NDHAngular Contact Ball Bearing Matched Tandem Pair DT 60x95x18mm 15 Degree

Product Description

What this part is

A matched tandem pair of New Departure Hyatt Q-series precision angular contact ball bearings on the 7012 envelope: 60 mm bore, 95 mm OD, 18 mm wide each, 36 mm stacked. NDH built precision ball bearings for machine tool and aerospace work, and the Q prefix denotes its precision angular contact line. Parts like this belong in spindles, ball screw ends and vertical shafts where one direction of thrust dominates.

Decoding the designation

Q — NDH precision angular contact ball bearing line.

0L12 — NDH size and design code; bore code 12 corresponds to the 60 mm bore, 7012 envelope.

DT — duplex tandem, a factory-matched pair intended to be mounted facing the same direction.

The 7012C reference on the carton gives the contact angle: C is 15°.

What these specs mean in practice

A tandem pair is not the same thing as a back-to-back pair, and the difference decides whether the machine works. Both bearings face the same way, so their thrust capacity adds — roughly double the axial load of a single bearing — but only in one direction. A tandem pair gives no axial location the other way, so the shaft needs a second bearing or a shoulder to hold it. A back-to-back arrangement instead locates the shaft both ways but halves the one-way thrust capacity and changes the intended load sharing. The 15° contact angle favours speed and radial capacity over maximum thrust per bearing, which is why tandem stacking is used to make up the axial capacity.

Published specifications

Bore: 60 mm.

Outside diameter: 95 mm.

Width: 18 mm each bearing.

Total width mounted as a tandem pair: 36 mm.

Contact angle: 15°.

Arrangement: duplex tandem (DT).

Series: 7000 light, 7012 envelope.

Rows: single row each.

Closure: open.

Cage: phenolic.

Precision rating: ABEC 7 / P4.

Mass: 0.93 lbs.

Quantity and configuration

Two bearings, supplied as the factory-matched tandem set. Both bearings face the same direction, with the thrust load carried on the high shoulders. The matched grind is what makes the two bearings share load evenly, so the pair is a single unit rather than two interchangeable singles.

Interchange guidance

Same-specification alternatives are 7012-envelope 15° angular contact bearings supplied as a matched tandem pair, such as 7012C DT sets and the Fafnir 2MM9112WI equivalent envelope in a tandem arrangement. Related but NOT interchangeable: a DB or DF (back-to-back / face-to-face) pair of the same size, a 7012A5 or 7012A at 25° or 30°, and any single 7012C bearing on its own. Arrangement and contact angle both have to match the machine design.