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Track Nut
From WikiPedalia
An axle nut with a built-in washer loosely riveted to it. The washer is permanently attached, but can rotate with respect to the nut. Used on high quality solid-axle hubs. Cheaper solid-axle hubs use serrated flange nuts, or plain nuts with serrated washers.
| Track Nuts | Serrated Flange Nuts |
