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About Lead Screws and Nuts
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Compare lead screws and nuts by the size, direction, fit, and starts of their threads.
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.
Coupling Nuts—Right-Hand Thread
 |
Coupling nuts connect two lead screws.
Carbon Steel—Carbon steel components are easier to machine than alloy steel components.
Travel Distance per Turn—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 Size | Thread Type | Ht. | Wd. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Tensile Strength | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Carbon Steel | |||||||||||||
| 3/8"-12 | Acme | 1 7/8" | 1/2" | 1 | 1:1 | 0.083" | Acme Class 2G | Rockwell B75 | Not Rated | 93023A661 | 000000 | ||
Flange Nuts—Right-Hand Thread
 |
Flange nuts move objects along the length of a lead screw. Flange nuts have a wide machinable flange for custom mounting.
932 Bearing Bronze—932 bearing bronze components are more wear resistant than brass components. They have good machinability and fair corrosion resistance.
Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut or handle moves with one revolution of the lead screw.
Flange | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Thread Size | Thread Type | Ht. | Dia. | Dia. | Thk. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Tensile Strength | Each | |||
932 Bearing Bronze | |||||||||||||||
| 3/8"-12 | Acme | 7/8" | 1/2" | 1" | 1/8" | 1 | 1:1 | 0.083" | Acme Class 2G | Not Rated | Not Rated | 95120A592 | 0000000 | ||
Round Nuts—Right-Hand Thread
 |
Round nuts move objects along the length of a lead screw.
360 Brass—360 brass components have excellent machinability and good corrosion resistance.
932 Bearing Bronze—932 bearing bronze components are more wear resistant than brass components. They have good machinability and fair corrosion resistance.
Travel Distance per Turn—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 Size | Thread Type | Ht. | Dia. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Tensile Strength | Specs. Met | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
360 Brass | ||||||||||||||
| 3/8"-12 | Acme | 3/8" | 3/4" | 1 | 1:1 | 0.083" | Acme Class 2G | Rockwell B55 | Not Rated | ASTM B16 | 95100A101 | 00000 | ||
932 Bearing Bronze | ||||||||||||||
| 3/8"-12 | Acme | 3/4" | 7/8" | 1 | 1:1 | 0.083" | Acme Class 2G | Not Rated | Not Rated | ASTM B505 | 95090A502 | 00000 | ||
Hex Nuts—Right-Hand Thread
 |
Hex nuts fasten and position lead screw components.
Carbon Steel—Carbon steel components are easier to machine than alloy steel components.
Zinc-Plated Carbon Steel—Zinc-plated carbon steel components have mild corrosion resistance and are easier to machine than alloy steel components.
360 Brass—360 brass components have excellent machinability and good corrosion resistance.
18-8 Stainless Steel—18-8 stainless steel components have good corrosion resistance.
Travel Distance per Turn—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 Size | Thread Type | Ht. | Wd. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Tensile Strength | Specs. Met | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Carbon Steel | ||||||||||||||
| 3/8"-12 | Acme | 23/64" | 11/16" | 1 | 1:1 | 0.083" | Acme Class 2G | Rockwell B75 | Not Rated | — | 94815A106 | 00000 | ||
Zinc-Plated Carbon Steel | ||||||||||||||
| 3/8"-12 | Acme | 23/64" | 11/16" | 1 | 1:1 | 0.083" | Acme Class 2G | Rockwell B75 | Not Rated | — | 98948A114 | 00000 | ||
360 Brass | ||||||||||||||
| 3/8"-12 | Acme | 3/8" | 3/4" | 1 | 1:1 | 0.083" | Acme Class 2G | Rockwell B75 | Not Rated | ASTM B16 | 95155A111 | 0000 | ||
18-8 Stainless Steel | ||||||||||||||
| 3/8"-12 | Acme | 23/64" | 11/16" | 1 | 1:1 | 0.083" | Acme Class 2G | Not Rated | Not Rated | — | 95066A208 | 00000 | ||
Hex Nuts—Left-Hand Thread
|
Hex nuts fasten and position lead screw components.
Carbon Steel—Carbon steel components are easier to machine than alloy steel components.
18-8 Stainless Steel—18-8 stainless steel components have good corrosion resistance.
Travel Distance per Turn—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 Size | Thread Type | Ht. | Wd. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Fastener Strength Grade/Class | Hardness | Tensile Strength | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Carbon Steel | ||||||||||||||
| 3/8"-12 | Acme | 23/64" | 11/16" | 1 | 1:1 | 0.083" | Acme Class 2G | SAE Grade 2 | Rockwell B85 | 64,000 psi | 91808A106 | 00000 | ||
18-8 Stainless Steel | ||||||||||||||
| 3/8"-12 | Acme | 23/64" | 11/16" | 1 | 1:1 | 0.083" | Acme Class 2G | — | Not Rated | Not Rated | 95066A408 | 00000 | ||
Square Nuts—Right-Hand Thread
 |
Square nuts fasten and position lead screw components. Square nuts have large sides, which make them easier to grip with a wrench than hex nuts and keep them from rotating in channels and square holes.
