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Timken 3MM9121WI DUH super precision angular contact ball bearing, duplex set with heavy preload (DUH). P4S-class precision meets ABEC 7/9 standards for high rigidity and minimal runout. Suitable for machine tool spindles, precision grinders, and high-speed applications requiring exact axial location and load capacity.
MODEL 3MM9121WI DUH
Returnable: Yes
1.0236 in C0 - Static Radial Rating (per row)
84500 N
18900 lbf Cage type
CR - Phenolic Outer Land Riding Cage Contact angle:25 Design units:Metric Inner ring backing diameter:115.7 mm
19000 lbf C1 ISO - Dynamic Radial Rating (per row)
84000 N
2.0472 in World part number
7021E-T-P4S-DUH
4.560 in Limiting Speed (Grease) (per row)
7100 RPM Limiting speed (oil):14200 rpm Manufacturing part number:3MM9121WI DUH O.D. (in):160 mm 6.2992 Outer ring backing diameter:150 mm
5.910 in Precision rating
ISO P4S (ABEC 7/9) Rows per set:Duplex Total width:52 mm
Ball type
Steel Bearing width:26 mm
Ball Type
STEEL
Bearing Width
26 mm 1.0236 in
Bore
105 mm
C0 - Static Radial Rating (per row)
84500 N 19000 lbf
C1 ISO - Dynamic Radial Rating (per row)
84000 N 18900 lbf
Cage Type
CR - Phenolic Outer Land Riding Cage
Ce - Dynamic Radial Rating (per row)
92100 N 20700 lbf
Contact Angle
25 º
d - Bore
105 mm
D - Outer Diameter
160 mm 6.2992 in
da - Inner Ring Backing Diameter
115.7 mm 4.560 in
Da - Outer Ring Backing Diameter
150 mm 5.910 in
Design Units
Metric
DOuter Ring Backing Diameter
150 mm 5.910 in
Dynamic Radial Rating (per row)
92100 N 20700 lbf
I.D.
105 mm
Inner Ring 'To Clear' Radius
2 mm 0.079 in
Inner Ring Backing Diameter
115.7 mm 4.560 in
Limiting Speed (Grease) (per row)
7100 rpm
Limiting Speed (Oil)
14200 rpm
Manufacturing Part Number
3MM9121WI DUH
Outer Diameter
160 mm 6.2992 in
Outer Ring 'To Clear' Radius
2 mm 0.079 in
Precision Rating
ISO P4S (ABEC 7/9)
R - Inner Ring "To Clear" Radius
2 mm 0.079 in
r - Outer Ring "To Clear" Radius
2 mm 0.079 in
Rows per Set
Duplex
Static Radial Rating (per row)
84500 N 19000 lbf
Total Width
52 mm 2.0472 in
World Part Number
7021E-T-P4S-DUH
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