NSK7214CTRSULP4YSuper Precision Angular Contact Ball Bearing 75 x 125 x 24 mm 15 Degree Light Preload Phenolic Cage P4

Product Description

What this part is

A single-row super-precision angular contact ball bearing in the 72-series, 75 mm bore, 125 mm outside diameter, 24 mm width. It is universally ground, so any two bearings of the same designation stack into a matched set at the specified light preload in back-to-back, face-to-face or tandem arrangement.

Decoding the designation

72 — ISO angular contact ball bearing dimension series14 — bore code, 14 × 5 = 75 mm boreC — 15° contact angle in the NSK schemeTR — phenolic cageSU — single, universally ground facesL — light preload classP4Y — P4 precision to the NSK Y tolerance specification, equivalent to ABEC 7

What these specs mean in practice

A 15° contact angle gives high speed capability and strong radial stiffness with moderate thrust capacity, which is the standard choice for the front and rear positions of a machine tool spindle. Light preload keeps friction and heat generation low and allows the highest running speed of the preload classes, trading away some axial rigidity relative to medium or heavy.

The phenolic cage runs quietly at speed and holds lubricant in its laminate structure. P4Y accuracy holds tight bore and outside diameter tolerance with low radial and axial runout, and the universal grind means the faces are finished so that stacked bearings reach the stated preload without shims or spacers.

Quantity and configuration

Single bearing, 1 Pc. Universally ground for use alone or stacked with identical bearings as a duplex, triplex or quad set.

Fitting notes

The wide outer-ring shoulder takes thrust, so orientation sets the load direction. Multiple bearings assemble with their marked faces aligned to the intended arrangement, clamped between a square shaft shoulder and a precision lock nut. Shaft and housing seats to the accuracy grade the P4 class assumes preserve the ground runout.

Interchange guidance

Genuine interchanges are 15° universally ground light-preload P4 bearings in the same envelope: RHP 7214CTSULP4, Fafnir / Timken 2MM9114WI CR SUL, and FAG B7214-C-T-P4S-UL. A 7214 in A5 or A form carries a 25° or 30° contact angle, and a SUM or SUH variant carries medium or heavy preload; those are related sizes rather than interchanges.