We never sell your data to third parties
Timken 3MM9128WI QUH super precision angular contact ball bearing, quadruplex set with heavy preload (QUH), ABEC 7 (P4S) precision class. Designed for machine tool spindles and high-speed, high-rigidity applications requiring maximum axial and radial load capacity. Matched set ensures consistent preload and runout control for optimal spindle performance.
MODEL 3MM9128WI QUH
Returnable: Yes
1.2992 in C0 - Static Radial Rating (per row)
137400 N
28300 lbf Cage type
CR - Phenolic Outer Land Riding Cage Contact angle:25 Design units:Metric Inner ring backing diameter:154.3 mm
30900 lbf C1 ISO - Dynamic Radial Rating (per row)
126000 N
5.1968 in World part number
7028E-T-P4S-QUH
6.080 in Limiting Speed (Grease) (per row)
5300 RPM Limiting speed (oil):10600 RPM Manufacturing part number:3MM9128WI QUH O.D. (in):210 mm 8.2677 Outer ring backing diameter:196.5 mm
7.740 in Precision rating
ISO P4S (ABEC 7/9) Rows per set:Quadruplex Total width:132 mm
Ball type
Steel Bearing width:33 mm
Ball Type
STEEL
Bearing Width
33 mm 1.2992 in
Bore
140 mm
C0 - Static Radial Rating (per row)
137400 N 30900 lbf
C1 ISO - Dynamic Radial Rating (per row)
126000 N 28300 lbf
Cage Type
CR - Phenolic Outer Land Riding Cage
Ce - Dynamic Radial Rating (per row)
138300 N 31100 lbf
Contact Angle
25 º
d - Bore
140 mm
D - Outer Diameter
210.000 mm 8.2677 in
da - Inner Ring Backing Diameter
154.3 mm 6.080 in
Da - Outer Ring Backing Diameter
196.5 mm 7.740 in
Design Units
Metric
DOuter Ring Backing Diameter
196.5 mm 7.740 in
Dynamic Radial Rating (per row)
138300 N 31100 lbf
I.D.
140 mm
Inner Ring 'To Clear' Radius
2 mm 0.079 in
Inner Ring Backing Diameter
154.3 mm 6.080 in
Limiting Speed (Grease) (per row)
5300 rpm
Limiting Speed (Oil)
10600 rpm
Manufacturing Part Number
3MM9128WI QUH
Outer Diameter
210.000 mm 8.2677 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
Quadruplex
Static Radial Rating (per row)
137400 N 30900 lbf
Total Width
132 mm 5.1968 in
World Part Number
7028E-T-P4S-QUH
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.
- 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 | IKO Bearing |
| Model | GE300ES |
| Brand | JW Winco |
| Model | 352.1-25-13-1/4-55 |
| Brand | Formsprag |
| Model | CL42190-3 |
| Brand | Harwal |
| Model | 2.375 x 3.125 x .500BDL |
| Brand | Rocky Mountain Twist |
| Model | 95000515 |
SKU: 5066946
Best company to buy from
I always buy from MRO is a very reliable company to work with
Read more