Die stem thread size

[Wayne S]

Does anyone know what thread size RCBS uses on their "neck expander" stem and what thread they use on their sizing die de-capper stem with the "expander ball " ??

[hiram]

1/4 X 28 on sizing die decapper.

[Rat-Man]

I believe the larger expander stem like for pistol calibers is 1/2-20, and the one for expander ball is 1/4-28. At work now so I can't double check, but these are standard fine threads so if you have a bolt you can double check these yourself.

[Jon K]

Wayne,

9/16-18 tpi (RCBS & LYMAN)
10-32 tpi (RCBS decapper stem early /current production-1/4-28 tpi)

Jon

[Wayne S]

Thanks All for the info,