That makes sense. The chassis screws for the K3 family are 4-40. Perhaps that is what the original AI request actually answered.
I pulled the assembly manuals and internal assembly docs. The ground screws for the K3 and K3S all use part nr E600070, which is a 6-32 thumbscrew. So, for the OP, you can contact the support folks in Watsonville and get them to send you one of these (for a small fee I assume), or perhaps find one at a good hardware store. I find that Ace hardware has an excellent supply of all sorts of screws, perhaps even these. Otherwise, we probably purchase them from Mouser or DigiKey. 73, Jack, W6FB Elecraft Engineer from way back, now retired. I still maintain the KPA500, KRC2 and W2 firmware… > On Aug 23, 2025, at 12:29 PM, Main Account <[email protected]> wrote: > > 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 >> <[email protected]> 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 >>> <[email protected]> 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 <[email protected]> >>> To: [email protected] >>> Subject: [Elecraft] K3S ground screw >>> >>> Does anyone know the specs on the grounding screw? >>> Dia, pitch and length? >>> Bill - W3PNM >>> ______________________________________________________________ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:[email protected] >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >>> Message delivered to [email protected] >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[email protected] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
