SEALING RING FOR MOTOR SHAFT STIHL CHAINSAW MODELS: 017 - 018 - 019 T - 021 - 023 - 025 - BR 350 - BR 430 BR 500 - BR 550 - BR 600 - FR 410 C - FR 460 TC FS 240 , FS 360 C , FS 410 C , FS 460 C FS 490 C , FS 510 C , FS 560 C , MS 170 , MS 180 MS 171 , MS 181 , MS 190 T , MS 210 MS 211 , MS 230 , MS 250 , MS 270 , MS 280 MS 311 , MS 391 , SR 430 , SR 450 MEASUREMENTS: OUTER DIAMETER: 25 mm INTERNAL DIAMETER: 15 mm WIDTH: 5 mm Order no.: 40271443 Original part number: 9639 003 1585 MP 017, 018, 019 T, 021, 023, 025, BR 350, BR 430, BR 500, BR 550, BR 600, FR 410 C, FR 460 TC, FS 240, FS 360 C, FS 410 C, FS 460 C, FS 490 C, FS 510 C, FS 560 C, MS 170, MS 180, MS 171, MS 181, MS 190 T, MS 210, MS 211, MS 230, MS 250, MS 270, MS 280, MS 311, MS 391, SR 430, SR 450