K3 assembly: split lockwasher: #4 same as 4-40 ?

[Andrew Moore-3]

K3 manual Rev L, page 16, references "4-40 split lockwasher" and "#4 split
lockwasher"

Are these the same?  All the inventory pages say #4
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[Doug Joyce]

Andrew:  Yes they are the same.

 

73,  Doug  VE3MV
 

> Date: Fri, 18 Jun 2010 11:38:18 -0400
> From: [hidden email]
> To: [hidden email]
> Subject: [Elecraft] K3 assembly: split lockwasher: #4 same as 4-40 ?
>
> K3 manual Rev L, page 16, references "4-40 split lockwasher" and "#4 split
> lockwasher"
>
> Are these the same? All the inventory pages say #4
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[Don Wilhelm-4]

Andrew,

They are the same, although for a washer or lockwasher, the 4-40 is a
misnomer, the #4 designation for the hole size is correct, but the -40
refers to the thread pitch, and there are no threads in a washer.
Just for additional information, most of the screw hardware in the K3 is
4-40 although there are a few 2-56 size.  There is a big difference in
the diameter, so you are not likely to mix the two.

73,
Don W3FPR

Andrew Moore wrote:
> K3 manual Rev L, page 16, references "4-40 split lockwasher" and "#4 split
> lockwasher"
>
> Are these the same?  All the inventory pages say #4
>
>  
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[Ken Kopp-3]

It's already been pointed out that "4" in "4-40"
defines to the size of the screw / hole, and "40"
is the threads-per-inch specification.

There are three kinds of lock washers used in
Elecraft kits and each has a specific application.
The "split" is obvious, and there are both internal
and external tooth lock washers.  Elecraft does
a good job of illustrating the differences with the
photographs in the assembly manuals.

73! Ken Kopp - K0PP
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