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Small open drawn cup needle roller bearing in alloy steel

Koyo

Koyo B 2-1/2 4 Drawn Cup Needle Roller Bearing

SKU CH-3830-AYDQ6

Drawn cup needle roller bearing with 5/32 in bore, 9/32 in outside diameter, 0.25 in width, oil lubrication and 11,000 RPM maximum speed

  • Open design simplifies lubrication and inspection
  • Full complement needle set maximises load capacity in tight spaces
  • Alloy steel construction resists wear under high-speed operation
  • Rated to 11 000 RPM for demanding rotational applications
  • Operates from -22 °F to 248 °F across harsh environments

B 2-1/2 4 Drawn Cup Needle Roller Bearing

The KOYO B 2-1/2 4 is a drawn cup needle roller bearing built for power-transmission assemblies that need a compact rolling element. Its 5/32 in bore and 9/32 in outside diameter suit shafts and housings where radial space is limited. The open, full-complement design carries high radial loads in a 0.25 in overall width. Maintenance teams and machine builders specify it for gearboxes, linkages and similar mechanisms.

Thermals noise and power draw in normal use

Oil lubrication allows smooth operation across a -22 °F to 248 °F temperature range. The alloy steel rings and rollers run without seals, so churning losses stay low at typical speeds. At the rated 11,000 RPM the bearing generates minimal heat and negligible acoustic signature in a properly aligned assembly. Power consumption remains a small fraction of the total drivetrain loss.

Behaviour under sustained load

The full-complement needle set distributes load over a large contact area, resisting brinelling during continuous operation. Alloy steel construction maintains dimensional stability when the bearing runs near the 248 °F upper limit for extended periods. Open ends let fresh oil reach the rollers, preventing lubricant starvation that would accelerate wear. The single-row layout keeps friction predictable so torque stays steady throughout the duty cycle.

Highlights

  • Open design simplifies lubrication and inspection
  • Full complement needle set maximises load capacity in tight spaces
  • Alloy steel construction resists wear under high-speed operation
  • Rated to 11 000 RPM for demanding rotational applications
  • Operates from -22 °F to 248 °F across harsh environments

Specifications

No published specifications for this item yet.

Questions about this item

How do I press this 9/32 in outside diameter drawn cup bearing into its housing without damaging the thin shell?

Use a flat-ended arbor that contacts only the outer ring face, press straight and square, and never hammer directly on the cup or the 5/32 in bore rollers.

What ongoing lubrication does the full-complement, oil-filled bearing require after installation?

Replenish with clean mineral oil at regular intervals; the open closure offers no seal, so contamination and evaporation will deplete the lubricant over time.

At what point does the 248 °F maximum temperature limit become the first constraint during continuous running?

Sustained operation near 11,000 RPM generates heat that can push the bearing to 248 °F before the speed rating itself is reached, especially with minimal oil circulation.

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