About Plain Bearings
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Selecting Compatible Lead Screws and Nuts
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Oil-Embedded Sleeve Bearings
Startup friction causes these porous bronze bearings to release a thin layer of oil on the bearing’s surface. They are also known as Oilite® bearings.
Note: Dynamic load capacity is the maximum load a bearing can withstand at a given shaft speed. If your application’s load and speed requirements are below the values listed, the bearing will work.
For technical drawings and 3-D models, click on a part number.
| For Housing ID | Lg. | Dynamic Radial Load Capacity | Lubrication | Lubricant | Temperature Range, °F | Each | |
For 7/8" Shaft Dia. | |||||||
|---|---|---|---|---|---|---|---|
| 1 1/8" | 2 3/4" | 4,800 lbs. @ 60 rpm | Lubricated | SAE 30 Oil | 10° to 175° | 00000000 | 000000 |
For 1 1/2" Shaft Dia. | |||||||
| 1 7/8" | 2 3/4" | 8,250 lbs. @ 30 rpm | Lubricated | SAE 30 Oil | 10° to 175° | 0000000 | 00000 |
For 1 3/4" Shaft Dia. | |||||||
| 2" | 2 3/4" | 9,600 lbs. @ 30 rpm | Lubricated | SAE 30 Oil | 10° to 175° | 0000000 | 00000 |
For 2" Shaft Dia. | |||||||
| 2 3/8" | 2 3/4" | 11,000 lbs. @ 30 rpm | Lubricated | SAE 30 Oil | -35° to 300° | 00000000 | 00000 |
For 2 3/4" Shaft Dia. | |||||||
| 3 1/8" | 2 3/4" | 15,100 lbs. @ 30 rpm | Lubricated | SAE 30 Oil | 10° to 175° | 00000000 | 00000 |
Color-Coded Horseshoe Shims
These shims are color-coded by thickness for easy identification. The horseshoe design fits around screws. Use them to align cabinets, doors, and windows. Shims are made of plastic to resist moisture and prevent rot.
For technical drawings and 3-D models, click on a part number.
Slot | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Lg. | Wd. | Wd. | Dp. | For Max. Screw Size  | Material | Temperature Range | Pkg. Qty. | Pkg. | |
0.063" Thick. (-0.032" to 0.032" Tolerance)—Blue | |||||||||
| 2 3/4" | 2" | 5/8" | 2 1/16" | 9/16" | Polypropylene Plastic | Not Rated | 100 | 0000000 | 000000 |
1/8" Thick. (-0.032" to 0.032" Tolerance)—Red | |||||||||
| 2 3/4" | 2" | 5/8" | 2 1/16" | 9/16" | Polypropylene Plastic | Not Rated | 100 | 0000000 | 00000 |
1/4" Thick. (-0.032" to 0.032" Tolerance)—Black | |||||||||
| 2 3/4" | 2" | 5/8" | 2 1/16" | 9/16" | Polypropylene Plastic | Not Rated | 50 | 0000000 | 00000 |
Horseshoe Shims
Align cabinets, doors, and windows with these shims. The horseshoe design fits around screws. Shims are made of stainless steel to resist corrosion.
For technical drawings and 3-D models, click on a part number.
Slot | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Lg. | Wd. | Wd. | Dp. | For Max. Screw Size | Material | Minimum Hardness | Magnetic Properties | Each | |
0.063" Thick. (-0.01" to 0.01" Tolerance) | |||||||||
| 2 3/4" | 2" | 5/8" | 2" | 5/8" | 316 Stainless Steel | Rockwell B83 | May Be Mildly Magnetic | 0000000 | 00000 |
1/8" Thick. (-0.01" to 0.01" Tolerance) | |||||||||
| 2 3/4" | 2" | 5/8" | 2" | 5/8" | 316 Stainless Steel | Rockwell B83 | May Be Mildly Magnetic | 0000000 | 0000 |
1/4" Thick. (-0.01" to 0.01" Tolerance) | |||||||||
| 2 3/4" | 2" | 5/8" | 2" | 5/8" | 316 Stainless Steel | Rockwell B83 | May Be Mildly Magnetic | 0000000 | 00000 |
Precision Acme Lead Screws and Nuts
Pair with a motor in automated motion and positioning applications. A tight thread fit allows these lead screws and nuts to make accurate, repeatable starts and stops. Also known as single-start and self-locking lead screws and nuts, they have a single thread that runs the length of the screw. The nut travels only when the screw turns, so your system won’t unexpectedly move when the lead screw is at rest. To ensure compatibility, please select components that have the same thread direction, thread size, and number of thread starts.
