NDHQ20217DTL5186Angular Contact Ball Bearing Tandem Duplex Set 85x150x28 mm ABEC-5 Light Preload Phenolic Separator

Product Description

What this part is

New Departure Hyatt Q20217DTL5186 single-row angular contact ball bearing, 85 mm bore, 150 mm outside diameter, 28 mm width. Open on both faces, phenolic ball separator, faces flush ground for duplex tandem mounting.

Decoding the designation

Q – nonmetallic (phenolic) ball separator
20217 – New Departure 20200 angular contact series; bore code 17 = 85 mm; ISO 7217 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
L – light preload
5 – ABEC-5 tolerance class
186 – NDH special-order deviation number
A – rust-preventive slush

What these specs mean in practice

Light preload is the lowest of the three NDH duplex classes — L light, X medium, T heavy — and it favours speed and low heat over maximum stiffness. Tandem rows take thrust in the same direction and share it, so one-direction axial capacity roughly doubles compared with a single bearing of the same size. ABEC-5 holds bore, outside diameter, width and ring runout tighter than commercial ABEC-1 grade. A phenolic separator is light and quiet and carries oil in the laminate, at a lower temperature ceiling than machined metal.

Published specifications

Bore: 85 mm (3.3465 in)
Outside diameter: 150 mm (5.9055 in)
Width, each bearing: 28 mm (1.1024 in)
Rows: 1 per bearing
Rolling element: ball
Closure: open
Precision class: ABEC-5
Preload: light (L)
Separator: phenolic
Arrangement: duplex tandem, universally ground

Quantity and configuration

Supplied as a matched set of single-row bearings, not a double-row bearing. Each bearing is a separate part and the grind is what pairs them.

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 comes from the flush-ground faces once the rings are clamped solid.

Interchange guidance

The 85 x 150 x 28 mm envelope matches the ISO 7217 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 New Departure Hyatt was a General Motors division and the line later passed through Delphi, so this designation is obsolete and is searched alongside its ISO number.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.