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Gig Giacona
Joined: 10 Jan 2006
Posts: 1416
Location: El Dorado Arkansas USA
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craig(at)craigandjean.com
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 Posted: Tue Dec 26, 2006 12:17 pm Post subject: Are these the J-Nuts? |
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Those are U nuts with a threaded insert for a machine screw. AS&S also has U
nuts for sheet metal screws: look about 2/3rds of the way down
www.aircraftspruce.com/catalog/hapages/tinnerman.php
I've looked long and hard and don't think Spruce offers J nuts. Don't forget
that Larry offered the many that he had left over.
BTW: don't forget this (From the Spruce web page: "IMPORTANT: Speed nuts for
aircraft are designed to fit standard AN530-AN531 type B sheet metal screws
only. Do not use pointed type A sheet metal screws with aircraft Speed nuts.
There is a difference in root diameter and thread pitch. Screw lengths: B
type sheet metal screws have a blunt taper at the end. To be certain the
fastener prongs grip on the full root diameter, the screw should protrude
two to three threads beyond the prongs."
-- Craig
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VideoFlyer(at)aol.com
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| Posted: Tue Dec 26, 2006 12:35 pm Post subject: Are these the J-Nuts? |
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The ones you want....from McMaster Carr.
McMaster-Carr
Type "J Nuts" in the search box...
[quote][b]
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Gig Giacona
Joined: 10 Jan 2006
Posts: 1416
Location: El Dorado Arkansas USA
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| Posted: Tue Dec 26, 2006 1:49 pm Post subject: Re: Are these the J-Nuts? |
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Ok... the next question is (aimed mainly towards Larry) is Shape 1 or 2?
[quote="VideoFlyer(at)aol.com"]The ones you want....from McMaster Carr.
McMaster-Carr
Type "J Nuts" in the search box...
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_________________
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR |
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larry(at)macsmachine.com
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| Posted: Tue Dec 26, 2006 5:59 pm Post subject: Are these the J-Nuts? |
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Hi Gig,
The shape for u-nuts and j-nuts can be either. I used standard u-nuts
and shape 2 j-nuts, but
more recently ordered on the most important items 6-32 with edge
distance of .468 j style - #94809A102
and 6-32 with edge distance .296 - #94808A401
Shape is secondary to thread and edge distance. Wide or narrow work the
same but narrow is sometimes easier
to get on in close quarters.
Larry McFarland - 601HDS at www.macsmachine.com
do not archive
Gig Giacona wrote:
| Quote: |
Ok... the next question is (aimed mainly towards Larry) is Shape 1 or 2?
[quote="VideoFlyer(at)aol.com"]The ones you want....from McMaster Carr.
McMaster-Carr (http://www.mcmaster.com/)
Type "J Nuts" in the search box...
> [b]
>
--------
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=83648#83648
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Terry Phillips
Joined: 11 Jan 2006
Posts: 346
Location: Corvallis, MT
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| Posted: Tue Dec 26, 2006 8:46 pm Post subject: Are these the J-Nuts? |
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Larry
I am very attracted to the convenience of the j-nuts, but I am concerned by
the potential for corrosion problems, since I am unable to find any j-nuts
with cadmium plating to eliminate galvanic corrosion with aluminum. How did
you address this problem? Did you use steel screws, cad plated steel screws
or aluminum screws? Are you concerned about the potential for corrosion
between the screws, nuts, bulkheads, and skin?
Terry
At 07:59 PM 12/26/2006 -0600, you wrote:
| Quote: |
Hi Gig,
The shape for u-nuts and j-nuts can be either. I used standard u-nuts and
shape 2 j-nuts, but
more recently ordered on the most important items 6-32 with edge distance
of .468 j style - #94809A102
and 6-32 with edge distance .296 - #94808A401
Shape is secondary to thread and edge distance. Wide or narrow work the
same but narrow is sometimes easier
to get on in close quarters.
Larry McFarland - 601HDS at www.macsmachine.com
do not archive
Gig Giacona wrote:
>
>
>Ok... the next question is (aimed mainly towards Larry) is Shape 1 or 2?
>[quote="VideoFlyer(at)aol.com"]The ones you want....from McMaster Carr.
>
> McMaster-Carr (http://www.mcmaster.com/)
> Type "J Nuts" in the search box...
>>[b]
>>
>--------
>W.R. "Gig" Giacona
>601XL Under Construction
>See my progress at www.peoamerica.net/N601WR
>
>
>Read this topic online here:
>
>http://forums.matronics.com/viewtopic.php?p=83648#83648
>
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Terry Phillips
ttp44(at)rkymtn.net
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_________________
Terry Phillips
Corvallis, MT
ttp44<at>rkymtn.net
Zenith 601XL/Jab 3300 slow build kit - Tail feathers done; working on the wings. |
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larry(at)macsmachine.com
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| Posted: Wed Dec 27, 2006 6:30 am Post subject: Are these the J-Nuts? |
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Hi Terry,
I've had the u-nuts and j-nuts in service for over 2 years and can find
no signs of galvanic action on them or the cad plated steel screws.
Nothing was done to address the problem, but again, as the forward top
skin has been off a 3 or 4 times this past 2 years, there is no evidence
of corrosion. I don't believe there is any potential, unless the
aircraft was constantly exposed to rain and snow or the plane had to set
in a hangar within a mile of ocean salt air. I see they've been
phosphate treated and that's probably why they
are without corrosive activity.
Larry McFarland - 601HDS at www.macsmachine.com
Terry Phillips wrote:
| Quote: |
Larry
I am very attracted to the convenience of the j-nuts, but I am
concerned by the potential for corrosion problems, since I am unable
to find any j-nuts with cadmium plating to eliminate galvanic
corrosion with aluminum. How did you address this problem? Did you use
steel screws, cad plated steel screws or aluminum screws? Are you
concerned about the potential for corrosion between the screws, nuts,
bulkheads, and skin?
Terry
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