Cox special 045 tether car question

I guess 8-24 doesn’t exist or oddball, I’m stumped.

Do you guys have a pitch gauge? They usually reside in good tap and die sets.

there is a 8-32 and 8-36 but i can only find them in crown and low stgth machine sc. nuts https://www.mcmaster.com/crown-nuts/low-strength-steel-cap-nuts-9/  I don' know what that nut on Cranks car is called ?  Look Here but metric https://www.mcmaster.com/machine-screw-nuts/ scroll to bottom    

Cribbs74 wrote:Do you guys have a pitch gauge? They usually reside in good tap and die sets.

I got one somewhere, don't know why i can't find anything. I almost dropped the nut into the abyss under my bench.

The major diameter is .161" I would try 8-36 next but have no tap that size. The problem with a pitch gauge is only two threads on the end of axle and my eyes aint that good anymore.
They were made in 1950.

Thanks for checking. The 0ne size I haven't tried is an 8-36. Don't have that die. I did try some metric dies and ran into the same situation. Like you said there's only 2 threads so it's hard to pitch gauge it. I'm going to try and order an 8-36 die. I'm not sure what else to try. The wheel are on the car now with the 8-32 threads. I screwed on the stock nuts until they stopped hand tight. I could leave it like that but not my work ethic. Hard to find some of the parts for these cars.

I took the front axle out of my Cox Special and took the following measurements
     
Axle overall length       4.52”
Between axle nuts*     4.32"
Axle dia                     3/16”  
Thread dia           0.1633"  
Threads per inch  36

* axle nuts finger tight

Thread measurement of No 8 UNF from Engineers Black Book. Very handy book



      Tpi             major                  effective            minor          minor      Tapping                clearance
                        Dia                     dia                    dia            Ext dia     int drill size mm   drill size mm

No 8 36            0.1640            0.1460              0.1299       0.1339      3.50                 4.30

Looking at those measurements I think you’re on the right track Rosco,  No 8 -36 UNF.

Also, the Prop Rod had the same setup before they went to the horseshoe circlip.



The bonus is the front axle is about 5¼” long so can be cut down to suit.
The part number for the hub nuts is 910 (pkt of 4).




Keep an eye out for them or a Prop Rod chassis, they turn up occasionally.

Dave

Thank you crankbndr and devenz For all your all your great Help. I didn't have too many choices left on die size. I ordered the 8-36 yesterday. Think i"ll order the tap today. I have a prop rod axle but I didn"t want to cut it so I purchased the 3/16" stock. Now I can make lots of axles! I do enjoy working on these cars. Can't afford top shelf ones. Have to make them that way. You all try to have a great new year! Thank you.

Here's A pic. of my 045. I received mine with A bare patina. Most I see are colored. I polished it up. Has someone along the way removed the paint?  .

That model looks good polished, don't know if they came that way. Every time I make a definitive statement about Cox I am usually wrong.
I enjoy fixing them up also and don't care if not factory. Sometimes an old beater is worth fixing up for my shelf queen collection. I don't run em.
Welcome to the party pal!!  

I did a Champion also,

Beautiful job! Looks great. Waiting on new tires, Brake lever and exhaust for the Special. Supposed to Arrive today. This will be no. ten in my car collection. I have to quit buying them dont have anymore shelf space.Will see how long that lasts.

Good we can still find parts either repro or new old stock. I have bought more than one model just to get parts to make one complete.

Thanks Getback for the Mcmaster linc. I ordered the metric 3mm round slotted nuts. Hopefully I can run an 8-36 tap through them so I can put my Prop Rod front axle back together. I used the axle nuts on the 045 special.