NDH20224DTL5AAngular Contact Ball Bearing Tandem Duplex Set 120x215x40 mm ABEC-5 Light Preload

Product Description

What this part is

New Departure Hyatt 20224DTL5A single-row angular contact ball bearing, 120 mm bore, 215 mm outside diameter, 40 mm width. Open on both faces, no shields and no seals. Rings and faces are flush ground for duplex tandem mounting.

Decoding the designation

20224 – New Departure 20200 angular contact series; bore code 24 = 120 mm; ISO 7224 dimensional envelope
DT – duplex tandem set, all bearing 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
A – rust-preventive slush
No Q prefix – metallic ball separator

What these specs mean in practice

Light preload is the lowest of the three NDH duplex preload classes — L light, X medium, T heavy. It buys shaft rigidity and repeatable axial location while keeping running torque and heat generation low, which favours the faster spindle positions. Two rows mounted in tandem share one-direction thrust between them, giving roughly twice the axial capacity of a single row of the same size; reverse thrust is taken by whatever bearing opposes them in the housing. ABEC-5 holds bore, outside diameter, width and ring runout to tighter limits than the ABEC-1 commercial grade.

Published specifications

Bore: 120 mm (4.7244 in)
Outside diameter: 215 mm (8.4646 in)
Width, each bearing: 40 mm (1.5748 in)
Rows: 1 per bearing
Rolling element: ball
Closure: open
Precision class: ABEC-5
Preload: light (L)
Arrangement: duplex tandem, universally ground

Quantity and configuration

A DT designation describes two single-row bearings ground as a matched set, not a double-row bearing. Each ring is a separate part and the set is ground to work together.

Fitting notes

The marked faces of a universally ground set go together for the intended arrangement, with the burnished vee or high points aligned as ground. Shaft and housing seats are held to the bearing tolerance grade, and the set is clamped through the ring faces rather than the cage. Preload is established by the ground faces once the rings are clamped, so no shimming is required.

Interchange guidance

The 120 x 215 x 40 mm envelope matches the ISO 7224 series. New Departure Hyatt was a General Motors division and the bearing line later passed through Delphi, so this designation is an obsolete number that buyers commonly search alongside its ISO equivalent. Same-envelope bearings built to a different contact angle, preload class or tolerance grade are related sizes rather than interchanges.