[Premium-Rx] 590 Dzus Fastener

[w4nj at tampabay.rr.com]

I buy these for my Collins KWM-2As from McMaster-Carr on their Internet Site. They have many sizes as well as the rivets and the screws.

73,

Cliff - W4NJ
---- ToddRoberts2001 at aol.com wrote: 
> In a message dated 8/17/2007 11:01:42 AM Eastern Standard Time, 
> had at to-way.com writes:
> Hi Gang,
> 
> Looking for two dzus fasteners for the bottom cover on my RF-590.
> 
> Hadley, K7MLR
>  
> Hi Hadley,
> That's an interesting dilemma. From what I have been able to find out about 
> Dzus fasteners they are mostly used nowadays in aircraft and auto racing or 
> custom autos to fasten flat panels that can be removed quickly, like access 
> panels. The ones used in autos usually have large 1/2inch diameter bodies.
>  
> They use an odd numbering system for the Dzus fasteners. The ones used in the 
> RF-590 are Flat-Head with a diameter of 7/16 inch across the top, have a body 
> diameter of 1/4 inch, an undercut under the head for a retaining ring and a 
> body length that looks to be about 3/8 inch.
>  
> The only place I could find that has anything similar is skybolt.com . They 
> have two part numbers that could be a very close match :
>  
> Either SKFJ4-35SS  or SKFJ4-40SS.  The letters FJ stand for Flat Head with 
> undercut. How long an undercut I am not sure. The first number 4 stands for the 
> diameter of the body in 1/16ths of an inch, so 4 means 4/16ths or 1/4 inch. 
> The second number 35 or 40 stands for the length of the body in hundredths of an 
> inch. Perhaps the slightly longer 40 would be the best bet to work in the 
> RF-590. The SS stands for stainless steel.
>  
> The Dzus fasteners in the RF-590 should have never gone missing as they use a 
> pretty robust retaining ring to hold them in place. Maybe if someone hammered 
> on them or else someone had to really force them out. The new ones won't have 
> the retaining rings so they could fall out when loosened but should hold the 
> dust cover in place just like the originals when tightened. 
>  
> The price of the new fasteners is about $2.73 each in small quantities from 
> skybolt. Or maybe someone out there has a couple of extras in their junkbox.
>  
> 73 Todd WD4NGG
> 
> 
> 
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