Rotor bolt with an M6 x 10 size designation and an FA marking, for Kawasaki applications.
Rotor bolts are small fasteners doing a serious job, and they spend their lives in brake dust and water. Once the head is corroded you cannot get a clean grip to remove or retorque it, which matters on the one joint where a fastener working loose gives you no warning at all.
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You can still order it now — it’s expected to ship in about .