Carbon steel lead screws and flanges have good machinability. 303 and 304 stainless steel lead screws and flanges have good corrosion resistance.
932 bearing bronze and 673 bronze nuts are wear resistant. They have good machinability and fair corrosion resistance.
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.
Combine externally threaded nuts with a flange to create a custom flange nut.
External Thread | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Lg. | Dia. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Size | Lg. | Thread Fit | Hardness | Dynamic Thrust Load Cap., lbs. | Each | |
673 Bronze | ||||||||||||
| 2"-4 | 2 3/4" | 2.75" | 1 | 1:1 | 0.25" | 2 35/64"-18 | 7/8" | Class 2C | Brinell 70 | Not Rated | 000000000 | 0000000 |
| 2"-5 | 2 3/4" | 2.75" | 1 | 1:1 | 0.2" | 2 35/64"-18 | 7/8" | Class 2C | Brinell 70 | Not Rated | 000000000 | 000000 |
Combine externally threaded nuts with a flange to create a custom flange nut.
External Thread | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Lg. | Dia. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Size | Lg. | Thread Fit | Hardness | Dynamic Thrust Load Cap., lbs. | Each | |
673 Bronze | ||||||||||||
| 2"-4 | 2 3/4" | 2.75" | 1 | 1:1 | 0.25" | 2 35/64"-18 | 7/8" | Class 2C | Brinell 70 | Not Rated | 000000000 | 0000000 |
Thread onto an externally threaded acme nut to create a custom flange nut.
Carbon steel flanges have good machinability. However, they will rust when exposed to moisture. Black-oxide carbon steel flanges have mild corrosion resistance in dry environments and a dark surface color. 303 stainless steel flanges have good corrosion resistance.
Ball Screws and Nuts
Internal ball bearings provide smooth low-friction travel in applications that require high speeds, accurate positioning, and repeatable movement. Also known as single-start ball screws and nuts, they have a single thread that runs the length of the screw. They operate with more torque than fast-travel ball screws and nuts. To ensure compatibility, select components that have the same thread direction and size. Ball nuts are furnished with a tube to keep ball bearings in place. Do not remove the tube until you are ready to install the nuts onto the screws.
Black-oxide alloy steel ball screws and nuts have mild corrosion resistance.
Travel distance per turn, also known as screw lead, is the distance a ball nut moves with one revolution of the ball screw.
For technical drawings and 3-D models, click on a part number.
Secure a way wiper on the end of a ball nut to sweep chips and other contaminants out of the way as it moves across the ball screw.
T-Slotted Framing Linear Bearings and Track Rollers
Mount components to these load-rated bearings and track rollers to add linear motion along T-slotted rails.
For technical drawings and 3-D models, click on a part number.
Bearings move more accurately than other T-slotted framing linear motion components, such as track rollers, and are often used in automated systems and other applications requiring repetitive motion. They’re lined with slippery, durable plastic and have no moving parts. These bearings withstand exposure to dirt, water, impact, and vibration. To adjust how they fit on your rail, slide one of the included shims between the bearing pad and bearing housing.
Flanged sleeve bearings mount in two different orientations: one where the bearing slides along the rail and another where the bearing acts as a mount allowing the rail to slide. Fasten bolts through the flange holes to secure them to rails, loads, and other surfaces.
Heavy duty flanged bearings have threaded inserts in their bearing pads for a tighter grip on the bearing housing. They work well in pick-and-place, parts-transfer, and other high-speed applications with frequent starts, stops, and changes in speed.
Bearing pads replace worn pads.
