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.
Black-oxide alloy steel ball screws and nuts have mild corrosion resistance.
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 | |
Alloy Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 1/2"-4 | 2 ft. | 1 | 0.25" | ±0.007" per ft. | 1.375" | Rockwell C56 | 200,000 | -65° to 300° | 00000000 | 0000000 |
| 1 1/2"-4 | 3 ft. | 1 | 0.25" | ±0.007" per ft. | 1.375" | Rockwell C56 | 200,000 | -65° to 300° | 00000000 | 000000 |
| 1 1/2"-4 | 4 ft. | 1 | 0.25" | ±0.007" per ft. | 1.375" | Rockwell C56 | 200,000 | -65° to 300° | 00000000 | 000000 |
| 1 1/2"-4 | 5 ft. | 1 | 0.25" | ±0.007" per ft. | 1.375" | Rockwell C56 | 200,000 | -65° to 300° | 00000000 | 000000 |
| 1 1/2"-4 | 6 ft. | 1 | 0.25" | ±0.007" per ft. | 1.375" | Rockwell C56 | 200,000 | -65° to 300° | 00000000 | 000000 |
| 1 1/2"-4 | 7 ft. | 1 | 0.25" | ±0.007" per ft. | 1.375" | Rockwell C56 | 200,000 | -65° to 300° | 00000000 | 000000 |
| 1 1/2"-4 | 8 ft. | 1 | 0.25" | ±0.007" per ft. | 1.375" | Rockwell C56 | 200,000 | -65° to 300° | 00000000 | 000000 |
| Thread Size | Lg. | No. of Thread Starts | Travel Distance per Turn | External Thread Size | Hardness | Dynamic Thrust Load Cap., lbs. | Max. Backlash | Temp. Range, °F | Each | ||
Black-Oxide Alloy Steel | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| A | 1 1/2"-4 | 3" | 1 | 0.25" | 1 31/32"-18 | Rockwell C56 | 4,250 | 0.015" | -65° to 300° | 00000000 | 0000000 |
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 | Temp. Range, °F | Each | ||
Black-Oxide Alloy Steel | ||||||||||||||
| D | 1 1/2"-4 | 3 1/32" | 2 3/32" | 4 23/64" | 17/32" | 1 | 0.25" | 3 7/16" | Rockwell C56 | 4,250 | 0.015" | -65° to 300° | 00000000 | 0000000 |