Fafnir2MM9117WISuper Precision Angular Contact Ball Bearing – Straight Bore, 85 mm ID, 130 mm OD, 22 mm Width, Open, 15° Contact Angle, Phenolic Outer-Land-Riding Cage, ISO P4S

Product Description

What this part is: Fafnir 2MM9117WI super precision angular contact ball bearing, single row, 9100WI spindle series. Manufacturer Part Number: 2MM9117WI. Bore: 85 mm. Outside Diameter: 130 mm. Bearing Width: 22 mm. Total Width: 22 mm. Number Of Rows: 1. Bore Type: Straight. Closure Type: Open. Rolling Elements: Steel balls. Design Units: Metric. Decoding the designation: Contact Angle: 15°, carried by the 2MM prefix. Series: 9100WI, which maps to the ISO 70xx light section, so the 9117 is a 7017 envelope at 85 x 130 x 22 mm. WI: low shoulder on both rings. CR: phenolic outer land riding cage. Precision Class: ISO P4S, equivalent to ABEC 7/9. Published ratings: Dynamic Radial Load Rating – 1M Revs (C1): 66,700 N (15,000 lbf). C1 ISO Dynamic Radial Rating, 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. These are single-bearing figures. Mounting dimensions: Max Shaft Fillet Radius: 1 mm. Outer Ring To Clear Radius: 1 mm. Shaft Backing Shoulder Diameter: 94.1 mm. Housing Backing Shoulder Diameter: 122.1 mm. What these specs mean in practice: A 15° contact angle is the high-speed setting in this family. More of the load line runs radially, the ball set does less centrifugal and gyroscopic work, and the bearing carries a higher limiting speed than the 25° execution on the same envelope. It suits grinding spindles, high-frequency heads and any position where speed and heat matter more than axial stiffness. Cage Type: CR, phenolic outer land riding. Cage Material: Phenolic. A machined phenolic laminate cage is light, so it loads the ball pockets very little at speed, it is self lubricating, and it damps rather than rings. Guidance on the outer ring land keeps it stable at high speed. Lubricant: grease or oil, and Timken publishes a limiting speed for each. Quantity and configuration: Unit Quantity: 1 Pc. Rows per Set: single. The designation is the plain 2MM9117WI base. Interchange guidance: Base Number: 7017. MPN Variants: 2MM9117WI, 2MM9117 WI, 2MM-9117-WI, 2-MM-9117-WI, 2MM9117WICR, 7017C, 7017-C. Same-envelope 15° super precision equivalents are written SKF 7017 CD/P4A, FAG B7017-C-T-P4S and NSK 7017CTRP4. Cage material and precision class vary between makers inside those designations. The line passed from Fafnir to Torrington to Timken, and Timken lists the 2MM9117WI CR family today.