Selecting Compatible Lead Screws and Nuts
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Metric Precision 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, select components that have the same thread direction, size, pitch, and number of thread starts.
Lead screws are 1018 carbon steel for good machinability.
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.
| Thread Size  | Thread Pitch, mm | Lg., mm | No. of Thread Starts | Speed Ratio | Travel Distance per Turn, mm | Accuracy for Travel Distance per Turn | Thread Fit | Hardness | Tensile Strength, psi | Specifications Met | Each | |
1018 Carbon Steel | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M10 | 2 | 250 | 1 | 1:1 | 2 | ±0.15 mm per 300 mm | 8e | Brinell 150 | 85,000 | DIN 103 | 0000000 | 000000 |
Metric Fast-Travel Ultra-Precision Lead Screws and Nuts
Multiple thread channels (also known as thread starts) create faster linear travel than lead screws with a single thread start. Operating with less backlash (play) than Metric Precision Acme Lead Screws and Nuts, these lead screws and nuts provide increased nut life and more reliable movement in automated systems. To ensure compatibility, select components that have the same thread size, thread pitch, and number of thread starts. 303 and 304 stainless steel lead screws have good 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.
| Thread Size | Thread Pitch, mm | Lg., mm | No. of Thread Starts | Thread Type | Speed Ratio | Travel Distance per Turn, mm | Accuracy for Travel Distance per Turn | Hardness | Tensile Strength, psi | Each | |
304 Stainless Steel | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| M8 | 2.5 | 250 | 4 | Metric Rounded Trapezoidal | 4:1 | 10 | ±0.1 mm per 300 mm | Brinell 160 | 72,000 | 0000000 | 000000 |
| M10 | 3 | 250 | 4 | Metric Rounded Trapezoidal | 4:1 | 12 | ±0.1 mm per 300 mm | Brinell 160 | 72,000 | 0000000 | 00000 |
| M12 | 2.5 | 250 | 2 | Metric Rounded Trapezoidal | 2:1 | 5 | ±0.1 mm per 300 mm | Brinell 160 | 72,000 | 0000000 | 00000 |
| M16 | 5 | 250 | 7 | Metric Rounded Trapezoidal | 7:1 | 35 | ±0.1 mm per 300 mm | Brinell 160 | 72,000 | 0000000 | 00000 |
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.
Ball Screw | Flange Ball Nut | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Lg., mm | Root Dia., mm | Tensile Strength, psi | Lg., mm | Dia., mm | Length Tolerance | No. of Thread Starts | Travel Distance per Turn, mm | Accuracy for Travel Distance per Turn | Hardness | Dynamic Thrust Load Capacity, lbs. | Max. Backlash, mm | Temp. Range, °F | Each | |
Carbon Steel Ball Screw with Alloy Steel Flange Ball Nut | |||||||||||||||
| M6 | 250 | 5.3 | 21,000 | 21 | 13 | Plus | 1 | 1 | ±0.210 mm per 300 mm | Rockwell C58 | 150 | 0.05 | 5° to 175° | 000000 | 0000000 |
| M8 | 250 | 6.6 | 21,000 | 28 | 20 | Plus | 1 | 2 | ±0.210 mm per 300 mm | Rockwell C58 | 470 | 0.05 | 5° to 175° | 000000 | 000000 |