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NTN HTA012DB/GNP4L is a duplex angular contact ball bearing with a 60 mm straight bore. Designed for axial loads in high-speed machine tool spindles, it features P4 precision class and a GNP4L preload specification. The bearing is open (unsealed) and suitable for oil lubrication.
MODEL HTA012DB/GNP4L
$2,377.32 Each
Prices are subject to change
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Returnable:No
2a
3.2244 in
2B
1.2992 in
B (in)
0.6496
Ball Material
Steel
Ball material
Steel
Bore Type
Round
Bore type
Round
Cage Material
Phenolic
Cage material
Phenolic
Cage Type
Machined
Cage type
Machined
Configuration
Two
Contact angle
40 º
D (in)
3.7402
d (in)
2.3622
d1
2.8819 in
D2
3.378 in
da min
2.7559 in
Db max
3.5039 in
Dynamic Load Rating
7550 lbf
Dynamic load rating
7550 lbf
Enclosure
Open
I.D.
60 mm
Limiting Speed - Grease
9700 RPM
Limiting speed - grease
9700 RPM
Limiting Speed - Oil
12300 RPM
Limiting speed - oil
12300 RPM
Material
High carbon chrome steel
O.D.
95 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO class 4
Preload
Normal
r (in)
0.0433
r1
0.0236 in
r1as max
0.0236 in
ras max
0.0394 in
Static Load Rating
15600 lbf
Static load rating
15600 lbf
Type
Main Spindle Bearing
Technical Specifications
Type | Main Spindle Bearing |
Bore Type | Round |
Material | High Carbon Chrome Steel |
Cage Type | Machined |
Cage Material | Phenolic |
Ball Material | Steel |
Limiting Speed - Oil | 12300 RPM |
Limiting Speed - Grease | 9700 RPM |
Precision | ISO Class 4 |
Configuration | Two |
Preload | Normal |
Static Load Rating | 15600 lbf69500 N69.50 kN |
Dynamic Load Rating | 7550 lbf33500 N33.50 kN |
Enclosure | Open |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 2.3622 in60.000 mm |
D | 3.7402 in95.000 mm |
B | 0.6496 in16.500 mm |
2B | 1.2992 in33.000 mm |
d1 | 2.8819 in73.200 mm |
D2 | 3.378 in85.800 mm |
r | 0.0433 in1.100 mm |
r1 | 0.0236 in0.600 mm |
Contact Angle | 40 |
2a | 3.2244 in81.900 mm |
da min | 2.7559 in70.000 mm |
Db max | 3.5039 in89.000 mm |
ras max | 0.0394 in1.000 mm |
r1as max | 0.0236 in0.600 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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