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Timken 3MM9318WI QUM super precision angular contact ball bearing, quadruplex set with medium preload. ABEC 7 (P4S) precision class for high-rigidity machine tool spindles and precision grinding applications requiring exceptional rotational accuracy and load capacity.
MODEL 3MM9318WI QUM
Returnable: Yes
0.7087 in C0 - Static Radial Rating (per row)
41200 N
2.8348 in World part number
71918E-T-P4S-QUM
3.82 in Limiting Speed (Grease) (per row)
9300 rpm Limiting speed (oil):18600 rpm Manufacturing part number:3MM9318WI QUM O.D. (in):125 mm 4.9213 Outer ring backing diameter:118.5 mm
4.660 in Precision rating
ISO P4S (ABEC 7/9) Rows per set:Quadruplex Total width:72.000 mm
8670 lbf Cage type
CR - Phenolic Outer Land Riding Cage Contact angle:25 Design units:Metric Inner ring backing diameter:97 mm
9270 lbf C1 ISO - Dynamic Radial Rating (per row)
38500 N
Ball type
Steel Bearing width:18 mm
Ball Type
STEEL
Bearing Width
18 mm 0.7087 in
Bore
90 mm
C0 - Static Radial Rating (per row)
41200 N 9270 lbf
C1 ISO - Dynamic Radial Rating (per row)
38500 N 8670 lbf
Cage Type
CR - Phenolic Outer Land Riding Cage
Ce - Dynamic Radial Rating (per row)
42400 N 9540 lbf
Contact Angle
25 º
d - Bore
90 mm
D - Outer Diameter
125 mm 4.9213 in
da - Inner Ring Backing Diameter
97.0 mm 3.82 in
Da - Outer Ring Backing Diameter
118.5 mm 4.660 in
Design Units
Metric
DOuter Ring Backing Diameter
118.5 mm 4.660 in
Dynamic Radial Rating (per row)
42400 N 9540 lbf
I.D.
90 mm
Inner Ring 'To Clear' Radius
1 mm 0.039 in
Inner Ring Backing Diameter
97.0 mm 3.82 in
Limiting Speed (Grease) (per row)
9300 rpm
Limiting Speed (Oil)
18600 rpm
Manufacturing Part Number
3MM9318WI QUM
Outer Diameter
125 mm 4.9213 in
Outer Ring 'To Clear' Radius
1 mm 0.039 in
Precision Rating
ISO P4S (ABEC 7/9)
R - Inner Ring "To Clear" Radius
1 mm 0.039 in
r - Outer Ring "To Clear" Radius
1 mm 0.039 in
Rows per Set
Quadruplex
Static Radial Rating (per row)
41200 N 9270 lbf
Total Width
72.000 mm 2.8348 in
World Part Number
71918E-T-P4S-QUM
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.
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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