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Timken MM9108K is a super precision angular contact ball bearing (P4S) designed for high-speed machine tool spindles and precision applications. It features a phenolic inner land riding cage (CR type) for reduced friction and heat generation. The bearing has a dynamic load rating of 4180 lbf and a static load rating of 2600 lbf, suitable for demanding radial and axial loads in a duplex or triplex mounted configuration.
MODEL MM9108K
$453.22 Each
Prices are subject to change
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Returnable: Yes
0.5906 in C0 - Static Radial Rating (per row)
11600 N
1.800 in Limiting Speed (Grease) (per row)
18200 RPM Limiting speed (grease):18200 RPM Limiting speed (oil):36400 RPM O.D. (in):68 mm 2.6772 Outer ring to clear radius:0.039 in Outer ring backing diameter:62.2 mm
2.450 in Precision class
ISO P4S (ABEC 7/9) Rows per set:Single Static radial rating:2600 lbf
2600 lbf C1 ISO - Dynamic Radial Rating (per row)
16900 N
3800 lbf Cage type
CR - Phenolic Inner Land Riding Cage Design units:Metric Dynamic radial rating:4180 lbf Inner ring to clear radius:0.039 in Inner ring backing diameter:45.7 mm
Ball diameter
0.312500 in
Ball type
Steel
Bearing width
0.5906 in
Cage type
CR - Phenolic Inner Land Riding Cage
Design units
METRIC
Dynamic radial rating
4180 lbf
I.D.
1.5748 in
Inner ring "to clear" radius
0.039 in
Inner ring backing diameter
1.800 in
Limiting speed (grease)
18200 rpm
Limiting speed (oil)
36400 rpm
O.D.
2.6772 in
Outer ring "to clear" radius
0.039 in
Outer ring backing diameter
2.450 in
Precision class
ISO P4S (ABEC 7/9)
Static radial rating
2600 lbf
Radial ball bearings consist of an inner and outer ring with a cage containing a complement of precision balls. The standard Conrad-type bearing has a deep-groove construction capable of handling radial and axial loads from either direction in versatile designs that permit relatively high-speed operation.
In addition to standard single-row deep groove bearings, Timken offers special designs, including a maximum capacity series and an extra large (XLS) radial series bearing.
Size range: 3 mm - 600 mm (0.12 in. - 23.62 in.) bore
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