Yes, the hubs have locknuts on the screws holding each side of the hubs together, but there’s also 4 or 5 screws that attach the hub itself to the adapter on the GD
send a pic of what you’re working on
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Okay, its not with me now but i’ll send pics when i’m back in the shop
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@3DServisas Hey been wanting to get a hold of you for the urethane geardrive if I can drop a order ordering helical geardrive with remachining of the motor spur to 10mm D shaft instead as you dont have an option, but haven’t got an reply on message or email.
looking forward to your responce as I have a very specific build in mind, also the 230mm hangers can they fit a 6355 motors ? 
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I have replied to you via e-mail. Check your inbox.
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How are the pinion gears in your drives fastened to the angular contact bearing which is between them and the motor? Can the connection support axial loads in both “pushing” (towards the motor) and “pulling” (away from the motor) directions? is that pinion (that i presume has some kind of hub on it) just loctited into the bearing?
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It’s pressed Into the bearing seat adapter like so
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The pinions are not hardened because they are made out of hard steel.
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How does the steel get hard?
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that’s what she said
Steel gets harder depending on what additives it has. You should be able to find some information about grades of steel on the internet.
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This search might be more productive if you share what grade of steel your pinion gears are made out of 
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Actually steel gets harder with the heat treatment process, provided that it is a high carbon steel. (0.6-2.0% carbon). The additives like nickel, vanadium, chromium, etc, determine its characteristics after heat treating.
Gears should NOT be made from tool steel and hardened through, as the teeth can become brittle and break easier with impact. Plus, much more expensive. Most gears are, and should be made from a mild steel, then case hardened, carburized (carbon introduced at high heat to the surface). This provides for the teeth to have a hard surface, and soft core for strength.
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I’m very aware of different formulations of steel, as both a knife steel enthusiast and budding metallurgical scientist.
In fact, many prominent community members are already aware that I’m something of a scientist myself.
That being said, unless you’re using a case hardened mild steel, your steel has been hardened at some point.
The additives in steels don’t dictate the end hardness, the temper and/or heat treat does.
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