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NTN NN3028T2KC1NAP4 is a double-row cylindrical roller bearing with a 140 mm bore, open design, and polyamide cage. The NN type configuration has no flanges on the inner or outer ring, allowing axial expansion. It features C1 clearance and P4 precision class. Suitable for machine tool spindles and high-speed applications requiring high radial load capacity.
MODEL NN3028T2KC1NAP4
$1,362.91 Each
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B (in)
2.0866
Bore type
Tapered
Bore Type
Tapered
C (in)
2.0866
Cage material
Nylon
Cage Material
Nylon
Configuration
Two
d (in)
5.5118
D (in)
8.2677
Da max
7.6378 in
da min
5.8661 in
Db max
7.9134 in
Db min
7.6378 in
db min
6.0236 in
Dynamic load rating
67000 lbf
Dynamic Load Rating
67000 lbf
Enclosure
Open
Ew
7.5591 in
I.D.
140 mm
Limiting speed - grease
2800 RPM
Limiting Speed - Grease
2800 RPM
Limiting speed - oil
3300 RPM
Limiting Speed - Oil
3300 RPM
Material
Hardened Alloy Steel
O.D.
210 mm
Oil hole
w/o Oil Hole
Oil Hole
w/o Oil Hole
Operating temperature range
-40 to 250 ºF
Operating Temperature Range
-40 to 250 °F
Precision
ISO Class 4
r (in)
0.0787
Radial internal clearance
C1NA
Radial Internal Clearance
C1NA
ras max
0.0787 in
Static load rating
116000 lbf
Static Load Rating
116000 lbf
Taper
1:12
Type
Cylindrical Roller Bearing
Width
53 mm
Technical Specifications
Type | Cylindrical Roller Bearing |
Bore Type | Tapered |
Material | Hardened Alloy Steel |
Cage Material | Nylon |
Limiting Speed - Oil | 3300 RPM |
Limiting Speed - Grease | 2800 RPM |
Taper | 1:12 |
Precision | ISO Class 4 |
Configuration | Two |
Oil Hole | w/o Oil Hole |
Radial Internal Clearance | C1NA |
Static Load Rating | 116000 lbf515000 N515.00 kN |
Dynamic Load Rating | 67000 lbf298000 N298.00 kN |
Enclosure | Open |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 5.5118 in140.000 mm |
D | 8.2677 in210.000 mm |
B | 2.0866 in53.000 mm |
C | 2.0866 in53.000 mm |
Ew | 7.5591 in192.000 mm |
r | 0.0787 in2.000 mm |
da min | 5.8661 in149.000 mm |
db min | 6.0236 in153.000 mm |
Da max | 7.6378 in194.000 mm |
Db min | 7.6378 in194.000 mm |
Db max | 7.9134 in201.000 mm |
ras max | 0.0787 in2.000 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.
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