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. 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.
| Thread Type | 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 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Acme | 1/2"-8 | 12" | 1 | 1:1 | 0.125" | Class 2G | Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 000000000 | 000000 |
| Acme | 1/2"-8 | 3 ft. | 1 | 1:1 | 0.125" | Class 2G | Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 000000000 | 00000 |
| Acme | 1/2"-8 | 6 ft. | 1 | 1:1 | 0.125" | Class 2G | Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 000000000 | 00000 |
Alloy Steel | ||||||||||||
| Acme | 1/2"-8 | 12" | 1 | 1:1 | 0.125" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 00000 |
| Acme | 1/2"-8 | 3 ft. | 1 | 1:1 | 0.125" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 00000 |
| Acme | 1/2"-8 | 6 ft. | 1 | 1:1 | 0.125" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 000000 |
18-8 Stainless Steel | ||||||||||||
| Acme | 1/2"-8 | 12" | 1 | 1:1 | 0.125" | Class 2G | __ | Rockwell B96 | Not Rated | __ | 000000000 | 00000 |
| Acme | 1/2"-8 | 3 ft. | 1 | 1:1 | 0.125" | Class 2G | __ | Rockwell B96 | Not Rated | __ | 000000000 | 00000 |
| Acme | 1/2"-8 | 6 ft. | 1 | 1:1 | 0.125" | Class 2G | __ | Rockwell B96 | Not Rated | __ | 000000000 | 000000 |
| Thread Type | 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 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Acme | 1/2"-8 | 3 ft. | 1 | 1:1 | 0.125" | Class 2G | Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 000000000 | 000000 |
| Acme | 1/2"-8 | 6 ft. | 1 | 1:1 | 0.125" | Class 2G | Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 000000000 | 00000 |
Alloy Steel | ||||||||||||
| Acme | 1/2"-8 | 3 ft. | 1 | 1:1 | 0.125" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 00000 |
| Acme | 1/2"-8 | 6 ft. | 1 | 1:1 | 0.125" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 000000 |
Hex nuts fasten and position lead screw components.
| Thread Type | Thread Size | Ht. | Wd. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Each | |
Carbon Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Acme | 1/2"-8 | 31/64" | 7/8" | 1 | 1:1 | 0.125" | Class 2G | Rockwell B75 | 000000000 | 00000 |
Zinc-Plated Carbon Steel | ||||||||||
| Acme | 1/2"-8 | 31/64" | 7/8" | 1 | 1:1 | 0.125" | Class 2G | Rockwell B75 | 000000000 | 00000 |
18-8 Stainless Steel | ||||||||||
| Acme | 1/2"-8 | 31/64" | 7/8" | 1 | 1:1 | 0.125" | Class 2G | Rockwell B97 | 000000000 | 00000 |
Hex nuts fasten and position lead screw components.
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.
Carbon steel lead screws and flanges have good machinability. Black-oxide alloy steel lead screws are hard and strong. They have mild corrosion resistance. 303 and 304 stainless steel lead screws and flanges have good corrosion resistance.
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.
| Thread Type | 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 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Acme | 1/2"-8 | 3 ft. | 2 | 2:1 | 0.25" | ±0.009" per ft. | Class 2C | Brinell 126 | 64,000 | 000000000 | 000000 |
| Acme | 1/2"-8 | 6 ft. | 2 | 2:1 | 0.25" | ±0.009" per ft. | Class 2C | Brinell 126 | 64,000 | 000000000 | 00000 |
| Stub Acme | 1/2"-8 | 3 ft. | 8 | 8:1 | 1" | ±0.009" per ft. | Class 2C | Brinell 126 | 64,000 | 000000000 | 00000 |
| Stub Acme | 1/2"-8 | 6 ft. | 8 | 8:1 | 1" | ±0.009" per ft. | Class 2C | Brinell 126 | 64,000 | 000000000 | 00000 |
Black-Oxide 4140 Alloy Steel | |||||||||||
| Acme | 1/2"-8 | 3 ft. | 2 | 2:1 | 0.25" | ±0.009" per ft. | Class 2C | Brinell 271 | 125,000 | 000000000 | 00000 |
| Acme | 1/2"-8 | 6 ft. | 2 | 2:1 | 0.25" | ±0.009" per ft. | Class 2C | Brinell 271 | 125,000 | 000000000 | 000000 |
304 Stainless Steel | |||||||||||
| Acme | 1/2"-8 | 3 ft. | 2 | 2:1 | 0.25" | ±0.009" per ft. | Class 2C | Not Rated | Not Rated | 000000000 | 00000 |
| Acme | 1/2"-8 | 6 ft. | 2 | 2:1 | 0.25" | ±0.009" per ft. | Class 2C | Brinell 150 | 72,000 | 000000000 | 000000 |
| Stub Acme | 1/2"-8 | 3 ft. | 8 | 8:1 | 1" | ±0.009" per ft. | Class 2C | Not Rated | Not Rated | 000000000 | 00000 |
| Stub Acme | 1/2"-8 | 6 ft. | 8 | 8:1 | 1" | ±0.009" per ft. | Class 2C | Brinell 150 | 72,000 | 000000000 | 000000 |
| Thread Type | 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 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Acme | 1/2"-8 | 1" | 1.469" | 2 | 2:1 | 0.25" | Class 2C | Brinell 217 | Not Rated | __ | 000000000 | 000000 |
932 Bearing Bronze | ||||||||||||
| Acme | 1/2"-8 | 1" | 1.469" | 2 | 2:1 | 0.25" | Class 2C | Brinell 65 | 1,300 | __ | 0000000 | 00000 |
PET Plastic | ||||||||||||
| Acme | 1/2"-8 | 1" | 1.469" | 2 | 2:1 | 0.25" | Class 2C | Not Rated | 650 | 15° to 175° | 0000000 | 00000 |
Combine externally threaded nuts with a flange to create a custom flange nut.
