This Nut Set, Square M3*6*1.6 Fe Ni (100 pcs) is suitable for Roland RA-640 printers. This is the original Roland part (number 31109601).
 
Printer compatibility
Roland BN-20
Roland CJ-400
Roland CJ-500
Roland CJ-540
Roland FJ-400
Roland FJ-500
Roland FJ-540
Roland FJ-600
Roland FP-740
Roland LEC-300
Roland LEC-300a
Roland LEC-330
Roland LEC-540
Roland LEJ-640
Roland RA-640
Roland RE-640
Roland RS-540
Roland RS-640
Roland SC-500
Roland SC-540
Roland SC-545ex
Roland SJ-1000
Roland SJ-1045ex
Roland SJ-500
Roland SJ-540
Roland SJ-600
Roland SJ-640
Roland SJ-645ex
Roland SJ-740
Roland SJ-745ex
Roland SP-300i
Roland SP-540i
Roland VP-300
Roland VP-300i
Roland VP-540
Roland VP-540i
Roland VS-300
Roland VS-300i
Roland VS-420
Roland VS-540
Roland VS-540i
Roland VS-640
Roland VS-640i
Roland XC-540
Roland XC-540mt
Roland XJ-640
Roland XJ-740
Roland SP-300
Roland SP-300v
Roland SP-540v
Roland XF-640
Roland XJ-540
Roland EJ-640
Roland RF-640
Roland RF-640a
Roland XT-640
Roland LEF-20
Roland XR-640