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NTN UCS211-203LD1N is a bearing insert with a wide inner ring and cylindrical outer diameter featuring a snap ring groove. It has a 55 mm bore, set screw locking, and a single FKM/Viton seal for high-temperature resistance. This insert is designed for use in mounted bearing units requiring corrosion resistance and reliable sealing in demanding industrial environments.
MODEL UCS211-203LD1N
$100.36 Each
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a (in)
0.1732
b (in)
0.1122
B (in)
2.1890
Bearing Type
Ball Bearing
Bore type
Round
Bore Type
Round
C (in)
0.9843
D (in)
3.9370
d (in)
2.1875
D1
3.8110 in
d4
2.7165 in
DS
5/16-24 UNF
Dynamic load rating
9800 lbf
Dynamic Load Rating
9800 lbf
Enclosure
Double Sealed
F (in)
0.2323
G (in)
0.3543
I.D.
2.1875 in
Limiting speed - grease
2900 RPM
Limiting Speed - Grease
2900 RPM
Locking device
2 -120° set screw
Locking Device
2 -120° Set Screw
Lubrication
Re-Lubricatable
Material
Through Hardened Steel
O.D.
3.937 in
Operating temperature range
-40 to 250 ºF
Operating Temperature Range
-40 to 250 °F
Performance
Standard Duty
r (in)
0.0787
r1
0.0787 in
S
0.8740 in
S1
1.3150 in
Seal material
Nitrile rubber
Seal Material
Nitrile Rubber
Seal type
Contact
Seal Type
Contact
Static load rating
6550 lbf
Static Load Rating
6550 lbf
Type
Insert Bearing
Technical Specifications
Type | Insert Bearing |
Bore Type | Round |
Bearing Type | Ball Bearing |
Material | Through Hardened Steel |
Limiting Speed - Grease | 2900 RPM |
Seal Type | Contact |
Seal Material | Nitrile Rubber |
Performance | Standard Duty |
Locking Device | 2 -120° Set Screw |
Lubrication | Re-Lubricatable |
Static Load Rating | 6550 lbf29200 N29.20 kN |
Dynamic Load Rating | 9800 lbf43500 N43.50 kN |
Enclosure | Double Sealed |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 2.1875 in55.563 mm |
D | 3.9370 in100.000 mm |
C | 0.9843 in25.000 mm |
B | 2.1890 in55.600 mm |
r | 0.0787 in2.000 mm |
r1 | 0.0787 in2.000 mm |
ds | 5/16-24 UNF |
G | 0.3543 in9.000 mm |
d4 | 2.7165 in69.000 mm |
S1 | 1.3150 in33.400 mm |
S | 0.8740 in22.200 mm |
a | 0.1732 in4.400 mm |
b | 0.1122 in2.850 mm |
D1 | 3.8110 in96.800 mm |
F | 0.2323 in5.900 mm |
How 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.