360 Brass—360 brass components have excellent machinability and good corrosion resistance.
Travel Distance per Turn—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 Size | Thread Type | Ht. | Wd. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Tensile Strength | Specs. Met | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
360 Brass | ||||||||||||||
| 3/8"-12 | Acme | 3/8" | 3/4" | 1 | 1:1 | 0.083" | Acme Class 2G | Rockwell B55 | Not Rated | ASTM B16 | 95270A111 | 00000 | ||
Square Nuts—Left-Hand Thread
|
Square nuts fasten and position lead screw components. Square nuts have large sides, which make them easier to grip with a wrench than hex nuts and keep them from rotating in channels and square holes.
360 Brass—360 brass components have excellent machinability and good corrosion resistance.
Travel Distance per Turn—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 Size | Thread Type | Ht. | Wd. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Tensile Strength | Specs. Met | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
360 Brass | ||||||||||||||
| 3/8"-12 | Acme | 3/8" | 3/4" | 1 | 1:1 | 0.083" | Acme Class 2G | Rockwell B55 | Not Rated | ASTM B16 | 95270A511 | 00000 | ||
Flat Handles—Right-Hand Thread
 |
Handles fasten and position lead screw components. Handles are easy to grip and tighten by hand for quick assembly and disassembly.
Cast Iron—Cast iron components have good machinability and high strength.
Travel Distance per Turn—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 Size | Thread Type | Ht. | Wd. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Tensile Strength | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Cast Iron | |||||||||||||
| 3/8"-12 | Acme | 1 1/8" | 9 1/2" | 1 | 1:1 | 0.083" | Acme Class 2G | Rockwell B72 | Not Rated | 92428A741 | 000000 | ||
Offset Handles—Right-Hand Thread
 |
Handles fasten and position lead screw components. Handles are easy to grip and tighten by hand for quick assembly and disassembly.
Cast Iron—Cast iron components have good machinability and high strength.
Travel Distance per Turn—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 Size | Thread Type | Ht. | Wd. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Tensile Strength | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Cast Iron | |||||||||||||
| 3/8"-12 | Acme | 1 3/4" | 4 1/4" | 1 | 1:1 | 0.083" | Acme Class 2G | Rockwell B67 | Not Rated | 98890A111 | 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.
Round Nuts—Right-Hand Thread
 |
Iron—Iron nuts have good machinability and high strength.
932 Bearing Bronze—932 bearing bronze and 673 bronze nuts are wear resistant. They have good machinability and fair corrosion resistance.
PET—PET plastic nuts are lightweight and corrosion resistant.
Travel Distance per Turn—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. | Dia. | Thread Type | Speed Ratio | No. of Thread Starts | Travel Distance per Turn | Thread Fit | Hardness | Tensile Strength | Dynamic Thrust Load Cap. | Temp., ° F | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Iron | |||||||||||||||
| 3/8"-12 | 3/4" | 1.344" | Acme | 1:1 | 1 | 0.083" | Acme Class 2C | Brinell 217 | Not Rated | Not Rated | — | 95365A111 | 000000 | ||
932 Bearing Bronze | |||||||||||||||
| 3/8"-12 | 3/4" | 1.344" | Acme | 1:1 | 1 | 0.083" | Acme Class 2C | Brinell 65 | Not Rated | 700 lb. | — | 1343K138 | 00000 | ||
PET | |||||||||||||||
| 3/8"-12 | 3/4" | 1.344" | Acme | 1:1 | 1 | 0.083" | Acme Class 2C | Not Rated | Not Rated | 350 lb. | 15 to 175 | 1349K149 | 00000 | ||
Round Nuts—Left-Hand Thread
|
Iron—Iron nuts have good machinability and high strength.
932 Bearing Bronze—932 bearing bronze and 673 bronze nuts are wear resistant. They have good machinability and fair corrosion resistance.
PET—PET plastic nuts are lightweight and corrosion resistant.
Travel Distance per Turn—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. | Dia. | Thread Type | Speed Ratio | No. of Thread Starts | Travel Distance per Turn | Thread Fit | Hardness | Tensile Strength | Dynamic Thrust Load Cap. | Temp., ° F | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Iron | |||||||||||||||
| 3/8"-12 | 3/4" | 1.344" | Acme | 1:1 | 1 | 0.083" | Acme Class 2C | Brinell 217 | Not Rated | Not Rated | — | 95365A311 | 000000 | ||
932 Bearing Bronze | |||||||||||||||
| 3/8"-12 | 3/4" | 1.344" | Acme | 1:1 | 1 | 0.083" | Acme Class 2C | Brinell 65 | Not Rated | 700 lb. | — | 1343K238 | 00000 | ||
PET | |||||||||||||||
| 3/8"-12 | 3/4" | 1.344" | Acme | 1:1 | 1 | 0.083" | Acme Class 2C | Not Rated | Not Rated | 350 lb. | 15 to 175 | 1349K151 | 00000 | ||
Externally Threaded Nuts—Right-Hand Thread
 |
Combine externally threaded nuts with a flange to create a custom flange nut.
