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.
Carbon steel lead screws and flanges have good machinability. Black-oxide alloy steel lead screws are hard and strong. They have mild corrosion resistance and a dark surface color. 303 and 304 stainless steel lead screws and flanges have good corrosion resistance.
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.
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 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 1/4"-4 | 3 ft. | 1 | 1:1 | 0.25" | ±0.009" per ft. | Class 2C | Brinell 126 | 64,000 | 000000000 | 000000 |
| 1 1/4"-4 | 6 ft. | 1 | 1:1 | 0.25" | ±0.009" per ft. | Class 2C | Brinell 126 | 64,000 | 000000000 | 00000 |
Black-Oxide 4140 Alloy Steel | ||||||||||
| 1 1/4"-4 | 3 ft. | 1 | 1:1 | 0.25" | ±0.009" per ft. | Class 2C | Brinell 271 | 125,000 | 000000000 | 000000 |
| 1 1/4"-4 | 6 ft. | 1 | 1:1 | 0.25" | ±0.009" per ft. | Class 2C | Brinell 271 | 125,000 | 000000000 | 000000 |
304 Stainless Steel | ||||||||||
| 1 1/4"-4 | 18" | 1 | 1:1 | 0.25" | ±0.0003" per in. | Class 2C | Brinell 170 | 31,000 | 000000000 | 000000 |
| 1 1/4"-4 | 3 ft. | 1 | 1:1 | 0.25" | ±0.0003" per in. | Class 2C | Brinell 170 | 31,000 | 000000000 | 000000 |
| 1 1/4"-4 | 6 ft. | 1 | 1:1 | 0.25" | ±0.0003" per in. | Class 2C | Brinell 170 | 31,000 | 000000000 | 000000 |
| Thread Size | Lg. | Lg., ft. | 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 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 1/4"-4 | 3 ft. | 3 | 1 | 1:1 | 0.25" | ±0.009" per ft. | Class 2C | Brinell 126 | 64,000 | 000000000 | 000000 |
| 1 1/4"-4 | 6 ft. | 6 | 1 | 1:1 | 0.25" | ±0.009" per ft. | Class 2C | Brinell 126 | 64,000 | 000000000 | 000000 |
Black-Oxide 4140 Alloy Steel | |||||||||||
| 1 1/4"-4 | 3 ft. | 3 | 1 | 1:1 | 0.25" | ±0.009" per ft. | Class 2C | Brinell 271 | 125,000 | 000000000 | 000000 |
| 1 1/4"-4 | 6 ft. | 6 | 1 | 1:1 | 0.25" | ±0.009" per ft. | Class 2C | Brinell 271 | 125,000 | 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 | ||||||||||||
| 1 1/4"-4 | 1 3/4" | 2.125" | 1 | 1:1 | 0.25" | 1 31/32"-18 | 13/16" | Class 2C | Brinell 70 | Not Rated | 000000000 | 0000000 |
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 | ||||||||||||
| 1 1/4"-4 | 1 3/4" | 2.125" | 1 | 1:1 | 0.25" | 1 31/32"-18 | 13/16" | 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 | ||||||
|---|---|---|---|---|---|---|
| 1 31/32"-18 | 4 13/64" | 53/64" | 3 7/16" | Brinell 156 | 000000000 | 000000 |
Black-Oxide 1117 Carbon Steel | ||||||
| 1 31/32"-18 | 4 13/64" | 53/64" | 3 7/16" | Brinell 135 | 00000000 | 00000 |
303 Stainless Steel | ||||||
| 1 31/32"-18 | 4 13/64" | 53/64" | 3 7/16" | Brinell 140 | 0000000 | 000000 |
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. Cast iron components have good machinability and high strength. 932 bearing bronze components are more wear resistant than brass components. They have good machinability and fair 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 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 1/4"-4 | 12" | 1 | 1:1 | 0.25" | Class 2G | Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 000000000 | 000000 |
| 1 1/4"-4 | 3 ft. | 1 | 1:1 | 0.25" | Class 2G | Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 000000000 | 00000 |
| 1 1/4"-4 | 6 ft. | 1 | 1:1 | 0.25" | Class 2G | Grade 2 | Rockwell B61 | 53,000 | ASTM A108 | 000000000 | 000000 |
| 1 1/4"-4 | 12 ft. | 1 | 1:1 | 0.25" | Class 2G | Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 000000000 | 000000 |
Alloy Steel | |||||||||||
| 1 1/4"-4 | 12" | 1 | 1:1 | 0.25" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 00000 |
| 1 1/4"-4 | 3 ft. | 1 | 1:1 | 0.25" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 000000 |
