Custom Du-bro push rod threading and sizing - DIE Help

Discussion in 'Set up tips Forum' started by Curtis Maglinger, Jun 5, 2018.

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  1. Jun 5, 2018 #1

    Curtis Maglinger

    Curtis Maglinger

    Curtis Maglinger

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    I have some Du-bro push rods that have 4-40 & 2-56 rod and want to put some threads on it. I bought a K & S Metals 4-40 & 2-56 die and tried threading, but the threads were too small. Any help or recommendations is much appreciated.

    Thanks in advance.
     
    Last edited by a moderator: Jun 5, 2018
  2. Jun 5, 2018 #2

    John Beardslee

    John Beardslee

    John Beardslee

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    Hi Curtis

    Those all have roll form threads. You probably purchased a cut thread die which would require a rod diameter of 3/32 for the 4-40 or 1/16 for the 2-56

    Thanks John
     
  3. Jun 5, 2018 #3

    Alan Elzer

    Alan Elzer

    Alan Elzer

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    Solder brass tubing to the rod then solder a threaded piece to it. Like John said the rod is smaller & won't thread.

    Another option I make a aluminum piece that you side the rod in each end & tighten set screw to hold. I have them for 2-56 & 4-40 rods. I'll send a picture shortly

    Sent from my SM-N920V using Tapatalk
     
  4. Jun 6, 2018 #4

    Mike Starrett

    Mike Starrett

    Mike Starrett

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    You can also just force thread a threaded clevis onto a non threaded end of rod. Yea, it'll go on there (with some effort) and then solder the clevis to the rod. It's there forever. Always sand the rod before soldering.
     
  5. Jun 6, 2018 #5

    Curtis Maglinger

    Curtis Maglinger

    Curtis Maglinger

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    John - Thx for the info. That roll thread tool is out of my leave.

    Allen - Thx for the info, I was trying to do it without soldiering and extra pieces.

    Mike - Thx for the info I was trying to do it without soldiering

    I saw that some have used 1/8 Nickle alloy welding rods with the 4-40 die? Any other high strength rods tha would be strong for rudders that work with a 4-40 die?
     
    Julio Almazan likes this.
  6. Jun 6, 2018 #6

    John Beardslee

    John Beardslee

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    Id stop by a welding shop and see if they would give you a piece of stainless steel TIG rod. 3/32 diameter. 1/8 diameter would be for a number 5 size thread not a number 4. Ive used music wire but its really hard and youd need really good and sharp die using Tap Magic cutting fluid which you should always use anyway.
     
  7. Jun 6, 2018 #7

    longballlumber

    longballlumber

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    Along the lines of what John has suggested... If you want 4-40 threads on a 1/8" SS TIG welding rod; you can cut the threads with a 5-40 die then go back and chase the threads with a 4-40 die.

    McMaster.com is a great resource for "stuff" like this.

    Later,

    Mike
     
  8. Jun 6, 2018 #8

    John Beardslee

    John Beardslee

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    I sometimes take an 1/8 SS TIG rod and spin the end I want to thread down to 3/32 on a belt sander with a 220 belt. You only have to remove about .030 off the O.D. or .015 per side. The threads are less critical if youre using plastic rod ends, more critical if youre using metal rod ends.

    Thanks John
     
  9. Jun 6, 2018 #9

    GraysonTaylor

    GraysonTaylor

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    A betaine micro torch from Home Depot makes soldering easy. Wish I had tried one sooner.
     
  10. Jun 30, 2018 #10

    Martin Hamilton

    Martin Hamilton

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  11. Dec 21, 2018 #11

    Gary Staus

    Gary Staus

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    you can use 6-32 on 1/8 in rod 
     
  12. Dec 23, 2018 #12

    steve wood

    steve wood

    steve wood

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    i use 17-4 ss rod from mcmaster carr
     
  13. Jul 18, 2019 #13

    Mike Cathey

    Mike Cathey

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    Amazon bought Small Parts Inc and you can get 18-8 ss all thread 4-40 X 36" for $11. Way, way stronger than any of the junky hobby store stuff.Takes a bend without breaking. Great for linkages. Works for wing struts on scale boats. Get some 5/32 alum tubing and slide it over the all thread and the wing struts look pretty authentic.
     
  14. Jul 18, 2019 #14

    Lee Whiteley

    Lee Whiteley

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    Thanks for that Mike. Just what I needed.

    Lee
     
  15. Jul 18, 2019 #15

    Julio Almazan

    Julio Almazan

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    Hi:
    pictures, please?
     
  16. Jul 18, 2019 #16

    Aaron Lavigne

    Aaron Lavigne

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    Lavigne Marine has custom stainless push rods available.

    https://lavignemarine.com/store/product/stainless-steel-push-rods
     
  17. Jul 19, 2019 #17

    Mike Cathey

    Mike Cathey

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    Hi Lee, if you look further down on the list in this forum you will see an article on "rigging an 8255" that might help you when you put together your new sport 40
     

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