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 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., ft. | No. of Thread Starts | Travel Distance per Turn | Accuracy for Travel Distance per Turn | Root Dia. | Hardness | Tensile Strength, psi | Temperature Range, °F | Each | |
Alloy Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 2 1/4"-2 | 3 | 1 | 0.5" | ±0.004" per ft. | 1.868" | Rockwell C56 | 85,000 | -40° to 300° | 00000000 | 0000000 |
| 2 1/4"-2 | 4 | 1 | 0.5" | ±0.004" per ft. | 1.868" | Rockwell C56 | 85,000 | -40° to 300° | 00000000 | 000000 |
| 2 1/4"-2 | 5 | 1 | 0.5" | ±0.004" per ft. | 1.868" | Rockwell C56 | 85,000 | -40° to 300° | 00000000 | 000000 |
| 2 1/4"-2 | 6 | 1 | 0.5" | ±0.004" per ft. | 1.868" | Rockwell C56 | 85,000 | -40° to 300° | 00000000 | 00000000 |
| 2 1/4"-2 | 7 | 1 | 0.5" | ±0.004" per ft. | 1.868" | Rockwell C56 | 85,000 | -40° to 300° | 00000000 | 00000000 |
| 2 1/4"-2 | 8 | 1 | 0.5" | ±0.004" per ft. | 1.868" | Rockwell C56 | 85,000 | -40° to 300° | 00000000 | 00000000 |
Secure a way wiper on the end of a ball nut to sweep chips and other contaminants out of the way as it moves across the ball screw.
| Thread Size | Lg. | Dia. | No. of Thread Starts | Travel Distance per Turn | External Thread Size | Hardness | Dynamic Thrust Load Cap., lbs. | Max. Backlash | Temperature Range, °F | Each | ||
Black-Oxide Alloy Steel | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A | 2 1/4"-2 | 6 11/16" | 3 3/8" | 1 | 0.5" | 3.137"-12 | Rockwell C56 | 19,250 | 0.015" | -40° to 300° | 00000000 | 000000000 |
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 | ||
Black-Oxide Alloy Steel | ||||||||||||||
| C | 2 1/4"-2 | 6 23/32" | 3 3/8" | 5 3/8" | 1 37/64" | 1 | 0.5" | 4 3/8" | Rockwell C56 | 19,250 | 0.015" | -40° to 300° | 00000000 | 000000000 |