Fafnir2MM9108WIDUHAngular Contact Ball Bearing – Straight Bore, 40 mm ID, 68 mm OD, 15 mm Width, Open, 15° Contact Angle, Heavy Preload.

Product Description

What this part is

Fafnir 2MM9108WI-DUH matched duplex pair of super-precision angular contact spindle ball bearings, built by The Timken Company. Series: 9100WI. Bore: 40 mm. Outside Diameter: 68 mm. Bearing Width: 15 mm per bearing. Total Width: 30 mm for the pair. Contact Angle: 15°. Precision Rating: ISO P4S (ABEC 7/9). Preload: Heavy. Cage Type: CR – Phenolic Outer Land Riding Cage. Cage Material: Phenolic. Rolling Elements: steel balls. Bore Type: Straight. Closure Type: Open. Rows per Set: Duplex. Design Units: Metric. Timken’s world part number for this set is 7008C-T-P4S-DUH.

Decoding the designation

The 2MM prefix gives a 15° contact angle and ISO P4S accuracy. 9108 in the 9100WI series is the ISO 7008 envelope. WI denotes a low shoulder on both rings. CR is the phenolic outer-land-riding cage. DU marks a duplex set, and the trailing H sets heavy preload.

What these specs mean in practice

Dynamic Radial Load Rating (C1): 21,900 N (4,920 lbf) per bearing. C1 ISO Dynamic Radial Rating per row: 19,900 N (4,470 lbf). Static Radial Load Rating (C0): 14,900 N (3,360 lbf) per bearing. Limiting Speed – Grease: 19,900 rpm. Limiting Speed – Oil: 39,800 rpm. A 15° contact angle favours speed and radial stiffness. Heavy preload gives the highest axial and radial rigidity of the three grades and the tightest running position, at the cost of heat and speed.

Quantity and configuration

Unit Quantity: 2 Pcs. Arrangement / Configuration: Matched duplex pair. Total Width: 30 mm assembled. The two bearings are ground as a set and mount together at the published heavy preload.

Mounting data

Max Shaft Fillet Radius: 1 mm (0.039 in). Outer Ring To Clear Radius: 1 mm (0.039 in). Shaft Backing Shoulder Diameter: 45.7 mm (1.800 in). Housing Backing Shoulder Diameter: 62.2 mm (2.450 in).

Interchange guidance

Cross-references: 7008C-T-P4S-DUH, SKF 7008 CDGC/P4A, FAG B7008-C-T-P4S-UL, NSK 7008CTYNDUHP4. Searchable forms of the designation: 2MM9108WIDUH, 2MM9108WI-DUH, 2MM 9108 WI CR DUH, 7008C.