Selecting Compatible Lead Screws and Nuts
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Acme Lead Screws and Nuts
Found in hand-powered clamps, vises, grates, doors, and work tables, lead screws and nuts have broad, square threads that are well suited for quick assembly, high clamping forces, and lifting and lowering heavy objects. To ensure compatibility, please select components that have the same thread direction, thread size, and number of thread starts.
Carbon steel components are easier to machine than alloy steel components. Zinc-plated carbon steel components have mild corrosion resistance. Alloy steel components are harder and stronger than carbon steel components. 360 brass components have excellent machinability and good corrosion resistance. 18-8 stainless steel components have good corrosion resistance.
Travel distance per turn, also known as screw lead, is the distance a nut or handle 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 | Speed Ratio | Travel Distance per Turn | Thread Fit | Fastener Strength Grade/Class | Hardness | Tensile Strength, psi | Specifications Met | Each | |
Carbon Steel | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2 1/2"-4 | 12" | 1 | 1:1 | 0.25" | Class 2G | Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 000000000 | 0000000 |
| 2 1/2"-4 | 3 ft. | 1 | 1:1 | 0.25" | Class 2G | Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 000000000 | 000000 |
| 2 1/2"-4 | 6 ft. | 1 | 1:1 | 0.25" | Class 2G | Grade 2 | Rockwell B61 | 53,000 | ASTM A108 | 000000000 | 000000 |
Alloy Steel | |||||||||||
| 2 1/2"-4 | 3 ft. | 1 | 1:1 | 0.25" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 000000 |
Coupling nuts connect two lead screws.
| Thread Size | Ht. | Wd. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Each | |
Carbon Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 2 1/2"-4 | 5" | 3 1/2" | 1 | 1:1 | 0.25" | Class 2G | Rockwell B75 | 000000000 | 0000000 |
Hex nuts fasten and position lead screw components.
| Thread Size | Ht. | Wd. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Specifications Met | Each | |
Carbon Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 2 1/2"-4 | 2 1/2" | 3 1/2" | 1 | 1:1 | 0.25" | Class 2G | Rockwell B75 | __ | 000000000 | 0000000 |
Zinc-Plated Carbon Steel | ||||||||||
| 2 1/2"-4 | 2 1/2" | 3 1/2" | 1 | 1:1 | 0.25" | Class 2G | Rockwell B75 | __ | 000000000 | 000000 |
360 Brass | ||||||||||
| 2 1/2"-4 | 2 1/2" | 3 1/2" | 1 | 1:1 | 0.25" | Class 2G | Rockwell B75 | ASTM B16 | 000000000 | 000000 |
18-8 Stainless Steel | ||||||||||
| 2 1/2"-4 | 2 1/2" | 3 1/2" | 1 | 1:1 | 0.25" | Class 2G | Rockwell B97 | __ | 000000000 | 000000 |
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.
Carbon steel lead screws and flanges have good machinability.932 bearing bronze and 673 bronze nuts are wear resistant. They have good machinability and fair corrosion resistance.
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 | Speed Ratio | Travel Distance per Turn | Accuracy for Travel Distance per Turn | Thread Fit | Hardness | Tensile Strength, psi | Each | |
1018 Carbon Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 2 1/2"-4 | 3 ft. | 1 | 1:1 | 0.25" | ±0.009" per ft. | Class 2C | Brinell 126 | 64,000 | 000000000 | 0000000 |
| 2 1/2"-4 | 6 ft. | 1 | 1:1 | 0.25" | ±0.009" per ft. | Class 2C | Brinell 126 | 64,000 | 000000000 | 000000 |
Combine externally threaded nuts with a flange to create a custom flange nut.
External Thread | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Lg. | Dia. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Size | Lg. | Thread Fit | Hardness | Dynamic Thrust Load Cap., lbs. | Each | |
673 Bronze | ||||||||||||
| 2 1/2"-4 | 3 3/8" | 3.375" | 1 | 1:1 | 0.25" | 3 9/64"-12 | 1 9/16" | Class 2C | Brinell 70 | Not Rated | 000000000 | 0000000 |
Thread onto an externally threaded acme nut to create a custom flange nut.
Carbon steel flanges have good machinability. However, they will rust when exposed to moisture. Black-oxide carbon steel flanges have mild corrosion resistance in dry environments and a dark surface color. 303 stainless steel flanges have good corrosion resistance.
| Flange Thread Size | Flange Dia. | Flange Thick. | Bolt Circle Dia. | Flange Hardness | Each | |
1117 Carbon Steel | ||||||
|---|---|---|---|---|---|---|
| 3 9/64"-12 | 5 3/8" | 1 37/64" | 4 3/8" | Brinell 156 | 000000000 | 0000000 |