1240-12-186-3910

1240-12-305-9319 1240123059319 123059319 is a cylindrical item having an internally flanged diameter designed to retain a lens or window in the objective end, or a diopter scale at the viewing end of an optical instrument. it may have one or more of the following characteristics: internal thread or machined for a press fit, method of securing, and/or knurled periphery. for externally threaded items, see retainer, optical element. excludes cell, optical element; nut, plain knurled; nut, plain round; and ring, retaining.

1240-12-305-9772 1240123059772 123059772 is an item specifically designed to hold and/or position a mirror(s), prism(s), reflector(s), or the like, in an optical system. excludes cell, optical element; holder, mirror and holder, reflector.