Fafnir3MM9120WI DUMSuper-Precision Angular Contact Ball Bearing – Straight Bore, 100 mm ID, 150 mm OD, 24 mm Width, Open, 25° Contact Angle, Medium Preload, Phenolic Cage.

Product Description

What this part is:

Fafnir (Timken) 3MM9120WI-DUM super-precision angular contact ball bearing, 9100 series (ISO 7020 envelope), 100 x 150 x 24 mm, 25° contact angle, medium preload, phenolic cage, universally ground for duplex mounting. Unit Quantity: 1 Pc.

Decoding the designation:

3MM — Fafnir super-precision angular contact bearing with a 25° contact angle; MM precision class P4 (ABEC 7).

9120 — Fafnir 9100 series, ISO 70xx envelope; bore code 20 x 5 = 100 mm, so a 9120 carries the 7020 envelope.

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

DUM — duplex universally ground, medium preload.

CR — phenolic cage (carried in the variant 3MM9120WICRDUM).

Specifications:

Bore Diameter: 100 mm. Outside Diameter: 150 mm. Overall Width: 24 mm. Contact Angle: 25°. Precision Class: ABEC 7 / P4. Preload: Medium. Number Of Rows: 1. Rolling Elements: Steel ball. Bore Type: Straight. Closure Type: Open. Cage Material: Phenolic. Cage Type: CR, phenolic outer land riding. Bearing Material: Chrome bearing steel. Arrangement / Configuration: Universally ground for duplex mounting. Series: 9100 (ISO 70). Timken World Part Number: 7020E-T-P4S-DUM.

Dynamic Radial Load Rating (C1), per bearing: 79,200 N (17,800 lbf). Dynamic Radial Load Rating (C1 ISO, per row): 71,800 N (16,200 lbf). Static Radial Load Rating (C0), per bearing: 73,400 N (16,500 lbf). Limiting Speed, grease: 8,300 rpm. Limiting Speed, oil: 15,000 rpm.

Dimensions and mounting:

Shaft Backing Shoulder Diameter: 109.9 mm (4.330 in). Housing Backing Shoulder Diameter: 140.8 mm (5.550 in). Maximum Shaft Fillet Radius: 1.5 mm (0.059 in). Outer Ring To Clear Radius: 1.5 mm (0.059 in).

Compatibility and replacement:

Cross-References, 100 x 150 x 24 mm with 25° contact angle: SKF 7020 ACD/P4A, FAG B7020-E-T-P4S-UM, NSK 7020A5, Timken 7020E. Other writings of this designation: 3MM9120WIDUM, 3MM9120WID-UM, 3MM 9120 WI DUM, 3MM-9120-WI-DUM, 3MM9120WICRDUM, 7020E-T-P4S-DUM, 7020A5, 7020ACD, 7020E, 3MM9120WI.

Frequently asked questions:

What is the contact angle of the Fafnir 3MM9120WI-DUM?

Contact Angle: 25°.

What are the dimensions of the Fafnir 3MM9120WI-DUM?

Bore Diameter: 100 mm. Outside Diameter: 150 mm. Overall Width: 24 mm.

What does DUM mean on the Fafnir 3MM9120WI-DUM?

DUM denotes a duplex universally ground bearing with medium preload.