520, 620 or Hex-Hole? A Mini 4WD Bearing Buying Guide
520 and 620 describe size categories; hex-hole describes an interface. Identify the location and exact part before deciding what to replace.
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Tamiya HG Round Hole Ball Bearings (4pcs.)(15519)
USD17.90
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Description
A set of precision ball bearings for a Mini 4WD's rotating parts, such as drive shafts and counter gears, replacing the plastic bushings that ship on most chassis. Ball bearings reduce rolling resistance compared with plain bushings, giving a smoother, more efficient drive.
- Outer diameter: 6mm
- Inner diameter: 2mm
- Thickness: 2mm
- Quantity: 4 pieces
The "HG" (High Grade) designation marks these as Tamiya's precision bearing line: this set sits alongside item 15111, the Mini Round Hole Ball Bearing Set, and item 15393, the Fluorine Coated Steel Bearing, as one of three round-hole bearing options in the catalogue, differing mainly in coating and grade rather than dimensions. "Round hole" describes the bearing's outer race shape, which drops straight into the round bearing holes molded into most chassis without needing a separate collar. Swapping the stock plastic bushings for a set of these on the counter gear and rear axle is one of the most common first upgrades on a new chassis.
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