SS on Al promotes galvanic corrosion in the presence of water.. Do you use them on the exterior of your ship or just interior? If exterior, how have you combated the corrosion issue?

I've been using stainless (austenitic) hex and Torx head screws for ~14, 15 years and they work just fine for a hangared plane. Every no 6, 8, and many of the non structural 10 screws in my plane comes from Micro Fasteners. Just make sure those few snug nutplates have been chased with a tap. That's maybe 1 out of 75-100. I do nothing special for galvanic corrosion except keep it out of the rain.

vernon smith 09-28-2017 07:52 PM

Quote:

Originally Posted by Bicyclops (Post 1207394)
McMaster Carr

https://www.mcmaster.com/#socket-hea...crews/=19l2kub

I like the black oxide ones.

Ed Holyoke

These appear to all be 82 degree which is understandable, 100 degree is virtually unknown outside the aircraft industry. Few people are screwing together .016" sheets to .032 sheets and the like.

Bicyclops 09-28-2017 08:57 PM

Socket head screws
 
Somebody was asking about socket head screws. The link I posted was right to that page. McMaster is also a good source for wobble Allen driver bits.

I get my cad plated 100 degree countersunk screws from ACS and live with the Phillips head. Once they show any wear at all, I throw them away.

Ed Holyoke

CubedRoot 04-16-2018 01:24 AM

I'm guessing that no one has been able to source 100 degree, flush head, torx fasteners for structural use, such as the fuel tank and inspection panels yet, have they?

I have browsed the micro fasteners website, but they are stainless screws, which are a bit softer than the AN screws Van's supplies. I am not sure I want my fuel tanks held on with them. McMaster only has 82 degree screws :-(


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