NDHQ20215DTX5AAngular Contact Ball Bearing Tandem Duplex Set 75x130x25 mm ABEC-5 Medium Preload Phenolic Separator

Product Description

What this part is

New Departure Hyatt Q20215DTX5A single-row angular contact ball bearing, 75 mm bore, 130 mm outside diameter, 25 mm width. Open on both faces, phenolic ball separator, faces flush ground for duplex tandem mounting.

Decoding the designation

Q – nonmetallic (phenolic) ball separator
20215 – New Departure 20200 angular contact series; bore code 15 = 75 mm; ISO 7215 dimensional envelope
DT – duplex tandem set, all faces flush ground to preload requirement for universal mounting in tandem, back-to-back or face-to-face
X – medium preload, on angular contact types
5 – ABEC-5 tolerance class
A – rust-preventive slush

What these specs mean in practice

Medium preload sits between the L light and T heavy classes: more axial and radial stiffness than light, and more running torque and heat than light, which lowers the practical speed ceiling. In a tandem stack both rows take thrust in the same direction and share it, so one-direction axial capacity roughly doubles over a single row while reverse thrust is carried by the opposing bearing in the housing. A phenolic separator is light and quiet and holds oil in the laminate, with a lower temperature ceiling than a machined metal cage.

Published specifications

Bore: 75 mm (2.9528 in)
Outside diameter: 130 mm (5.1181 in)
Width, each bearing: 25 mm (0.9843 in)
Rows: 1 per bearing
Rolling element: ball
Closure: open
Precision class: ABEC-5
Preload: medium (X)
Separator: phenolic
Arrangement: duplex tandem, universally ground

Quantity and configuration

A DT designation describes single-row bearings ground as a matched set, not a double-row bearing. Each bearing is a separate part.

Fitting notes

Match marks on the ring faces are aligned as ground when the set is stacked. Shaft and housing seats are held to the tolerance grade of the bearing, and clamp load passes through the ring faces rather than the separator. Preload is established by the flush-ground faces once the rings are clamped solid.

Interchange guidance

The 75 x 130 x 25 mm envelope matches the ISO 7215 series. New Departure Hyatt was a General Motors division and the line later passed through Delphi, so this designation is obsolete and is searched alongside its ISO number. A same-envelope bearing built to a different contact angle, preload class or separator material is a related size rather than an interchange.