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.
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 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 3/4"-5 | 1 ft. | 1 | 0.2" | ±0.007" per ft. | 0.65" | Rockwell C56 | 92,500 | -65° to 300° | 00000000 | 000000 |
| 3/4"-5 | 2 ft. | 1 | 0.2" | ±0.007" per ft. | 0.65" | Rockwell C56 | 92,500 | -65° to 300° | 00000000 | 00000 |
| 3/4"-5 | 3 ft. | 1 | 0.2" | ±0.007" per ft. | 0.65" | Rockwell C56 | 92,500 | -65° to 300° | 00000000 | 00000 |
| 3/4"-5 | 4 ft. | 1 | 0.2" | ±0.007" per ft. | 0.65" | Rockwell C56 | 92,500 | -65° to 300° | 00000000 | 000000 |
| 3/4"-5 | 5 ft. | 1 | 0.2" | ±0.007" per ft. | 0.65" | Rockwell C56 | 92,500 | -65° to 300° | 00000000 | 000000 |
| 3/4"-5 | 6 ft. | 1 | 0.2" | ±0.007" per ft. | 0.65" | Rockwell C56 | 92,500 | -65° to 300° | 00000000 | 000000 |
Ball screws with one machined end fit into an end support and are ready to connect to a motor. To adjust the length, the non-machined end can be cut to size.
Root diameter indicates the diameter the ball screw will be after machining away the threads.
Machined End | Keyway | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Root Dia. | Lg., ft. | No. of Thread Starts | Travel Distance per Turn | Accuracy for Travel Distance per Turn | Shoulder Lg. | Overall Lg. | Thread Size | Dia. | Lg. | Wd. | Hardness | Tensile Strength, psi | Temp., °F | Each | |
Alloy Steel | ||||||||||||||||
| 3/4"-5 | 0.65" | 2 | 1 | 0.2" | ±0.007" per ft. | 2 3/16" | 3 3/16" | 0.586"-32 | 1/2" | 1" | 1/8" | Rockwell C56 | 92,500 | -65° to 300° | 00000000 | 0000000 |
| 3/4"-5 | 0.65" | 4 | 1 | 0.2" | ±0.007" per ft. | 2 3/16" | 3 3/16" | 0.586"-32 | 1/2" | 1" | 1/8" | Rockwell C56 | 92,500 | -65° to 300° | 00000000 | 000000 |
| 3/4"-5 | 0.65" | 6 | 1 | 0.2" | ±0.007" per ft. | 2 3/16" | 3 3/16" | 0.586"-32 | 1/2" | 1" | 1/8" | Rockwell C56 | 92,500 | -65° to 300° | 00000000 | 000000 |
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.
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 | Each | ||
Black-Oxide Alloy Steel | |||||||||||||
| D | 3/4"-5 | 2 29/32" | 1 1/4" | 2 19/32" | 17/32" | 1 | 0.2" | 2 3/32" | Rockwell C56 | 1,900 | 0.015" | 00000000 | 0000000 |