[Milsurplus] BC-348

[WA5CAB at cs.com]

George,

I would say in the equipment we normally talk about that during WW-II 
slotted head fasteners were much more common.  But certain contractors did use 
Phillips.  Collins for one.  Look at any COL--52286 or T-47, and most TCS 
components.  If a TCS receiver or transmitter has slotted screws (and if they 
are original to the set) then it isn't from one of the Collins built models.

I suspect the increase in usage of Phillips head screws came about with 
mass production of cheap electronics.  A magnetized Phillips screwdriver will 
hold a small screw well enough to do one hand installation, with automated 
equipment for example.  Anyway, it's just a guess but I'd say 60's and later.

I think Pozi-drive was an attempt to fix the relatively short service life 
of the Phillips screwdrivers.  But the main places I know of where 
Pozi-drive screws were for certain used were on door and seatbelt attachment 
hardware.  Which more recently seems to have changed to Torx.

In a message dated 8/16/2010 3:40:28 PM Central Daylight Time, 
gl4d21a at juno.com writes: 
> Robert:
> 
> Correct me if I'm wrong, but I seem to recall fasteners in WW2 were all 
> slotted head.  Now they all seem to be Phillips, or maybe Pozidrive lately.  
> What was the time frame when the transition away from slotted fasteners 
> occurred?
> 
> 73,
> George
> W5VPQ
> 
> ---------- Original Message ----------
> From: WA5CAB at cs.com
> To: milsurplus at mailman.qth.net
> Subject: Re: [Milsurplus] BC-348
> Date: Mon, 16 Aug 2010 15:21:14 EDT
> 
> Larry,
> 
> I suspect you mean SO-104. PL-P103 or PL-Q103 are the female connectors 
> used on the FT-154 Mount.
> 
> If so, original hardware is 1 ea #4-40 x 1-5/8" Round Head (sub Binding 
> Head if necessary) plus Ext lock washer to hold the two casting halves 
> together. The assembly mounts to the chassis with 2 ea #10-32 x 1-5/8" BH 
> plus 2 Ext 
> LW (sub 1-3/4" or sub 2" and cut off, and sub Round Hd if necessary). And 
> 2 
> ea #6-32 x 7/16" BH (sub 1/2") plus Ext LW.
> 

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