Tigerstripe40
SILVER Star
Putting my FJ40, back together, I got the knuckle put back together.
As I am putting the caliper on I wound up stripping the threads of the upper bolt out of the knuckle.
The thread seems to be unusual. It's an M12 bolt, but I think it's a 1.25 thread. I have M12x1.5 and M12x1.75 taps but not the one I need.
I have another knuckle, but I had put the Trail Gear magnum studs (ARP 2000 material IIRC) in the 'new' knuckle and used high strength lock-tite with anaerobic activator on the knuckle, so I think those aren't going any where (old knuckle has OEM studs).
I am concerned that heating the studs to break the lock-tite will affect the heat treat of the studs (if any).
I suppose I can drill and tap the knuckle for a 1/2"x13 grade 8 bolt, or I can helicoil to the M12x1.25 threads. Would I be better swapping the knuckle or drilling/tapping the one thats installed? I probably have to tear it back apart either way...
As I am putting the caliper on I wound up stripping the threads of the upper bolt out of the knuckle.


The thread seems to be unusual. It's an M12 bolt, but I think it's a 1.25 thread. I have M12x1.5 and M12x1.75 taps but not the one I need.
I have another knuckle, but I had put the Trail Gear magnum studs (ARP 2000 material IIRC) in the 'new' knuckle and used high strength lock-tite with anaerobic activator on the knuckle, so I think those aren't going any where (old knuckle has OEM studs).
I am concerned that heating the studs to break the lock-tite will affect the heat treat of the studs (if any).
I suppose I can drill and tap the knuckle for a 1/2"x13 grade 8 bolt, or I can helicoil to the M12x1.25 threads. Would I be better swapping the knuckle or drilling/tapping the one thats installed? I probably have to tear it back apart either way...