This is the place where the majority of the warbird (aircraft that have survived military service) discussions will take place. Specialized forums may be added in the new future
Tue May 28, 2019 6:21 pm
H, I'm after the modern MS - number that replaced the old AN7502-1 wheel nuts and their associated AN AN7503-1 washers. I haven't been able to tie-up the suffix for the -1 number to the current range of MS21045 nut or the MS21258 washer series. Does anyone have the exact new suffix for the old -1 parts? Many thanks.
Tue May 28, 2019 9:34 pm
AN7502 was superseded by MS21025. Dash umbers should be the same.
Wed May 29, 2019 1:23 am
Yes, I had understood that the suffix would remain constant, however, no-one seems to list a -1, (the lowest dash number I can find a reference to appears to be a -15 in the MS21025 range) and the closest physical dimension match seems to be a 23. Unusually I can't find a direct interchange chart.
Wed May 29, 2019 12:22 pm
C model Mustang uses a AN7502-1 nut on the main gear, The P-40M and N as well as a Stearman use a 32A510-1 on the main gear. Couldn't find the thread info on the Mustang axle, but the P-40 and the Stearman are threaded 1 7/16ths. I'd suspect that the MS21025-23 is the nut you are looking for.
Wed May 29, 2019 2:17 pm
I looked around for a conversion and found nothing for a -1 size either.
I did find an old FAA letter where an AN7502 axle nut had failed on a Convair airliner, and was found to have a tensile strength of 87,000 PSI. It was recommended to use the newer MS21025 specification nut that has a tensile strength of of 140,000 PSI.
When reading the prior posts above, I assumed a switch from AN to the MS numbering system was just that, a change of numbers. I was unaware the part was actually being superseded in strength.
I will be thinking about this the next time I replace an axle nut, or I see a video of a wheel coming off an axle!
Wed May 29, 2019 5:56 pm
It's the T-6 we need the details for.
Wed May 29, 2019 9:36 pm
IPC for the Canadian Harvard, dated 1 Jan 53, shows the main wheel nut to be a B10018-2, with a listed alternative being an AN7502-23.
Thu May 30, 2019 3:40 am
Perfect, thank you
Thu May 30, 2019 12:33 pm
No sweat. doing parts chases can be a blast at times and a hair puller at others...
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