IKO BR243320UU Needle Roller Bearing without Inner Ring 38.1 x 52.388 x 31.75 mm
Available
IKO BR UU needle roller bearings are machined type caged bearings without an inner ring, in inch sizes, with seals on both sides (UU). This page lists 11 sizes: 15.875 to 76.2 mm (5/8 to 3 in) shaft, 28.575 to 95.25 mm (1 1/8 to 3 3/4 in) outside diameter and 25.4 to 44.45 mm wide.
Machined type needle roller bearings have a low sectional height and large load ratings. The outer ring is rigid and can be used even in light alloy housings. Both sides carry seals made of special synthetic rubber, which keep dust out and hold the grease in, and the bearing is supplied prepacked with grease.
In the model number the figures after BR are the shaft diameter, outside diameter and width in sixteenths of an inch, so BR101816UU is 5/8 x 1 1/8 x 1 in. Without an inner ring the shaft is the raceway, so it needs to be heat-treated and ground.
Where this product is used
- Inch size shafts that are hardened and ground
- Positions where dust may reach the bearing
- Compact shaft supports with a low sectional height
Features
- Machined type caged needle roller bearing without inner ring, inch series, seals on both sides (BR, UU), 11 sizes
- Shaft 15.875 to 76.2 mm (5/8 to 3 in), outside diameter 28.575 to 95.25 mm (1 1/8 to 3 3/4 in)
- No inner ring: the shaft is the raceway, so a compact design is possible
- Seals on both sides (UU), special synthetic rubber, supplied prepacked with grease
- Basic dynamic load ratings 18.3 to 105 kN, static 20 to 211 kN
- Allowable rotational speed 2,500 to 12,000 rpm (grease lubrication)
Key specifications
| Specification | Detail |
|---|---|
| Brand | IKO (Nippon Thompson Co., Ltd., Japan) |
| Type | Machined type caged needle roller bearing without inner ring, inch series, seals on both sides (BR, UU) |
| Series | BR UU |
| Models | BR101816UU to BR486028UU (11 sizes) |
| Roller set bore diameter Fw (shaft diameter) | 15.875 to 76.2 mm (5/8 to 3 in) |
| Outside diameter D | 28.575 to 95.25 mm (1 1/8 to 3 3/4 in) |
| Outer ring width C | 25.4 to 44.45 mm |
| Seals | Both sides (UU), special synthetic rubber |
| Inner ring | None: the shaft is the raceway |
| Oil hole | One in the outer ring, with an oil groove |
| Grease | Prepacked |
| Basic dynamic load rating C | 18.3 to 105 kN |
| Basic static load rating C0 | 20 to 211 kN |
| Allowable rotational speed | 2,500 to 12,000 rpm (grease lubrication) |
Available sizes
| Model | Fw mm (in) | D mm (in) | C mm (in) | C (kN) | C0 (kN) | Speed (rpm) |
|---|---|---|---|---|---|---|
| BR101816UU | 15.875 (5/8) | 28.575 (1 1/8) | 25.4 (1) | 18.3 | 20 | 12,000 |
| BR162416UU | 25.4 (1) | 38.1 (1 1/2) | 25.4 (1) | 23.6 | 31.3 | 8,000 |
| BR182620UU | 28.575 (1 1/8) | 41.275 (1 5/8) | 31.75 (1 1/4) | 34.9 | 49.9 | 7,000 |
| BR202820UU | 31.75 (1 1/4) | 44.45 (1 3/4) | 31.75 (1 1/4) | 36 | 53.5 | 6,500 |
| BR223020UU | 34.925 (1 3/8) | 47.625 (1 7/8) | 31.75 (1 1/4) | 38.5 | 60 | 5,500 |
| BR243320UU | 38.1 (1 1/2) | 52.388 (2 1/16) | 31.75 (1 1/4) | 43.7 | 66.9 | 5,500 |
| BR303920UU | 47.625 (1 7/8) | 61.912 (2 7/16) | 31.75 (1 1/4) | 48.5 | 82.1 | 4,000 |
| BR324120UU | 50.8 (2) | 65.088 (2 9/16) | 31.75 (1 1/4) | 51 | 89.4 | 4,000 |
| BR364828UU | 57.15 (2 1/4) | 76.2 (3) | 44.45 (1 3/4) | 90.3 | 158 | 3,500 |
| BR445628UU | 69.85 (2 3/4) | 88.9 (3 1/2) | 44.45 (1 3/4) | 98.7 | 189 | 2,500 |
| BR486028UU | 76.2 (3) | 95.25 (3 3/4) | 44.45 (1 3/4) | 105 | 211 | 2,500 |
Fw is the roller set bore diameter, D the outside diameter and C the width; C and C0 are the basic dynamic and static load ratings, and speed is the allowable rotational speed for grease lubrication.
Selecting the right option
Choose the size with the Outside Diameter option (in inches); the sizes table gives the shaft diameter, outside diameter and width in both millimetres and inches, so check the model number against the table.
The UU in the model number means seals on both sides. The open version of the series has no UU and is on the BR page.
LRBZ inner rings are the ring type for the BR series.
Fitting and use
These bearings are supplied prepacked with grease. The allowable rotational speed in the tables applies to grease lubrication. The outer ring has one oil hole with an oil groove.
The shaft is the raceway, so it needs to be heat-treated and ground.
Related products
Parts that go with this range: BR: the open BR series.
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IKO BR UU Needle Roller Bearings without Inner Ring, Seals Both Sides, 15.875 to 76.2 mm Shaft (Inch Series): 2 1/16 in
SKU: A0155260 | Model: BR243320UU/IKO
IKO BR243320UU inch series needle roller bearing without inner ring, seals on both sides, 38.1 x 52.388 x 31.75 mm.
