1972 FJ40 Seat Belt mounts

[SoCal 40]

I am installing seat belts and I think I am using the wrong locations. I think the rear heater mounts to the locations that I am using. Does anyone have a picture of the locations where the seat belts mount to? Just the middle ones. I have the ones on the door sides.

Does the passenger seat belt go around the middle seat?

Cheers

 

[Rochfort]

I am installing seat belts and I think I am using the wrong locations. I think the rear heater mounts to the locations that I am using. Does anyone have a picture of the locations where the seat belts mount to? Just the middle ones. I have the ones on the door sides.View attachment 3830100
Does the passenger seat belt go around the middle seat?

Cheers

I've been trying to figure that out too...

 

[45Dougal]

The seatbelt mountings are about the only imperial bolts / nuts on the whole truck - if you've fitted a metric bolt in there, then you've got it in the wrong hole.

 

[diesellibrarian]

[Edit: sorry, the link was bad. Should work now]

Check out this post on my build thread: 1972 FJ40 Seat Belt Anchor Locations

 

[Living in the Past]

[Edit: sorry, the link was bad. Should work now]

Check out this post on my build thread: 1972 FJ40 Seat Belt Anchor Locations

Driver's side is not correct. It would be in the bolt farther forward. Never owned a 72 that had the emissions tank in the passenger's seat back. Believe the anchor on those moved so the seat belt came between the two seat backs. Guessing I have some good pictures of my 70 model I took when I got a stated value insurance. But the passenger side would be different because it when all the way to the end of the seat.

 

[firemanj92]

With imperial hardware transition month/year 6/70

 

[73FJ40]

I think 7/16-20 UNF and M11 x 1.25 are interchangeable, in ordinary thread class.

 

[Rochfort]

I think 7/16-20 UNF and M11 x 1.25 are interchangeable, in ordinary thread class.

Good to know

 

[Rochfort]

I think 7/16-20 UNF and M11 x 1.25 are interchangeable, in ordinary thread class.

here's my bolt pattern...can't seem to get the passenger side belt that far over.
is there a belt in the middle for that passenger side bench seat?

 

[45Dougal]

I think 7/16-20 UNF and M11 x 1.25 are interchangeable, in ordinary thread class.

They are two completely different sizes - the pitch is about 20% coarser on the metric bolt.

Just because you can force something into a hole, doesn't mean that it belongs in there.

 

[73FJ40]

They are two completely different sizes - the pitch is about 20% coarser on the metric bolt.

Just because you can force something into a hole, doesn't mean that it belongs in there.

Let's see (sorry, USA arithmetic)

7/16 - 20 = 20 threads per inch, 7/16 = 0.4375, 0.4375 x 25.4 = 11.1125mm.

11.1125/11 = 1% difference in diameter.

M11 x 1.25 = one thread per 1.25mm

25.4mm per 1 inch

25.4/1.25 = 20.32 threads per inch

20.32/20 = 1.6% difference in thread pitch..

 

[charliemeyer007]

IIRC at some point in time the seat belt bolt became standardized maybe in the 2000's.

 

[45Dougal]

Let's see (sorry, USA arithmetic)

7/16 - 20 = 20 threads per inch, 7/16 = 0.4375, 0.4375 x 25.4 = 11.1125mm.

11.1125/11 = 1% difference in diameter.

M11 x 1.25 = one thread per 1.25mm

25.4mm per 1 inch

25.4/1.25 = 20.32 threads per inch

20.32/20 = 1.6% difference in thread pitch..

Standard pitch for M11 is 1.5mm, and M11 Fine pitches are 0.75mm and 1.0mm.

While you can find M11 x 1.25, they are like rocking horse droppings by comparison.

 

[73FJ40]

I only claimed the 7/16-20 and M11x1.25 were interchangeable.

Note that other OEMs uses the M11 for their seat belt fasteners. I speculate that the NHTSA rule requiring seat belt anchors to use 7/16-20 or 1/2-13 ("or equivalent") permitted the metric M11x1.25 specialty thread for metric OEM's.


Rocking Horse droppings spotted:

 

[45Dougal]

Yea they are out there. Just much less common.
Tbf, you'd be hard pressed to find any M11 fastener in a normal hardware shop in any pitch.
M10 and M12 on the other hand are everywhere.