Fafnir2MM219WICRDULSuper Precision Angular Contact Ball Bearing 95x170x32 mm 15 Degree ABEC 7/9 Light Preload Phenolic Cage

Product Description

What this part is

A Fafnir 2MM219WI-SUL super precision single-row angular contact ball bearing. Bore 95 mm, outside diameter 170 mm, width 32 mm, in the ISO 7219 envelope. Open on both faces, with a phenolic outer-land-riding cage.

Decoding the designation

2MM — 15° contact angle
MM prefix — P4S precision, ABEC 7/9
219 — ISO 72 series, 95 mm bore
WI — Fafnir super-precision angular contact series
CR — phenolic outer-land-riding cage
SU — single, universally ground for stacking in any arrangement
L — light preload

What these specs mean in practice

A 15° contact angle favours speed and radial stiffness over thrust capacity; a 25° angle of the same envelope trades that the other way. Light preload keeps heat generation and torque low, which suits higher spindle speeds. The phenolic cage is light and runs quietly at speed, with a service ceiling well below that of a machined bronze cage. A single row takes thrust in one direction only.

Published specifications

Bore: 95 mm (3.7402 in)
Outside diameter: 170 mm (6.6929 in)
Width: 32 mm (1.2598 in)
Contact angle: 15°
Precision class: P4S (ABEC 7/9)
Preload: light
Rolling elements: steel balls, single row
Closure: open both faces

Quantity and configuration

1 Pc. Single bearing, universally ground.

Fitting notes

Universal grinding allows this bearing to be mounted alone or stacked back-to-back, face-to-face or in tandem, with preload established by the ground faces. Mounting surfaces are cleaned and the bearing is pressed on the ring that takes the interference fit.

Interchange guidance

The ISO equivalent designation is 7219C-T-P4S at 15°. Same-envelope bearings at a 25° contact angle, such as a 3MM219WI, are a related size rather than an interchange, as is any variant at medium or heavy preload.