| 1 1/4"-4 | 6 ft. | 1 | 1:1 | 0.25" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 000000 |
| 1 1/4"-4 | 12 ft. | 1 | 1:1 | 0.25" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 000000 |
18-8 Stainless Steel | |||||||||||
| 1 1/4"-4 | 3 ft. | 1 | 1:1 | 0.25" | Class 2G | __ | Rockwell B96 | Not Rated | __ | 000000000 | 000000 |
| 1 1/4"-4 | 6 ft. | 1 | 1:1 | 0.25" | Class 2G | __ | Rockwell B96 | Not Rated | __ | 000000000 | 000000 |
| 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 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 1/4"-4 | 3 ft. | 1 | 1:1 | 0.25" | Class 2G | Grade 2 | Rockwell B61 | 53,000 | ASTM A108 | 000000000 | 000000 |
| 1 1/4"-4 | 6 ft. | 1 | 1:1 | 0.25" | Class 2G | Grade 2 | Rockwell B61 | 53,000 | ASTM A108 | 000000000 | 000000 |
Alloy Steel | |||||||||||
| 1 1/4"-4 | 3 ft. | 1 | 1:1 | 0.25" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 000000 |
| 1 1/4"-4 | 6 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 | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 1/4"-4 | 3" | 1 5/8" | 1 | 1:1 | 0.25" | Class 2G | Rockwell B75 | 000000000 | 000000 |
Flange nuts move objects along the length of a lead screw. Flange nuts have a wide machinable flange for custom mounting.
Flange | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Ht. | Dia. | Dia. | Thick. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Each | |
932 Bearing Bronze | |||||||||||
| 1 1/4"-4 | 2 1/2" | 2" | 3" | 3/4" | 1 | 1:1 | 0.25" | Class 2G | Not Rated | 000000000 | 0000000 |
Flange nuts move objects along the length of a lead screw. Flange nuts have a wide machinable flange for custom mounting.
Flange | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Ht. | Dia. | Dia. | Thick. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Each | |
932 Bearing Bronze | |||||||||||
| 1 1/4"-4 | 2 1/2" | 2" | 3" | 3/4" | 1 | 1:1 | 0.25" | Class 2G | Not Rated | 000000000 | 0000000 |
Round nuts move objects along the length of a lead screw.
| Thread Size | Ht. | Dia. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Specifications Met | Each | |
932 Bearing Bronze | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 1/4"-4 | 2 1/64" | 2 5/32" | 1 | 1:1 | 0.25" | Class 2G | Not Rated | ASTM B505 | 000000000 | 000000 |
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 | Each | |
Carbon Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 1/4"-4 | 1 1/4" | 2" | 1 | 1:1 | 0.25" | Class 2G | Rockwell B75 | 000000000 | 000000 |
Zinc-Plated Carbon Steel | |||||||||
| 1 1/4"-4 | 1 7/32" | 2" | 1 | 1:1 | 0.25" | Class 2G | Rockwell B75 | 000000000 | 00000 |
18-8 Stainless Steel | |||||||||
| 1 1/4"-4 | 1 1/4" | 2" | 1 | 1:1 | 0.25" | Class 2G | Not Rated | 000000000 | 00000 |
Hex nuts fasten and position lead screw components.
| Thread Size | Ht. | Wd. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Fastener Strength Grade/Class | Hardness | Each | |
Carbon Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 1/4"-4 | 1 7/32" | 2" | 1 | 1:1 | 0.25" | Class 2G | Grade 2 | Rockwell B85 | 000000000 | 000000 |
Handles fasten and position lead screw components. Handles are easy to grip and tighten by hand for quick assembly and disassembly.
| Thread Size | Ht. | Wd. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Each | |
Cast Iron | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 1/4"-4 | 1 1/8" | 9 1/2" | 1 | 1:1 | 0.25" | Class 2G | Rockwell B72 | 000000000 | 000000 |
Handles fasten and position lead screw components. Handles are easy to grip and tighten by hand for quick assembly and disassembly.
| Thread Size | Ht. | Wd. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Each | |
Cast Iron | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 1/4"-4 | 1 1/8" | 9 1/2" | 1 | 1:1 | 0.25" | Class 2G | Rockwell B72 | 000000000 | 000000 |