03-19-2023, 05:11 PM | #21 |
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Re: Rear axle nut
One leg is bent up and over the facing of the nut, the second leg is just tapped back slightly, towards the bearing.
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03-19-2023, 05:47 PM | #22 |
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Re: Rear axle nut
The rear axle thread/nut I believe to be one of those "unusual" threads. Today the fit/tolerance would be a matter of "thread class" - although I don't think Ford had brought it to that level of standardization.
This akin to the threads/bolts in the "punkin" which are just a "skosh" (technical term) larger than the USS - and for which a lot of people have to use "sealant" My experience with "recutting" axle/hub thread is that a "fair" amount of material is removed by the die in the recutting. Enough to make me concerned for "thread fit" and wonder if I'm not making the thread more subject to tension failure? Thread files MAY help reduce this. So maybe might using a tap & die in the "Little Giant" pattern - which can be adjusted for oversize nicely. BUT - to solve my problem henceforth I bought a "thread restorer" which is made to the purpose, and "restores" the threads by compression. Shown below. This one is on Ebay, so the pix won't last, but the tool is available "Buy it Now" at a good buy. Some have opined that the axle/hub threads were originally "rolled." This is a distinct possibility. IMHO, this is the proper tool for a rear axle thread restoration. Joe K
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03-19-2023, 08:17 PM | #23 | |
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Re: Rear axle nut
Quote:
The British system was very similar (BSW and BSF) and the metric system also has a coarse and fine thread standard.
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03-20-2023, 02:44 PM | #24 | ||
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Re: Rear axle nut
Quote:
What you say is doubtless true, but add in the additional variable of "tolerance." Fastenal in their most excellent site on thread design addresses this. https://www.fastenal.com/content/fed...s%20Design.pdf I'll take a couple of paragraphs which show the effect. This does not cut/paste well. Quote:
And while UNF/UNC were used for the vast majority of Ford fasteners, it is not impossible for Ford to have "deviated." After all, Ford probably produced (or at least tightly controlled) fasteners for critical use. As I say, recutting an axle thread with a non-adjustable die results in "substantial" chip production. This being a "typical" TRW or better quality die. I imagine made to produce the class 2 fit. I won't be doing that again. Any more than I will use commercial, even stainless steel cap screws on the punkin. Permatex is best applied knowing the seal is probably already "tight." Joe K
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03-20-2023, 05:55 PM | #25 |
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Re: Rear axle nut
Joe, I was responding to your comment that they were "unusual" threads
"The rear axle thread/nut I believe to be one of those "unusual" threads. " I make no comment class of thread but find your comments about cutting the 9/16 thread quite reasonable. Mine were done on a lathe (not with a die) by a very experienced operator. The fit with the nut is quite good. PS I am not trying to be confrontational or augmentative here.
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03-20-2023, 11:33 PM | #26 |
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Re: Rear axle nut
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- 1 A , common threaded rod ( I knew that this was pretty loose !) - 2 A, common hardware fasteners - 3 A, think "Allen" cap screws and the like Joe B |
03-21-2023, 12:48 AM | #27 |
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Re: Rear axle nut
Threads come in different "classes" or tolerances.
For talking here we will talk about common threads used in automotive applications, NOT close tolerance types. Standard die nuts are made to cut standard size threads. These are the die nuts found in hardware and tool supply stores. They are guaranteed to cut standard size threads, NOT undersize and NOT oversize. A thread chaser will NOT cut a standard thread, it will be oversize for a die and undersize for a tap. These will normally clean some rust and dirt out of threads, BUT, they will NOT restore a thread to new clean metal dimensions. Another thing to remember is a dirty thread CAN NOT be torqued to an accurate value. If the thread has been damaged, it will cut SOME of the high spots off but IT WILL NOT RESTORE THE LOW SPOTS to original. A die nut is required to restore the high spots to proper dimensions. Nothing can be done for the low spots. This may or may not leave the thread capable of reaching the designed torque for the application. Usually if metal has been lost from a thread for any reason, it will not carry the load it was designed for. This is especially true in the case of old Ford axle threads. What came from the factory worked fine. There are MANY improvements that have been developed over the years by the racing industry to use both for street and racing. I will venture to say ALL of the pertinent info has been posted on this and the HAMB forums several times along with all of the old wive's tales and bad info. |
03-21-2023, 08:54 AM | #28 |
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Re: Rear axle nut
I only go about 90-100ft.lbs. 120 seems too much for 90 year old threads.
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03-21-2023, 12:37 PM | #29 | ||
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Re: Rear axle nut
Quote:
And Ford MAY HAVE pushed the quality boundary, as they did many times even in other areas such as Johannson Blocks and dimensionalities. https://en.wikipedia.org/wiki/Gauge_block Quote:
Joe K
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03-22-2023, 10:04 AM | #30 |
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Re: Rear axle nut
Yes and even 85-95 may be enough depending on hub and axle key condition, torque wrench used for small '# increments approaching the end setting. Supposedly factory didn't use a torque wrench until later years , and some mechanics advise to go back and recheck after driving for some mileage like for wheel studs..
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03-22-2023, 05:56 PM | #31 | |
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Re: Rear axle nut
Quote:
As for the axle nuts, I fitted the rear hubs on one of my cars recently and checked them after only about 8-10 miles. I got enough out of them that I am pleased that I did. We have a longer drive coming up soon so I will make sure I drive it some more and check them again before we go. After checking yet again on our return, I think I will be able to call them good. We'll see.
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03-22-2023, 07:19 PM | #32 |
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Re: Rear axle nut
Interesting subject, fasteners.
I was looking thru the 1919 Machinery Handbook Not sure when the S.A.E specs came into existence except to mention it replaced the A.L.A.M specs of April 1906 (association of licensed automobile manufacturers) So, Class fits did not exist in the SAE specifications. Specs given as the body of the fastener to be .001 less than the nominal diameter, nor smaller than .002 smaller than nominal dia. That is not the case today at all. The nut to be .002 - .003 larger than nominal dia (major dia of thread) materials for screws and plain nuts steel min 100,000 psi tensile with elastic limit of 60,000 psi castle nuts to be case hardened. John
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05-21-2023, 04:15 PM | #33 |
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Re: Rear axle nut
Bruce, the linked page shows "out of stock". Looks good though.
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05-21-2023, 11:06 PM | #34 |
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Re: Rear axle nut
If you are interested in the Lang Thread Chaser set you can get it from Amazon.com https://www.amazon.com/s?k=Lang+Tool...f=nb_sb_noss_1
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