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Technical Nut's

Discussion in 'The Hokey Ass Message Board' started by brigrat, Feb 12, 2018.

  1. brigrat
    Joined: Nov 9, 2007
    Posts: 5,615

    brigrat
    Member
    from Wa.St.

    Most all 3/8" NC nuts take a 9/16" socket or wrench, do they make a 3/8" NC nut that will take a 1/2" wrench or socket? If so, have a name for it or a part number? Thanks!
     
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  2. blowby
    Joined: Dec 27, 2012
    Posts: 8,661

    blowby
    Member
    from Nicasio Ca

    Terrible80 and brigrat like this.
  3. Squablow
    Joined: Apr 26, 2005
    Posts: 17,388

    Squablow
    Member

    I've used a flap disc on an angle grinder to mill off some meat from a bigger nut to make them smaller, takes a bit of patience but if you only need a few it's not too bad. Would suck if you needed like 50 though.
     
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  4. Paul
    Joined: Aug 29, 2002
    Posts: 16,380

    Paul
    Editor

    Makes me think header stud/nuts, nuts are typically NF though..

    You could give tacoma screw a call.
     
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  5. KJSR
    Joined: Mar 7, 2008
    Posts: 2,494

    KJSR
    Member
    from Utah
    1. Utah HAMBers

    Drill and tap a 5/16 nut?? That's what I have done
     
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  6. DDDenny
    Joined: Feb 6, 2015
    Posts: 19,132

    DDDenny
    Member
    from oregon

    Done this a few times, don't even need a lathe.
     
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  7. Sheep Dip
    Joined: Dec 29, 2010
    Posts: 1,572

    Sheep Dip
    Member
    from Central Ca

    I have gotten some 3/8-16 rod couplers from time to time that were 1/2" across the flats at my local hardware store. I was not seeking them out so I could not say were they come from or who makes them, but they are made at least in a rod coupler form.
    A guy could cut or part them off on a lathe if he really has to have them without having to drill and tap some hex stock or a nut.
    Not sure of your situation but seems like a lot of effort for a 32nd on each side.
     
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  8. brigrat
    Joined: Nov 9, 2007
    Posts: 5,615

    brigrat
    Member
    from Wa.St.

    Paul, Got up this morning and Tacoma Screw was the first call I made only to be informed they are a construction orientated company (not automotive) BUT if they had a part number or "name" they might be able to help........................
    All of you have given me some great ideas, Thanks!
     
  9. Atwater Mike
    Joined: May 31, 2002
    Posts: 11,625

    Atwater Mike
    Member

    If those can have a 'washer' forged onto the bottom, they are called "USS Aircraft flange nuts". I've seen them in standard and SAE thread, 3/8" bore and 1/2" hex. A while back, though...
     
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  10. brigrat
    Joined: Nov 9, 2007
    Posts: 5,615

    brigrat
    Member
    from Wa.St.

    ^^^^^^^^^Wouldn't you know you would know! Thanks!^^^^^^^^^^^^^^
     
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  11. The 39 guy
    Joined: Nov 5, 2010
    Posts: 3,524

    The 39 guy
    Member

  12. brigrat
    Joined: Nov 9, 2007
    Posts: 5,615

    brigrat
    Member
    from Wa.St.

    Paul was close about the headers, need 6 nut's for a real tight fit header collector.
    Since I only need 6 I will be using KJSR advice and drill & tap a 5/16" nut.
    Mike & Sam, Don't think I have enough room for the built in washer base type nut but good info anyway. Thanks again!
     
  13. Couldn’t you machine the flanged washer down,you would only need to take off enough to clear your header tube and still end up with a partial washer as such.
    Just a thought.
     
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  14. brigrat
    Joined: Nov 9, 2007
    Posts: 5,615

    brigrat
    Member
    from Wa.St.

    Yep, Got a lathe I could do that and still might!
     
  15. blowby
    Joined: Dec 27, 2012
    Posts: 8,661

    blowby
    Member
    from Nicasio Ca

    How about just drilling and tapping 5/16" nuts?
     
  16. brigrat
    Joined: Nov 9, 2007
    Posts: 5,615

    brigrat
    Member
    from Wa.St.

    Post #2, #5 & #12!
     
    Last edited: Feb 13, 2018
  17. blowby
    Joined: Dec 27, 2012
    Posts: 8,661

    blowby
    Member
    from Nicasio Ca

    And 2!
     
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  18. brigrat
    Joined: Nov 9, 2007
    Posts: 5,615

    brigrat
    Member
    from Wa.St.

    I totally missed that, went straight to hyper link and missed the rest of the story! Sorry!
     
  19. rooman
    Joined: Sep 20, 2006
    Posts: 4,045

    rooman
    Member

    Why not use fine thread 12 point bolts and "K" (or Jet) nuts (reduced head size with flange). The nuts are self locking and if they do come loose they are not going to spin off the bolts as quickly as if you use "fast" bolts (race car builder definition of coarse thread fasteners). IMHO coarse thread bolts/studs should only be used in tapped holes in castings/soft metals.

    Roo
     
    31Vicky with a hemi likes this.
  20. I'll guess that a 5/16 nut drilled with 3/8 - 16 coarse thread will fail.
    The cut (Thread) is too deep and the height is shorter so there's less thread engagement. Equal torque on less threads is not going to make anyone happy.
    Fine thread would be about 10 times better and a deeper (taller) nut with more threads would the best you could hope for.

    There's at least a dozen ways to connect a header collector to an exhaust pipe, the 3 bolt flange being about the worst. What sort of manufacturer doesn't allow for bolt clearance in their flanges anyway?
     
  21. How about roll-your-own out of a piece of 1/2" hex stock, drill and tap for 3/8", then cut to size? Being header nuts, you could make them out of brass stock.
     
  22. blowby
    Joined: Dec 27, 2012
    Posts: 8,661

    blowby
    Member
    from Nicasio Ca

    No problem! If you do cut threads in plated steel nuts you'll be removing the corrosion protection. I've done them in brass and stainless as well as zinc plate.
     
  23. DDDenny
    Joined: Feb 6, 2015
    Posts: 19,132

    DDDenny
    Member
    from oregon

    Vicky
    Of coarse you know this:D
    Tap drill for 3/8-16 is actually 5/16" so worst case scenario is a very slight "hint" of the 5/16-18 thread showing (very slight), unless the original minor diameter was too big.
    The key (to any size) is a tap drill that is sharp and sharpened evenly so as to not cut oversize.
     
  24. Casual 6
    Joined: May 25, 2008
    Posts: 290

    Casual 6
    Member
    from Great NW

    Use these all the time and they don't fail:

    upload_2018-2-13_8-8-9.png
     

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