Selecting Compatible Lead Screws and Nuts
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Self-Stopping Ball Screws and Nuts
Keep your ball screw spinning without the ball nut damaging your system—a clutch-like collar inside the ball nut prevents it from travelling past the stop pins. Install the included stop pins anywhere along the length of the ball screw by drilling a hole in the valley of the threads (also known as the root) and pressing in the stop pin. When the collar meets the stop pin, the ball nut disengages from the threads and begins to idle. To start the ball nut travelling again, spin the ball screw in the opposite direction. All components are black-oxide steel and have mild corrosion resistance. To ensure compatibility, select components that have the same thread 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.
| 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 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 5/8"-6 | 1 7/8" | 1" | 2 | 0.188" | 15/16"-16 | Rockwell C56 | 300 | 0.006" | -65° to 300° | 0000000 | 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 | Temperature Range, °F | Each | |
Black-Oxide Alloy Steel | |||||||||||||
| 5/8"-6 | 1 7/8" | 1" | 2" | 13/32" | 2 | 0.188" | 1 5/8" | Rockwell C56 | 300 | 0.006" | -65° to 300° | 0000000 | 0000000 |
Self-Reversing Lead Screws and Nuts
A crisscross thread pattern allows you to drive the nut back and forth without changing the lead screw's direction of rotation. When the nut reaches one end of the lead screw, it changes direction and travels back to the other end. Also known as diamond lead screws, they're sometimes used to guide cable and wire as it's spooled on a reel.
Travel distance per turn, also known as screw lead, is the distance the nut moves with one revolution of the lead screw.
Lead Screw | Square Nut | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Screw Dia. | Lg. | Travel Lg. | Hardness | Overall Ht. | Center Ht. | Hardness | No. of Thread Starts | Travel Distance per Turn | Accuracy for Travel Distance per Turn | Tensile Strength, psi | Dynamic Thrust Load Cap., lbs. | Temperature Range, °F | Each | |
1144 Carbon Steel Lead Screw with Aluminum Square Nut | ||||||||||||||
| 3/4" | 16 7/8" | 5 13/16" | Rockwell C27 | 1 7/8" | 11/16" | Brinell 60 | 1 | 0.75" | ±0.007" per in. | 130,000 | 100 | -50° to 350° | 000000000 | 000000000 |
| 3/4" | 19 7/8" | 8 13/16" | Rockwell C27 | 1 7/8" | 11/16" | Brinell 60 | 1 | 0.75" | ±0.007" per in. | 130,000 | 100 | -50° to 350° | 000000000 | 00000000 |