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NTN TMB208NR is a single-row deep groove ball bearing with a 40 mm bore. It features an open design with a snap ring groove for axial location in the housing. Suitable for general industrial applications requiring simple radial load support.
MODEL TMB208NR
$76.33 Each
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a (in)
0.1291
B (in)
0.7087
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)
3.1496
d (in)
1.5748
D1
3.0240 in
D2
3.4094 in
Da max
2.8937 in
da max
2.0079 in
da min
1.8307 in
Dynamic load rating
6550 lbf
Dynamic Load Rating
6550 lbf
Enclosure
Open
f (in)
0.0669
Factor
14.0
I.D.
40 mm
Limiting speed - grease
8700 RPM
Limiting Speed - Grease
8700 RPM
Limiting speed - oil
10000 RPM
Limiting Speed - Oil
10000 RPM
Material
High Carbon Chrome Steel
O.D.
80 mm
Operating temperature range
-40 to 250 ºF
Operating Temperature Range
-40 to 250 °F
Precision
ISO Class 0
r (in)
0.0394
r1
0.0118 in
Radial internal clearance
CN
Radial Internal Clearance
CN
ras max
0.0394 in
Static load rating
4000 lbf
Static Load Rating
4000 lbf
Style
Long Life Thermal Mechanical Bearing
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 | 10000 RPM |
Limiting Speed - Grease | 8700 RPM |
Precision | ISO Class 0 |
Configuration | One |
Factor | 14.0 |
Radial Internal Clearance | CN |
Static Load Rating | 4000 lbf17800 N17.80 kN |
Dynamic Load Rating | 6550 lbf29100 N29.10 kN |
Enclosure | Open |
Weight | 0.825 lb0.374 kg |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 1.5748 in40.000 mm |
D | 3.1496 in80.000 mm |
B | 0.7087 in18.000 mm |
D1 | 3.0240 in76.810 mm |
D2 | 3.4094 in86.600 mm |
a | 0.1291 in3.280 mm |
f | 0.0669 in1.700 mm |
r | 0.0394 in1.000 mm |
r1 | 0.0118 in0.300 mm |
da min | 1.8307 in46.500 mm |
da max | 2.0079 in51.000 mm |
Da max | 2.8937 in73.500 mm |
ras max | 0.0394 in1.000 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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