Results 1 to 5 of 5

Thread: Wheel Stud Grade / Class?

  1. #1
    iHarley
    Name: iHarley

    iHarley's Avatar
    Join Date
    Jan 2011
    Location
    California
    Posts
    76
    Like
    1
    Liked 4 Times in 4 Posts

    Wheel Stud Grade / Class?

    Does anyone know the grade / class rating of the 14mm x 2.0 wheel studs?

    150lb/ft (per the owners manual) seems high for the nut torque and I would like to look this up in my Thomas Glovers Pocket Reference.

    Thank you so much!

  2. #2
    iHarley
    Name: iHarley

    iHarley's Avatar
    Join Date
    Jan 2011
    Location
    California
    Posts
    76
    Like
    1
    Liked 4 Times in 4 Posts
    Spend about an hour on the net trying to answer my question, all official information says 150ft/lbs, many other owners are concerned this is too much, and one guy lost a wheel (all studs broke) going down the highway.

    ISO Class 8.8 for a 14 x 2.00 stud is 133.5ft/lbs, can’t imagine Ford using any greater strength studs and so much of these parts are imported, and who knows what the quality control is like.

    So… for me, I’m using 130ft/lbs and will be putting a label on the inside of the center caps with this value.

  3. #3
    Word
    Name: Kevin

    Blind's Avatar
    Join Date
    Oct 2009
    Location
    Hella NorCal
    Posts
    2,370
    Like
    127
    Liked 63 Times in 58 Posts
    they're probably 10.8 rated

  4. #4
    World's Fastest Street HD
    Name: Josh

    Harley#356's Avatar
    Join Date
    Jan 2003
    Location
    NJ
    Posts
    31,073
    Like
    0
    Liked 6 Times in 6 Posts
    Guddentite is the spec I use for mine

  5. #5
    32V SC 5.4L #001
    Name:

    Madferraristi's Avatar
    Join Date
    May 2003
    Location
    Northern California
    Posts
    2,174
    Like
    0
    Liked 0 Times in 0 Posts
    Metric Grade 8.8 is equivalent to SAE Grade 5.
    Metric Grade 10.9 is equivalent to SAE Grade 8.

    SAE threaded Wheel Studs are grade 8 material. Metric Studs are grade 10.9.

    A Google search will verify this and on numerous occasions I have put studs in my Lathe for modification, they are both a bitsh to machine.

    150 lb/ft (or ft/lbs depending on whose chart you are looking at) on an M14x2.0 would seem to be comparable to the 154 lb/ft spec'd for a 9/16-12 UNC Grade 8. .551" vs .5625"

    However, this is with DRY THREADS. when lubricated, the torque spec. can drop as low as 77 lb/ft, depending on what lube is used.

    The reason they are spec'd so high is that wheel studs are not intended to be lubricated. A Google search will confirms this in many places though I could not find the official SAE document.

    Two sites with good information:
    Http://www.portlandbolt.com/technica...que-chart.html
    http://www.meritorhvs.com/MeritorHVS_Documents/TT3.pdf (about half way down)
    Last edited by Madferraristi; 02-11-2011 at 04:30 PM.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •