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Timken 2MM309WI DUH is a super precision angular contact ball bearing configured as a duplex set with heavy preload (DUH). This P4S/ABEC 7 precision class bearing is designed for high-rigidity machine tool spindles, boring heads, and other applications requiring maximum axial stiffness and minimal runout. The matched duplex pair is supplied with a pre-established heavy preload for simplified installation and consistent performance.
MODEL 2MM309WI DUH
Returnable: Yes
0.9843 in C0 - Static Radial Rating (per row)
38700 N
1.9686 in World part number
7309C-T-P4S-DUH
13600 lbf Cage type
CR - Phenolic Outer Land Riding Cage Contact angle:15 Design units:Metric Inner ring backing diameter:55.4 mm
2.180 in Limiting Speed (Grease) (per row)
15100 RPM Limiting speed (oil):30200 RPM Manufacturing part number:2MM309WI DUH O.D. (in):100 mm 3.937 Outer ring backing diameter:90.2 mm
3.550 in Precision rating
ISO P4S (ABEC 7/9) Rows per set:Duplex Total width:50 mm
8650 lbf C1 ISO - Dynamic Radial Rating (per row)
60500 N
Ball type
Steel Bearing width:25 mm
Ball Type
STEEL
Bearing Width
25 mm 0.9843 in
Bore
45 mm
C1 ISO - Dynamic Radial Rating (per row)
60500 N 13600 lbf
Cage Type
CPhenolic Outer Land Riding Cage
Contact Angle
15 º
Design Units
Metric
DOuter Ring Backing Diameter
90.2 mm 3.550 in
Dynamic Radial Rating (per row)
66500 N 15000 lbf
I.D.
45 mm
Inner Ring 'To Clear' Radius
1.5 mm 0.059 in
Inner Ring Backing Diameter
55.4 mm 2.180 in
Limiting Speed (Grease) (per row)
15100 rpm
Limiting Speed (Oil)
30200 rpm
Manufacturing Part Number
2MM309WI DUH
Outer Diameter
100 mm 3.9370 in
Outer Ring 'To Clear' Radius
1.5 mm 0.059 in
Precision Rating
ISO P4S (ABEC 7/9)
Rows per Set
Duplex
Static Radial Rating (per row)
38700 N 8650 lbf
Total Width
50 mm 1.9686 in
World Part Number
7309C-T-P4S-DUH
MEDIUM ISO 03 SERIES
SUPER PRECISION MMV
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 outer rings.
- Balls separated by one-piece cage piloted against a ground thrust shoulder land of the outer ring.
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 | WEG |
| Model | MW500A04P3S2DB66C2A70G2 |
| Brand | Irwin Tools |
| Model | 7245 |
SKU: 5066946
Best company to buy from
I always buy from MRO is a very reliable company to work with
Read more