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.
932 bearing bronze and 673 bronze nuts are wear resistant. They have good machinability and fair corrosion resistance. Cast iron nuts have good machinability and high strength.
Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.
| Thread Size  | Thread Type | Lg. | Dia. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Dynamic Thrust Load Cap., lbs. | Each | |
Cast Iron | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 1/4"-4 | Acme | 2 1/2" | 3.734" | 1 | 1:1 | 0.25" | Class 2C | Brinell 217 | Not Rated | 000000000 | 0000000 |
| 1 1/4"-5 | Acme | 2 1/2" | 3.734" | 1 | 1:1 | 0.2" | Class 2C | Brinell 217 | Not Rated | 000000000 | 000000 |
932 Bearing Bronze | |||||||||||
| 1 1/4"-4 | Acme | 2 1/2" | 3.734" | 1 | 1:1 | 0.25" | Class 2C | Brinell 65 | 7,850 | 00000000 | 000000 |
| 1 1/4"-5 | Acme | 2 1/2" | 3.734" | 1 | 1:1 | 0.2" | Class 2C | Brinell 65 | 7,850 | 00000000 | 000000 |
| Thread Size | Thread Type | Lg. | Dia. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Dynamic Thrust Load Cap., lbs. | Each | |
Cast Iron | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 1/4"-4 | Acme | 2 1/2" | 3.734" | 1 | 1:1 | 0.25" | Class 2C | Brinell 217 | Not Rated | 000000000 | 0000000 |
| 1 1/4"-5 | Acme | 2 1/2" | 3.734" | 1 | 1:1 | 0.2" | Class 2C | Brinell 217 | Not Rated | 000000000 | 000000 |
932 Bearing Bronze | |||||||||||
| 1 1/4"-4 | Acme | 2 1/2" | 3.734" | 1 | 1:1 | 0.25" | Class 2C | Brinell 65 | 7,850 | 00000000 | 000000 |
| 1 1/4"-5 | Acme | 2 1/2" | 3.734" | 1 | 1:1 | 0.2" | Class 2C | Brinell 65 | 7,850 | 00000000 | 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 | ||||||||||||||
| 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 | 000000000 |
| 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 |