Seatbelt Bolt Question....

[Mach Tuck]

No not that! The bolt that mounts the seat belt into the seat. I was in the middle of doing the seat bushing and seat tilt mod on the passenger seat when I had to go out of town for work. When I got back and finished installing everything I seem to have misplaced the bolt that mounts the seat belt into the seat. Real OEM doesn't even list one. Anyone in the Cartel happen to have one they can spare?

[Terry F.]

Dave,

Home Depot, down the street, has a surprising stock of SAE and Metric bolts. But, I was there about two weeks ago and the area was in disarray. Nothing where it belonged, Christmas frenzy aftermath. Still, maybe give it a try....

Terry

[BimmerBreaker]

I might have some but I would spend like 2 hours digging through bolts to find the right one.

Home Depot is good, or a local junkyard? Maybe take the bolt from the other seat and take it to the junkyard to compare as other BMW bolts from the same area may be the same size.

[rf900rkw]

I would not recommend hardware store bolts on the seat belts. The right bolt will have a shoulder for the belt, a thinned head, and be the correct hardness.

- - - Updated - - -

My best guess would be 72118411475

[bplease]

I'll do it.
You removed the seatbelt!?

[rf900rkw]

Yep. Tis easier than trying to change the bushings with the seat still in the car tethered by the belt.

[robb1887]

I would not recommend hardware store bolts on the seat belts. The right bolt will have a shoulder for the belt, a thinned head, and be the correct hardness.

- - - Updated - - -

My best guess would be 72118411475

May also be pc 3 of same diagram. 52108212208

[bplease]

Hm I get it but it was very easy to do with it attached.

You can always see if you have a fastenal in your area.

[Vintage42]

... easier than trying to change the bushings with the seat still in the car tethered by the belt.

Many of the bushing DIYs say to remove the seat and set it beside the car with the seat belt still attached, as shown in the first minute of this video. That's the way I did mine.

https://www.youtube.com/watch?v=DM4K...related&search

[rf900rkw]

Try it in a coupe some day. The seats are a big PITA to maneuver without damaging anything without the tether. Believe me, I'm a master of avoiding unnecessary disassembly. I remove the belt on coupes, and have done roadsters both ways.


Robb I may be a mistaken, but I took the "filllister head" and listing a matching nut to mean it wasn't the bolt we are seeking.

[Mach Tuck]

I've tried Home Depot and the Local Ace Hardware and they have cheap M10's and M12's but no M11's and nothing in grade 8 bolts. The driver side bolt wouldn't fit in the M10 1.5 and was way too loose in the M12 1.5 even if they were grade 8. I'm still looking.

It was way easier to do the bushings and tilt mod with the seats out. I could imagine tearing the interior up doing it with the seats in.

Thanks for the part numbers, I'll look into them.

I'm still open if someone has one laying around though.

- - - Updated - - -

May also be pc 3 of same diagram. 52108212208

Its a bolt not a fillister head screw.

- - - Updated - - -

I would not recommend hardware store bolts on the seat belts. The right bolt will have a shoulder for the belt, a thinned head, and be the correct hardness.

They recommend grade 8 bolts.


- - - Updated - - -

I would not recommend hardware store bolts on the seat belts. The right bolt will have a shoulder for the belt, a thinned head, and be the correct hardness.

- - - Updated - - -

My best guess would be 72118411475

BMW Parts said that is the bolt for the B Pilar and not fully threaded as the one is that I took off the drivers side for comparison. BMW says even if I want to try it all of their stock is in Germany. The Real OEM pic just shows the end of the seat belt with no matched bolt.

[rf900rkw]

That would be because they are 7/16-20. And much to my surprise, they aren't shouldered; full thread all the way down and though the belt eyelet.

Ask your airframe mechanics if they would consider using SAE Gr8 in any safety related area. Especially ones sourced from a hardware store. Gr 5 would be better in this application, though if I was forced to find something, I would go to my mil-spec bins. You want the over-stress yield characteristic to be bend, not break. To be honest, the size of the bolt compared to the mild steel flange on the seat frame probably makes this a moot point. But I prefer to do it right.

[Randy Forbes]

Yes, BMW weirdness; outer bolt is SAE and inner is Metric. Nade this discovery way back during the installation of some Simpson harnesses.

[BimmerBreaker]

Red seems to have no part # and the blue one (#3) seems wrong since that is a flathead screw with a nut. But is there even a flathead screw with a nut in that area? 3 is not the one you need I don't think

What about 11119148303 ? Pulled that # from an E36 M3 diagram
Doubtful but could it be 52108399598 ?
Honestly the problem I'm having now is the diagrams are not clear enough and there aren't pictures of these parts anywhere. Maybe take a list of the few possible correct part #'s to the dealership and have em pull em out for you to compare? Heck if you just go tell em what you need they may know.