Linear Bearings | Replacement Bearing Pads | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| For Rail Ht. | Dynamic Load Capacity | Static Load Capacity, lbs. | Lg. | (A) | (B) | (C) | Includes | Each | Each | ||
Standard Strength—1 Flange | |||||||||||
Silver Anodized Aluminum | |||||||||||
| 1 1/2" | 18 lbs. @ 100 fpm | 215 | 2 13/16" | 2 1/2" | 2 3/4" | 2" | One Carriage Panel, Three Bearing Pads, 10 Shims | 000000000 | 000000 | 000000000 | 00000 |
| 1 1/2" | 36 lbs. @ 100 fpm | 430 | 6" | 2 1/2" | 2 3/4" | 2" | One Carriage Panel, Six Bearing Pads, 20 Shims | 000000000 | 000000 | 000000000 | 0000 |
Black Anodized Aluminum | |||||||||||
| 1 1/2" | 18 lbs. @ 100 fpm | 215 | 2 13/16" | 2 1/2" | 2 3/4" | 2" | One Carriage Panel, Three Bearing Pads, 10 Shims | 0000000 | 000000 | 00000000 | 0000 |
| 1 1/2" | 36 lbs. @ 100 fpm | 430 | 6" | 2 1/2" | 2 3/4" | 2" | One Carriage Panel, Six Bearing Pads, 20 Shims | 00000000 | 000000 | 00000000 | 0000 |
Heavy Duty Strength—1 Flange | |||||||||||
Silver Anodized Aluminum | |||||||||||
| 1 1/2" | 18 lbs. @ 100 fpm | 215 | 2 13/16" | 2 1/2" | 2 3/4" | 2" | One Carriage Panel, Three Bearing Pads, 10 Shims | 000000000 | 000000 | 000000000 | 0000 |
| 1 1/2" | 36 lbs. @ 100 fpm | 430 | 6" | 2 1/2" | 2 3/4" | 2" | One Carriage Panel, Six Bearing Pads, 20 Shims | 000000000 | 000000 | 000000000 | 0000 |
Hand brakes hold sleeve bearing carriages in place on the rail. Single arm brakes have an adjustable grip. If space is tight, you can ratchet the grip out of the way without releasing the brake.
For Rail Ht. | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Single | Double | Triple | Lg. | Wd. | Dia. | Projection | Material | Color | Each | |
Single Arm Grip Style | ||||||||||
| 1 1/2" | 3" | 4 1/2" | 3 1/2" | 7/8" | __ | 2 1/4" | Zinc | Silver | 00000000 | 000000 |
| 1 1/2" | 3" | 4 1/2" | 3 1/2" | 7/8" | __ | 2 1/4" | Zinc | Yellow | 00000000 | 00000 |
Two Arm Grip Style | ||||||||||
| 1 1/2" | 3" | 4 1/2" | 2 1/2" | 3/4" | __ | 1 1/8" | Plastic | Black | 00000000 | 0000 |
Eight Arm Grip Style | ||||||||||
| 1 1/2" | 3" | 4 1/2" | __ | __ | 1 3/8" | 7/8" | Plastic | Black | 00000000 | 0000 |
For Rail Ht. | Slot | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Single | Double | Triple | Lg. | Wd. | Thickness | Lg. | Wd. | Includes | Material | Color | Each | |
| 1 | 3", 80mm | 4 1/2" | 2 13/16" | 1 1/4" | 0.005" | 2 3/16" | 1/4" | 20 Shims | Polyethylene Plastic | White | 00000000 | 00000 |
Bearing Separators
Separate bearings, collars, hubs, and other shaft-mounted items so you can remove them. After separation, use a puller (not included) to remove them from the shaft.
Separators can be used with Face-Grip Pullers. Select a face-grip puller with a leg thread size that matches the thread size of your separator.
Thread | |||||
|---|---|---|---|---|---|
| Spreader Opening | Size | Lg. | Wd. | Each | |
Steel Separators | |||||
| 1/8"-1 7/8" | 3/8"-16 | 2 3/4" | 3 1/2" | 000000 | 000000 |