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NTN 6304Z/2AS is a 63 series single-row deep groove ball bearing with a 20 mm straight bore. It features a single metal shield (Z) on one side and is pre-greased with NTN factory grease (/2AS). Designed for radial loads in electric motors, pumps, fans, and general rotating machinery.
MODEL 6304Z/2AS
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$27.88 Each
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Brand Minimum Order Quantity: 3
Typically Ships in: 1 day
Returnable: See conditions
B (in)
0.5906
Ball material
Steel
Ball Material
Steel
Bore type
Round
Bore Type
Round
Cage material
Steel
Cage Material
Steel
Cage type
Pressed
Cage Type
Pressed
Configuration
One
D (in)
2.0472
d (in)
0.7874
da max
1.1220 in
Da max
1.7913 in
da min
1.0433 in
Dynamic load rating
3950 lbf
Dynamic Load Rating
3950 lbf
Enclosure
Single Shielded
Factor
45.5
I.D.
20 mm
Limiting speed - grease
14000 RPM
Limiting Speed - Grease
14000 RPM
Limiting speed - oil
17000 RPM
Limiting Speed - Oil
17000 RPM
Material
High Carbon Chrome Steel
O.D.
52 mm
Operating temperature range
-40 to 250 ºF
Operating Temperature Range
-40 to 250 °F
Precision
ISO Class 0
r (in)
0.0433
r1
0.0197 in
Radial internal clearance
CN
Radial Internal Clearance
CN
ras max
0.0394 in
Static load rating
1780 lbf
Static Load Rating
1780 lbf
Type
Deep Groove Ball Bearing
Technical Specifications
Type | Deep Groove Ball Bearing |
Bore Type | Round |
Material | High Carbon Chrome Steel |
Cage Type | Pressed |
Cage Material | Steel |
Ball Material | Steel |
Limiting Speed - Oil | 17000 RPM |
Limiting Speed - Grease | 14000 RPM |
Precision | ISO Class 0 |
Configuration | One |
Factor | 45.5 |
Radial Internal Clearance | CN |
Static Load Rating | 1780 lbf7900 N7.90 kN |
Dynamic Load Rating | 3550 lbf15900 N15.90 kN |
Enclosure | Single Shielded |
Weight | 0.313 lb0.142 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.
