Selecting Compatible Lead Screws and Nuts
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Ultra-Precision Lead Screws and Nuts
Operating with less backlash (play) than Precision Acme Lead Screws and Nuts, these provide increased nut life and more reliable movement in automated systems. 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. All components are corrosion resistant for use in harsh environments. To ensure compatibility, select components that have the same thread type, thread size, and number of thread starts.
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. | No. of Thread Starts | Thread Type | Speed Ratio | Travel Distance per Turn | Accuracy for Travel Distance per Turn | Hardness | Tensile Strength, psi | Each | |
303 Stainless Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 3/8"-40 | 3 ft. | 1 | Rounded Acme | 1:1 | 0.025" | ±0.0006" per in. | Brinell 160 | 90,000 | 00000000 | 0000000 |
| 3/8"-40 | 6 ft. | 1 | Rounded Acme | 1:1 | 0.025" | ±0.0006" per in. | Brinell 160 | 90,000 | 00000000 | 000000 |
Flange nuts with wear-compensating internal O-ring or wear-compensating spring maintain a tight fit even when their threads begin to wear. They resist backlash to maintain accuracy over time, which is important in positioning applications such as 3D printing and robotics.
Flange | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Lg. | Dia. | Dia. | Thick. | No. of Thread Starts | Thread Type | Speed Ratio | Travel Distance per Turn | Bolt Circle Dia. | Tensile Strength, psi | Dynamic Thrust Load Cap., lbs. | Each | ||
Acetal Plastic | ||||||||||||||
| B | 3/8"-40 | 1" | 0.625" | 1 7/64" | 3/16" | 1 | Rounded Acme | 1:1 | 0.025" | 7/8" | 9,700 | 75 | 00000000 | 000000 |
Acetal Plastic with Wear-Compensating Spring | ||||||||||||||
| C | 3/8"-40 | 1 29/32" | 0.703" | 1 1/2" | 3/16" | 1 | Rounded Acme | 1:1 | 0.025" | 1 1/8" | 9,700 | 10 | 00000000 | 00000 |