Gehmann PH577 Rearsight Short adaptor For Parker Hale or Redfield

This adpator will allow you to use most Gehmann  rearsight iris to fit your Parker Hale.

Parker Hale side, Male, M.40 x 10 Fine thread This information was not accurate and was corrected by Gehmann
Standard Diopter thread is M9.5 x 1.0
For optical Adaptors we use M9x0,75 (for this PH577)
Parker Hale Thread is 7/32“x40Gg BS  (55 degree flankangle)
Redfield use 7/32x40Gg Ansi ( 60 degree flankangle)

Wil only work with Gehmann iris with removable adaptor 
Will not fit iris with diopter, see picture