Heavy 10 Carriage Lock Dimensions?

That's not a H10 saddle lock. It looks like this:

View attachment 325821

I've also included a plan to make your own.
This post was very helpful. I used your posted drawing to make the carriage lock nut. Then I made a drawing for the screw and made it. Both parts installed very easily on South Bend heavy 10 lathe and work well. For the as made screw I modified the square nut to be 10 mm so I could use a common wrench with an Enco 12x36 metal lathe. The attached drawing has the standard South Bend 7/16 square flats.
 

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Any idea whether this part might be compatible with a 13in lathe as well as the heavy 10? I’m about to start rebuilding a 13 I just bought and the carriage lock is missing on it as well
 
Any idea whether this part might be compatible with a 13in lathe as well as the heavy 10? I’m about to start rebuilding a 13 I just bought and the carriage lock is missing on it as well

The 13" stop is larger than the 10". I don't know how much larger, or if it is proportional. So, "no", this part isn't compatible. I don't own a 13" so I can't even measure one for you.
 
Maybe I can just use this as a template and just size accordingly. Will be a good project anyway
 
I saw a carriage lock nut for a 12" south bend. It was both wider and taller than the 10" lock nut. Both are the same basic shape. You can try measuring the width of the slot in the saddle that the nut fits in to get that dimension.
 
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