Fafnir2MM219WICRSuper Precision Angular Contact Ball Bearing 95 x 170 x 32 mm 15 Degree ABEC 7 Phenolic Cage Open

Product Description

What this part is

A single-row super-precision angular contact ball bearing in the Fafnir 200WI spindle series, 95 mm bore × 170 mm outside diameter × 32 mm width. The ISO equivalent designation is 7219 C.

Decoding the designation

2MM — 15° contact angle, Fafnir super-precision spindle bearing.
219 — 200 dimension series, bore code 19, giving a 95 mm bore.
WI — spindle angular contact ball bearing, universally ground faces.
CR — phenolic cage riding on the outer ring land.

The MM prefix on a Fafnir spindle bearing carries P4S tolerances — ABEC 7 dimensional accuracy with ABEC 9 running accuracy.

What these specs mean in practice

A 15° contact angle biases the bearing toward speed and radial rigidity, and carries less thrust than a 25° bearing in the same envelope. Outer-land-riding phenolic cages are light, self-lubricating and dimensionally stable at high DN values, which is why they are standard on grinding and milling spindles. Phenolic places the working temperature ceiling near 120 °C.

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: ABEC 7 / ISO P4S
Rows: 1
Cage: phenolic, outer-land-riding
Rolling elements: steel balls
Closure: open, both faces
ISO equivalent: 7219 C

Quantity and configuration

Single bearing, 1 Pc. The universally ground faces allow assembly into a duplex or triplex stack of matching bearings, where the arrangement sets the preload.

Fitting notes

Mounting is an interference fit on the shaft and a close fit in the housing bore, both held to super-precision spindle limits. The faces seat against square ground shoulders, and a runout error at the shoulder transfers directly into the raceway.

Interchange guidance

Same-spec 15° P4 equivalents in other schemes are the SKF 7219 CD/P4A, FAG B7219-C-T-P4S and NSK 7219CTR. The 3MM219WI shares the envelope at a 25° contact angle, which makes it a related size rather than an interchange.