FafnirMM9122KCRDeep Groove Ball Bearing – 110 mm ID, 170 mm OD, 28 mm Width, Open, Phenolic Cage, Super-Precision Spindle Grade ABEC 7/9

Product Description

What this part is

Fafnir MM9122K-CR super-precision spindle deep groove ball bearing, 9100K series, 110 x 170 x 28 mm. Bore Diameter: 110 mm. Outside Diameter: 170 mm. Overall Width: 28 mm. Precision Class: ABEC 7/9 / P4S. Cage Material: Phenolic. Rolling Elements: Ball. Bearing Material: Chrome steel. Bore Type: Straight. Closure Type: Open. Number Of Rows: 1. Internal Clearance: CN. Item Weight: 1.882 kg (4.15 lb).

Decoding the designation

MM — Fafnir super-precision spindle execution, ISO P4S tolerance class.

9122 — 9100K series, bore code 22, giving a 110 mm bore.

K — spindle deep groove Conrad-type construction.

CR — phenolic cage.

What these specs mean in practice

Dynamic Load Rating: 83,400 N. Static Load Rating: 66,700 N. Limiting Speed: 6,840 rpm grease; 13,680 rpm oil. Lubricant: grease or oil.

The deep groove raceway takes radial load and axial load from either direction, so one bearing locates a shaft in both directions. Held to P4S tolerance, it runs with the shaft and housing location a machine tool spindle needs.

The phenolic cage runs quietly at high surface speed and holds lubricant, which suits continuous spindle duty.

Mounting data

Shaft Backing Shoulder Diameter: 122.3 mm (4.820 in). Housing Backing Shoulder Diameter: 158.4 mm (6.240 in). Maximum housing fillet radius that the bearing corners will clear: 2 mm (0.079 in).

Quantity and configuration

Unit Quantity: 1 Pc. Rows per set: single.

Interchange guidance

Timken MM9122K is the same bearing in the base cage execution. The standard-precision deep groove 6022, in SKF, NSK and FAG form, shares the 110 x 170 x 28 mm envelope and the deep groove raceway at a looser tolerance class and a different cage. The carton also carries the legacy Fafnir number 122; searchable forms include MM9122KCR, MM 9122 K CR, MM9122K-CR and MM9122K.