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j nuts other uses

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larry(at)macsmachine.com
Guest

Posted: Tue Dec 19, 2006 2:40 pm Post subject: j nuts other uses

John,



In recommending these, I should take some responsibility for answering 

this. J-nuts and U-nuts are great for surface assemblies, but they are 

not intended for places where shear is a major factor. I have used them 

on the forward top skin, the wing joint covers, wheel fairing halves, 

center console, the front edge of inspection plates held by a spider 

spring on the leading half of the lower wing and a cosmetic fiberglass 

tail saddle. They work really very well in each of these cases. There 

are probably a few more.



I’d not recommend them for carburetor ducts on the engine, air ducting 

for engine cylinders, for holding the center bolt on a spider-held 

inspection plate, attaching hangar-bolts for wheel fairings or any place 

where they encounter the direct pulse of a vibrating exhaust, prop 

spinner or part that depends upon movement or absolute safety of 

connection such as a control linkage. I'd also not use them in a 

permanent assembly like rivets that was not accessible in the completed 

aircraft. Nut plates are much better where tension and shear have to 

hold wheel fairings to a fork-hanger, etc and all of these things should 

be considered when selecting hardware.



Larry McFarland – 601HDS at www.macsmachine.com



john butterfield wrote:

 	  Quote: 	
		   



 hi list

 i used larry McFarland's recommendations for the

 forward top skin and could not be happier.  thanks for

 that info



 now i am looking over the plans and find that the j

 nut method of securing panels and other things seems

 like a good alternative



 i can think of several places to use them, the arm

 rest, inspections plates, ect.  my question is where

 have you people used them on the aircraft.  I know

 that i will miss  some obvious areas, but any ideas

 would be good.  also, is there a downside to using

 j-nuts to fasten metal together

 regards

 john butterfield 

 601XL corvair

 torrance, ca

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601zv(at)ritternet.com
Guest

Posted: Tue Dec 19, 2006 3:33 pm Post subject: j nuts other uses

For you guys that know about these things, what would be the advantage of 

J-nuts over U-nuts, or in what sort of application would one be preferable 

over the other?

    Robin in AR

    N601ZV



---

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larry(at)macsmachine.com
Guest

Posted: Tue Dec 19, 2006 5:22 pm Post subject: j nuts other uses

Robin,



The sides of the u-nuts are full length and the non-thread engaging side 

is bent up at the tip to make it easier to slip onto an aluminum edge.  

J-nuts are made with the non-thread side cut off at center of the hole.  

They both have a small edge spur that clips into the hole to retain 

position. They both will self-center a little bit as do nut-plates to 

ease engaging the thread with the fastener. The J-nut is preferable if 

the fastener is to be attached at an edge where the mating sheet will 

overlap, close down over the fasteners  and not be visible, something 

like the sides of the forward top skin.  The J-nut is selected for a 

slightly shorter edge-to-hole distance to assist with the flush fit. The 

u-nut has full-length sides that engage a flange edge easier which makes 

them preferable for simple assembly.  Functionally, they do the same 

thing and u-nuts are selected edge-to-hole for mid-flange position holes 

as might be already drilled or punched for rivets.  This makes it easy 

to convert from rivets to j-nuts or u-nuts as needed in a panel like the 

forward top skin.

http://www.macsmachine.com/images/largeassembly2/full/uclips.gif

http://www.macsmachine.com/images/canopy/full/flash&rubber.gif

As you can see in the above links, both types were used as described above.



If anyone has difficulty finding these, I've several boxes of both types 

and will part with them

at their basic cost plus pkg and mailing.



Larry McFarland - 601HDS at www.macsmachine.com



Robin Bellach wrote:

 	  Quote: 	
		   



 For you guys that know about these things, what would be the advantage 

 of J-nuts over U-nuts, or in what sort of application would one be 

 preferable over the other?

    Robin in AR

    N601ZV

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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