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. PET plastic nuts are lightweight and corrosion resistant.
Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.
For technical drawings and 3-D models, click on a part number.
| Thread Size  | Lg. | Dia. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Dynamic Thrust Load Cap., lbs. | Temperature Range, °F | Each | |
Cast Iron | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 3/8"-8 | 3/4" | 1.344" | 1 | 1:1 | 0.125" | Class 2C | Brinell 217 | Not Rated | __ | 000000000 | 000000 |
| 3/8"-10 | 3/4" | 1.344" | 1 | 1:1 | 0.1" | Class 2C | Brinell 217 | Not Rated | __ | 000000000 | 00000 |
| 3/8"-12 | 3/4" | 1.344" | 1 | 1:1 | 0.083" | Class 2C | Brinell 217 | Not Rated | __ | 000000000 | 00000 |
| 3/8"-16 | 3/4" | 1.344" | 1 | 1:1 | 0.063" | Class 2C | Brinell 217 | Not Rated | __ | 000000000 | 00000 |
932 Bearing Bronze | |||||||||||
| 3/8"-8 | 3/4" | 1.344" | 1 | 1:1 | 0.125" | Class 2C | Brinell 65 | 700 | __ | 00000000 | 00000 |
| 3/8"-10 | 3/4" | 1.344" | 1 | 1:1 | 0.1" | Class 2C | Brinell 65 | 700 | __ | 00000000 | 00000 |
| 3/8"-12 | 3/4" | 1.344" | 1 | 1:1 | 0.083" | Class 2C | Brinell 65 | 700 | __ | 00000000 | 00000 |
| 3/8"-16 | 3/4" | 1.344" | 1 | 1:1 | 0.063" | Class 2C | Brinell 65 | 700 | __ | 0000000 | 00000 |
PET Plastic | |||||||||||
| 3/8"-8 | 3/4" | 1.344" | 1 | 1:1 | 0.125" | Class 2C | Not Rated | 350 | 15° to 175° | 00000000 | 00000 |
| 3/8"-10 | 3/4" | 1.344" | 1 | 1:1 | 0.1" | Class 2C | Not Rated | 350 | 15° to 175° | 00000000 | 00000 |
| 3/8"-12 | 3/4" | 1.344" | 1 | 1:1 | 0.083" | Class 2C | Not Rated | 350 | 15° to 175° | 00000000 | 00000 |
| 3/8"-16 | 3/4" | 1.344" | 1 | 1:1 | 0.063" | Class 2C | Not Rated | 350 | 15° to 175° | 0000000 | 00000 |
| Thread Size | Lg. | Dia. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Dynamic Thrust Load Cap., lbs. | Temperature Range, °F | Each | |
Cast Iron | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 3/8"-8 | 3/4" | 1.344" | 1 | 1:1 | 0.125" | Class 2C | Brinell 217 | Not Rated | __ | 000000000 | 000000 |
| 3/8"-10 | 3/4" | 1.344" | 1 | 1:1 | 0.1" | Class 2C | Brinell 217 | Not Rated | __ | 000000000 | 00000 |
| 3/8"-12 | 3/4" | 1.344" | 1 | 1:1 | 0.083" | Class 2C | Brinell 217 | Not Rated | __ | 000000000 | 00000 |
| 3/8"-16 | 3/4" | 1.344" | 1 | 1:1 | 0.063" | Class 2C | Brinell 217 | Not Rated | __ | 000000000 | 00000 |
932 Bearing Bronze | |||||||||||
| 3/8"-8 | 3/4" | 1.344" | 1 | 1:1 | 0.125" | Class 2C | Brinell 65 | 700 | __ | 00000000 | 00000 |
| 3/8"-10 | 3/4" | 1.344" | 1 | 1:1 | 0.1" | Class 2C | Brinell 65 | 700 | __ | 00000000 | 00000 |
| 3/8"-12 | 3/4" | 1.344" | 1 | 1:1 | 0.083" | Class 2C | Brinell 65 | 700 | __ | 00000000 | 00000 |
PET Plastic | |||||||||||
| 3/8"-8 | 3/4" | 1.344" | 1 | 1:1 | 0.125" | Class 2C | Not Rated | 350 | 15° to 175° | 00000000 | 00000 |
| 3/8"-10 | 3/4" | 1.344" | 1 | 1:1 | 0.1" | Class 2C | Not Rated | 350 | 15° to 175° | 00000000 | 00000 |
| 3/8"-12 | 3/4" | 1.344" | 1 | 1:1 | 0.083" | Class 2C | Not Rated | 350 | 15° to 175° | 00000000 | 00000 |
Fast-Travel Precision Acme Lead Screws and Nuts
Multiple thread channels (also known as thread starts) create faster linear travel than lead screws with a single thread start. The threads have a tight thread fit for accurate, repeatable starts and stops. Pair with a motor in automated motion and positioning applications. To ensure compatibility, please select components that have the same thread direction, thread size, and number of thread starts.
