[Milsurplus] BC-611 case screw and MWO questions

[WA5CAB at cs.com]

Mike,

6L6348-12.5 must be a typo.  It would cross to a #3-48 x 1/2".  I don't 
recall where I ran across the correct part number (probably been years since) but 
the part number makes sense in a left-handed sort of way.  6L6832-7.94S would 
cross to a 5/16" long #8-32 screw.  But the screw is captive, meaning that the 
diameter from the head down a ways is approximately the minor diameter of the 
threads (no threads in that area).  And the remaining threads happen to be 
about 5/16" long.  If they had asked me, I would have done it the other way 
(-11.11) but I was born about 4 years too late.  :-)  BTW, the numbers following 
the dash in the 6L6 group "generally" indicate the length of the screw in mm.  
Length is length overall for flat head and length of threads for other head 
types.  An based on empirical data, I think that suffix "R" and "B" mean round 
and binding head respectively, and suffix "S" is steel.

It is relatively easy (if you only need a few) to make the correct screws in 
a lathe, using an #8-32 threaded spacer and lock nut to hold the end of the 
screw.  Several applications of black Magic Marker comes close to looking like 
black oxide finish.

In a message dated 9/30/2005 10:10:18 AM Central Daylight Time, 
kk5f at earthlink.net writes: 
> Thanks very much for the info, Robert.  It appears that none of the units
> I've run across have the appropriate "official" screw and washer.
> 
> My May 1945 TM 11-235 on the page 98 maintenance parts list gives the SC
> stock number for the top plate screw as 6L6348-12.5, and the washer as
> 6L50523, but provides no further description.

Robert & Susan Downs - Houston
<http://www.wa5cab.com> (Web Store)
MVPA 9480
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