1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

What's the difference between drive shafts with a bolt and those with a nut?

Discussion in 'A3/S3 Forum (8L Chassis)' started by vfr800, Sep 29, 2013.

  1. vfr800
    Offline

    vfr800 Active Member

    Joined:
    Feb 28, 2012
    Messages:
    742
    Likes Received:
    44
    [Sep 29, 2013]
    Hi

    As the title says really.

    My S3 has a long hex bolt that holds the driveshaft to the hub.

    i just got a second hand subframe (taken straight off an S3) with wishbones, hubs, and driveshafts. But the driveshafts have an external thread for the star nut on the end.

    Is it all inter changeable?

    liam
    #1
  2. Ads

    Ads

    [Nov 27, 2014]

  3. <tuffty/>
    Offline

    <tuffty/> Badger 5 Edition Staff Member Moderator

    Joined:
    Sep 14, 2008
    Messages:
    16,316
    Likes Received:
    1,493
    [Sep 29, 2013]
    Bolt is better but both will fit...

    <tuffty/>
    #2
  4. phil miller
    Offline

    phil miller Member

    Joined:
    Sep 9, 2012
    Messages:
    845
    Likes Received:
    83
    [Sep 29, 2013]
    Can i ask why the bolt type is better as almost every driveshaft in the world is the other type (nut)

    Just wondering really tbh
    #3
  5. <tuffty/>
    Offline

    <tuffty/> Badger 5 Edition Staff Member Moderator

    Joined:
    Sep 14, 2008
    Messages:
    16,316
    Likes Received:
    1,493
    [Sep 29, 2013]
    Nut ones are nylocks typically (in VAG circles at least)... heat transference from the brakes under extreme conditions can melt the nylon causing the nut to loosen... granted its extreme circumstances..

    Also... thread length on the bolt means there is more distribution of load from a given torque... with a nut you only have the depth of the available threads on the nut... whether or not VAG had issues to prompt the change who knows but from an engineering perspective the bolts arguably are better

    <tuffty/>
    #4
  6. phil miller
    Offline

    phil miller Member

    Joined:
    Sep 9, 2012
    Messages:
    845
    Likes Received:
    83
    [Sep 29, 2013]
    I had never thought of it like that, and that makes perfect sense, id always liked the bolt type (A4 passat, mk5 golf) because it makes changing the cv boot easy :)

    so if i had a set of front hubs from an S3 that were the bolt type and Rons shafts are the nut type whats the best way round that?
    #5
  7. <tuffty/>
    Offline

    <tuffty/> Badger 5 Edition Staff Member Moderator

    Joined:
    Sep 14, 2008
    Messages:
    16,316
    Likes Received:
    1,493
    [Sep 29, 2013]
    Had a look at a hub bolt before I left Bills today and there is a coned part at the top of the bolt under the head that suggests there is a chamfer on the hubs... not compared the hubs on nut/bolt types so can't comment but suggests that contrary to my previous statement while they should fit its more a case of whats compromised if you do... assuming the bolt type has a chamfer on the hub if you had bolt type previously then fit nut type the surface area the nut face clamps too would be less...

    If you have all the hubs/legs etc then all should be good... if you buy a nut type CV to replace a bolt type CV (or vica versa) then I would be checking before using...

    In context of Liams swap then as long as you fit all the components you have (hubs/shafts etc) then it will be fine but if you were to mix and match then I'd stick to the CV type thats designed for the hub you are fitting it too

    <tuffty/>
    #6
    phil miller likes this.

Share This Page