Fafnir2MM9122WICR-SULSuper Precision Angular Contact Ball Bearing 110x170x28 mm, 15° Contact Angle, Universally Ground Single, Light Preload, Phenolic Cage, 1 Pc

Product Description

What this part is

Fafnir 2MM9122WICR-SUL super-precision angular contact ball bearing, manufactured by The Timken Company. Bore: 110 mm (4.3307 in). Outside Diameter: 170 mm (6.693 in). Bearing Width: 28 mm (1.102 in). Total Width: 28 mm. Rows per Set: single. Contact Angle: 15°. Precision Rating: ISO P4S (ABEC 7/9). Preload: light. Cage Type: CR — Phenolic Outer Land Riding Cage. Ball Type: steel. Closure Type: open. Design Units: metric. Series: Fafnir 9100WI, the ISO 7022 section. Timken Manufacturing Part Number: 2MM9122WI SUL. Timken World Part Number: 7022C-T-P4S-SUL.

Published ratings

Dynamic Radial Load Rating, 1M revolutions (C1): 109 400 N (24 600 lbf), single bearing. Dynamic Radial Load Rating, ISO C1 per row: 99 300 N (22 300 lbf). Static Radial Load Rating (C0): 102 700 N (23 100 lbf). Limiting Speed, grease: 7 500 rpm. Limiting Speed, oil: 15 000 rpm.

Decoding the designation

2MM: 15° contact angle in the Fafnir super-precision scheme. MM: the super-precision execution, Precision Class P4S. 9122: the 9100WI light dimension series with ISO bore code 22, giving the 7022 section at 110 x 170 x 28 mm. WI: low shoulder on both rings. CR: phenolic outer land riding cage. SU: single universally ground. L: light preload. Searchable forms include 2MM9122WICR-SUL, 2MM9122WICRSUL, 2MM-9122-WI-CR-SUL, 2MM 9122 WI CR SUL and 7022C-T-P4S-SUL.

What these specs mean in practice

A 15° contact angle carries less thrust and permits higher speed than a 25° angle, which is why it is the grinding and high-speed spindle grade. Light preload holds running torque and heat generation down while removing internal clearance. Universal grinding means the bearing reaches its stated preload when clamped solid against any other universally ground bearing of the same designation, so spindle stacks of two, three or four are built from singles. The phenolic outer land riding cage is low in mass and retains oil in the resin.

Mounting dimensions

Max Shaft Fillet Radius: 2 mm (0.079 in). Shaft Backing Shoulder Diameter: 122.3 mm (4.820 in). Housing Backing Shoulder Diameter: 158.4 mm (6.240 in). Outer Ring To-Clear Radius: 2.0 mm (0.079 in). Bore form is straight.

Quantity and configuration

Unit Quantity: 1 Pc. Single bearing, universally ground, stackable back to back, face to face or in tandem.

Interchange guidance

Same-specification equivalents at 15°, super precision, light preload: FAG B7022-C-T-P4S-UL, NSK 7022 CTR SUL P4, RHP 7022CTSULP4. A 7022 AC or A5 execution is a related size at 25° or 30° and changes the thrust and speed balance. 2MM9122WICR-SUM carries the same envelope and angle at medium preload; 2MM9122WICR-DUL is the factory-matched duplex pair of this specification.