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NTN BNT004/GNP2 is a single-row angular contact ball bearing with a 20 mm straight bore. Designed for high-precision applications such as machine tool spindles and lathes, it features P2 precision class for superior running accuracy. The open configuration allows for custom lubrication.
MODEL BNT004/GNP2
$731.70 Each
Prices are subject to change
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Returnable:No
a (in)
0.3937
B (in)
0.4724
Ball Material
Steel
Ball material
Steel
Bore Type
Round
Bore type
Round
Cage Material
Phenolic Resin
Cage material
Phenolic resin
Cage Type
Machined
Cage type
Machined
Configuration
One
Contact angle
15 º
D (in)
1.6535
d (in)
0.7874
D1
1.3976 in
d1
1.0787 in
d2
0.9803 in
Da max
1.4764 in
da min
0.9646 in
db min
0.8858 in
Double Row Width
0.9449 in
Dynamic Load Rating
1800 lbf
Dynamic load rating
1800 lbf
Enclosure
Open
Factor
9.2
I.D.
20 mm
Limiting Speed - Grease
34300 RPM
Limiting speed - grease
34300 RPM
Limiting Speed - Oil
68300 RPM
Limiting speed - oil
68300 RPM
Material
High carbon chrome steel
O.D.
42 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO class 2
Preload
Normal
Quadruple Row Width
1.8898 in
r (in)
0.0236
r1
0.0118 in
r1as max
0.0118 in
ras max
0.0236 in
Static Load Rating
890 lbf
Static load rating
890 lbf
Triple Row Width
1.4173 in
Type
Main Spindle Bearing
Technical Specifications
Type | Main Spindle Bearing |
|---|---|
Bore Type | Round |
Material | High Carbon Chrome Steel |
Cage Type | Machined |
Cage Material | Phenolic Resin |
Ball Material | Steel |
Limiting Speed - Oil | 68300 RPM |
Limiting Speed - Grease | 34300 RPM |
Precision | ISO Class 2 |
Configuration | One |
Preload | Normal |
Factor | 9.2 |
Static Load Rating | 890 lbf3950 N3.95 kN |
Dynamic Load Rating | 1800 lbf8000 N8.00 kN |
Enclosure | Open |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 0.7874 in20.000 mm |
|---|---|
D | 1.6535 in42.000 mm |
B | 0.4724 in12.000 mm |
d1 | 1.0787 in27.400 mm |
d2 | 0.9803 in24.900 mm |
D1 | 1.3976 in35.500 mm |
r | 0.0236 in0.600 mm |
r1 | 0.0118 in0.300 mm |
Contact Angle | 15 |
a | 0.3937 in10.000 mm |
da min | 0.9646 in24.500 mm |
db min | 0.8858 in22.500 mm |
Da max | 1.4764 in37.500 mm |
ras max | 0.0236 in0.600 mm |
r1as max | 0.0118 in0.300 mm |
Double Row Width | 0.9449 in24.000 mm |
Triple Row Width | 1.4173 in36.000 mm |
Quadruple Row Width | 1.8898 in48.000 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.
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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