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NTN UC312-204D1 is a standard-duty insert bearing with a 2-1/4 in (57.15 mm) bore, double sealed for contamination resistance. The set screw locking mechanism secures the bearing to the shaft. Constructed with through hardened steel for durability in industrial conveyor and machinery applications.
MODEL UC312-204D1
$287.92 Each
Prices are subject to change
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Returnable:No
Bearing Type
Insert bearing
Enclosure
Double sealed
Height
5.118
I.D.
2.25 in
Length
5.118
Locking Device
Set Screw
Material
Through hardened steel
O.D.
5.1181 in
Width
2.7953
Technical Specifications
| Type | Insert Bearing |
|---|---|
| Bore Type | Round |
| Bearing Type | Ball Bearing |
| Material | Through Hardened Steel |
| Ball Material | Steel |
| Limiting Speed - Grease | 2400 RPM |
| Seal Type | Contact |
| Seal Material | Nitrile Rubber |
| Precision Rating | ISO Class 0 |
| Performance | Heavy Duty |
| Locking Device | Set Screw |
| Lubrication | Relubricatable |
| Basic Outer Ring | 312 |
| Static Load Rating | 11700 lbf52000 N52.00 kN |
| Dynamic Load Rating | 18400 lbf82000 N82.00 kN |
| Enclosure | Double Sealed |
| Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
| d | 2.25 in57.150 mm |
|---|---|
| D | 5.1181 in130.000 mm |
| C | 1.3780 in35.000 mm |
| B | 2.7953 in71.000 mm |
| r | 0.0984 in2.500 mm |
| ds | 1/2-20 UNF |
| G | 0.4724 in12.000 mm |
| d4 | 3.2559 in82.700 mm |
| S1 | 1.7717 in45.000 mm |
| S | 1.0236 in26.000 mm |
| F | 0.3543 in9.000 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.
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