67 Firewall Circuit Breaker C06 A1 #9

[big iron]

What size and finish are the screws #9 (3858195) for the firewall circuit breaker?
Bob

[169INDY]

Here is the AMK Data:
Tapping Screws - Hexwasher Head
Phosphate & Oil
#8 X 3/8 HXWA AB PHOS. 20 pk

[big iron]

Jim,
Thanks for the reply.
I wonder why the pilot hole of .125 is specified in AIM for a #8-18 when .136 is now specified?
Is AMK # B-12048 now the accepted replacement for 3858195 as AMK does not offer a direct part # replacement?
Bob

[Petes L48]

Here's the link to the AMK item on their site.  I've seen 1/8" and up, listed as a pilot hole size for a #8 sheet metal screw. AMK uses their own part number, likely because these fasteners were used on multiple makes of automobiles.

https://www.amkproducts.com/search-result/?ser=3858195

[big iron]

Looks like the pilot hole increases with the thickness of the metal.
Do all #8-32 hex screws have the same diameter at the base of the threads? If not then that could explain the different pilot hole sizes in the AIM.
Bob