Fafnir2MM9108WI DUMAngular Contact Ball Bearing – 40 mm ID, 68 mm OD, 15 mm Width, 15° Contact Angle, ABEC 7 / P4

Product Description

What this part is:

Fafnir 2MM9108WI-DUM super-precision angular contact ball bearing, universal duplex pair of 2 pieces. Each bearing: 40 mm bore, 68 mm outside diameter, 15 mm width. ISO equivalent size 7008C. Steel balls in a machined phenolic cage, open construction. GTIN: 087796072305.

Decoding the designation:

2MM — Fafnir super-precision family with a 15° contact angle and P4 precision class (ABEC 7).

9108 — Fafnir 9100 series, the ISO 7008 envelope: 40 x 68 x 15 mm.

WI — low shoulder on both rings, the form used for duplex sets.

DU — universal duplex: two single-row bearings ground to be mounted in any combination.

M — medium preload.

Specifications:

Bore Diameter: 40 mm. Outside Diameter: 68 mm. Width: 15 mm per bearing. Contact Angle: 15°. Precision Class: ABEC 7 / P4. Preload: Medium. Rolling Elements: Ball. Cage Material: Phenolic. Closure Type: Open.

Dynamic Load Rating (C1, 1 million revolutions): 21,900 N. Static Load Rating (C0): 14,900 N. Limiting Speed: 19,900 rpm grease; 39,800 rpm oil. Weight of the matched pair: 0.374 kg (0.82 lb).

Dimensions and mounting:

Shaft Backing Shoulder Diameter: 45.7 mm. Housing Backing Shoulder Diameter: 62.2 mm. Maximum Fillet Radius on the Mating Part: 1 mm. Series: Fafnir 9100 (ISO 70 light series).

Compatibility and replacement:

Cross-references: SKF 7008 CD/P4ADGB; NSK 7008CTRDUMP4Y. Related part: 2MM9108WI-DUH, the same bearing with heavy preload. CAD model and data sheet: available from Timken (cad.timken.com).

Frequently asked questions:

What size is the Fafnir 2MM9108WI-DUM?

Each bearing is 40 mm bore, 68 mm outside diameter and 15 mm wide, the ISO 7008 size.

What does DUM mean in this designation?

DU is a universal duplex pair and M is medium preload.

What contact angle and speed rating does it have?

The contact angle is 15°. Limiting speed is 19,900 rpm on grease and 39,800 rpm on oil.