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Home✈️Aircraft🚁Helicoptere-AlignT-REX 600 › Looking for main shaft to main gear bolt
03-14-2018 03:55 AM  27 months ago
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BrianApp

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Grand Rapids, MI

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Looking for main shaft to main gear bolt
I am wondering if anyone knows what hardware manufacture makes an M3 screw with a 15mm non threaded part. I am replacing the bolt that goes through the main gear to main shaft. The one Align makes for it is 19mm total length but it is just a few mm too short. The threads never reach the nylon part of the locknut so the only way to snug it up is to compress it on the tail gear which is what you don't want to do. If it was just 22mm long the nylon insert would grab it and I wouldn't need to tighten down on the tail gear. Align usually gets these things just right so I don't know why this bolt is just a few mm too short. I thought I could just get the bolt through a hardware manufacture or fastener shop and cut the excess down to size but I can't find any with 15mm non threaded. Align sells the 19mm bolts for this but that is too short to reach the nylon.
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03-14-2018 04:20 AM  27 months ago
BeltFedBrowning

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Kansas City

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I just buy longer bolts and cut them off. I have a large stash of 3mm bolts. I can measure one for you if you need.
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03-14-2018 04:38 AM  27 months ago
co_rotorhead

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Centennial, CO, USA

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http://www.aligntrexstore.com/Screw-H60158-_p_1303.html

2 shouldered M3 main shaft bolts (22mm) and 2 shouldered M4 main blade bolts (27mm).

$3.
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03-14-2018 04:49 AM  27 months ago
Doublah

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USA

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Mcmaster Carr has everything.
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03-14-2018 06:11 AM  27 months ago
BrianApp

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Grand Rapids, MI

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The trick when looking at hardware bolts is to get the non threaded part at 15mm to cover the main shaft and tail gear hub but not longer to push the nut out of the tail gear. My 550 manual showed a 19 going in there which is a bit too short.
When I did a search for 550 parts the closest I found was-

http://www.aligntrexstore.com/M3-so...245_p_1973.html

The 19mm the manual says fits. I didn't think to expand the search to 600 parts which the shaft and gear are.
I think the bolts listed in the post above are for this and would have the best chance of the non threaded part lining up.
No matter how obscure I think my question is someone here has the answer.
Thanks.

No more cracking the tail gear hub to get the bolt to snug up.
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03-17-2018 08:21 AM  26 months ago
BrianApp

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Grand Rapids, MI

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The screw bag mentioned 3 posts above fits perfect. It is a small thing but with the 20mm the threads never reach the nylon insert in the nut. To get it so it is not totally loose you have to tighten it on the tail gear hub which stresses the hub unnecessarily and you are told not to do in the manual. My hub was cracked and since there is a metal sleeve inside the hub this had to have been the main reason. With the 23mm screw from the post it snugs on the lock nut and there is no pressure on the hub from the screw, just as it should be. Granted it took 5 years to crack the hub but the screw is the wrong size. At some point I probably used the proper screw for the hub somewhere else in the frame.
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03-18-2018 08:02 AM  26 months ago
heligek

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drunen (nb) holland

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💎Sustaining Member
Main bold
You can look for a vario main bold, they have the longer version .
Part numbers you can find on there web site, different sizes available.
Greetings rinie
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