[Elecraft] K3S ground screw

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It depends on which AI you ask. Per Grok: 

Bill, the ground screw on the Elecraft K3 transceiver’s rear panel is a 6-32 thumbscrew. It measures 1/2 inch long with a 3/8 inch diameter knurled head (part number E700070). This secures the ground connection using two #6 flat washers.

73,
Bill WE5P
Comfortably Numb

> On Aug 23, 2025, at 12:57, Jack Brindle via Elecraft <elecraft at mailman.qth.net> wrote:
> 
> Interesting. Perhaps AI isn’t all it is being touted.
> 
> According to the K3S Manual, the ground screw is a #6-32 thumbscrew, Elecraft Part Number E700070.
> 
> As I recall, it is at least 1/2” in length (probably 3/4”), but it has been a long time since I had the ground screws out of my K3s.
> It also has two #6 flat washers on the shaft.
> 
> I would note that the same thumbscrew is used on other Elecraft products.
> 
> 73,
> Jack, W6FB
> 
>> On Aug 23, 2025, at 11:22 AM, Greg Beat via Elecraft <elecraft at mailman.qth.net> wrote:
>> 
>> The ground screw for the Elecraft K3S is a 4-40 (SAE) threaded screw.
>> A 4-40 screw has a number 4 diameter and 40 threads per inch.
>> 
>> Although the exact length can vary depending on what you are connecting, the manuals (Elecraft) often refer to using 1/4" or 3/16" screws of this type for internal assembly.
>> For a ground connection, you would use an appropriately sized lug and wire that matches the screw's thread (Elecraft #E770091)
>> 
>> Answered by: Gemini, Google’s Artificial Intelligence (AI)
>> ***
>> Assistance by W9GB, supplying e-mail ISP.
>> 
>> Elecraft P/N E770091 : 33 foot Ground Wire with Lug.
>> https://elecraft.com/products/e770091_e77009133-ground-wire-with-lug
>> 
>> ==
>> Date: Sat, 23 Aug 2025 10:27:13 -0400
>> From: Bill DeVore <maxrcul at gmail.com>
>> To: elecraft at mailman.qth.net
>> Subject: [Elecraft] K3S ground screw
>> 
>> Does anyone know the specs on the grounding screw?
>> Dia, pitch and length?
>> Bill - W3PNM
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