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Reducing an M6 thread to M4.

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    Reducing an M6 thread to M4.

    As it say on the tin,

    We have a product that current has a laser cut hex hole for an M6 Hexsert, A change in design has required the thread size to reduced to M4.

    We have a few hundred of these already made, welding the hole is not an option so before we scrap them am looking to see if it there is a way to the thread to M4..

    Ive searched googgle with no luck so thought the PF brains trust might have some suggestions.


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    #2
    Can you drill the hexsert oversize and press/loctite a plug in to suit M4?

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      #3
      Originally posted by chartreusehj View Post
      Can you drill the hexsert oversize and press/loctite a plug in to suit M4?
      Drill and tap the plug ?


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        #4
        If this was a backyard fix, I'd get two washers to suit a M4 Rivnut and place them either side and use the Rivnut to clamp them in place. But, would depend on desired accuracy and wall thickness as it would add +/-1mm to the hole position tolerance. Presumably being M4, it's not holding a whole lot?

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          #5
          Originally posted by 36 View Post
          If this was a backyard fix, I'd get two washers to suit a M4 Rivnut and place them either side and use the Rivnut to clamp them in place. But, would depend on desired accuracy and wall thickness as it would add +/-1mm to the hole position tolerance. Presumably being M4, it's not holding a whole lot?
          Nah only holding a plastic fascia on a nudgbar.

          outer surface has to remain flush.

          Changed my search terms and found these on aliexpress.... only in brass or copper though so still searching.

          Click image for larger version

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            #6
            You need stainless?

            Not cheap:
            https://www.ebay.com.au/itm/262791917383
            or more expensive:
            https://www.mcmaster.com/97437A815/

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              #7
              Originally posted by Shonky View Post
              You need stainless?

              Not cheap:
              https://www.ebay.com.au/itm/262791917383
              or more expensive:
              https://www.mcmaster.com/97437A815/
              perfect, thanks.

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                #8
                Looks like you can get a M4 keysert with an m6 external thread.

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                  #9
                  Originally posted by uuheels View Post
                  Looks like you can get a M4 keysert with an m6 external thread.
                  I did find them in my searches, the M6 thread is .75 pitch... I need 1.00

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                    #10
                    Surely lathe work is cheap in Thailand?
                    Imagination is more important than knowledge.

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                      #11
                      Originally posted by Ben Wilson View Post
                      Surely lathe work is cheap in Thailand?
                      The machine shops we use here are on par with the machine shops our parent company uses in Melbourne, cost wise.

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