NSK7215CTDULPA7Super-Precision Angular Contact Ball Bearing – Straight Bore, 75 mm ID, 130 mm OD, 25 mm Width, Open, 15° Contact Angle, Phenolic Cage, Light Preload, Single Universally Ground

Product Description

What this part is

NSK 7215CTSULPA7 super-precision single-row angular contact ball bearing, 75 mm bore, 130 mm outside diameter, 25 mm width. Steel balls, phenolic resin cage, open on both faces, straight bore.

Decoding the designation

In the NSK super-precision scheme, 72 is the ISO dimension series and 15 is the bore code — 15 × 5 = 75 mm. The C is a 15° contact angle. The T is a phenolic cage. SU marks a single universally ground ring set, and the L calls light preload when two or more are stacked.

What these specs mean in practice

A 15° contact angle biases the bearing toward speed and radial rigidity and away from thrust capacity; a 25° or 30° ring of the same envelope trades that the other way. The phenolic cage is light, tolerant of marginal lubrication and rated to 120 °C, which is what allows the high limiting speed on a bearing of this bore. This is a machine-tool and grinding-spindle class of bearing.

Thrust direction and arrangement

A single row of angular contact balls carries thrust in one direction only, toward the high shoulder. Universally ground rings are flush-ground so that any two will assemble back-to-back, face-to-face or in tandem without shims. A back-to-back or face-to-face pair locates the shaft in both directions; a tandem pair remains one direction with roughly double the capacity.

Quantity and configuration

1 Pc. Single bearing, universally ground, light preload class. Supplied without a spacer set.

Fitting notes

Universally ground rings carry a marking on one face that establishes orientation; keeping the marks together governs which arrangement results. Interference on both the shaft seat and the housing bore removes preload from the running clearance, so the seats are ground to the spindle tolerance rather than to a nominal 75 mm and 130 mm.

Interchange guidance

The direct single-universal equivalents at 15° and this envelope are the FAG B7215-C-T-P4S-UL and the Timken Fafnir 2MM215WI-SUL. The SKF 7215 CDGA/P4A is the same geometry supplied as a matched duplex pair rather than as a single universal ring, so it is a related designation and not a one-for-one substitution. A 7215A or 7215B of the same 75 x 130 x 25 mm envelope carries a different contact angle and is a related size.