Cast iron nuts have good machinability and high strength. 932 bearing bronze and 673 bronze nuts are wear resistant. They have good machinability and fair corrosion resistance. PET plastic nuts are lightweight and corrosion resistant.
Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Lg. | Dia. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Dynamic Thrust Load Cap., lbs. | Temperature Range, °F | Each | |
Cast Iron | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/4"-12 | 3/4" | 1.344" | 4 | 4:1 | 0.333" | Class 2C | Brinell 217 | Not Rated | __ | 000000000 | 0000000 |
| 3/8"-8 | 3/4" | 1.344" | 2 | 2:1 | 0.25" | Class 2C | Brinell 217 | Not Rated | __ | 000000000 | 00000 |
| 3/8"-8 | 3/4" | 1.344" | 4 | 4:1 | 0.5" | Class 2C | Brinell 217 | Not Rated | __ | 000000000 | 00000 |
| 3/8"-10 | 3/4" | 1.344" | 2 | 2:1 | 0.2" | Class 2C | Brinell 217 | Not Rated | __ | 000000000 | 00000 |
932 Bearing Bronze | |||||||||||
| 1/4"-12 | 3/4" | 1.344" | 4 | 4:1 | 0.333" | Class 2C | Brinell 65 | 320 | __ | 00000000 | 00000 |
| 3/8"-8 | 3/4" | 1.344" | 2 | 2:1 | 0.25" | Class 2C | Brinell 65 | 700 | __ | 00000000 | 00000 |
| 3/8"-8 | 3/4" | 1.344" | 4 | 4:1 | 0.5" | Class 2C | Brinell 65 | 700 | __ | 00000000 | 00000 |
| 3/8"-10 | 3/4" | 1.344" | 2 | 2:1 | 0.2" | Class 2C | Brinell 65 | 700 | __ | 00000000 | 00000 |
PET Plastic | |||||||||||
| 1/4"-12 | 3/4" | 1.344" | 4 | 4:1 | 0.333" | Class 2C | Not Rated | 160 | 15° to 175° | 00000000 | 00000 |
| 3/8"-8 | 3/4" | 1.344" | 2 | 2:1 | 0.25" | Class 2C | Not Rated | 350 | 15° to 175° | 00000000 | 00000 |
| 3/8"-8 | 3/4" | 1.344" | 4 | 4:1 | 0.5" | Class 2C | Not Rated | 350 | 15° to 175° | 00000000 | 00000 |
| 3/8"-10 | 3/4" | 1.344" | 2 | 2:1 | 0.2" | Class 2C | Not Rated | 350 | 15° to 175° | 00000000 | 00000 |
| Thread Size | Lg. | Dia. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Dynamic Thrust Load Cap., lbs. | Each | |
932 Bearing Bronze | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1/4"-12 | 3/4" | 1.344" | 4 | 4:1 | 0.333" | Class 2C | Brinell 65 | 320 | 00000000 | 000000 |
| 3/8"-8 | 3/4" | 1.344" | 2 | 2:1 | 0.25" | Class 2C | Brinell 65 | 700 | 00000000 | 00000 |
| 3/8"-8 | 3/4" | 1.344" | 4 | 4:1 | 0.5" | Class 2C | Brinell 65 | 700 | 00000000 | 00000 |
| 3/8"-10 | 3/4" | 1.344" | 2 | 2:1 | 0.2" | Class 2C | Brinell 65 | 700 | 00000000 | 00000 |