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NTN R4ZZ is an extra small single-row deep groove ball bearing with a 1/4 in straight bore and double shielded (steel) design. Suitable for light-duty applications requiring low friction and minimal maintenance.
MODEL R4ZZ
$73.10 Each
Prices are subject to change
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Returnable:No
B (in)
0.1960
Ball Material
Steel
Ball material
Steel
Bore Type
Round
Bore type
Round
Cage Material
Steel
Cage material
Steel
Cage Type
Stainless
Cage type
Stainless
Configuration
One
d (in)
0.2500
D (in)
0.6250
Dynamic Load Rating
335 lbf
Dynamic load rating
335 lbf
Enclosure
Double Shielded
Factor
13.6
I.D.
6.35 mm
Limiting Speed - Grease
36000 RPM
Limiting speed - grease
36000 RPM
Material
High carbon chrome
O.D.
15.875 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
Class 0
r (in)
0.0120
Radial Internal Clearance
CN
Radial internal clearance
CN
Seal material
None
Seal type
None
Static Load Rating
138 lbf
Static load rating
138 lbf
Type
Miniature / Extra Small Ball Bearing
Technical Specifications
Type | Miniature / Extra Small Ball Bearing |
Bore Type | Round |
Material | High Carbon Chrome |
Cage Type | Stainless |
Cage Material | Steel |
Ball Material | Steel |
Limiting Speed - Grease | 36000 RPM |
Seal Type | None |
Seal Material | None |
Precision | Class 0 |
Configuration | One |
Factor | 13.6 |
Radial Internal Clearance | CN |
Static Load Rating | 138 lbf615 N0.62 kN |
Dynamic Load Rating | 335 lbf1480 N1.48 kN |
Enclosure | Double Shielded |
Weight | 0.009 lb0.004 kg |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
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.
#1495408
Brand
Koyo Bearing
Model
EE11/2 ZZ
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