Selecting Compatible Lead Screws and Nuts
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Precision Acme Lead Screws and Nuts
Pair with a motor in automated motion and positioning applications. A tight thread fit allows these lead screws and nuts to make accurate, repeatable starts and stops. 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, please select components that have the same thread direction, thread size, and number of thread starts.
Black-oxide alloy steel lead screws are hard and strong. They have mild corrosion resistance and a dark surface color.
Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.
Right-hand-and-left-hand threaded lead screws have right-hand threads on one end and left-hand threads on the other. Use them where you want to drive nuts in opposite directions at the same time, such as for widening and narrowing chutes on packing and assembly lines. Note: A short length of threading at the center of the lead screw is not usable.
Usable Thread Lg. | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Type | Thread Size  | Lg. | Lg., ft. | Right Hand | Left Hand | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Accuracy for Travel Distance per Turn | Thread Fit | Hardness | Tensile Strength, psi | Each | |
Black-Oxide 4140 Alloy Steel | ||||||||||||||
| Acme | 3/8"-12 | 3 ft. | 3 | 17" | 17" | 1 | 1:1 | 0.083" | ±0.0003" per in. | Class 2C | Brinell 200 | 95,000 | 000000000 | 0000000 |
| Acme | 1/2"-10 | 3 ft. | 3 | 17" | 17" | 1 | 1:1 | 0.1" | ±0.0003" per in. | Class 2C | Brinell 200 | 95,000 | 000000000 | 000000 |
| Acme | 5/8"-8 | 3 ft. | 3 | 16 1/2" | 16 1/2" | 1 | 1:1 | 0.125" | ±0.0003" per in. | Class 2C | Brinell 200 | 95,000 | 000000000 | 000000 |
| Acme | 3/4"-6 | 3 ft. | 3 | 16 1/2" | 16 1/2" | 1 | 1:1 | 0.167" | ±0.0003" per in. | Class 2C | Brinell 200 | 95,000 | 000000000 | 000000 |
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 |
| 1" | 23 1/2" | 11 3/4" | Rockwell C27 | 2 3/8" | 7/8" | Brinell 60 | 1 | 1" | ±0.005" per in. | 130,000 | 150 | -50° to 350° | 000000000 | 00000000 |
| 1" | 29 1/2" | 17 3/4" | Rockwell C27 | 2 3/8" | 7/8" | Brinell 60 | 1 | 1" | ±0.005" per in. | 130,000 | 150 | -50° to 350° | 000000000 | 00000000 |