Fafnir2MM213WI CR DUMAngular Contact Ball Bearing – Straight Bore, 65 mm ID, 120 mm OD, 23 mm Width, Open, 15° Contact Angle, Medium Preload, Duplex Universal Pair.

Product Description

What this part is:

Fafnir 2MM213WI-CR-DUM super-precision angular contact ball bearing, 200WI spindle range, 65 x 120 x 23 mm. Bore Diameter: 65 mm. Outside Diameter: 120 mm. Overall Width: 23 mm. Contact Angle: 15°. Precision Class: ABEC 7/9 / P4S. Dynamic Load Rating: 77,400 N. Static Load Rating: 54,700 N. Limiting Speed: 12,100 rpm grease; 24,200 rpm oil. Preload: Medium. Cage Material: Phenolic. Rolling Elements: Ball. Bore Type: Straight. Closure Type: Open. Bearing Material: Chrome steel. Number Of Rows: 2. Mounting Arrangement: Universal. Lubricant: grease or oil. Series: 200WI. Base Number: 2MM213WI. GTIN: 087796070783.

Decoding the designation:

2MM — 15° contact angle.

MM — Fafnir super-precision execution, ISO Class P4S, equivalent to ABEC 7/9.

213 — 200 spindle series, 65 mm bore, ISO 7213 envelope.

WI — low shoulder on both rings.

CR — phenolic cage.

DUM — duplex set of two universally ground bearings at medium preload.

What these specs mean in practice:

Contact Angle: 15°. The shallower angle favours speed and radial stiffness over thrust capacity, which is the usual choice for a high-speed spindle position.

Dynamic Load Rating: 77,400 N per bearing, rated over one million revolutions. Static Load Rating: 54,700 N.

Limiting Speed: 12,100 rpm grease; 24,200 rpm oil. Oil feed doubles the ceiling because it carries heat out of the contact as well as lubricating it.

Preload: Medium. Medium preload raises system stiffness above the light setting and holds shaft position more firmly under changing load, at the cost of some speed headroom.

Cage Material: Phenolic. A machined phenolic cage is light, damps vibration and holds oil in its own structure.

Mounting data:

Bore Type: Straight. Shaft backing shoulder diameter: 75.7 mm. Housing backing shoulder diameter: 109.7 mm. Maximum housing fillet radius the bearing corners will clear: 1.5 mm.

Mounting Arrangement: Universal — universally ground faces allow the pair to be set back-to-back, face-to-face or in tandem. The set is preload-established rather than clearance-set.

Quantity and configuration:

Unit Quantity: 2 Pcs. One duplex set of two universally ground bearings at medium preload, supplied together as the sale unit.

Interchange guidance:

Cross-Reference 1: Timken 7213C-T-P4S-DUM. Cross-Reference 2: FAG B7213-C-T-P4S-DUM. Cross-Reference 3: SKF 7213 CD/P4A DGB. Cross-Reference 4: NSK 7213CTRDUMP4. Cross-Reference 5: IBC 7213-C-T-P4S-DUM.

Cross-Reference 6: 3MM213WI-CR-DUM shares the 65 x 120 x 23 mm envelope at a 25° contact angle and is a related size rather than a direct interchange.

Searchable forms of the designation: 2MM213WICRDUM, 2MM213WI-CR-DUM, 2MM 213 WI CR DUM, 2MM213WIDUM, 7213C.