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Timken 2MM9303WI TUH super precision angular contact ball bearing, triplex set with heavy preload (TUH), ABEC 7 (P4S) precision class. Designed for high-rigidity machine tool spindles and boring heads requiring maximum axial stiffness and minimal runout.
MODEL 2MM9303WI TUH
Returnable: Yes
0.2756 in C0 - Static Radial Rating (per row)
2800 N
0.790 in Limiting Speed (Grease) (per row)
50100 rpm Limiting speed (oil):100200 rpm Manufacturing part number:2MM9303WI TUH O.D. (in):30 mm 1.1811 Outer ring backing diameter:27.5 mm
0.8268 in World part number
71903C-T-P4S-TUH
1.080 in Rows per set
Triplex Total width:21 mm
1020 lbf Cage type
CR - Phenolic Outer Land Riding Cage Contact angle:15 Design units:Metric Inner ring backing diameter:20.0 mm
630 lbf C1 ISO - Dynamic Radial Rating (per row)
4520 N
Ball type
Steel Bearing width:7 mm
Ball Type
STEEL
Bearing Width
7 mm 0.2756 in
Bore
17 mm
C0 - Static Radial Rating (per row)
2800 N 630 lbf
C1 ISO - Dynamic Radial Rating (per row)
4520 N 1020 lbf
Cage Type
CR - Phenolic Outer Land Riding Cage
Ce - Dynamic Radial Rating (per row)
4970 N 1120 lbf
Contact Angle
15 º
d - Bore
17 mm
D - Outer Diameter
30 mm 1.1811 in
da - Inner Ring Backing Diameter
20.0 mm 0.790 in
Da - Outer Ring Backing Diameter
27.5 mm 1.080 in
Design Units
Metric
DOuter Ring Backing Diameter
27.5 mm 1.080 in
Dynamic Radial Rating (per row)
4970 N 1120 lbf
I.D.
17 mm
Inner Ring 'To Clear' Radius
0.30 mm 0.012 in
Inner Ring Backing Diameter
20.0 mm 0.790 in
Limiting Speed (Grease) (per row)
50100 rpm
Limiting Speed (Oil)
100200 rpm
Manufacturing Part Number
2MM9303WI TUH
Outer Diameter
30 mm 1.1811 in
Outer Ring 'To Clear' Radius
0.3 mm 0.012 in
R - Inner Ring "To Clear" Radius
0.30 mm 0.012 in
r - Outer Ring "To Clear" Radius
0.3 mm 0.012 in
Rows per Set
Triplex
Static Radial Rating (per row)
2800 N 630 lbf
Total Width
21 mm 0.8268 in
World Part Number
71903C-T-P4S-TUH
SPINDLE BEARINGS ULTRA-LIGHT ISO 19 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 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 | Allen Bradley |
| Model | 800H-QRAH2BA2 |
SKU: 5066946
Best company to buy from
I always buy from MRO is a very reliable company to work with
Read more