tilt window sash pivot bar
A handy person from redmond,wa says:
November 20, 2011
I need 6 sash pivot bars. They are made out of flat steel stock 1/16th inch thick and 5/8th inch wide and 1 1/4 inch long. On the length of the flat stock are two holes. One is located 11/16th inch from the end and is for a single mounting screw. The other hole is 3/16th inch from the same end from which a 5/32nd inch diameter pin is swedged protruding 1/2 inch. This pin engages with the bottom of the balance spring in the jamb liner
Mike from SWISCO responded:
November 21, 2011
Take a look at the 20-016 Tilt Pin, it looks like a good match.