About Ball and Roller Bearings
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Precision Ball Bearings
For greater accuracy and higher speeds, these bearings are made to tighter tolerances than standard ball bearings.
Shielded bearings dissipate heat more efficiently than sealed bearings.
Sealed bearings block out dust and other contaminants better than shielded bearings.
For technical drawings and 3-D models, click on a part number.
Radial Load Cap., lbs. | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Bearing Trade Number | For Shaft Dia., mm | For Housing ID, mm | Wd., mm | Ring Material | Dynamic | Static | Max. Speed, rpm | Lubrication | Temp. Range, °F | ABEC Rating | Each | |
Shielded | ||||||||||||
6218-2Z | 90 | 160 | 30 | Steel | 22,700 | 16,500 | 4,300 | Lubricated | -20° to 230° | ABEC-3 | 0000000 | 0000000 |
Sealed | ||||||||||||
6218-2RS | 90 | 160 | 30 | Steel | 22,700 | 16,500 | 2,600 | Lubricated | -30° to 210° | ABEC-3 | 0000000 | 000000 |
Combination Ball/Needle-Roller Bearings
A built-in thrust ball bearing reduces wear from adjacent shaft components, while the needle rollers support high radial loads. Install anywhere you would use separate bearings for radial and thrust loads.
For technical drawings and 3-D models, click on a part number.
Radial Load Cap., lbs. | Thrust Load Cap., lbs. | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Shaft Dia., mm | For Housing ID, mm | Wd., mm | Ball Bearing OD, mm | Ball Bearing Wd., mm | Ring Material | Dynamic | Static | Dynamic | Static | Max. Speed, rpm | Lubrication | For Shaft Surface Smoothness (Ra), microinch | Temp. Range, °F | Each | |
Open | |||||||||||||||
20 | 30 | 30 | 36 | 10 | Steel | 3,300 | 5,300 | 3,190 | 4,420 | 7,000 | Required | 8 | -20° to 230° | 00000000 | 0000000 |
25 | 37 | 30 | 43 | 11 | Steel | 4,250 | 6,700 | 4,050 | 6,670 | 6,300 | Required | 8 | -20° to 230° | 00000000 | 000000 |
30 | 42 | 30 | 48 | 11 | Steel | 4,550 | 7,750 | 4,200 | 7,550 | 5,600 | Required | 8 | -20° to 230° | 00000000 | 000000 |
35 | 47 | 30 | 53 | 12 | Steel | 4,950 | 9,150 | 4,500 | 8,450 | 5,300 | Required | 8 | -20° to 230° | 00000000 | 000000 |
Needle-Roller Bearings
Also known as drawn-cup roller bearings, these are our thinnest roller bearings. The outer ring is drawn out to form a lip that holds the bearing together. Bearings take on the shape of their housing and may be oblong prior to installation.
Open bearings dissipate heat more efficiently than sealed bearings.
Sealed bearings block out dust better than open bearings, but retain more heat.
For technical drawings and 3-D models, click on a part number.
Radial Load Cap., lbs. | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
For Shaft Dia. | For Housing ID | Wd. | Ring Material | Dynamic | Static | Max. Speed, rpm | Lubrication | For Shaft Surface Smoothness (Ra), microinch | Temp. Range, °F | Specifications Met | Each | |
Open | ||||||||||||
20mm | 26mm | 30mm | Steel | 4,900 | 8,950 | 12,700 | Required | 8 | -20° to 280° | DIN 618, ISO 3245 | 00000000 | 000000 |
Sealed—Both Sides | ||||||||||||
25mm | 32mm | 30mm | Steel | 5,700 | 10,100 | 6,100 | Lubricated | 8 | 0° to 210° | DIN 618 | 00000000 | 00000 |
One-Way Locking Needle-Roller Bearing Clutches
The needles in these bearings roll freely in one direction, but lock to transmit torque when the rotation of the shaft is reversed. Also known as drawn-cup roller clutches. An arrow on the lip indicates the rotational direction that locks the bearings.
Triple-row bearings support radial loads.
Bearings with 301 stainless steel springs handle higher temperatures than bearings with acetal springs.
For technical drawings and 3-D models, click on a part number.
Radial Load Cap., lbs. | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
For Shaft Dia. | For Housing ID | Wd. | Ring Material | Dynamic | Static | Max. Speed, rpm | Max. Torque, ft.-lbs. | Lubrication | For Shaft Surface Smoothness (Ra), microinch | Temp. Range, °F | Each | |
Triple Row | ||||||||||||
301 Stainless Steel Springs | ||||||||||||
25mm | 32mm | 30mm | Steel | 2,500 | 2,900 | 8,700 | 50 | Required | 16 | -20° to 250° | 0000000 | 000000 |
30mm | 37mm | 30mm | Steel | 2,550 | 3,350 | 7,300 | 70 | Required | 16 | -20° to 250° | 0000000 | 00000 |