This Washer Set, Plain 6.5*16*1 Ni (100 pcs) is suitable for Roland RA-640 printers. This is the original Roland part (number 31249220AS).
 
Printer compatibility
Roland LEC-300
Roland LEC-300a
Roland LEC-330
Roland LEC-540
Roland LEJ-640
Roland RA-640
Roland SC-545ex
Roland SJ-645ex
Roland SJ-745ex
Roland VS-300i
Roland VS-540i
Roland VS-640i
Roland XR-640
Roland FJ-540
Roland SJ-540
Roland SJ-640
Roland SJ-740
Roland SG-300
Roland SG-540
Roland VG-640
Roland VG-540
Roland EJ-640
Roland RF-640
Roland RF-640a
Roland XT-640