RHP7213ETDULP4Super-Precision Angular Contact Ball Bearing Matched Pair, 65 x 120 x 23 mm, 25° Contact Angle, Phenolic Cage, ABEC 7 / P4, Light Preload — 2 Pieces

Product Description

What this part is

A matched duplex set of two RHP 7213 super-precision angular contact ball bearings, 65 mm bore x 120 mm outside diameter x 23 mm wide each. Universally ground faces let the two rings be clamped face-to-face, back-to-back or in tandem and arrive at a predictable light preload, which is what a spindle needs to hold running accuracy under thrust reversal.

Decoding the designation

7213 – single-row angular contact ball bearing, 65 x 120 x 23 mm.
E – RHP contact-angle code for 25°.
T – phenolic (laminated fabric) cage: light, self-lubricating, quiet, and the standard choice for high-speed super-precision service.
DU – duplex universally ground — a matched pair supplied together.
L – light preload.
P4 – ISO tolerance class 4, equivalent to ABEC 7.

What these specs mean in practice

A 25° contact angle sits in the middle of the range: more thrust capacity and axial stiffness than a 15° bearing, more speed capability than a 40°. That is the trade — if your spindle is thrust-dominant, 25° is usually right; if it is purely speed-limited, 15° wins. Light preload keeps heat generation and power draw down while still eliminating axial play, so it suits grinding and high-speed milling spindles better than a medium or heavy preload does. ABEC 7 controls bore, outside diameter, width and, critically, radial and axial runout, so the rings can be installed in any rotational orientation without chasing a high spot.

Quantity and configuration

Two bearings ship together as one matched duplex set. Do not split the set, and do not mix one of these rings with a bearing from another set — the preload comes from the ground offset between the two rings and is only correct as supplied.

Fitting notes

Keep the set together, keep it clean, and mount to the clamped arrangement the machine drawing calls for. Clamp the rings fully — a partially clamped duplex pair does not develop its designed preload and will lose stiffness. Never hammer a P4 bearing on; press or heat it. Grease sparingly (roughly a quarter to a third fill) or use the oil-air system the spindle was built around.

Interchange guidance

RHP became part of NSK, so the current-nomenclature equivalent is 7213A5TYNDULP4 in NSK terms, and the carton marking B7213X3TADUEP7 is NSK’s own super-precision coding for the same 65 x 120 x 23 mm, 25°, phenolic-cage, light-preload duplex set — both are carried here as searchable cross-references. Same-envelope equivalents from other makers: SKF 7213 ACD/P4ADGA (AC is SKF’s 25° code), FAG 7213-B-TVP-P4-UL (B is FAG’s 40° code, so it is a dimensional cross-reference with a different contact angle), NTN 7213CT1GD2GLP4 (C is NTN’s 15° code, again dimensionally equal but a different angle), Fafnir/Timken 3MM213WICRDUL (3MM is the Timken 25° code, the closest direct match). Always match the contact angle and preload class, not just the envelope.