After some further research I think 11119148303 is most likely correct. Also sounds correct based on what you said about what fit from Home Depot. 11119148303 is an M10 torx

[Mach Tuck]

That would be because they are 7/16-20. And much to my surprise, they aren't shouldered; full thread all the way down and though the belt eyelet.

Ask your airframe mechanics if they would consider using SAE Gr8 in any safety related area. Especially ones sourced from a hardware store. Gr 5 would be better in this application, though if I was forced to find something, I would go to my mil-spec bins. You want the over-stress yield characteristic to be bend, not break. To be honest, the size of the bolt compared to the mild steel flange on the seat frame probably makes this a moot point. But I prefer to do it right.

I tried 7/16-20 and it was close but a little loose also. I put a micrometer on it and it measures 11mm/.43" major diameter with a negligible shoulder. I totally agree. The A&P's I know aren't that into heavy airframe structures to have bins of AN bolts this big laying around, they're not cheap!

There is a Fastenall not too far away I'm going to try them tomorrow.

+1 On do it right!!

- - - Updated - - -

Red seems to have no part # and the blue one (#3) seems wrong since that is a flathead screw with a nut. But is there even a flathead screw with a nut in that area? 3 is not the one you need I don't think

What about 11119148303 ? Pulled that # from an E36 M3 diagram
Doubtful but could it be 52108399598 ?
Honestly the problem I'm having now is the diagrams are not clear enough and there aren't pictures of these parts anywhere. Maybe take a list of the few possible correct part #'s to the dealership and have em pull em out for you to compare? Heck if you just go tell em what you need they may know.

After some further research I think 11119148303 is most likely correct. Also sounds correct based on what you said about what fit from Home Depot. 11119148303 is an M10 torx

It's not a Torx although that really doesn't matter, but I am still thinking 11mm.

Going to try Fastenall tomorrow. I'll let everyone know what I find.

[kojohns]

Think I found a spare in my box-o-bolts, let me know if you want it sent priority tomorrow... Would be there by Friday

http://s1247.photobucket.com/user/ko...baetv.jpg.html

[Mach Tuck]

Think I found a spare in my box-o-bolts, let me know if you want it sent priority tomorrow... Would be there by Friday

http://s1247.photobucket.com/user/ko...baetv.jpg.html

Thanks for the try but that's not it. That looks like the bolt for the B Pillar. I really appreciate the try though

[kojohns]

So which colored circle on the above diagram? Must be misunderstanding what you're looking for.

What I pictured is the red circle bolt on my passenger seat

[Mach Tuck]

So which colored circle on the above diagram? Must be misunderstanding what you're looking for.

What I pictured is the red circle bolt on my passenger seat

That's really odd. The bolt that I lost and the bolt in the drivers side are longer with no shoulder. My only guess would be M seat attachments are a little different.

[kojohns]

May be... I didn't back off my bolt to verify the collar, but this looks like it:

http://s1247.photobucket.com/user/ko...bdosk.jpg.html

[rf900rkw]

My info wasn't a guess. I took the bolt out of my roadster that snug in the garage. It looked of 7/16-20, I ran a die down it to make sure. However, when everything is converted to inches

7/16 = 0.4375 dia 0.050 thread spacing
M11x1.25 = 0.433 dia 0.049 thread spacing.


I'll loan you the coin to flip. And buy you a beer if you actually find a M11x1.25

[kojohns]

Well, let me take it out and go back to the bolts bin to match... May still have it

[kojohns]

I was definitely wrong... But the bad news may be that this bolt may be supplied as part of a replacement seat belt rather than an independent part # from BMW? as there is a spring steel lock washer on mine that very securely holds the bolt into the belt mounting clip:



Google Image searching the Seat Belt part # 72118412073, I see lots of pictures with the bolt still attached to the belt:

[Knowthebattle]

I say take the seat into home depot and find the bolt. It's a T50 size according to Pelican Parts. I don't know if that helps....

- - - Updated - - -

Also look under the seat.....It may be there.....And where you were working on the seat...under the couch...entertainment stand.....

[Mach Tuck]

My info wasn't a guess. I took the bolt out of my roadster that snug in the garage. It looked of 7/16-20, I ran a die down it to make sure. However, when everything is converted to inches

7/16 = 0.4375 dia 0.050 thread spacing
M11x1.25 = 0.433 dia 0.049 thread spacing.


I'll loan you the coin to flip. And buy you a beer if you actually find a M11x1.25

I may take you up on that coin!

- - - Updated - - -

I say take the seat into home depot and find the bolt. It's a T50 size according to Pelican Parts. I don't know if that helps....

- - - Updated - - -

Also look under the seat.....It may be there.....And where you were working on the seat...under the couch...entertainment stand.....

It is definitely not in the car. with the seat tilt mod it's pretty easy to see under the seats, seat rails, etc. I guess I'm going to have to scour the work bench and shelves. Here it the one from the drivers side: