Selecting Compatible Lead Screws and Nuts
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About Shaft Collars
Shaft collars are useful for holding and positioning components on a shaft. They can also serve as mechanical stops and stroke limiters.
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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.
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.
| Thread Size  | Lg., mm | Wd., mm | Ht., mm | Center Ht., mm | No. of Thread Starts | Travel Distance per Turn, mm | Hardness | Dynamic Thrust Load Cap., lbs. | Max. Backlash, mm | Temp. Range, °F | Each | |
Alloy Steel | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M14 | 35 | 34 | 30 | 13 | 1 | 4 | Rockwell C58 | 1,200 | 0.1 | 5° to 175° | 0000000 | 0000000 |
Bearing Retaining Nuts
Often paired with spring lock washers to strengthen their hold, these retaining nuts—also known as shaft nuts—keep vibration from shifting bearings, bushings, pulleys, and gears on your threaded shaft or spindle. They have slotted sides, so you can tighten and loosen them with a spanner wrench or spanner socket.
Chamfered-face retaining nuts weigh less and produce less heat than stepped-face nuts. Some meet ISO 2982 (formerly DIN 981), an international standard for bearing locknut dimensions. Their sizes correspond to SKF KM series. Use them with DIN 5406 spring lock washers.
Carbon steel retaining nuts are strong and resist wear.
For technical drawings and 3-D models, click on a part number.
Thread | ||||||||
|---|---|---|---|---|---|---|---|---|
| Size | Pitch, mm | Spacing | OD | Wd., mm | Specifications Met | For Lock Washer Specifications Met | Each | |
Carbon Steel | ||||||||
Chamfered Face | ||||||||
| M240 | 4 | Extra Fine | 300mm | 34 | DIN 981, ISO 2982 | DIN 5406 | 0000000 | 0000000 |
Multi-Slotted Shims
Use a single shim on feet or positioning arms that are secured with multiple fasteners. The slots let you insert, remove, and adjust the shims without disassembling your machinery. Shims are made of steel for good strength. Also known as finger shims.
Metric shims meet standards set by NAAMS (North American Automotive Metric Standards) for assembly components commonly used in production and automation setups.
For technical drawings and 3-D models, click on a part number.
Slot | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thick. | Thick. Tolerance | Lg. | Wd. | Wd. | Dp. | Shim Trade Size | For Max. Screw Size | Material | Min. Hardness | Magnetic Properties | Pkg. Qty. | Pkg. | |
Metric | |||||||||||||
Two Slots | |||||||||||||
| 0.25mm | -0.03mm to 0.03mm | 25mm | 34mm | 10.5mm | 17.8mm | ASH202 | M10 | 1008-1010 Carbon Steel | Not Rated | Magnetic | 10 | 0000000 | 000000 |
| 0.5mm | -0.03mm to 0.03mm | 25mm | 34mm | 10.5mm | 17.8mm | ASH205 | M10 | Chromate Conversion-Coated 1008-1010 Carbon Steel | Not Rated | Magnetic | 10 | 0000000 | 00000 |
| 1mm | -0.03mm to 0.03mm | 25mm | 34mm | 10.5mm | 17.8mm | ASH210 | M10 | Black-Oxide 1008-1010 Carbon Steel | Not Rated | Magnetic | 10 | 0000000 | 00000 |
| 2mm | -0.03mm to 0.03mm | 25mm | 34mm | 10.5mm | 17.8mm | ASH220 | M10 | 1008-1010 Carbon Steel | Not Rated | Magnetic | 10 | 0000000 | 00000 |