"can anyone tell me what "4-40" refers to" (was "[Elecraft] K3 #685 arrived")

[Gary Hvizdak]

At 01:11:22 EDT on Monday 28 Apr 2008 Chris Meagher (VK2LCD) wrote ...

... K3/10 #685 basic kit arrived 28 April.  Inventory done, all there but no
"4-40" nuts.  ... can anyone tell me what "4-40" refers to ...

--

Hi Chris,

    Referring to http://www.wikihow.com/Read-a-Screw-Thread-Callout it is
possible to calculate that these nuts mate with a screw having a maximum
(outside) diameter of 2.8448 mm, and 15.748 threads per cm.

    Also see http://en.wikipedia.org/wiki/Unified_Thread_Standard for a
detailed drawing of the thread profile.

73,
Gary  KI4GGX

P.S. BE SURE TO TIGHTEN ALL HARDWARE PER THE INSTRUCTIONS IN THE ASSEMBLY
MANUAL to ensure that RF doesn't "leak" from the enclosure.  (This will
become even more critical if/when you install the 100W PA.)