B-45-03-03-02 - 3/16" x 1/8"
B-45-04-04-02 - 1/4" x 1/4"
B-45-04-04-04 - 1/4" x 1/4" 
B-45-04-04-06 - 1/4" x 3/8" 
B-45-05-05-02 - 5/16" x 1/8" 
B-45-05-05-04 - 5/16" x 1/4" 
B-45-06-06-04 - 3/8" x 1/4" 
B-45-06-06-06 - 3/8" x 3/8"
B-45-08-08-04 - 1/2" x 1/4"
B-45-08-08-06 - 1/2" x 3/8"
B-45-08-08-08 - 1/2" x 1/2"
B-45-10-10-08 - 5/8" x 1/2"
B-45-12-12-08 - 3/4" x 1/2"
B-45-12-12-12 - 3/4" x 3/4"

This brass hydraulic SAE 45° fitting is equivalent to the following:
-SAE 101203
-Eaton Weatherhead 45