| 摘要 |
This invention relates to a metal insert component comprising: a tubular axle portion; and a plurality of projections formed on an external peripheral surface of the tubular axle portion; wherein the projections are located at different positions along an axial direction of the tubular axle portion. This invention also relates to a metal insert component comprising: a tubular axle portion; and a projection formed on an external peripheral surface of the tubular axle portion; wherein the projection comprising two differently angled end portions, and the two end portions are circumferentially arranged.
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