Rear axle nut
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Stage III
Joined: Feb 2026
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From: Castleberry Alabama
Rear axle nut
Does anyone know the size of the rear axle nut on a 99 Harley Davidson Electra Glide flhtpi? I have a service manual but it does not give me the size of the rear axle nut.
Thread Starter
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Stage III
Joined: Feb 2026
Posts: 3
Likes: 0
From: Castleberry Alabama
So I need a 15/16 12-sided socket?
most videos I have watched Say 36 mm I don't need to know the length of the boat or the threads I need to know the size of the nut so that I can buy the right size tool to remove the axle and take the tire off.
Seasoned HDF Member
Joined: Oct 2019
Posts: 10,795
Likes: 7,420
From: OH
that equals .9375 closest metric is 24 mm
you do NOT need a 12 point
Seasoned HDF Member
Joined: Feb 2007
Posts: 6,081
Likes: 1,127
From:
It looks like you are new to forum so your knowledge base is unknown...
Reads like detailed part information was noted for this application.
6 or 12 point socket does not matter much in this application but 6 point is more snug on nut.
I would suggest a deeper well socket instead of regular and also a socket extension.
That swingarm is a hollow boxed tube so the torque spec must be followed.
That swingarm should not have lowering blocks on bottom of shocks and swingarm should be reviewed for crack near axle, especially if lowering blocks were used.
Some individuals remove the bolt on the bottom of each shock while bike is on jack and then raise the bike some more so the swingarm drops and access is improved for axle rod removal.
Keep in mind that other side of axle will need to be held in place when loosening/tightening axle bolt.
Also keep in mind of weight distribution changes on lift/jack when rear wheel is removed since a fall over is easy if not strapped.
Highly recommend that service manual be reviewed for torque specifications.
Again, we do not know your knowledge base...
36 mm are newer bikes.
Guessing that you are trying to remove the WHEEL to then maybe take that wheel someplace for tire replacement?
This is a link to a parts finder to help you identify parts in future:
https://partsfinder.onlinemicrofiche....asp?make=hdmc
Reads like detailed part information was noted for this application.
6 or 12 point socket does not matter much in this application but 6 point is more snug on nut.
I would suggest a deeper well socket instead of regular and also a socket extension.
That swingarm is a hollow boxed tube so the torque spec must be followed.
That swingarm should not have lowering blocks on bottom of shocks and swingarm should be reviewed for crack near axle, especially if lowering blocks were used.
Some individuals remove the bolt on the bottom of each shock while bike is on jack and then raise the bike some more so the swingarm drops and access is improved for axle rod removal.
Keep in mind that other side of axle will need to be held in place when loosening/tightening axle bolt.
Also keep in mind of weight distribution changes on lift/jack when rear wheel is removed since a fall over is easy if not strapped.
Highly recommend that service manual be reviewed for torque specifications.
Again, we do not know your knowledge base...
36 mm are newer bikes.
Guessing that you are trying to remove the WHEEL to then maybe take that wheel someplace for tire replacement?
This is a link to a parts finder to help you identify parts in future:
https://partsfinder.onlinemicrofiche....asp?make=hdmc
Seasoned HDF Member
Joined: Sep 2008
Posts: 14,143
Likes: 11,211
From: San Diego, CA
OP, maybe this will convince you....
OP,
You have the 3/4" rear axle (0.9375 inch) with 5/8" thread nut, and use 15/16" socket.
The newer twin cam bikes have a 25mm axle (0.984252 inch), 24mm thread nut, and use a 36mm socket.
All you have read about the 36mm socket is reference the newer models.
Make sure when you are looking up info for a bike project, you always reference the year and model. There are so many subtle changes over the years, you need to make sure you getting info for YOUR year & model...
Last edited by hattitude; Feb 25, 2026 at 09:20 AM.
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