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. 303 and 304 stainless steel lead screws have good corrosion resistance.
Acetal nuts have good wear and 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 | |
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 |
| M8 | 2 | 300 | 2 | Metric Rounded Trapezoidal | 2:1 | 4 | ±0.089 mm per 300 mm | Brinell 200 | 125,000 | 000000000 | 00000 |
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 | 00000 |
| M8 | 2.5 | 500 | 4 | Metric Rounded Trapezoidal | 4:1 | 10 | ±0.1 mm per 300 mm | Brinell 160 | 72,000 | 0000000 | 00000 |
| Thread Size | Thread Pitch, mm | Lg. | Dia. | No. of Thread Starts | Thread Type | Speed Ratio | Travel Distance per Turn, mm | Hardness | Tensile Strength, psi | Dynamic Thrust Load Cap. | Each | ||
Acetal Plastic | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A | M8 | 2.5 | 15/32" | 0.709" | 4 | Metric Rounded Trapezoidal | 4:1 | 10 | Durometer 74D | 10,000 | Not Rated | 0000000 | 000000 |
External Thread | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Thread Pitch, mm | Lg. | Dia. | Hex Wd. | No. of Thread Starts | Thread Type | Speed Ratio | Travel Distance per Turn, mm | Size | Lg. | Dynamic Thrust Load Cap., lbs. | Each | ||
Acetal Plastic | ||||||||||||||
| B | M8 | 2 | 1" | 0.548" | 11/16" | 2 | Metric Rounded Trapezoidal | 2:1 | 4 | 5/8"-18 | 1/4" | 75 | 000000000 | 000000 |
Flange | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Thread Pitch, mm | Lg. | Dia. | Dia. | Thick. | No. of Thread Starts | Thread Type | Speed Ratio | Travel Distance per Turn, mm | Bolt Circle Dia. | Dynamic Thrust Load Cap., lbs. | Each | ||
Acetal Plastic | ||||||||||||||
| E | M8 | 2 | 3/4" | 0.548" | 1 1/8" | 3/16" | 2 | Metric Rounded Trapezoidal | 2:1 | 4 | 7/8" | 75 | 000000000 | 000000 |
| F | M8 | 2.5 | 25/32" | 0.787" | 1 27/64" | 5/16" | 4 | Metric Rounded Trapezoidal | 4:1 | 10 | 1 7/64" | Not Rated | 0000000 | 00000 |
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.
Acetal nuts have good wear and 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 | |
4140 Alloy Steel | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| M8 | 1.5 | 100 | 1 | Metric Rounded Trapezoidal | 1:1 | 1.5 | ±0.089 mm per 300 mm | Brinell 200 | 125,000 | 0000000 | 000000 |
| M8 | 1.5 | 200 | 1 | Metric Rounded Trapezoidal | 1:1 | 1.5 | ±0.089 mm per 300 mm | Brinell 200 | 125,000 | 0000000 | 00000 |
| M8 | 1.5 | 300 | 1 | Metric Rounded Trapezoidal | 1:1 | 1.5 | ±0.089 mm per 300 mm | Brinell 200 | 125,000 | 0000000 | 00000 |
External Thread | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Thread Pitch, mm | Lg. | Dia. | Hex Wd. | No. of Thread Starts | Thread Type | Speed Ratio | Travel Distance per Turn, mm | Size | Lg. | Dynamic Thrust Load Cap., lbs. | Each | ||
Acetal Plastic | ||||||||||||||
| A | M8 | 1.5 | 1" | 0.548" | 11/16" | 1 | Metric Rounded Trapezoidal | 1:1 | 1.5 | 5/8"-18 | 1/4" | 75 | 0000000 | 000000 |
Flange | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Thread Pitch, mm | Lg. | Dia. | Dia. | Thick. | No. of Thread Starts | Thread Type | Speed Ratio | Travel Distance per Turn, mm | Bolt Circle Dia. | Dynamic Thrust Load Cap., lbs. | Each | ||
Acetal Plastic | ||||||||||||||
| D | M8 | 1.5 | 3/4" | 0.548" | 1 1/8" | 3/16" | 1 | Metric Rounded Trapezoidal | 1:1 | 1.5 | 7/8" | 75 | 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.
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 | |||||||||||||||
| M8 | 150 | 6.6 | 21,000 | 28 | 20 | Plus | 1 | 2 | ±0.210 mm per 300 mm | Rockwell C58 | 470 | 0.05 | 5° to 175° | 0000000 | 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 |
Metric Clamping Lead Screw Collars
Thread these one-piece collars onto a metric lead screw to separate and position components, or use them as an end stop to limit travel. Made of black-oxide steel, they have mild corrosion resistance. Tighten the clamping screws to secure.
To ensure compatibility, please select a collar that has the same thread type, direction, size, pitch, and number of thread starts as your lead screw.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Thread Pitch, mm | OD, mm | Wd., mm | No. of Thread Starts | Material | Hardness | Each | |
Right-Hand Threaded | ||||||||
|---|---|---|---|---|---|---|---|---|
| M8 | 1.5 | 18 | 9 | 1 | Black-Oxide 1215 Carbon Steel | Brinell 167 | 00000000 | 000000 |