NDHAngular Contact Ball Bearing Tandem Duplex Set 65x120x23 mm ABEC-7 Heavy Preload Phenolic Separator

Product Description

What this part is

New Departure Hyatt Q20213DTT7A single-row angular contact ball bearing, 65 mm bore, 120 mm outside diameter, 23 mm width. Open on both faces, phenolic ball separator, faces flush ground for duplex tandem mounting.

Decoding the designation

Q is the nonmetallic (phenolic) ball separator. 20213 is the New Departure 20200 angular contact series, bore code 13 giving a 65 mm bore in the ISO 7213 dimensional envelope. DT is a duplex tandem set, all faces flush ground to the preload requirement for universal mounting in tandem, back-to-back or face-to-face. T is heavy preload. 7 is the ABEC-7 tolerance class. A is a rust-preventive slush coating.

What these specs mean in practice

Heavy preload is the top of the three NDH duplex classes — L light, X medium, T heavy. It buys the highest axial and radial stiffness and the tightest axial position control, and it costs running torque, heat and limiting speed, which is why heavy-preload sets appear in boring and grinding spindles rather than high-rpm positions. A phenolic separator runs quieter and lighter than a machined bronze cage and holds oil in the fabric laminate, with a service temperature ceiling well below a metal cage. Two rows in tandem split one-direction thrust between them, roughly doubling the axial capacity of a single row.

Published specifications

Bore 65 mm (2.5591 in). Outside diameter 120 mm (4.7244 in). Width, each bearing, 23 mm (0.9055 in). One row per bearing, ball rolling elements, open closure. Precision class ABEC-7. Preload heavy (T). Separator phenolic. Arrangement duplex tandem, universally ground.

Quantity and configuration

2 Pcs, one matched tandem set. A DT designation describes two single-row bearings ground to work together, not a double-row bearing. Preload is set by the flush-ground faces once the rings are clamped solid.

Interchange guidance

The 65 x 120 x 23 mm envelope matches the ISO 7213 series. New Departure Hyatt was a General Motors division and the line later passed through Delphi, so this is an obsolete designation searched alongside the ISO number. A bearing built to a different contact angle, preload class or separator material is a related size rather than a substitute.