Taps and dies

[Grant Bowker]

I'm glad we've returned to the original pont of the thread.
Threads, taps and dies.
I assume you've sought out tables of the diameters and threads per inch for the various threading standards. BSF, SAE fine and coarse, whitworth etc are all decribed on the net. Most of the standards are different enough that careful measurement will let you tell which set of threads your example fits into. I would be surprised if there were a metric thread on a carrier so that should narrow the field a bit. Normally for the larger threads like yours I actually count the number of threads in an inch rather than measuring one pitch and taking the inverse, it reduces the number of ways I can get it wrong. Measuring outside to outside on the male thread is usually close, but a bit smaller than the thread size. On Chev CMP trucks I don't recall meeting any bolts that had to be measured to 1/32 inch, I think 1/16 is the smallest step between sizes. Anything is possible but unless there is a special need I think they would have stayed with similar increments as "standard" practice on carriers. Be cautious on how much of what I said above you take as gospel I don't actually have a carrier for experience.

[Lynn Eades]

If you google "thread data charts", Go to the one that says just "thread data charts". There is a list that says British fine (BSF) in there under the .750"Dia. (3/4") it says there are 12 tpi (teeth per inch) That is the thread on your spring rods.
Like I say, your axles are a special thread. Measure the dia of the thread, and count the threads or check with a gauge. Then hunt around the various thread charts, until you find what it is. It is a very fine thread for the dia. (it may be something like a "cycle" thread.
As far as basics go the steel in your carrier is in metric sizes, but none of the threads are.
All the other threads are BSF(British) except for the ones in the Ford componentary(engine gear box diff)which are almost all UNF(American)

So all the countersunk screws(flat or round head) in the hull etc are BSF.,the majority of which are 5/16. BSF.,3/8 BSF.,and the screws in the tow eyes, are 7/16 BSF.
All the wheel bearings are metric (6000 series) except the fan extention which are imperial sized. I cannot remember what the one is, at the bottom of the steering column(I think imperial) If I recall correctly the flat Tecalamite grease nipples are also BSF.
As far as you axles go, I would take all the damaged axles, and nuts with me, when visiting your friend, because I think you will be hard pressed to find a set of dies, and a die nut or a tap to suit. They will need to be repaired on a lathe, even better if your friend has a suitable thread chaser.
I Hope that helps, and best of luck with your project.
Maybe you can let us know how you've got on with the various issues you have to work through.

[Aidan]

LOL Little Boy don't get mud on your face lynn , I heard stories about you . I know a bigot when i see one.
AIDAN in the USA!

[rob love]

Originally Posted by Aidan

LOL Little Boy don't get mud on your face lynn , I heard stories about you . I know a bigot when i see one.
AIDAN in the USA!

Big Mike?? Is that you?

[Aidan]

BIG Who?

Aidan

[Philliphastings]

Could we all please exercise a little restraint and stick with the core of this thread which is both informative and helpful - ie carrier thread forms.

Cheers

Phill

[Snowy]

I regularly see used BSF taps and dies at my local fleamarket, for quite reasonable prices. They are used, of course, but for thread chasing and low-frequency use they are just fine. I have a set of UNC and UNF ones I acquired this way. I also see them at car swap meets where there is usually a bigger selection too.

Must say I agree wholeheartedly with the sentiments about McMaster-Carr and their rather insular attitude.

Steve.