About Ball and Roller Bearings
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Selecting Compatible Lead Screws and Nuts
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Set Screw Collar Ball Bearings
Slip these bearings onto a shaft and secure with the included set screws, no special tools required. All have an extended inner ring for additional shaft support.
Bearings with a black-oxide steel ring have some corrosion resistance.
Sealed bearings block out dust and other contaminants better than shielded bearings.
Bearings with a retaining ring have a removable retaining ring that holds the bearing inside a housing.
For technical drawings and 3-D models, click on a part number.
Inner Ring | Retaining Ring | Radial Load Cap., lbs. | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Bearing Trade Number  | For Shaft Dia. | For Housing ID | Wd. | OD | Wd. | OD | Thick. | Dynamic | Static | Max. Speed, rpm | Temp. Range, °F | ABEC Rating | Each | |
Sealed (Lubricated) | ||||||||||||||
Black-Oxide Steel—With Retaining Ring | ||||||||||||||
| ER206 | 30mm | 62mm | 22.2mm | 40.5mm | 38.1mm | 67.5mm | 1.6mm | 4,350 | 2,550 | 5,450 | -20° to 220° | ABEC-1 | 0000000 | 0000000 |
Angular-Contact Thrust Ball Bearings
Install these bearings for use with combined radial and thrust loads. They are often used in spindle applications and can be combined with cylindrical roller bearings to better handle radial loads.
Double-row bearings handle thrust loads in both directions.
Open bearings dissipate heat more efficiently than shielded and sealed bearings.
Shielded bearings block out dust and other contaminants, but do not dissipate heat as efficiently as open bearings.
Sealed bearings block out dust and other contaminants better than open and shielded bearings, but retain the most heat.
For technical drawings and 3-D models, click on a part number.
Combined Load Cap., lbs. | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Bearing Trade Number | For Shaft Dia., mm | For Housing ID, mm | Wd., mm | Ring Material | Dynamic | Static | Max. Speed, rpm | Lubrication | Contact Angle | Temp. Range, °F | ABEC Rating | Each | |
Double Row | |||||||||||||
Open | |||||||||||||
| 3303 | 17 | 47 | 22.2 | Steel | 4,850 | 2,850 | 14,000 | Required | 30° | -20° to 230° | ABEC-1 | 00000000 | 000000 |
| 3304 | 20 | 52 | 22.2 | Steel | 5,300 | 3,250 | 13,000 | Required | 30° | -20° to 230° | ABEC-3 | 00000000 | 000000 |
Shielded | |||||||||||||
| 3303-2Z | 17 | 47 | 22.2 | Steel | 4,850 | 2,850 | 14,000 | Lubricated | 30° | -20° to 230° | ABEC-1 | 00000000 | 000000 |
| 3304-2Z | 20 | 52 | 22.2 | Steel | 5,300 | 2,250 | 13,000 | Lubricated | 30° | -20° to 230° | ABEC-3 | 00000000 | 000000 |
Sealed | |||||||||||||
| 3303-2RS | 17 | 47 | 22.2 | Steel | 4,850 | 2,850 | 11,000 | Lubricated | 30° | -20° to 230° | ABEC-1 | 00000000 | 000000 |
| 3304-2RS | 20 | 52 | 22.2 | Steel | 5,300 | 2,250 | 9,000 | Lubricated | 30° | -20° to 230° | ABEC-3 | 00000000 | 000000 |
Metric Lead Screws and Nuts
Found in hand-powered clamps, vises, grates, doors, and work tables, lead screws and nuts have broad, square threads that are well suited for quick assembly, high clamping forces, and lifting and lowering heavy objects. To ensure compatibility, please select components that have the same thread direction, size, and pitch. Class 7e and 7H components are compatible.
Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.
For technical drawings and 3-D models, click on a part number.
Hex nuts fasten and position lead screw components.
| Thread Size | Thread Pitch, mm | Ht., mm | Wd., mm | No. of Thread Starts | Speed Ratio | Travel Distance per Turn, mm | Thread Fit | Fastener Strength Grade/Class | Hardness | Each | |
Carbon Steel | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| M12 | 3 | 12 | 22.2 | 1 | 1:1 | 3 | 7H | Grade 2 | Not Rated | 000000000 | 000000 |