[ARC5] Screw lengths for receivers

[WA5CAB at cs.com]

The ATA/ARA manual has a similar list of fasteners "APT TO BE REQUIRED...". 
 But there are no clues as to whether you may need one or a hundred.  
Interestingly, #3-48 x 1/4" is not on the list.  It jumps from 7/32" to 9/32".

The AN/ARC-5 maintenance manual has a similar list, which does include a 
#3-48 x 1/4" nickle plate screw.  A note on it says that items shown in bold 
are the only ones likely to be needed during routine maintenance.  Of the 
#3-48 screws, items in bold are 5/32" black and 3/16" and 1/4" nickle.  My 
guess is that these would be the screws holding components to the side of the 
chassis, the tube cover and capacitor cover screws, and the bottom cover 
screws.

Robert D.

In a message dated 09/28/2012 10:33:01 AM Central Daylight Time, 
kgordon2006 at frontier.com writes: 
> On 28 Sep 2012 at 6:43, J. Forster wrote:
> 
> >I've seen 3/16" and 1/4" but have no idea what goes where.
> >
> >Also some are plated brass, some (stainless?) steel. Some are also
> >SEMS or KEPS and have integral lockashers.
> 
> I finally DID find a chart listing all the screws for the entire SCR-274N 
> sets, 
> but so far none for the AN/ARC-5 or ARA sets. 
> 
> There are quite a number of different 3-48 screw lengths and types, but it 
> 
> doesn't list where they go. I am sure some are used only in the 
> transmitter 
> and other places, and not the receiver.
> 
> I compared screw lengths from what appears to be an original receiver that 
> 
> had never been modified and found 4 different lengths (so far), all of 
> which 
> had lock-washers included, including those three short ones at the bottom 
> front, although the lock-washers there were embedded in the paint and 
> almost impossible to remove.
> 
> According to the SCR-274N manual, all the 3-48 binding head screws are 
> brass, two sizes plated with cadmium, and the other several sizes plated 
> with 
> nickle or were black. There were two sizes that were EITHER cad or nickle 
> plated.
> 
> As soon as I can get to my list, I'll post the information, in shortened 
> form, 
> here.
> 
> Kenneth G. Gordon W7EKB
> 

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480