673 Bronze—932 bearing bronze and 673 bronze nuts are wear resistant. They have good machinability and fair corrosion resistance.
PET—PET plastic nuts are lightweight and corrosion resistant.
Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.
External Thread | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Thread Size | Lg. | Dia. | Thread Type | Speed Ratio | No. of Thread Starts | Travel Distance per Turn | Size | Lg. | Thread Fit | Hardness | Tensile Strength | Dynamic Thrust Load Cap. | Temp., ° F | Each | |||
673 Bronze | |||||||||||||||||
| 3/8"-12 | 5/8" | 0.688" | Acme | 1:1 | 1 | 0.083" | 9/16"-18 | 3/8" | Acme Class 2C | Brinell 70 | Not Rated | Not Rated | — | 95072A108 | 000000 | ||
PET | |||||||||||||||||
| 3/8"-12 | 5/8" | 0.688" | Acme | 1:1 | 1 | 0.083" | 9/16"-18 | 3/8" | Acme Class 2C | Not Rated | Not Rated | 350 lb. | 15 to 175 | 95075A104 | 00000 | ||
Externally Threaded Nuts—Left-Hand Thread
|
Combine externally threaded nuts with a flange to create a custom flange nut.
673 Bronze—932 bearing bronze and 673 bronze nuts are wear resistant. They have good machinability and fair corrosion resistance.
Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.
External Thread | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Thread Size | Lg. | Dia. | Thread Type | Speed Ratio | No. of Thread Starts | Travel Distance per Turn | Size | Lg. | Thread Fit | Hardness | Tensile Strength | Dynamic Thrust Load Cap. | Each | |||
673 Bronze | ||||||||||||||||
| 3/8"-12 | 5/8" | 0.688" | Acme | 1:1 | 1 | 0.083" | 9/16"-18 | 3/8" | Acme Class 2C | Brinell 70 | Not Rated | Not Rated | 95072A208 | 000000 | ||
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.
Externally Threaded Nuts—Right-Hand Thread
 |
Combine externally threaded nuts with a flange to create a custom flange nut.
673 Bronze—932 bearing bronze and 673 bronze nuts are wear resistant. They have good machinability and fair corrosion resistance.
Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.
External Thread | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Thread Size | Lg. | Dia. | Thread Type | Speed Ratio | No. of Thread Starts | Travel Distance per Turn | Size | Lg. | Thread Fit | Hardness | Tensile Strength | Dynamic Thrust Load Cap. | Each | |||
673 Bronze | ||||||||||||||||
| 3/8"-12 | 5/8" | 0.688" | Acme | 2:1 | 2 | 0.167" | 9/16"-18 | 3/8" | Acme Class 2C | Brinell 70 | Not Rated | Not Rated | 95072A771 | 000000 | ||
Externally Threaded Nuts—Left-Hand Thread
|
Combine externally threaded nuts with a flange to create a custom flange nut.
673 Bronze—932 bearing bronze and 673 bronze nuts are wear resistant. They have good machinability and fair corrosion resistance.
Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.
External Thread | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Thread Size | Lg. | Dia. | Thread Type | Speed Ratio | No. of Thread Starts | Travel Distance per Turn | Size | Lg. | Thread Fit | Hardness | Tensile Strength | Dynamic Thrust Load Cap. | Each | |||
673 Bronze | ||||||||||||||||
| 3/8"-12 | 5/8" | 0.688" | Acme | 2:1 | 2 | 0.167" | 9/16"-18 | 3/8" | Acme Class 2C | Brinell 70 | Not Rated | Not Rated | 95072A772 | 000000 | ||
Fast-Travel Ultra-Precision Lead Screws and Nuts
 |  |  |
Style B | Style C |
Flange Nuts—Right-Hand Thread
| |
Style B | Style C |
 |  |
Style B | Style C |
Acetal—Acetal nuts have good wear and corrosion resistance.
Wear-Compensating Spring—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.
Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.
Flange | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Style | Thread Size | Lg. | Dia. | Dia. | Thk. | Thread Type | Speed Ratio | Bolt Circle Dia. | No. of Thread Starts | Travel Distance per Turn | Hardness | Tensile Strength, psi | Dynamic Thrust Load Cap., lb. | No. of Mounting Holes | Each | |||
Acetal | ||||||||||||||||||
| B | 3/8"-12 | 1" | 0.625" | 1 7/64" | 3/16" | Rounded Acme | 3:1 | 7/8" | 3 | 0.25" | Not Rated | 9,700 | 75 | 3 | 6350K151 | 000000 | ||
Acetal with Wear-Compensating Spring | ||||||||||||||||||
| C | 3/8"-12 | 1 29/32" | 0.703" | 1 1/2" | 3/16" | Rounded Acme | 3:1 | 1 1/8" | 3 | 0.25" | Not Rated | 9,700 | 10 | 3 | 6350K188 | 00000 | ||
