From the axial reference face to the middle of the pin the B4 is 15,8 and the BK is 18,3mm rounded to 1/10 of millimeter ( I am not familiar with imperial, sorry). So as sayed before it is a diff. of 2,45-2,5mm. The dim from the thread is not importent as stated already from super_dan.
The pic shows both axles with the dims. I measured right now again.
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elektrobuggy
AE B44FT - B4FT - T4 FT
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