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  • #31
    Originally posted by mklotz View Post

    Usually there are lots more fun things to make on a model than fasteners. You might want to give a thought to buying rather than making...

    https://www.microfasteners.com/home.php?cat=576
    Are these screws from microfasteners anywhere close to model size, i.e., scaled prototype size (my loco is slightly larger than 1/8 scale)?

    For my loco I generally buy or make what are close to scaled prototype sizes. For example, a 6-32 model screw , which scales down from just about one inch, has a 7/32 (0.219) head that is 0.104 high; the nuts are also 7/32 hex and are .125 high. They also have washer lands on the heads and nuts. A typical 6-32 machine screw doesn't come with a hex head, and the nut is made from 5/16 (0.313) hex, much too large for model application.

    McMaster has a nice line of SS hex head screws and nuts; their 6-32 screw has a 1/4" (0.250) hex head, still too large, and is 0.085 high with no washer land. A sample 6-32 size is PN 92314A144. They are reasonably priced, but not quite what I need. My model hex cap screw supplier is OK, but I would like to find a second source.
    Central Virginia, USA

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    • #32
      I have been getting my nuts and machine screws from this:

      https://godshallscustommachining.com/index.html

      Very satisfied with their stuff.

      Geoff

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      • #33
        Originally posted by DaveD44 View Post

        Are these screws from microfasteners anywhere close to model size, i.e., scaled prototype size (my loco is slightly larger than 1/8 scale)?

        For my loco I generally buy or make what are close to scaled prototype sizes. For example, a 6-32 model screw , which scales down from just about one inch, has a 7/32 (0.219) head that is 0.104 high; the nuts are also 7/32 hex and are .125 high. They also have washer lands on the heads and nuts. A typical 6-32 machine screw doesn't come with a hex head, and the nut is made from 5/16 (0.313) hex, much too large for model application.

        McMaster has a nice line of SS hex head screws and nuts; their 6-32 screw has a 1/4" (0.250) hex head, still too large, and is 0.085 high with no washer land. A sample 6-32 size is PN 92314A144. They are reasonably priced, but not quite what I need. My model hex cap screw supplier is OK, but I would like to find a second source.
        Take a look at small metric: Bolt Depot has 18-8 SS tap bolts (fully threaded) in M3-0.5: 5.5mm/0.217" hex (no head height in their chart) and SS M3-0.5 hex nuts (also 5.5mm), that are 2.4mm/0.09" high. Nuts are $3.04/100 and 10mm long bolts are $7.65/100.
        Avid Amateur Home Shop Machinist, Electronics Enthusiast, Chef, Indoorsman. Self-Proclaimed (Dabbler? Dilettante?) Renaissance (old) Man.

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        • #34
          Originally posted by ammcoman2 View Post
          I have been getting my nuts and machine screws from this:

          https://godshallscustommachining.com/index.html
          Yes, I use, or used, them extensively, and for many years the couple who used to own this business, Ron and Barbara Hankins at American Model Engineering.

          Originally posted by ChazC View Post

          Take a look at small metric: Bolt Depot has 18-8 SS tap bolts (fully threaded) in M3-0.5: 5.5mm/0.217" hex (no head height in their chart) and SS M3-0.5 hex nuts (also 5.5mm), that are 2.4mm/0.09" high. Nuts are $3.04/100 and 10mm long bolts are $7.65/100.
          Oh! I had forgotten. I used M5-.8 high strength cap screws in several places where I needed the strength, such as the union of the main frame and the cradle--that piece that is behind the main frame, under the fire box, and above the trailing truck--which is an area that needs to be well-held (clip attached). They mimic the prototype scaled fairly well. But if they are to be seen, the tops of the screws must have the lettering skimmed off, which I didn't do here but should have.

          Click image for larger version  Name:	0615220804.jpg Views:	0 Size:	793.9 KB ID:	2004698
          Central Virginia, USA

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