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Timken 3MM9103WI SUM super precision angular contact ball bearing, 17mm bore, duplex medium preload (SUM), ABEC 7 (P4S) precision class. Configured as a matched pair for high-speed, high-rigidity machine tool spindles, precision grinders, and jig borers. Provides precise axial location and stiffness under combined radial and thrust loads.
MODEL 3MM9103WI SUM
Returnable: Yes
0.3937 in C0 - Static Radial Rating (per row)
3300 N
0.3937 in World part number
7003E-T-P4S-SUM
0.850 in Limiting Speed (Grease) (per row)
38800 RPM Limiting speed (oil):77600 rpm Manufacturing part number:3MM9103WI SUM O.D. (in):35 mm 1.378 Outer ring backing diameter:31.1 mm
1.230 in Rows per set
Single Total width:10 mm
1340 lbf Cage type
CR - Phenolic Outer Land Riding Cage Contact angle:25 Design units:Metric Inner ring backing diameter:21.5 mm
750 lbf C1 ISO - Dynamic Radial Rating (per row)
5990 N
Ball type
Steel Bearing width:10 mm
Ball Type
STEEL
Bearing Width
10 mm 0.3937 in
Bore
17 mm
C0 - Static Radial Rating (per row)
3300 N 750 lbf
C1 ISO - Dynamic Radial Rating (per row)
5990 N 1340 lbf
Cage Type
CR - Phenolic Outer Land Riding Cage
Ce - Dynamic Radial Rating (per row)
6600 N 1480 lbf
Contact Angle
25 º
d - Bore
17 mm
D - Outer Diameter
35 mm 1.3780 in
da - Inner Ring Backing Diameter
21.5 mm 0.850 in
Da - Outer Ring Backing Diameter
31.1 mm 1.230 in
Design Units
Metric
DOuter Ring Backing Diameter
31.1 mm 1.230 in
Dynamic Radial Rating (per row)
6600 N 1480 lbf
I.D.
17 mm
Inner Ring 'To Clear' Radius
0.30 mm 0.012 in
Inner Ring Backing Diameter
21.5 mm 0.850 in
Limiting Speed (Grease) (per row)
38800 rpm
Limiting Speed (Oil)
77600 rpm
Manufacturing Part Number
3MM9103WI SUM
Outer Diameter
35 mm 1.3780 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
Single
Static Radial Rating (per row)
3300 N 750 lbf
Total Width
10 mm 0.3937 in
World Part Number
7003E-T-P4S-SUM
EXTRA-LIGHT ISO 10 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.
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.
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SKU: 5066946
Best company to buy from
I always buy from MRO is a very reliable company to work with
Read more