Front seat bolt size

[v guy]

The 2021 Mach 1 uses 4, T-55 headed bolts, to mount the front seats to the floor pan.......bolts are about 1" long

Does anyone know the thread pitch?

I find no facts regarding these bolts, and replacing them with longer bolts, in the rear set of holes.

Reason:
I want to mount a CMS seat belt harness bar, to the front seat's, rear seat mount holes....the stock 1" bolts sit in a recess, and are likely too short to mount the bar, without a longer stud, and spacer for the recess.

Has anyone actually mounted a Watson, or CMS type harness bar?

With much research, nothing here........ I finally found how the front seat's, popcorn catcher flap, attaches to the seat bottom--the flap has two long elastic straps, mounted under 2 electrical connectors, holding them in place.

I needed to know that , as I want to attach sub straps to the CMS bar without cutting a slot in the flaps.

thanks in advance , for the bolt info, if it is known.

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[GTP]

You will need the T50 to remove the OEM bolts anyway, so why not just pull one of the fronts to check the thread spec yourself?

 

[v guy]

I am going to do just that.

In the meantime, and I had missed it........ CMS recommends mounting the harness bars, UNDER the seat rails/platform; sandwiching the plate under the seat.

I will still determine the bolt thread size, and post it.

 

[Mach1man]

I am going to do just that.

In the meantime, and I had missed it........ CMS recommends mounting the harness bars, UNDER the seat rails/platform; sandwiching the plate under the seat.

I will still determine the bolt thread size, and post it.

I ran into the same problem when trying to install a Watson harness lap belt mount. I removed rear bolts, sliped mount under seat rails. Then found bolts came up short. I spent 2 weeks trying find longed bolts, no luck. Then the lights came on I removed both front seat bolts. Allowing me to tilt seat back just enough to catch rear threads. Give it a try

https://shop.watsonracing.com/HARNESS-LAP-BELT-MOUNT-p/wr-harnessmnt.htm?CartID=1

 

[v guy]

Ok,

Stock rear seat bolt is:
10mm x 1.50 pitch 1.2" long, or 30.45mm long.

I purchased 2, 10mm x 1.50 pitch 42.54 mm length. Looks like it will accommodate the Watson 1/4 plate, as it measures about 12MM 1/2" longer, but needs a 1/8 " washer under the hex head to spread the load.


The 1/8" thick CMS plate...I I got two 37.46 long 10mm x 1.50 pitch bolts. Looks like it will be enough.

Fastenal

 

[WD Pro]

Ref fastener type :

I think earlier cars might have been, but my 2020 defo wasn’t :

It was one of these :

WD

From here :

https://www.mustang6g.com/forums/threads/seat-mount-bolt.193229/#post-3875222

WD

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