Per mcmaster carr part number has multiple sources and oem could not be provided
A metallic item, usually square or rectangular in cross section, usually longer in relation to its width and thickness, with or without a head, usually designed to fit into the pre-cut slots of two adjacent cylindrically shaped members, to prevent relative rotational movement between the two. It may have mounting holes or slots.
NSN 5905-01-283-9581
NSN 5990-01-392-5682
NSN 6220-01-501-2784
NSN 6105-01-243-0371
NSN 6220-01-136-7820
NSN 6650-01-041-0296
NSN 5945-01-227-9887
NSN 6105-01-050-9376
NSN 5855-00-962-5792
NSN 5910-01-245-8757
NSN 5999-01-278-6635
NSN 6150-00-250-1031