78 bucket seat bolt size for seat rails to seat (1 Viewer)

[Curtice]

What are the bolt sizes for the two bolts circled in this picture? I’m having trouble...thought I found it but maybe stripped one...

Is the one on the right where the seatbelt hooks the SAE one? I read something about that but wasn’t sure.
Thanks

 

[Curtice]

Just bumping for some help. If it wasn’t clear from that picture, I am referring to the bolts circled here:

thanks

 

[spotcruiser]

I'll try to ID them tomorrow, Curtice.

 

[KingAir Driver]

Front should be M10, rear should be seat belt SAE thread, 7/16 if I remember correctly.

 

[spotcruiser]

Front bolt is M10 x 1.25 x 50mm
Seat belt is 7/16 x 20 x 1". Obviously, you want grade 8.


Seat belt bolt on the left.

 

[Curtice]

Fantastic! Thanks a ton. I hope I didn’t ruin one side of one seat by trying an M12x1.25 that I thought at first was correct. Will see...

 

[73FJ40]

@Curtice .
I think @spotcruiser meant x 25mm for the M10, not 50mm. I counted about 18 threads, and at a pitch of 1.25, that's only 22mm.

 

[spotcruiser]

Yep. Sorry. Don't know how that 50 got in there. They're both about an inch long.

@Curtice .
I think @spotcruiser meant x 25mm for the M10, not 50mm. I counted about 18 threads, and at a pitch of 1.25, that's only 22mm.

 

[Curtice]

Thanks guys that makes sense. I think I have the M10 bolts from when I disassembled, but can't seem to find the SAE ones. I'll pick some new bolts up just to be sure I have the right ones.

 

[73FJ40]

@Curtice

SAE UNF 7/16 - 20 is supposed to be interchangeable with M11x 1.25. That's probably one reason the Federal Motor Vehicle Safety Standards selected that particular diameter and pitch.