RHP7312ETDUMP4Super-Precision Angular Contact Ball Bearing 60x130x31 mm 25° ABEC 7 Medium Preload Phenolic Cage

Product Description

What this part is

An RHP 7312ETDUMP4 super-precision single-row angular contact ball bearing with a 60 mm bore, 130 mm outside diameter and 31 mm width. The 7312 designation places it in the ISO 73-series medium-section angular contact family. It is a spindle-grade bearing for machine tools, high-speed gearboxes, pumps and precision rotary tables.

Decoding the designation

Base number: 7312, a single-row angular contact ball bearing, 60 x 130 x 31 mm. E: 25° contact angle in the RHP scheme. T: phenolic (laminated fabric) cage. DU: duplex universally ground, so any two bearings of this designation mount together in DB, DF or DT without shims. M: medium preload. P4: ABEC 7 precision class.

What these specs mean in practice

A 25° contact angle sits in the middle of the super-precision range: it carries substantially more thrust than a 15° bearing while still running fast and stiff. That combination suits spindles where the cut generates real axial load, such as drilling and milling heads, rather than pure high-speed grinding duty.

The phenolic cage is light and self-lubricating, which lowers cage-to-ball friction and raises the safe speed limit against a machined brass cage. Phenolic has a lower temperature ceiling than brass, so it belongs in oil-mist, oil-air or light-grease systems rather than hot, heavily loaded applications.

Universal grinding is the feature that makes the bearing flexible on the bench: the faces are ground so that two units of the same designation form a matched set at a defined medium preload in any of the three standard arrangements. Medium preload raises spindle stiffness and running accuracy over light preload, at the cost of a higher operating temperature.

Published specifications

Bore: 60 mm. Outside diameter: 130 mm. Width: 31 mm. Rows: 1. Contact angle: 25°. Precision class: ABEC 7 / ISO P4. Preload: medium. Cage: phenolic. Closure: open.

Quantity and configuration

This listing supplies one bearing. 1 Pc. It is ground for duplex mounting, so a second bearing of the same designation is required to build a matched pair. Spacer rings, lock nuts and housings are supplied separately.

Interchange guidance

Genuine equivalents are other makers’ 7312 super-precision bearings at 25° with medium preload and P4 class, including the RHP/NSK B7312X2TADUMEP7 form of the same specification. Same-envelope 7312 bearings at a 15° or 40° contact angle, at light or heavy preload, or at P0 or P5 class are different parts and are not drop-in substitutes for this one.