External Thread | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Type | Thread Size | Lg. | Dia. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Size | Lg. | Thread Fit | Hardness | Dynamic Thrust Load Cap., lbs. | Temperature Range, °F | Each | |
673 Bronze | ||||||||||||||
| Acme | 1/2"-8 | 3/4" | 1.125" | 2 | 2:1 | 0.25" | 15/16"-16 | 1/2" | Class 2C | Brinell 70 | Not Rated | __ | 000000000 | 000000 |
| Stub Acme | 1/2"-8 | 3/4" | 1.125" | 8 | 8:1 | 1" | 15/16"-16 | 1/2" | Class 2C | Brinell 70 | Not Rated | __ | 000000000 | 00000 |
PET Plastic | ||||||||||||||
| Acme | 1/2"-8 | 3/4" | 1.125" | 2 | 2:1 | 0.25" | 15/16"-16 | 1/2" | Class 2C | Not Rated | 650 | 15° to 175° | 000000000 | 00000 |
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.
Fast-Travel Ultra-Precision Lead Screws and Nuts
Multiple thread channels (also known as thread starts) create faster linear travel than lead screws with a single thread start. Operating with less backlash (play) than Precision Acme Lead Screws and Nuts, these lead screws and nuts provide increased nut life and more reliable movement in automated systems. 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.
| 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 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1/2"-8 | 3ft. | 2 | Rounded Acme | 2:1 | 0.25" | ±0.0006" per in. | Brinell 160 | 90,000 | 00000000 | 0000000 |
| 1/2"-8 | 3ft. | 4 | Rounded Acme | 4:1 | 0.5" | ±0.0006" per in. | Brinell 160 | 90,000 | 00000000 | 000000 |
| 1/2"-8 | 3ft. | 8 | Rounded Acme | 8:1 | 1" | ±0.0006" per in. | Brinell 160 | 90,000 | 00000000 | 000000 |
| 1/2"-8 | 6ft. | 2 | Rounded Acme | 2:1 | 0.25" | ±0.0006" per in. | Brinell 160 | 90,000 | 00000000 | 000000 |
| 1/2"-8 | 6ft. | 4 | Rounded Acme | 4:1 | 0.5" | ±0.0006" per in. | Brinell 160 | 90,000 | 0000000 | 000000 |
| 1/2"-8 | 6ft. | 8 | Rounded Acme | 8:1 | 1" | ±0.0006" per in. | Brinell 160 | 90,000 | 0000000 | 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 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 | 1/2"-8 | 1 1/2" | 0.75" | 1 1/2" | 3/16" | 2 | Rounded Acme | 2:1 | 0.25" | 1 1/8" | 9,700 | 150 | 00000000 | 000000 |
| B | 1/2"-8 | 1 1/2" | 0.75" | 1 1/2" | 3/16" | 4 | Rounded Acme | 4:1 | 0.5" | 1 1/8" | 9,700 | 150 | 0000000 | 00000 |
| B | 1/2"-8 | 1 1/2" | 0.75" | 1 1/2" | 3/16" | 8 | Rounded Acme | 8:1 | 1" | 1 1/8" | 9,700 | 150 | 0000000 | 00000 |
Acetal Plastic with Wear-Compensating Spring | ||||||||||||||
| C | 1/2"-8 | 2" | 0.891" | 1 39/64" | 17/64" | 2 | Rounded Acme | 2:1 | 0.25" | 1 1/4" | 9,700 | 25 | 00000000 | 00000 |
| C | 1/2"-8 | 2" | 0.891" | 1 39/64" | 17/64" | 4 | Rounded Acme | 4:1 | 0.5" | 1 1/4" | 9,700 | 25 | 0000000 | 00000 |
| C | 1/2"-8 | 2" | 0.891" | 1 39/64" | 17/64" | 8 | Rounded Acme | 8:1 | 1" | 1 1/4" | 9,700 | 25 | 0000000 | 00000 |
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.
| 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 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1/2"-8 | 3 ft. | 1 | Rounded Acme | 1:1 | 0.125" | ±0.0006" per in. | Brinell 160 | 90,000 | 00000000 | 0000000 |
| 1/2"-8 | 6 ft. | 1 | Rounded Acme | 1:1 | 0.125" | ±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 | 1/2"-8 | 1 1/2" | 0.75" | 1 1/2" | 3/16" | 1 | Rounded Acme | 1:1 | 0.125" | 1 1/8" | 9,700 | 150 | 00000000 | 000000 |
Acetal Plastic with Wear-Compensating Spring | ||||||||||||||
| C | 1/2"-8 | 2" | 0.891" | 1 39/64" | 17/64" | 1 | Rounded Acme | 1:1 | 0.125" | 1 1/4" | 9,700 | 25 | 00000000 | 00000 |