The diameter the new screws is .2135 the old screws .2405. That's a difference of .027, over 10 percent to the bad. In my mind the old screws started out much stronger. Are the new screws OK?
Bob, there are two different screws available. One is for use with original ring gears, the other with reproduction ring gears. You need to pair the two up to get a satisfactory fit.
Hope this helps.
Allan from down under.
Original Ford Magnet clamp screw.
Thanks for sharing your knowledge. The thread pitch is 24 on the new and old. This is a 1920 motor, maybe these were after market from back in the day.
This is slightly off the issue, but there have been discussions about the thread diameter. It has been claimed that the drawings indicated # 14 screws however with a closer look at the drawings the screw designation is 1-4. The OD is listed as max .242 this would allow the appropriate clearance for a 1/4" machine screw. Therefore I don't believe the screws were ever #14 as claimed.
Looking at Ron's Ford drawing, both numbers are right. The trick is the threaded end is upset to a larger diameter than the shank of the screw.
The new screws go into the ring gear with a nice fit. The smaller shank diameter was my concern.