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Timken QMPR18J308SEM is a spherical roller mounted unit (SRB Housed Unit). This two-bolt pillow block (QMPR) features a frame size 18 housing and an imperial shaft bore. It utilizes SEM locking for shaft attachment. This heavy-duty mounted bearing is designed for applications requiring high load capacity and tolerance to misalignment, such as conveyors, fans, and industrial machinery.
MODEL QMPR18J308SEM
$899.80 Each
Prices are subject to change
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Typically Ships in: 1 day
Returnable:No
0.060 mm Shaft Size
3 1/2 in Shaft Tolerance:0.0030 in
0.076 mm Shaft size type
Imperial Y1 - Geometry Factor:2.90 Y2 - Geometry Factor:4.31 e - Geometry Factor:0.23
0.100 mm Pre Install Clearance Min
0.0024 in
20 mm Dimension R
0.32 in
235 mm Dimension J (Bolt Size)
0.75 in
285.8 mm Dimension D Min
9.25 in
8.1 mm Eng Internal Radial Clearance - Max
0.0039 Eng Internal Radial Clearance - Min:0.0024 Engineering group:Mounted Bearing Float:0.083 in
95.3 mm Dimension D Max
11.25 in
Bearing number
22218 C - Dynamic Load (Basic):79700 lbf 355000 N C0 - Static Load:87200 lbf 388000 N Dimension:3.75 in
Bearing Number
22218
C - Dynamic Load (Basic)
79700 lbf 355000 N
C0 - Static Load
87200 lbf 388000 N
Dimension A
3.75 in 95.3 mm
Dimension B
7.69 in 195.3 mm
Dimension C
4.76 in 120.9 mm
Dimension D Max
11.25 in 285.8 mm
Dimension D Min
9.25 in 235 mm
Dimension E
2.38 in 60.5 mm
Dimension F
13.63 in 346.2 mm
Dimension G
3.75 in 95.3 mm
Dimension H
1.56 in 39.6 mm
Dimension J (Bolt Size)
0.75 in 20 mm
Dimension K
1.44 in 36.6 mm
Dimension L
4.46 in 113.3 mm
Dimension M
2.59 in 65.8 mm
Dimension R
0.32 in 8.1 mm
Dimension S
4.03 in 102.4 mm
Dynamic Load (Basic)
79700 lbf
e - Geometry Factor
0.23
Eng Internal Radial Clearance - Max
0.0039
Eng Internal Radial Clearance - Min
0.0024
Eng Internal Radial ClearancMax
0.0039
Eng Internal Radial ClearancMin
0.0024
Engineering Group
Mounted Bearing
Float
0.083 in 2.108 mm
Full Timken Part Number
QMPR18J308SB QMPR18J308SC QMPR18J308SEB QMPR18J308SEC QMPR18J308SEM QMPR18J308SEN QMPR18J308SEO QMPR18J308SET QMPR18J308SM QMPR18J308SN QMPR18J308SO QMPR18J308ST
Geometry Factor
4.31
Grease Lubrication - B/C/O Seal
1000 rpm
Grease Lubrication - M/N Seal
1400 rpm
Grease Lubrication - T Seal
2000 rpm
Housing Construction
Four-Bolt Pillow Block
Locking Style
Eccentric
Oil Lubrication - B/C/O Seal
1000 rpm
Oil Lubrication - M/N Seal
1400 rpm
Oil Lubrication - T Seal
2400 rpm
Pre Install Clearance Max
0.0039 in 0.100 mm
Pre Install Clearance Min
0.0024 in 0.060 mm
Shaft Size
3 1/2 in
Shaft Size Type
Imperial
Shaft Tolerance
0.0030 in 0.076 mm
Static Load
87200 lbf
Y1 - Geometry Factor
2.90
Y2 - Geometry Factor
4.31
2-Bolt Pillow Block Bearings The **Timken QMPR18J308SEM SRB Housed Unit** is a robust and reliable solution designed for demanding applications in the automotive and industrial sectors. This 2-bolt pillow block bearing is engineered to provide superior support and stability, ensuring optimal performance under various load conditions. Timken, a leader in engineered bearings, leverages over a century of expertise to deliver high-quality components that enhance operational efficiency. ## Key Features • **Design**: The QMPR18J308SEM features a two-bolt mounting configuration that facilitates easy installation and alignment, making it suitable for a variety of applications. • **Material Composition**: Constructed from high-quality materials, this bearing unit is designed to withstand harsh operating environments, providing durability and longevity. • **Load Capacity**: Designed to handle radial loads effectively, this bearing unit supports a maximum radial load of up to 1, 800 pounds. • **Seal Type**: Equipped with a premium sealing system, it effectively prevents contamination and retains lubrication, enhancing service life. • **Dimensions**: The bearing has a housing width of 3.08 inches and a housing length of 5.5 inches, making it compact yet efficient for space-constrained environments. ## Applications • **Industrial Machinery**: Ideal for use in conveyor systems, material handling equipment, and other industrial applications that require reliable motion support. • **Automotive**: Perfect for automotive applications, including wheel bearings and suspension systems, where precision and durability are paramount. • **Compatibility**: This bearing unit is designed to fit seamlessly with a wide range of shaft sizes, ensuring broad application in various mechanical assemblies. ## Benefits • **Enhanced Reliability**: With Timken's reputation for quality, users can trust that this bearing will perform consistently, reducing downtime and maintenance costs. • **Operational Efficiency**: The efficient design minimizes friction and wear, resulting in smoother operation and extended service intervals. • **Easy Installation**: The two-bolt design simplifies installation and maintenance, making it accessible for technicians and reducing labor costs. --- *Product information compiled with AI assistance for reference purposes.*
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.
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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