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System of Measurement
Thread Size
Thread Direction
Component
Number of Thread Starts
Travel Distance per Turn
Hardness
Flange Material
Dynamic Thrust Load Capacity
Export Control Classification Number (ECCN)
DFARS Specialty Metals
Speed Ratio
Precision Acme Lead Screws and Nuts
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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
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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.
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., lb. | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Iron | ||||||||||||||
| 1 1/4"-5 | 2 1/2" | 3.734" | Acme | 1:1 | 1 | 0.2" | Acme Class 2C | Brinell 217 | Not Rated | Not Rated | 95365A143 | 0000000 | ||
932 Bearing Bronze | ||||||||||||||
| 1 1/4"-5 | 2 1/2" | 3.734" | Acme | 1:1 | 1 | 0.2" | Acme Class 2C | Brinell 65 | Not Rated | 7,850 | 1343K126 | 000000 | ||
Round Nuts—Left-Hand Thread
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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.
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., lb. | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Iron | ||||||||||||||
| 1 1/4"-5 | 2 1/2" | 3.734" | Acme | 1:1 | 1 | 0.2" | Acme Class 2C | Brinell 217 | Not Rated | Not Rated | 95365A343 | 0000000 | ||
932 Bearing Bronze | ||||||||||||||
| 1 1/4"-5 | 2 1/2" | 3.734" | Acme | 1:1 | 1 | 0.2" | Acme Class 2C | Brinell 65 | Not Rated | 7,850 | 1343K226 | 000000 | ||
Externally Threaded Nuts—Right-Hand Thread
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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.
PEEK—PEEK plastic nuts handle twice as much heat as PET and acetal plastic nuts. They have good chemical resistance and excellent 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, psi | Dynamic Thrust Load Cap., lb. | Temp., ° F | Each | |||
673 Bronze | |||||||||||||||||
| 1 1/4"-5 | 1 3/4" | 2.125" | Acme | 1:1 | 1 | 0.2" | 1 31/32"-18 | 13/16" | Acme Class 2C | Brinell 70 | Not Rated | Not Rated | — | 95072A118 | 0000000 | ||
PET | |||||||||||||||||
| 1 1/4"-5 | 1 3/4" | 2.125" | Acme | 1:1 | 1 | 0.2" | 1 31/32"-18 | 13/16" | Acme Class 2C | Not Rated | Not Rated | 3,900 | 15 to 175 | 95075A218 | 00000 | ||
PEEK | |||||||||||||||||
| 1 1/4"-5 | 1 3/4" | 2.125" | Acme | 1:1 | 1 | 0.2" | 1 31/32"-18 | 13/16" | Acme Class 2C | Not Rated | 16,000 | 3,900 | -40 to 525 | 90493A240 | 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 | ||||||||||||||||
| 1 1/4"-5 | 1 3/4" | 2.125" | Acme | 1:1 | 1 | 0.2" | 1 31/32"-18 | 13/16" | Acme Class 2C | Brinell 70 | Not Rated | Not Rated | 95072A218 | 0000000 | ||
Flange Nuts—Right-Hand Thread
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Flange nuts have wide, machinable surfaces for custom mounting.
932 Bearing 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.
Flange | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Thread Size | Lg. | Dia. | Dia. | Thk. | Thread Type | Speed Ratio | No. of Thread Starts | Travel Distance per Turn | Thread Fit | Hardness | Tensile Strength, psi | Dynamic Thrust Load Cap., lb. | Each | |||
932 Bearing Bronze | ||||||||||||||||
| 1 1/4"-5 | 3 3/4" | 1.875" | 3 1/4" | 5/8" | Acme | 1:1 | 1 | 0.2" | Acme Class 2C | Brinell 65 | 35,000 | 7,800 | 97790A180 | 0000000 | ||
Flanges
 |
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Flange Thread Size | Flange Dia. | Flange Thk. | Bolt Circle Dia. | Flange Hardness | Each | |||
|---|---|---|---|---|---|---|---|---|
1117 Carbon Steel | ||||||||
| 1 31/32"-18 | 4 13/64" | 53/64" | 3 7/16" | Brinell 156 | 95082A645 | 000000 | ||
Black-Oxide 1117 Carbon Steel | ||||||||
| 1 31/32"-18 | 4 13/64" | 53/64" | 3 7/16" | Brinell 135 | 1329K105 | 00000 | ||
303 Stainless Steel | ||||||||
| 1 31/32"-18 | 4 13/64" | 53/64" | 3 7/16" | Brinell 140 | 1329K15 | 000000 | ||
Acme Lead Screws and Nuts
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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
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Coupling nuts connect two lead screws.
