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Timken 3MM9118WI DUH super precision angular contact ball bearing configured as a duplex set with heavy preload (DUH). Meets ABEC 7 (P4S) precision standards for high rigidity and minimal runout. Suitable for demanding machine tool spindles, precision grinders, and high-speed applications where axial load capacity and accuracy are critical.
MODEL 3MM9118WI DUH
Returnable: Yes
0.9449 in C0 - Static Radial Rating (per row)
65800 N
1.8898 in World part number
7018E-T-P4S-DUH
14800 lbf C1 ISO - Dynamic Radial Rating (per row)
68500 N
15400 lbf Cage type
CR - Phenolic Outer Land Riding Cage Contact angle:25 Design units:Metric Inner ring backing diameter:99.7 mm
3.930 in Limiting Speed (Grease) (per row)
8300 rpm Limiting speed (oil):16600 RPM Manufacturing part number:3MM9118WI DUH O.D. (in):140 mm 5.5118 Outer ring backing diameter:130.9 mm
5.160 in Precision rating
ISO P4S (ABEC 7/9) Rows per set:Duplex Total width:48 mm
Ball type
Steel Bearing width:24 mm
Ball Type
STEEL
Bearing Width
24 mm 0.9449 in
Bore
90 mm
C0 - Static Radial Rating (per row)
65800 N 14800 lbf
C1 ISO - Dynamic Radial Rating (per row)
68500 N 15400 lbf
Cage Type
CR - Phenolic Outer Land Riding Cage
Ce - Dynamic Radial Rating (per row)
75200 N 16900 lbf
Contact Angle
25 º
d - Bore
90 mm
D - Outer Diameter
140 mm 5.5118 in
da - Inner Ring Backing Diameter
99.7 mm 3.930 in
Da - Outer Ring Backing Diameter
130.9 mm 5.160 in
Design Units
Metric
DOuter Ring Backing Diameter
130.9 mm 5.160 in
Dynamic Radial Rating (per row)
75200 N 16900 lbf
I.D.
90 mm
Inner Ring 'To Clear' Radius
1.5 mm 0.059 in
Inner Ring Backing Diameter
99.7 mm 3.930 in
Limiting Speed (Grease) (per row)
8300 rpm
Limiting Speed (Oil)
16600 rpm
Manufacturing Part Number
3MM9118WI DUH
Outer Diameter
140 mm 5.5118 in
Outer Ring 'To Clear' Radius
1.5 mm 0.059 in
Precision Rating
ISO P4S (ABEC 7/9)
R - Inner Ring "To Clear" Radius
1.5 mm 0.059 in
r - Outer Ring "To Clear" Radius
1.5 mm 0.059 in
Rows per Set
Duplex
Static Radial Rating (per row)
65800 N 14800 lbf
Total Width
48 mm 1.8898 in
World Part Number
7018E-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