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NTN R6LLUC3/EM is an extra-small single-row deep groove ball bearing with a 3/8" straight bore. It features double contact rubber seals, C3 internal clearance, and a machined brass cage. Designed for high-speed and light-load applications in precision instruments, power tools, and small electric motors.
MODEL R6LLUC3/EM
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$30.25 Each
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Brand Minimum Order Quantity: 3
Typically Ships in: 1 day
Returnable:No
B (in)
0.2812
Ball Material
Steel
Ball material
Steel
Bore Type
Round
Bore type
Round
Cage Material
Stainless
Cage material
Stainless
Cage Type
Stainless
Cage type
Stainless
Configuration
One
D (in)
0.8750
d (in)
0.3750
Dynamic Load Rating
740 lbf
Dynamic load rating
740 lbf
Enclosure
Double Sealed
Factor
12.7
I.D.
9.525 mm
Limiting Speed - Grease
23250 RPM
Limiting speed - grease
23250 RPM
Limiting Speed - Oil
27750 RPM
Limiting speed - oil
27750 RPM
Material
High carbon chrome
O.D.
22.225 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO class 0
r (in)
0.0160
Radial Internal Clearance
C3
Radial internal clearance
C3
Seal Material
Nitrile Rubber
Seal material
Nitrile rubber
Seal Type
Contact
Seal type
Contact
Static Load Rating
315 lbf
Static load rating
315 lbf
Type
Miniature / Extra Small Ball Bearing
Specifications
| Bearing Data Sheet | ||
|---|---|---|
| Micro Ball Bearings | ||
| NTN Part Number | R6LLU | |
| Weight | N/A (lbs) / N/A (kg) | |
| Dimensions | Features/Options | ||||
|---|---|---|---|---|---|
| Dimension | Imperial | Metric | Option | Code | Description |
|
Bore d O.D.D. Width B or W B1 C3 C4 D1 D2 C1 C2 rs min da min Da max ras max |
0.3750 (in) 0.8750 (in) 0.0000 (in) 0.2812 (in) 0.9689 (in) 0.0618 (in) 0.0161 (in) 0.4528 (in) 0.7953 (in) 0.0157 (in) |
9.525 (mm) 22.225 (mm) 0.000 (mm) 7.142 (mm) 24.610 (mm) 1.570 (mm) 0.410 (mm) 11.500 (mm) 20.200 (mm) 0.400 (mm) |
Cage Seal/Shield Internal Clr. Tolerance |
LLU |
Pressed steel cage Contact type rubber sea Normal clearance ISO class 0 |
| Basic Load Ratings | Limiting Speeds | ||||
|---|---|---|---|---|---|
| Static Dynamic |
315 (LBF) 745 (LBF) |
1,400 (N) 3,300 (N) |
Oil Seals Grease |
37,000.00 (RPM) N/A 31,000.00 (RPM) |
|
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.
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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