Fafnir2MM9517WICRDULAngular Contact Ball Bearing – Straight Bore, 85 mm ID, 130 mm OD, 24 mm Width, Open, 15° Contact Angle, Light Preload, Single Universal.

Product Description

What this part is

Fafnir 2MM9517WI-CR-SUL super-precision angular contact ball bearing, 9500WI spindle range, 85 x 130 x 24 mm. Bore Diameter: 85 mm. Outside Diameter: 130 mm. Overall Width: 24 mm. Contact Angle: 15°. Precision Class: ABEC 7/9 / P4S. Preload: Light. Cage Material: Phenolic. Rolling Elements: Ball. Bore Type: Straight. Closure Type: Open. Bearing Material: Chrome steel. Number Of Rows: 1. Mounting Arrangement: Universal. Lubricant: grease or oil. Series: 9500WI. Base Number: 2MM9517WI.

Decoding the designation

2MM — 15° contact angle.

MM — Fafnir super-precision execution, ISO Class P4S, equivalent to ABEC 7/9.

9517 — 9500 metric spindle series, 85 mm bore.

WI — low shoulder on both rings.

CR — phenolic cage.

SUL — single universally ground bearing set for light preload.

What these specs mean in practice

Contact Angle: 15°. The shallower angle favours speed and radial stiffness over thrust capacity, which is the usual choice for a high-speed spindle position.

Precision Class: ABEC 7/9 / P4S. Tighter bore, outside diameter and raceway tolerances hold the shaft on centre and lower running vibration, which is what machine tool spindles are bought for.

Preload: Light. Light preload gives the highest speed capability of the preload ladder and the lowest heat generation.

Cage Material: Phenolic. A machined phenolic cage is light, damps vibration and holds oil in its own structure. Bearing Material: Chrome steel. Rolling Elements: Ball.

Mounting data

Bore Type: Straight, for a plain cylindrical shaft seat. Closure Type: Open, so the bearing takes lubricant directly from the spindle system. Lubricant: grease or oil.

Mounting Arrangement: Universal — universally ground faces allow this bearing to be stacked with further SUL bearings back-to-back, face-to-face or in tandem, taking up the light preload on assembly. The bearing is preload-established rather than clearance-set.

Quantity and configuration

Unit Quantity: 1 Pc. One single universally ground bearing.

Interchange guidance

The 9500WI range runs its own metric envelope set, and the 85 x 130 x 24 mm section here is specific to it. Order against the Fafnir designation.

Searchable forms of the designation: 2MM9517WICRSUL, 2MM9517WI-CR-SUL, 2MM 9517 WI CR SUL, 2MM9517WISUL, 2MM9517WICRDUL.