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A plain bore bearing (often Delrin, a low-friction plastic) is a simple bushing with no rolling elements — the wheel spins directly against the bushing material. It's the lowest-cost bearing option, suited to light-duty, infrequent use.
Without rolling elements, plain bore bearings have higher rolling resistance and lower capacity than ball or roller bearings, but they cost less and have fewer parts to wear out under light use.
Light-duty furniture, occasional-use carts, and cost-sensitive applications where high cycle counts and heavy loads aren’t a factor.
Specifying plain bore for daily heavy use. It’s built for light, infrequent duty — pushing it into a high-cycle industrial role wears it out fast.
Is Delrin the same as plain bore?
Delrin is a common bushing material used in plain bore bearings — "plain bore" describes the bearing type, Delrin describes what it's made of.
Why choose plain bore over ball bearing?
Mainly cost, for light-duty applications where the higher rolling resistance and lower capacity don't matter.
