The Ford Barn

Al 29Tudor · 12-13-2021, 10:23 PM

What size are the Flat Head Locking nuts ?
I'm measuring about .612 diameter for the stud the locking nuts go on, Too small for a 5/8 - 18 thread. I'm working on a friends car without instructions, the locking nut are missing and I don't know what size they are.
Does know what size they are and where I can get them.
Thanks,
Al

Richard in Anaheim CA · 12-14-2021, 12:44 AM

Flathead is from "down under". Nut is probably metric.

Y-Blockhead · 12-14-2021, 01:17 AM

Quote:

Originally Posted by Al 29Tudor

What size are the Flat Head Locking nuts ?
I'm measuring about .612 diameter for the stud the locking nuts go on, Too small for a 5/8 - 18 thread. I'm working on a friends car without instructions, the locking nut are missing and I don't know what size they are.
Does know what size they are and where I can get them.
Thanks,
Al

Does not the FHT wedge screw into the same hole on the backing plate as the stock wedge? If so it would have the same thread, ⅝-18 thread.

nkaminar · 12-14-2021, 08:12 AM

5/8-18. Instructions are on the internet. Google "flathead ted brake floater kit"

The bolt or stud will sometimes be a little smaller than the nominal size. 5/8 is .625. Your measurement of .612 is close enough. The backing plates have to be tapped 5/8-18 for the FHT kit to fit. Ford had a different standard for the thread size. The modern standard is slightly larger.

Al 29Tudor · 12-14-2021, 08:16 AM

Richard and Y-Blockhead thanks for your responses. This is what I'm learning - the info on line says to run the very short special tap through the back plate to "clean the threads". I think that special tap is cutting metric threads to accept the FHT studs. And so I need the metric jam nuts close in size to the 5/8-18 jam nut.
It seems to be coming together, thanks for your comments.
Al

Y-Blockhead · 12-14-2021, 09:47 AM

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Quote:

Originally Posted by nkaminar

5/8-18. Instructions are on the internet. Google "flathead ted brake floater kit"

The bolt or stud will sometimes be a little smaller than the nominal size. 5/8 is .625. Your measurement of .612 is close enough. The backing plates have to be tapped 5/8-18 for the FHT kit to fit. Ford had a different standard for the thread size. The modern standard is slightly larger.

The backing plate is already tapped ⅝-18. The stock wedge is threaded ⅝-18. Bratton's catalog states they are ⅝-18. https://www.brattons.com/USA-BRAKE-A...ductinfo/2780/ I did not retap my backing plates and the FHTs kit fit fine.

The kit comes with a "thread cleaner is used to clean out rust and debris from the top adjuster hole to help simplify the fitting of the kit". Note it says "thread cleaner", not tap.

Al 29 Tudor, the instructions can be found on Snyder's online catalog. https://www.snydersantiqueauto.com/c...structions.pdf

nkaminar · 12-14-2021, 12:18 PM

Not metric. I used a 5/8-18 tap which worked fine. If a 5/8-18 thread cleaner (chaser) works then use that. The thread chaser would not have worked on my backing plates as the threads were too tight. The threads on my backing plates were in good shape with no rust so I concluded that Ford used a different thread standard.

Al 29Tudor · 12-16-2021, 02:48 PM

Thanks to all for your input I do appreciate it. It's so helpful to hear your experiences. Now to find 5/8 - 18 thin jam nuts.
Thanks again, Al

nkaminar · 12-16-2021, 03:20 PM

Package of 25 for $8.33 at McMasters Carr. See https://www.mcmaster.com/nuts/thread...in-hex-nuts-8/

12-13-2021, 10:23 PM	#1
Al 29Tudor Senior Member Join Date: Jul 2012 Location: Venice, FL Posts: 648	Flat Head Ted Locking nuts What size are the Flat Head Locking nuts ? I'm measuring about .612 diameter for the stud the locking nuts go on, Too small for a 5/8 - 18 thread. I'm working on a friends car without instructions, the locking nut are missing and I don't know what size they are. Does know what size they are and where I can get them. Thanks, Al

12-14-2021, 12:44 AM	#2
Richard in Anaheim CA Senior Member Join Date: May 2010 Location: Anaheim California Posts: 551	Re: Flat Head Ted Locking nuts Flathead is from "down under". Nut is probably metric.

12-14-2021, 08:12 AM	#4
nkaminar Senior Member Join Date: Jan 2012 Location: Western North Carolina Posts: 3,900	Re: Flat Head Ted Locking nuts 5/8-18. Instructions are on the internet. Google "flathead ted brake floater kit" The bolt or stud will sometimes be a little smaller than the nominal size. 5/8 is .625. Your measurement of .612 is close enough. The backing plates have to be tapped 5/8-18 for the FHT kit to fit. Ford had a different standard for the thread size. The modern standard is slightly larger. __________________ A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past.

12-14-2021, 08:16 AM	#5
Al 29Tudor Senior Member Join Date: Jul 2012 Location: Venice, FL Posts: 648	Re: Flat Head Ted Locking nuts Richard and Y-Blockhead thanks for your responses. This is what I'm learning - the info on line says to run the very short special tap through the back plate to "clean the threads". I think that special tap is cutting metric threads to accept the FHT studs. And so I need the metric jam nuts close in size to the 5/8-18 jam nut. It seems to be coming together, thanks for your comments. Al

12-14-2021, 12:18 PM	#7
nkaminar Senior Member Join Date: Jan 2012 Location: Western North Carolina Posts: 3,900	Re: Flat Head Ted Locking nuts Not metric. I used a 5/8-18 tap which worked fine. If a 5/8-18 thread cleaner (chaser) works then use that. The thread chaser would not have worked on my backing plates as the threads were too tight. The threads on my backing plates were in good shape with no rust so I concluded that Ford used a different thread standard. __________________ A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past.

12-16-2021, 02:48 PM	#8
Al 29Tudor Senior Member Join Date: Jul 2012 Location: Venice, FL Posts: 648	Re: Flat Head Ted Locking nuts Thanks to all for your input I do appreciate it. It's so helpful to hear your experiences. Now to find 5/8 - 18 thin jam nuts. Thanks again, Al

12-16-2021, 03:20 PM	#9
nkaminar Senior Member Join Date: Jan 2012 Location: Western North Carolina Posts: 3,900	Re: Flat Head Ted Locking nuts Package of 25 for $8.33 at McMasters Carr. See https://www.mcmaster.com/nuts/thread...in-hex-nuts-8/ __________________ A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past.