What's the difference between 991S01-*-1AGV and 91S2-*

91S2-* is made of steel cadmium plated and has a hex head 9/16" 991S01-*-1AGV is made of steel zinc plated RoHS conform CrVI free and has a hex head for a key 13mm

We can for you produce all 991s01-*-1AGV versions with a 9/16" head headstyle ; we can have them also made in yellow zinc plating that is RoHS conform However, if you can and need quick stock availability, you can opt to install a metric hex head on the same spot where you have a 9/16" head stud as parts are interchangeable, it's just the head style & plating that is different If you can't walk away from cadmium plating, please consider the stainless steel version 991S01-*-1BP Here is the table:

9/16" cadmium plated stud	SW13 steel zinc plated stud
91S2-3	991S01-3-1AGV
91S2-4	991S01-4-1AGV
91S2-5	991S01-5-1AGV
91S2-6	991S01-6-1AGV
91S2-7	991S01-7-1AGV
91S2-8	991S01-8-1AGV
91S2-9	991S01-9-1AGV
91S2-10	991S01-10-1AGV
91S2-11	991S01-11-1AGV
91S2-12	991S01-12-1AGV
91S2-13	991S01-13-1AGV
91S2-14	991S01-14-1AGV
91S2-15	991S01-15-1AGV
91S2-16	991S01-16-1AGV
91S2-17	991S01-17-1AGV
91S2-18	991S01-18-1AGV
91S2-19	991S01-19-1AGV
91S2-20	991S01-20-1AGV
91S2-21	991S01-21-1AGV
91S2-22	991S01-22-1AGV
91S2-23	991S01-23-1AGV
91S2-24	991S01-24-1AGV
91S2-25	991S01-25-1AGV
91S2-26	991S01-26-1AGV
91S2-27	991S01-27-1AGV
91S2-28	991S01-28-1AGV
91S2-29	991S01-29-1AGV
91S2-30	991S01-30-1AGV
91S2-31	991S01-31-1AGV
91S2-32	991S01-32-1AGV
91S2-33	991S01-33-1AGV
91S2-34	991S01-34-1AGV
91S2-35	991S01-35-1AGV
91S2-36	991S01-36-1AGV
91S2-37	991S01-37-1AGV
91S2-38	991S01-38-1AGV
91S2-39	991S01-39-1AGV
91S2-40	991S01-40-1AGV
91S2-41	991S01-41-1AGV
91S2-42	991S01-42-1AGV
91S2-43	991S01-43-1AGV
91S2-44	991S01-44-1AGV
91S2-45	991S01-45-1AGV
91S2-46	991S01-46-1AGV
91S2-47	991S01-47-1AGV
91S2-48	991S01-48-1AGV
91S2-49	991S01-49-1AGV
91S2-50	991S01-50-1AGV