Thread sizes for the Lyman #55 Powder Measure

[Rayant]

Can anyone help with the screw sizes on the Lyman #55 Powder Measure?

[Green Frog]

They are Lyman’s near proprietary thread they used for the old 310 tool dies as well as the TruLine Jr press. It is frequently called “5/8 X 30” but is actually something like .609” X 30 tpi, or thereabouts. AFAIK, this thread is used nowhere else in any other industry except when the Red Head loading press was made to use the old pre-Lyman dies from the Ideal #3 and #10 tools that became the Lyman 310 tool.

It actually makes sense since the first 55s were often mounted on TruLine Jr presses.

Froggie

[Pressman]

The Thumb screws are #10x36 tpi.

[wv109323]

PM sent

[GONRA]

GONRA - decades ago, had to resort to my Boy Hood 12" (twixt centers)
Sears? Craftsman? lathe to cut 30 threads/inch for these dies.
Kinda standardized on these odd threads so I could make sizing dies from 5/8 drill rod.....