Quick question; what are the size and thread of the 6 bolts that hold the stock bench seat to the floor on a 1948-52 F-1?

 

To remove the seat from my '50 F6 I had to grind the bolts off, they looked like 1/4-20's.

 

They are either 5/16" or 3/8" UNF x 1-1/4" is my bet. There was a thread about them a year or two ago, the p/n is real hard to nail down. Here's for '53's

 

The parts book I have shows the bolts for the 53/ so I can't answer your question without removing one from my truck.

For the 53/ the size is 3/8" -16 x 3/4". I'm pretty sure my 51 seat bolts are bigger than that.

If no one else comes up with an answer, I'll go take one out to measure it.

 

Thanks everyone, I did some testing this morning and found that they are 3/8-24F. My 49 and the 52 are the same.

Mid-Fiftys sells Seat Track stainless steel bolt kits, and they claim the bolts are the same 1948-56. I think I will order a set ($7) to see if they fit.

Meanwhile, I just chased the treads with a tap and then coated a bolt with anti-seize and filled each hole so I can clean the rest of the cab.

 

Just FYI, the bolts that hold the door hinge to the cab are 5/16-24F. I can find ones at local hardware that fit, but they have an allen-head, not the big Phillips-head like factory. Anyone found a good source for factory-like bolts?

 

I get all of my bolts from a company named "Tacoma Screw". I don't know where you are, but any major city would have a nut and bolt company.

 

No one reproduces the exact same 3/8-24 countersunk ovals head Phillips screws

Most make the Allen head and I have seen flat faced countersunk Phillips screws listed as replacements although they are noticeably different if going for a restoration

 

I believe Roy Nacewicz has the correct door hinge screws, as they were used for other things on older Ford cars. They won't be cheap!
Roy Nacewicz Enterprises Ltd - Ford Bolts

 

Comparing them to my 55 chevy I dont think the Ford ones are that much different. As usual the chevy stuff is everywhere so price is low.

https://www.yearone.com/Product/1955-57-chevy/dm258

 

Am I missing some bolts? My 48 F-3 has 4 bolts holding the seat to the floor.
Ed
near Philadelphia

 

My 51 has 5 bolts, 3 on the drivers side and two on the passenger side.

 

There is a side-to-side brace on both sides. I don't recall if that uses the same size bolt or a smaller one?

 

It's the same size bolt. My truck's floor has the holes for the brace on both sides, but only has the brace on the drivers side.

I thought maybe the extra hole was for the right hand drive cabs sent to other countries.

 

Thanks for the info on the door screws, I am going to check out both sources and see what I find, will post results later.