Rescuing a Stuart Triple Expansion engine

Discussion in 'Engines From Castings' started by wgreeley, Nov 8, 2018.

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  1. Nov 8, 2018 #1

    wgreeley

    wgreeley

    wgreeley

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    I have obtained a Stuart Triple Expansion engine by an unknown builder. The problem I am having is locating replacement hardware The engine was built with 4-36 hex head machine screws. Does anyone know of a source for these.

    Thanks
    Bill
     
  2. Nov 8, 2018 #2

    WOB

    WOB

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    To get hex head, you will likely have to machine blanks from hex bar stock and buy a 4-36 die( ebay).

    WOB
     
  3. Nov 9, 2018 #3

    SmithDoor

    SmithDoor

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    Last edited: Nov 9, 2018
  4. Nov 9, 2018 #4

    kvom

    kvom

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    I wouldn't use slotted screws myself.
     
  5. Nov 9, 2018 #5

    abby

    abby

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    Are you sure that the screws are UNS 4-36 ? as you will have found out this is by no means a common thread.
    It would be a crime to fit anything but scale hexagon head screws to your engine and a possible solution might be to re-tap the holes M4.
    This will be a few thou larger on the screw diameter but screws are available with a size smaller head so that scale appearance can be maintained.
    The same can be said for BA threads which I use for all my hexagon head screw modelling requirements , still easily obtainable here in the UK , but I have the stock of several long departed model engineers which will last me for my lifetime and leave plenty to pass on after.

    Dan.
     
  6. Nov 9, 2018 #6

    10thumbs

    10thumbs

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    4x36 taps are available from Brownells', for use in gunsmithing. Across the pond, but available.
     
  7. Nov 9, 2018 #7

    abby

    abby

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    Yes the taps are available in the UK too , but how does that help ? Bill is looking for a source of suitable hexagon head screws .
    Dan
     
  8. Nov 10, 2018 #8

    Drillrod

    Drillrod

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    I might be able to help, as I have that size thread tooling and a (limited) supply of 11/64" (.176" a/f) steel hex stock to produce a small batch of 4-36 screws. If .176" across the flats will work for you, let me know the length and quantity required.
    Drillrod (nyc)
     
  9. Nov 11, 2018 #9

    Apprentice707

    Apprentice707

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    I recently bought a very nice set of American small size taps and dies from Chronos, about £32 if I remember rightly.
     
  10. Nov 13, 2018 at 5:15 AM #10

    john_reese

    john_reese

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    Forget Fastenal. On my last visit I saw a sigh that they were only selling business to business.
     

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