I did a little research Monday at the archives. The head size on the new style driveshaft roller bearing housing changed from 5/8 to 9/16 across the flats on June 5, 1924. For those who have tried it, you can't get a socket on the 5/8 style.
Thanks for that date of change, good info.
This early housing (1923) used the 5/8" head hex bolt and you do have to use a open end wrench.
Later, this one '27 with 9/16" head hex bolt easy to use a box wrench or socket!
Have a mixed set on my 26, four are 5/8 and two are 9/16 heads.
I bought a bunch of driveshaft bolts at Chickasha and did notice the difference in the head size on a few of them. The guy was leaving on the 2nd day and was getting rid of cans of bolts and I got a bunch for $ 2.00. And a lot of misc. T bolts to boot!
Nice to know it because of a Ford design change. And yes you can't get a thin wall socket on a 5/8 either. I did try it to no avail.
I wonder how they kept up on the assembly line using open end wrenches on the bolts!
Can one of you tell me what kind of thread these bolts [studs ] are .
Ive never had a problem getting a socket on the 5/8 bolts.
13/32" x 16 thread, hex head bolt, length 4 5/8".
Uses a lock washer under the hex head.
Adam, try it again! A socket will definitely not work. Of course if the bolt is not connected to the spool, of course you can get a socket on it!