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Parts of a wheel and terms

Upper plate: horizontal plate to fix a wheel to equipment.

Bolt or mounting pin: bolt or pin to fix a wheel to equipment.

Kingpin: a nut with thread and a bolt that hold the swivel structure together. A bolt with thread also ensures accurate and durable mounting of a fork

Swivel fork: to mount a wheel to a plate.

Bearing race: one row of balls in a groove.

Double bearing race: two rows of balls independently rotating through two levels of grooves.

Roller bearings: serviceable roller bearing used mostly in the lower part of the fork.

Ball-bearing: serviceable ball bearing used mostly in the upper part of the fork.

Mounting bolt: bolt for wheel mounting.

Mounting nut: nut for wheel mounting.

Grease nipple: lubricates upper and lower bearings.