Metric fasteners

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Metric fasteners

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  • #622692
    Peter Howell 1
    Participant
      @peterhowell1

      In 1982 the British Standards Institute (BSI) published PD6507. 'Guidance on metric screw threads and fasteners for use by model engineers'. I acquired a copy (the company I worked for had a BSI account). It specifies a range of metric fasteners etc scaled to represent full size e.g. Whitworth. So bolt head hexagons are not as normal metric.

      It appears to have never been adopted.

      I intend to use metric fasteners on my latest model but I'm having problems in finding small (2.5mm) hex head bolts. So far all I've found are in stainless. Plenty with socket heads but this is not in keeping with the model.

      What do others, who've adopted metric, do ?

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      #28941
      Peter Howell 1
      Participant
        @peterhowell1

        Metric fasteners for model engineering

        #622698
        Oldiron
        Participant
          @oldiron

          If you have a mill maybe you could machine the hex down to a better looking size to suit your model.

          regards

          #622702
          DiogenesII
          Participant
            @diogenesii

            I've bought more than once from this German company; example of their stuff;

            GHW – Bare Steel Hex Head Screws for Modelling

            There's a little 'Flag' icon in the top left corner to change the language. Nice products, with useful descriptions.

            #622703
            Thor 🇳🇴
            Participant
              @thor

              Hi Peter,

              I tend to make studs and use nuts, and it isn't easy to find M 2.5 hex head bolts where I live.

              Thor

              #622711
              Peter Howell 1
              Participant
                @peterhowell1
                Posted by DiogenesII on 26/11/2022 10:47:48:

                I've bought more than once from this German company; example of their stuff;

                GHW – Bare Steel Hex Head Screws for Modelling

                There's a little 'Flag' icon in the top left corner to change the language. Nice products, with useful descriptions.

                Not come across them. There's a lot of useful looking stuff on their website and you can use PayPal. I'll give them a go.

                #622720
                JasonB
                Moderator
                  @jasonb

                  i also use GHW mostly nuts but do have some hex head screws in stock for the odd occasion that they are needed. You may have a job finding 2.5mm dia steel for studs but I've made 20+ engines using 3/32" steel whick takes the M2.5 thread Ok.

                  If you don't want to but from mainland Europe then Polly Eng keep some of GHW's range.

                  Not sure what the BSI specifies but generally the GHW ones are one size smaller so M4 is 5.5mm hex etc. They are also fully machined with single chamfer so look a lot better than mass produced standard metric ones.

                  This shows M4 & M3 standard in the middle, GHW outside

                  nuts.jpg

                   

                  Edited By JasonB on 26/11/2022 13:11:23

                  #622724
                  Gep Engler
                  Participant
                    @gepengler40547

                    Here, in The Netherlands, we have this company: **LINK** (website unfortunately in Dutch only).

                    For instance, on this page of that site, you find small (starting M1,2 x8) metric steel hex head screws with high heads: **LINK**

                    Regards from The Neherlands,
                    Gep

                    Edited By Gep Engler on 26/11/2022 13:29:35

                    #622727
                    John Haine
                    Participant
                      @johnhaine32865

                      In case people aren't aware if you are using Chrome (and possibly Firefox?) then right clock in a web page and select translate….

                      #622738
                      duncan webster 1
                      Participant
                        @duncanwebster1

                        Not sure if the same problem exists bringing stuff in from abroad, but my sister in law has had to give up sending presents to her granddaughters in Germany, the bureaucracy was impenetrable.

                        #622764
                        Dave Smith 14
                        Participant
                          @davesmith14

                          m2.5 studding is available at many sources on the internet just google it.

                          #622766
                          JasonB
                          Moderator
                            @jasonb

                            I prefer proper studs with threads just at the ends smiley

                            #622768
                            Peter Howell 1
                            Participant
                              @peterhowell1
                              Posted by JasonB on 26/11/2022 17:11:33:

                              I prefer proper studs with threads just at the ends smiley

                              Yes. But these are for through bolts with nuts on the other end holding brackets onto the frame. Would look odd having studding with a nut both sides.

                              Edited By Peter Howell 1 on 26/11/2022 17:32:36

                              #622772
                              File Handle
                              Participant
                                @filehandle
                                Posted by Peter Howell 1 on 26/11/2022 10:04:23:

                                I

                                I intend to use metric fasteners on my latest model but I'm having problems in finding small (2.5mm) hex head bolts. So far all I've found are in stainless. Plenty with socket heads but this is not in keeping with the model.

                                What do others, who've adopted metric, do ?

                                Although quoted in Imperial dimensions BA is a metric system.

                                #622777
                                JasonB
                                Moderator
                                  @jasonb
                                  Posted by Peter Howell 1 on 26/11/2022 17:30:34:

                                  Posted by JasonB on 26/11/2022 17:11:33:

                                  I prefer proper studs with threads just at the ends smiley

                                  Yes. But these are for through bolts with nuts on the other end holding brackets onto the frame. Would look odd having studding with a nut both sides.

                                  Edited By Peter Howell 1 on 26/11/2022 17:32:36

                                  Peter, my comment was aimed at Dave Smith who suggested studding, that would look even worse for your use.

                                  If long bolts are needed I make them from round stock and mill the hex with the aid of the spin indexer

                                  Another German supplier that is quite good is Knupfer with a similar range of fixings

                                  Edited By JasonB on 26/11/2022 18:45:19

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