[Premium-Rx] Re: [Premium] 590 Dzus Fastener

[Steve Sykes]

Had,
Email me an address and I will send you the 2 you need.

Steve
W2SES
Had wrote:
>
>
> Todd,
>
> Thanks for all the info on Dzus fasteners. Your info gave me enough 
> information to do some on line searching. I found that the original 
> RF-590 bottom cover fasteners used by Harris are F4-25, NSN 
> 5325-00-449-3059. Using on line surplus parts locators I have found 
> many available around the world and I'm attempting to find a company 
> who will sell a small quantity, like 20.
>
> Again thanks for the info, I'll post this to the premium group just in 
> case others might be interested.
>
> Hadley, K7MLR
>
>
> At 02:21 PM 8/17/2007, you 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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