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 | Hardness | Tensile Strength | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Carbon Steel | |||||||||||||
| 1 1/4"-5 | Acme | 3" | 1 5/8" | 1 | 1:1 | 0.2" | Acme Class 2G | Rockwell B75 | Not Rated | 93023A669 | 000000 | ||
18-8 Stainless Steel | |||||||||||||
| 1 1/4"-5 | Acme | 3" | 1 5/8" | 1 | 1:1 | 0.2" | Acme Class 2G | Not Rated | Not Rated | 93030A124 | 000000 | ||
Coupling Nuts—Left-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 | |||||||||||||
| 1 1/4"-5 | Acme | 3" | 1 5/8" | 1 | 1:1 | 0.2" | Acme Class 2G | Rockwell B75 | Not Rated | 93026A657 | 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 | |||||||||||||||
| 1 1/4"-5 | Acme | 2 1/2" | 2" | 3" | 3/4" | 1 | 1:1 | 0.2" | Acme Class 2G | Not Rated | Not Rated | 95120A175 | 0000000 | ||
Flange Nuts—Left-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 | |||||||||||||||
| 1 1/4"-5 | Acme | 2 1/2" | 2" | 3" | 3/4" | 1 | 1:1 | 0.2" | Acme Class 2G | Not Rated | Not Rated | 95120A575 | 0000000 | ||
Round Nuts—Right-Hand Thread
 |
Round nuts move objects along the length of a lead screw.
Cast Iron—Cast iron components have good machinability and high strength.
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 | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Cast Iron | ||||||||||||||
| 1 1/4"-5 | Acme | 2 1/2" | 3 47/64" | 1 | 1:1 | 0.2" | Acme Class 2G | Rockwell B96 | Not Rated | — | 95080A128 | 0000000 | ||
360 Brass | ||||||||||||||
| 1 1/4"-5 | Acme | 1 1/4" | 2" | 1 | 1:1 | 0.2" | Acme Class 2G | Rockwell B55 | Not Rated | ASTM B16 | 95100A127 | 00000 | ||
932 Bearing Bronze | ||||||||||||||
| 1 1/4"-5 | Acme | 2 1/64" | 2 5/32" | 1 | 1:1 | 0.2" | Acme Class 2G | Not Rated | Not Rated | ASTM B505 | 95090A129 | 00000 | ||
Round Nuts—Left-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 | ||||||||||||||
| 1 1/4"-5 | Acme | 1 1/4" | 2" | 1 | 1:1 | 0.2" | Acme Class 2G | Rockwell B55 | Not Rated | ASTM B16 | 95100A427 | 000000 | ||
932 Bearing Bronze | ||||||||||||||
| 1 1/4"-5 | Acme | 2 1/64" | 2 5/32" | 1 | 1:1 | 0.2" | Acme Class 2G | Not Rated | Not Rated | ASTM B505 | 95090A429 | 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 | ||||||||||||||
| 1 1/4"-5 | Acme | 1 7/32" | 2" | 1 | 1:1 | 0.2" | Acme Class 2G | Rockwell B75 | Not Rated | — | 94815A116 | 000000 | ||
Zinc-Plated Carbon Steel | ||||||||||||||
| 1 1/4"-5 | Acme | 1 1/4" | 2" | 1 | 1:1 | 0.2" | Acme Class 2G | Rockwell B75 | Not Rated | — | 98948A820 | 00000 | ||
360 Brass | ||||||||||||||
| 1 1/4"-5 | Acme | 1 1/4" | 2" | 1 | 1:1 | 0.2" | Acme Class 2G | Rockwell B75 | Not Rated | ASTM B16 | 95155A163 | 00000 | ||
18-8 Stainless Steel | ||||||||||||||
| 1 1/4"-5 | Acme | 1 7/32" | 2" | 1 | 1:1 | 0.2" | Acme Class 2G | Not Rated | Not Rated | — | 95066A221 | 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.
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.
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, psi | Specs. Met | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Carbon Steel | |||||||||||||||
| 1 1/4"-5 | Acme | 1 7/32" | 2" | 1 | 1:1 | 0.2" | Acme Class 2G | SAE Grade 2 | Rockwell B85 | 64,000 | — | 91808A112 | 000000 | ||
Zinc-Plated Carbon Steel | |||||||||||||||
| 1 1/4"-5 | Acme | 1 1/4" | 2" | 1 | 1:1 | 0.2" | Acme Class 2G | — | Rockwell B75 | Not Rated | — | 98948A220 | 00000 | ||
360 Brass | |||||||||||||||
| 1 1/4"-5 | Acme | 1 1/4" | 2" | 1 | 1:1 | 0.2" | Acme Class 2G | — | Rockwell B75 | Not Rated | ASTM B16 | 95155A363 | 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 | ||||||||||||||
| 1 1/4"-5 | Acme | 1 1/4" | 2" | 1 | 1:1 | 0.2" | Acme Class 2G | Rockwell B55 | Not Rated | ASTM B16 | 95270A163 | 000000 | ||
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 | ||||||||||||||
| 1 1/4"-5 | Acme | 1 1/4" | 2" | 1 | 1:1 | 0.2" | Acme Class 2G | Rockwell B55 | Not Rated | ASTM B16 | 95270A563 | 000000 | ||
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 | |||||||||||||
| 1 1/4"-5 | Acme | 1 1/8" | 9 1/2" | 1 | 1:1 | 0.2" | Acme Class 2G | Rockwell B72 | Not Rated | 92428A680 | 000000 | ||
Ball 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 | |||||||||||||
| 1 1/4"-5 | Acme | 1 1/8" | 9 1/2" | 1 | 1:1 | 0.2" | Acme Class 2G | Rockwell B72 | Not Rated | 92428A160 | 000000 | ||
