Fafnir2MM9117WIDULAngular Contact Ball Bearing — 85 mm ID, 130 mm OD, 22 mm Width, 15° Contact Angle, Light Preload, Phenolic Cage, ABEC 7/9

Product Description

What this part is

Fafnir 2MM9117WICRSUL, a super-precision spindle angular contact ball bearing from Timken’s Fafnir 9100WI range. Bore: 85 mm. Outside Diameter: 130 mm. Overall Width: 22 mm. Total Width: 22 mm. Contact Angle: 15°. Precision Class: ABEC 7/9 (ISO P4S). Preload: light. Cage Type: CR, phenolic outer land riding. Cage Material: phenolic. Rolling Elements: steel balls. Number of Rows: 1. Design Units: Metric. Manufacturer Part Number: 2MM9117WI SUL. World Part Number: 7017C-T-P4S-SUL.

Decoding the designation

2MM — Fafnir super-precision spindle execution at a 15° contact angle, ground to ABEC 7/9 (ISO P4S) tolerance.

9117 — 9100WI dimension series, bore code 17. That is the ISO 7017 envelope: 85 mm bore, 130 mm outside diameter, 22 mm width.

WI — low shoulder on both rings, which is what allows the ball complement and the 15° angle to be ground into this section.

CR — phenolic outer land riding cage, guided on the outer ring lands.

SUL — single, universally ground, light preload. The ring faces are flush-ground to a common offset, so any two pieces clamped together arrive at the same light preload.

What these specs mean in practice

Dynamic Radial Load Rating (C1): 66,700 N (15,000 lbf). Dynamic Radial Load Rating, ISO method (C1 per row): 60,500 N (13,600 lbf). Static Radial Load Rating (C0): 58,700 N (13,200 lbf). Limiting Speed, grease: 9,700 rpm. Limiting Speed, oil: 19,400 rpm.

The 15° contact angle keeps the load path close to radial, which is what lets an 85 mm bore run to 9,700 rpm on grease and 19,400 rpm under oil. The phenolic outer land riding cage is light, adds little to ball-set inertia at speed and holds oil in its own porosity. Universal grinding is what makes this bearing stackable: two, three or four of them can be clamped in any of the standard arrangements and the resulting preload is set by the grinding rather than by shims.

Quantity and configuration

Unit Quantity: 1 Pc. One universally ground single-row bearing, 22 mm total width.

Mounting data

Shaft Backing Shoulder Diameter: 94.1 mm (3.710 in). Housing Backing Shoulder Diameter: 122.1 mm (4.810 in). Maximum Shaft Fillet Radius: 1 mm (0.039 in). Outer Ring To-Clear Radius: 1 mm (0.039 in).

Interchange guidance

Timken’s world part number for this bearing is 7017C-T-P4S-SUL. Searchable variants of the Fafnir number: 2MM9117WI-SUL, 2MM9117WICRSUL, 2MM-9117-WI-CR-SUL, 2MM 9117 WI SUL, 2MM-9117-WI-DUL, 7017C, 7017-C.

The 3MM9117WI on the same 85 x 130 x 22 mm envelope is the 25° build: more thrust capacity, lower speed.