Selecting Compatible Lead Screws and Nuts
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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.
Alloy steel lead screws are hard and strong.
Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.
| 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 | |
4140 Alloy Steel | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| M8 | 2 | 200 | 2 | Metric Rounded Trapezoidal | 2:1 | 4 | ±0.089 mm per 300 mm | Brinell 200 | 125,000 | 000000000 | 000000 |
Metric Ultra-Precision Lead Screws and Nuts
Operating with less backlash (play) than Metric Precision Acme Lead Screws and Nuts, these provide increased nut life and more reliable movement in automated systems. 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 size, thread type, thread size, thread pitch, and number of thread starts.
Alloy steel lead screws are hard and strong.
Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.
| 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 | |
4140 Alloy Steel | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| M8 | 1.5 | 200 | 1 | Metric Rounded Trapezoidal | 1:1 | 1.5 | ±0.089 mm per 300 mm | Brinell 200 | 125,000 | 0000000 | 000000 |
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.
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 | |||||||||||||||
| M10 | 200 | 8.6 | 21,000 | 28 | 23 | Plus | 1 | 2 | ±0.210 mm per 300 mm | Rockwell C58 | 510 | 0.05 | 5° to 175° | 0000000 | 0000000 |
| M12 | 200 | 10.6 | 21,000 | 30 | 25 | Plus | 1 | 2 | ±0.210 mm per 300 mm | Rockwell C58 | 560 | 0.05 | 5° to 175° | 000000 | 000000 |
Ball Screw/Splines and Bearings
From one compact system, transmit linear or rotary motion or both at once (sometimes called spiral motion). Because of these different motions, these ball screw/splines and bearings create efficient, fluid movements in complex automated applications, such as pick-and-place robots.
The ball bearings move smoothly and precisely, even at high speeds. They're powered independently, so you can drive one bearing at a time or both together to coordinate movements.
The ball screw/splines are hardened on the surface, so they stand up to repeated motion. They’re also hollow, so you can run electrical wiring, compressed air tubing, coolants, or lubricant through their center.
Spline | Thread | Ball Screw Bearing | Ball Spline Bearing | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | No. of | Lg. | Direction | ID, mm | Lg., mm | Root Dia., mm | OD, mm | Overall Lg., mm | Dynamic Load Cap., lbs. | Static Load Cap., lbs. | OD, mm | Overall Lg., mm | Dynamic Load Cap., lbs. | Static Load Cap., lbs. | Max. Dynamic Torque, in.-lbs. | Temp. Range, ° F | Each | |
Metric—1055 Carbon Steel | ||||||||||||||||||
8mm Dia. (Tolerance: -0.015mm to 0mm) | ||||||||||||||||||
| 200 mm | 4 | 180 mm | Right Hand | 3 | 200 | 7.44 | 19 | 28.5 | 240 | 400 | 16 | 25 | 330 | 580 | 17 | 5° to 176° | 0000000 | 000000000 |