Selecting Compatible Lead Screws and Nuts
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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.
Root diameter indicates the diameter the ball screw will be after machining away the threads.
| Thread Size  | Lg. | No. of Thread Starts | Travel Distance per Turn | Accuracy for Travel Distance per Turn | Root Dia. | Hardness | Tensile Strength, psi | Temp. Range, °F | Each | |
Carbon Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| M20 | 500 mm | 1 | 5mm | ±0.210 mm per 300 mm | 17.2mm | Rockwell C58 | 21,000 | 5° to 175° | 0000000 | 0000000 |
| M20 | 1,000 mm | 1 | 5mm | ±0.210 mm per 300 mm | 17.2mm | Rockwell C58 | 21,000 | 5° to 175° | 000000 | 000000 |
| M20 | 1,500 mm | 1 | 10mm | ±0.210 mm per 300 mm | 16.4mm | Rockwell C58 | 21,000 | 5° to 175° | 000000 | 000000 |
Fast-Travel Ball Screws and Nuts
Multiple thread channels (also known as thread starts) create faster linear travel than ball screws with a single thread start. Internal ball bearings provide smooth low-friction travel in applications that require high speeds, accurate positioning, and repeatable movement. To ensure compatibility, select components that have the same thread size and number of thread starts. 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.
Carbon steel ball screws and nuts are case hardened, so they resist wear better than standard carbon steel. However, they are less corrosion resistant than black-oxide alloy steel screws and nuts.
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.
Root diameter indicates the diameter the ball screw will be after machining away the threads.
| Thread Size | Lg. | No. of Thread Starts | Travel Distance per Turn | Accuracy for Travel Distance per Turn | Root Dia. | Hardness | Tensile Strength, psi | Temperature Range, °F | Each | |
Carbon Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| M20 | 500mm | 4 | 20mm | ±0.05 mm per 300 mm | 17mm | Rockwell C56 | 95,000 | 32° to 150° | 00000000 | 0000000 |
| M20 | 1,000mm | 4 | 20mm | ±0.05 mm per 300 mm | 17mm | Rockwell C56 | 95,000 | 32° to 150° | 00000000 | 000000 |
Flange | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Lg. | Dia. | Dia. | Thick. | No. of Thread Starts | Travel Distance per Turn | Bolt Circle Dia. | Hardness | Dynamic Thrust Load Cap., lbs. | Max. Backlash | Temperature Range, °F | Each | ||
Carbon Steel | ||||||||||||||
| E | M20 | 77mm | 35mm | 58mm | 10mm | 4 | 20mm | 47mm | Rockwell C56 | 2,750 | 0.04mm | 32° to 150° | 00000000 | 0000000 |
Roller Screws and Nuts
Precision ground to create more points of contact, these roller screws and nuts are highly accurate and handle much higher loads than ball screws and nuts of the same size. They're most traditionally used to replace hydraulics in linear actuators but can also be used in place of ball and lead screw assemblies because of their high load capacity and precise motion control. In fact, they're almost four times more accurate than our most accurate ball and lead screws. They also last longer than ball screw nuts in systems with lower loads and can handle higher shock loads. However, because they have more contact points, they’re slightly less efficient than ball screws. To ensure compatibility, select components that have the same thread direction and size.
Roller screws are made of hardened steel for strength and durability.
Travel distance per turn, also known as screw lead, is the distance a roller nut moves with one revolution of the roller screw.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Lg., mm | No. of Thread Starts | Travel Distance per Turn, mm | Accuracy for Travel Distance per Turn | Min. Thread Lg., mm | Root Dia., mm | Hardness | Tensile Strength, psi | Each | |
Alloy Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| M20 | 680 | 5 | 4 | ±0.023 mm per 300 mm | 561 | 19.15 | Rockwell C60 | 105,000 | 0000000 | 000000000 |
| M20 | 680 | 5 | 5 | ±0.023 mm per 300 mm | 561 | 19.05 | Rockwell C60 | 105,000 | 0000000 | 00000000 |
Keyway | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Lg., mm | Dia., mm | No. of Thread Starts | Travel Distance per Turn, mm | Wd., mm | Dp., mm | Hardness | Dynamic Thrust Load Cap., lbs. | Max. Backlash, mm | Temp. Range, °F | Lubrication | Each | |
Alloy Steel | |||||||||||||
| M20 | 65 | 42 | 5 | 4 | 4 | 18 | Rockwell C60 | 15,100 | 0.03 | -40° to 350° | Required | 0000000 | 000000000 |
| M20 | 65 | 42 | 5 | 5 | 4 | 18 | Rockwell C60 | 20,600 | 0.03 | -40° to 350° | Required | 0000000 | 00000000 |
Swiveling Tips for Screws and Threaded Studs
Attach to the end of a screw or threaded stud to apply uniform pressure on uneven and angled surfaces. Also known as toggle and swivel-foot pads.
For technical drawings and 3-D models, click on a part number.
| Dia. | Ht. | Load Capacity, lbs. | Thread Size | Range of Motion | Each | |
Steel | ||||||
|---|---|---|---|---|---|---|
| 32mm | 36mm | 4,720 | M20 | 20° | 0000000 | 000000 |