NSK7012ATYP4DBBC7-1/2PRSuper Precision Angular Contact Ball Bearing 60x95x18 mm, 30 Degree Contact Angle, ABEC 7, Polyamide Cage, Half of a Matched Set

Product Description

What this part is:

A single super precision angular contact ball bearing in the ISO 70 light series, 60 mm bore, 95 mm outside diameter, 18 mm width, ground as a member of a matched multi bearing set and supplied here as one bearing.

Decoding the designation:

• 7012 — ISO 70 series angular contact ball bearing, 60 x 95 x 18 mm.
• A — NSK contact angle code for 30°. NSK’s A5 is 25° and C is 15°, so a 7012A is not interchangeable with a 7012A5.
• TY — NSK polyamide cage code.
• P4 — ABEC 7 tolerance class. The ABEC 7 wording in the title is a correct restatement of P4, not a separate claim.
• DBB — a three bearing arrangement: a back-to-back pair with a third bearing in tandem.
• C7 — carried on the carton, meaning not published. Retained as a search term only.
• -1/2PR — half of a pair, meaning one bearing.

Correcting the source data:

This number contains a genuine internal contradiction that a buyer needs to see. DBB describes a three bearing set, while -1/2PR describes a single bearing broken out of a set. Both markings are real and both are kept, but they cannot both describe what ships. We publish the conservative reading, which is also the one that matches how split super precision stock actually arrives: this SKU is ONE bearing. If you need the full DBB triplex arrangement you need three matched bearings, and a set assembled from separately sourced singles will not carry the original set’s matched preload.

What these specs mean in practice:

A 30° contact angle is the heavy thrust end of the super precision range. It gives the highest axial load capacity and the highest axial stiffness of the three common angles, and it pays for that with the lowest limiting speed and the most heat at a given speed. It is the right choice for a vertical spindle carrying its own rotor weight, for heavily loaded ball screw ends, and for any position where axial deflection under load is what limits part accuracy. It is the wrong choice for a high speed grinding spindle, where a 15° bearing would be specified instead. The DBB arrangement the number references exists precisely because two bearings taking thrust in one direction plus one taking it in the other handles a strongly one sided axial load without overloading a single raceway.

Quantity and configuration:

One bearing. Stock is held in a way that does not distinguish sets from pieces, so no total set count is claimed here.

Fitting notes:

Observe the ring etching for orientation. Do not mix contact angles or tolerance classes within a set. Keep the polyamide cage below roughly 120 °C continuous, which on a 30° bearing is a live constraint rather than a formality because this angle generates more heat than its siblings.

Published ratings and mounting data:

Load ratings and limiting speed are not published by NSK for this exact suffix combination in a source we could verify, so they are left blank rather than borrowed from a 7012A5 or a standard tolerance 7012.

Interchange guidance:

Same envelope 30° super precision alternatives are found as B7012E-T-P4S (FAG, where FAG’s own angle coding must be checked rather than assumed) and 7012ACD/P4A (SKF). Confirm the angle in the vendor’s own scheme before substituting — the same letter means different angles across brands.