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  1. #1
    Join Date
    Jul 2008
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    near Warragul, Victoria
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    3,585

    Default NUT, hex., S., %-24NF-2 (steering arm stud).

    Hi

    I need to make some special 3/8 UNF 'deep' nuts for a Jeep project. The steering knuckle studs require long or deep nuts , around .5" in length.

    The originals are corroded and I am guessing are probably a grade 5 nut in todays terminology.

    I could probably use hex bar and make them but what grade of steel is suitable and it needs to be soft enough to be hand tapped ?

    Thanks

  2. #2
    Join Date
    Aug 2008
    Location
    Melbourne
    Age
    32
    Posts
    953

    Default

    1045 would probably do, 4140 if you want to go nuts
    Specialist fine pitch gear cutting from 0.1 Module
    www.rigear.com.au

  3. #3
    Join Date
    Mar 2014
    Location
    South of Adelaide
    Posts
    977

  4. #4
    Join Date
    Jul 2008
    Location
    near Warragul, Victoria
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    Default Yep thanks

    Quote Originally Posted by snapatap View Post
    Yes I did find those last night - But I am not sure about the 'bright' grade . Do they mean mild steel I wonder. I guess I could ask them.

    Would 303 grade stainless be an option ? Problem is finding it in hex bar.

    I did think of 1045 , it probably would be OK but not easy to find in hex bar around here, I might ask at the machine shop in town.

    Found these: https://nhtb.com.au/ND%2038F%20BRT.html

  5. #5
    Join Date
    Jan 2004
    Location
    Mackay North Qld
    Posts
    6,177

    Default

    Quote Originally Posted by morrisman View Post
    Hi

    Hi Morrisman
    The steering knuckle studs require long or deep nuts , around .5" in length.
    Do you mean 5" long Morrisman ? Or .5" -half inch?

    If ss is alright to use, what about two stainless steel joiner nuts tacked together?
    I have seen them in smaller sizes ,so assume you can get larger ones.

    Just thinking out of the box. Where is the force on these nuts .In tension, compressive or lateral?

    Grahame

  6. #6
    Join Date
    Mar 2011
    Location
    Southern Flinders Ranges
    Posts
    1,145

    Default

    They’re available off the shelf in 304 stainless if you googlefu 3/8 UNF Stainless coupling nut. Standard size seems to be 1 1/8” long.

    Personally I would not put stainless in the suspension of a motor vehicle

  7. #7
    Join Date
    Nov 2008
    Location
    North Brisbane. Qld. Australia
    Age
    68
    Posts
    1,223

    Default

    Maybe this mob does a small quantity.

    https://www.allfast.co.nz/products/d...17621398650937
    Nev.

  8. #8
    Join Date
    Nov 2007
    Location
    melbourne australia
    Posts
    3,067

    Default

    Quote Originally Posted by morrisman View Post
    I could probably use hex bar and make them but what grade of steel is suitable and it needs to be soft enough to be hand tapped ?
    According to Google, Grade 5 bolts are made from heat treated medium carbon steel. I think Elan is right to suggest 1045.
    Chris

  9. #9
    Join Date
    Feb 2013
    Location
    Laidley, SE Qld
    Posts
    993

    Default

    In a way the grade of nut used isn't important.
    The forces on the steering knuckle are transmitted to the suspension via the tapered shank and socket, there are no forces on the nut itself.
    The main jobs of the nut are to pull the taper up tight in the socket and to act as a safety should the taper come loose in the socket.

    From what I see of hex steel its mainly leaded steel.
    Assuming you do want to go with say 1045, for the small quantity you need it will probably be easiest to mill your own from round.

    If it were me I would be making the hex first and then doing the tapping.

  10. #10
    Join Date
    Jul 2008
    Location
    near Warragul, Victoria
    Posts
    3,585

    Default Good

    Quote Originally Posted by SurfinNev View Post
    Maybe this mob does a small quantity.

    https://www.allfast.co.nz/products/d...17621398650937
    They will do the job.

    The image shows the steering setup . The pre-load spindle setup using the shims is a critical adjustment on these old Jeeps , if not set up correctly the steering can go into a uncontrollable situation known as the 'death wobbles' which is when a wild side to side oscillation of the front wheels can occur. Driving over a railway crossing at speed can set it off , some people fit a steering damper but that isn't a ideal solution.
    Attached Images Attached Images

  11. #11
    Join Date
    Nov 2007
    Location
    melbourne australia
    Posts
    3,067

    Default

    Quote Originally Posted by morrisman View Post
    ...some people fit a steering damper but that isn't a ideal solution.
    Just curious- why not? Sounds a heck of a lot better than shims.
    Chris

  12. #12
    Join Date
    Jan 2004
    Location
    Mackay North Qld
    Posts
    6,177

    Default

    Quote Originally Posted by morrisman View Post
    Yes I did find those last night - But I am not sure about the 'bright' grade . Do they mean mild steel I wonder. I guess I could ask them.

    Would 303 grade stainless be an option ? Problem is finding it in hex bar.

    I did think of 1045 , it probably would be OK but not easy to find in hex bar around here, I might ask at the machine shop in town.

    Found these: https://nhtb.com.au/ND%2038F%20BRT.html
    Getting further out of the box! Why does it have to be a hex section? Would a round bar drilled and tapped and with two parallel turning flats suffice?

    If no mill, Hacksaw and file or tack a hex nut (drilled for clearance) to lock or turn it.

    Never give in or give up.

    Grahame

  13. #13
    Join Date
    Jan 2004
    Location
    Mackay North Qld
    Posts
    6,177

    Default

    [QUOTE=bob ward;1993051]
    From what I see of hex steel its mainly leaded steel. [QUOTE]

    Best NOT to weld on leaded steel then. My bad!

    Grahame

  14. #14
    Join Date
    Jul 2008
    Location
    near Warragul, Victoria
    Posts
    3,585

    Default MOre

    The allfast mob in N.Z.... turns out they are a wholesaler to the trade and they are not interested in a backyard hobby person.

    I think I can source some 1045 from ABC metals in Hallam, they are a short walk from the train station , I have a MYKI card somewhere ! Apparently Stainsfied-Smith has closed which is a real shame because they had in stock just about anything you needed. The present situation means I'm not sure about travelling anywhere right now , the COVID cases have gone nuts in Victoria .



  15. #15
    Join Date
    Apr 2007
    Location
    Newcastle
    Posts
    122

    Default

    Surely you aren't the first to encounter this problem, what have others done?

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