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Silver metal insert bearing UC311 with inner race and outer ring

Ntn

NTN UC311 insert bearing 55x120x34mm electrician tool

SKU CH-6QMG-17287

Insert bearing with 55 mm bore, 120 mm outside diameter and 34 mm width for shaft mounting

  • Precision shaft support from 55 mm inner diameter
  • High load capacity with 120 mm outer diameter
  • Compact 34 mm width fits tight housings
  • Trusted NTN manufacturing quality
  • Ready for immediate installation in new condition

NTN UC311 Insert Bearing 55x120x34mm

The NTN UC311 is a single-row radial insert bearing with a 55 mm bore, 120 mm outer diameter and 34 mm width. It suits electricians and maintenance technicians who need a direct replacement for worn units in motor housings or conveyor rollers.

Sealed lubrication holds under continuous rotation

The bearing ships pre-greased with contact seals on both sides, so lubricant stays in and contaminants stay out during extended duty cycles. Heat buildup remains moderate because the internal clearance matches the UC311 specification for steady-speed operation.

Slip-fit mounting on standard shafts

The inner ring slides onto a 55 mm shaft and locks with two set screws, requiring only a hex key and no press tools. Misalignment beyond the bearing's limited self-aligning capacity causes premature wear, so verify shaft straightness before tightening.

How it compares

Measured against everything we stock in Electrical Trade Tools & Kits, at today’s prices. Recalculated every night.

Price $79.99
Cheaper than about 61% of the 5,006 comparable items (median $95.99).

Specifications

Product
Brand nameNTN
Model nameNTN UC311

Questions about this item

How much heat does the NTN UC311 generate during continuous daily operation?

The NTN UC311 is a passive mechanical component with no electrical input, so it produces no heat of its own during operation.

What shaft size and housing bore are required to mount the NTN UC311?

The NTN UC311 requires a 55 mm shaft diameter and a 120 mm housing bore for proper installation.

Can the NTN UC311 replace an older UC311 bearing with the same 55x120x34 mm dimensions?

Yes, the NTN UC311 matches the standard 55x120x34 mm envelope, making it a direct dimensional replacement for existing UC311 units.

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