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Old 07-09-2020, 06:46 PM   #1
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Bench Seat Rail Bolt Size M12x1.75?

I took some benches out and I plan to use the existing bolt holes to secure some cabinets to the floor. I took the bolt to home depot and it's a m12-1.75 according to the sizer so I bought a bunch of m12-1.75 bolts and I can only screw in a few turns, and it's stuck, any ideas? The stock bolt seems tapered on the end of the bolt...any help appreciated.
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Old 07-09-2020, 08:00 PM   #2
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That's because they are not metric. That's exactly what happens.
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Old 07-09-2020, 10:31 PM   #3
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Really? any idea what size they are? the seat belt floor tie down is like 7/16". At Home Depot, when I use the screw size thing, the seat rail bolt screwed in m12x1.75 perfectly
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Old 07-10-2020, 08:56 AM   #4
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I can confirm on my 2011 that all of the seat mounts are M12x1.75. The mounting holes are through holes--it's possible that you have crud that's built up inside the holes from the underside.
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Old 07-11-2020, 05:39 AM   #5
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Quote:
Originally Posted by Kibo View Post
I can confirm on my 2011 that all of the seat mounts are M12x1.75. The mounting holes are through holes--it's possible that you have crud that's built up inside the holes from the underside.
Very possible---I'd buy a cheap thread chasing tap, clean out the holes and lightly lubricate the new bolts with something like anti-seize, torque accordingly.
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Old 07-11-2020, 08:54 AM   #6
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Don't know why SMB would use metric fasteners on an american made vehicle converted in the USA?
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Old 07-11-2020, 09:37 AM   #7
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M12x1.75 are Ford's stock size on my 2002 for securing seats to the floor mounts. I did have to clean up some of the holes that hadn't been used with a tap when mounting a seat in a new position. Easy-Peasy.
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Old 07-11-2020, 11:03 AM   #8
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Don't know why SMB would use metric fasteners on an american made vehicle converted in the USA?
I think the OP is referring to the bolts used to secure the stock bench seats from the factory, not the SMB installed benches. The bolts are metric and screw into metric threaded holes in the van floor normally with TORX 55 bolts.

Somewhere back in the mid 1970's the US automotive industry started incorporating metric fasteners into the cars and engines. Not everything on the vehicle was metric but a mixture of metric and SAE which kept things fun!
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Old 07-26-2020, 11:38 AM   #9
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Could it be that the threading is different? Sometimes there are different tighter thread patterns on some bolts vs others based on the inended use
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