Model A, B & V8

Ford Garage

Dangerous Reproduction Lug Nuts

Here is one style of reproduction Model A Ford lug nut to watch out for. Green is good! Red is bad! Though the nut has the correct stud shoulder relief, the minor diameter of the threaded portion of this nut was made too large for the 1/2-20 stud size.

What this means is that the nut will still screw on the stud okay, but the amount of surface engagement between the nut thread and the wheel stud is greatly reduced and weakened.

Actually the remaining threadform in the poor quality nut is probably stronger than the thread crests on the stud, so as you torque the nut you will deform the threads on the good stud and ruin them first. The terrible quality nut should survive just fine!

Moral of the story: A poor quality lug nut ruins the studs of an expensive brake hub and drum assembly, and makes a dangerous wheel attachment.

Shown above is another common lug nut problem. Original Ford studs are swaged into the drum and have an unthreaded shoulder at the base. The original design lug nut on the left has the correct corresponding relief in the threads to clear the stud shoulder.

The low quality reproduction nut on the right has the threads running all the way to the base of the nut and no relief for the stud shoulder.

Many reproduction nuts are missing the thread relief for the stud shoulder, and the full nut threads will bottom-out on the shoulder before they tighten the wheel to the drum!

Then people think they should add those fabulous (not!) conical wheel nut washers to take up the slack. Another bad idea!

The only thing the conical washers really do is add more mis-fitting interfaces into the joint, and waste valuable thread engagement length of the stud. They make a bad situation much worse. I do not care to ride in any car with conical washers on the wheels.

If you are using the conical washers to try to compensate for wallowed out lug nut holes on any wheel, that is another big red flag! Now you are combining dangerous wheel(s) with 20 dangerous wheel attachments! Seriously?? Get a good wheel (easy to find) and throw away the foolish conical washers and bad lug nuts.

Moral of the story: Use correct wheel nuts having the proper shoulder relief at the bottom, and throw away any wallowed out wheels and the dangerous conical washers while you are at it!

More related information on Ford Garage:

  1. Model A, B & V8 Wheel Stud Removal and Installation Swaging
  2. Model A, B & V8 Wheel Stud Chart
  3. Model A, B & V8 Swage Cutting Tool on
  4. Model A & B Wheel Lug Nut Seat Reamer
  5. Model A, B & V8 KR Wilson Rear Hub Puller
  6. Model A, B & V8 Truing Hubs on A Brake Drum Lathe
  7. Model A, B & V8 Brake Drum Lathe Rear Hub Mounting
  8. Model A & B Cast Iron Front Brake Drum Comparison
  9. Model A 1931 Cast Iron Rear Brake Drum Details
  10. Early V8 Hydraulic Brake Drums for 1932-1935 Wire Wheels

November 2002