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Timken 2MMC209WI DUM is a super precision angular contact ball bearing designed for high-speed machine tool spindles. This duplex set (DUM) is configured for medium preload, offering a balance of rigidity and speed capability. It features a 45mm bore and meets ABEC 7 (P4S) precision standards for minimal runout and vibration in demanding applications like grinders and jig borers.
MODEL 2MMC209WI DUM
Returnable: Yes
0.748 in C0 - Static Radial Rating (per row)
25600 N
1.496 in World part number
C7209C-T-P4S-DUM
2.060 in Limiting Speed (Grease) (per row)
21000 rpm Limiting speed (oil):42000 rpm Manufacturing part number:2MMC209WI DUM O.D. (in):85 mm 3.3465 Outer ring backing diameter:78.2 mm
3.080 in Precision rating
ISO P4S (ABEC 7/9) Rows per set:Duplex Total width:38 mm
5760 lbf C1 ISO - Dynamic Radial Rating (per row)
41100 N
9270 lbf Cage type
CR - Phenolic Outer Land Riding Cage Contact angle:15 Design units:Metric Inner ring backing diameter:52.3 mm
Ball type
Ceramic Bearing width:19 mm
Ball Type
Ceramic
Bearing Width
19 mm 0.748 in
Bore
45 mm
C1 ISO - Dynamic Radial Rating (per row)
41100 N 9270 lbf
Cage Type
CPhenolic Outer Land Riding Cage
Contact Angle
15 º
Design Units
Metric
DOuter Ring Backing Diameter
78.2 mm 3.080 in
Dynamic Radial Rating (per row)
45200 N 10200 lbf
I.D.
45 mm
Inner Ring 'To Clear' Radius
1 mm 0.039 in
Inner Ring Backing Diameter
52.3 mm 2.060 in
Limiting Speed (Grease) (per row)
21000 rpm
Limiting Speed (Oil)
42000 rpm
Manufacturing Part Number
2MMC209WI DUM
Outer Diameter
85 mm 3.3465 in
Outer Ring 'To Clear' Radius
1 mm 0.039 in
Precision Rating
ISO P4S (ABEC 7/9)
Rows per Set
Duplex
Static Radial Rating (per row)
25600 N 5760 lbf
Total Width
38 mm 1.496 in
World Part Number
C7209C-T-P4S-DUM
LIGHT ISO 02 SERIES
HIGH PRECISION MV
Running accuracy, performance and dimensional controls conform to ABEC 7 (ISO P4) requirements.
SUPER PRECISION MM
Running accuracy and performance meet ABEC 9 (ISO P2) levels. Other features conform to ABEC 7 (ISO P4) requirements.
WI CONSTRUCTION
- Incorporates low shoulder on non-thrust side of both inner and outer rings.
- Balls separated by one-piece cage piloted against a ground thrust shoulder land of the outer ring.
- Optional one-piece cage piloted on the ball available with MV (P4) product.
SKU: 5066946
Best company to buy from
I always buy from MRO is a very reliable company to work with
Read moreHow do I choose the right type of bearing for my application?
Start with the load and how it’s applied. You need to know if you’re dealing with radial loads, axial loads, or a mix of both. Then look at speed, operating environment, and space constraints. For example, ball bearings are great for high speed and lighter loads, while roller bearings handle heavier loads but usually at lower speeds. If there’s contamination, moisture, or heat involved, you may need sealed bearings or specific materials. In most cases, the right choice comes down to matching load type, speed, and environment to the bearing design.
What is the difference between deep groove and angular contact ball bearings?
Deep groove ball bearings are the most common type. They’re designed to handle mainly radial loads, but they can also take some axial load in both directions. They’re simple, versatile, and used in everything from motors to conveyors. Angular contact ball bearings are built for combined loads, especially where there’s significant axial force in one direction. They’re often used in pairs and are common in higher precision or higher load applications like pumps and gearboxes. If your load is mostly radial, go deep groove. If axial load matters more, angular contact is usually the better choice.
| Brand | Gates Rubber |
| Model | 124L100 |
| Brand | Timken Belts |
| Model | RCP173-10 |
SKU: 5066946
Best company to buy from
I always buy from MRO is a very reliable company to work with
Read more