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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.
Lead Screws—Right-Hand Thread
 |
Carbon Steel—Carbon steel components are easier to machine than alloy steel components.
Alloy Steel—Alloy steel components are harder and stronger than carbon 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 | Lg. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Fastener Strength Grade/Class | Hardness | Tensile Strength | Specs. Met | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Carbon Steel | ||||||||||||||
| 1/2"-8 | Acme | 12" | 1 | 1:1 | 0.125" | Acme Class 2G | SAE Grade 2 | Rockwell B61 | 64,000 psi | ASTM A108 | 98935A715 | 00000 | ||
| 1/2"-8 | Acme | 3 ft. | 1 | 1:1 | 0.125" | Acme Class 2G | SAE Grade 2 | Rockwell B61 | 64,000 psi | ASTM A108 | 98935A820 | 00000 | ||
| 1/2"-8 | Acme | 6 ft. | 1 | 1:1 | 0.125" | Acme Class 2G | SAE Grade 2 | Rockwell B61 | 64,000 psi | ASTM A108 | 98935A031 | 00000 | ||
Alloy Steel | ||||||||||||||
| 1/2"-8 | Acme | 12" | 1 | 1:1 | 0.125" | Acme Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 psi | ASTM A193 | 93410A920 | 00000 | ||
| 1/2"-8 | Acme | 3 ft. | 1 | 1:1 | 0.125" | Acme Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 psi | ASTM A193 | 93410A611 | 00000 | ||
| 1/2"-8 | Acme | 6 ft. | 1 | 1:1 | 0.125" | Acme Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 psi | ASTM A193 | 93410A320 | 000000 | ||
18-8 Stainless Steel | ||||||||||||||
| 1/2"-8 | Acme | 12" | 1 | 1:1 | 0.125" | Acme Class 2G | — | Rockwell B96 | Not Rated | — | 95061A612 | 00000 | ||
| 1/2"-8 | Acme | 3 ft. | 1 | 1:1 | 0.125" | Acme Class 2G | — | Rockwell B96 | Not Rated | — | 95061A816 | 00000 | ||
| 1/2"-8 | Acme | 6 ft. | 1 | 1:1 | 0.125" | Acme Class 2G | — | Rockwell B96 | Not Rated | — | 95061A524 | 000000 | ||
Lead Screws—Left-Hand Thread
|
Carbon Steel—Carbon steel components are easier to machine than alloy steel components.
Alloy Steel—Alloy steel components are harder and stronger than carbon 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 | Lg., ft. | 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 | ||||||||||||||
| 1/2"-8 | Acme | 3 | 1 | 1:1 | 0.125" | Acme Class 2G | SAE Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 98935A417 | 000000 | ||
| 1/2"-8 | Acme | 6 | 1 | 1:1 | 0.125" | Acme Class 2G | SAE Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 98935A418 | 00000 | ||
Alloy Steel | ||||||||||||||
| 1/2"-8 | Acme | 3 | 1 | 1:1 | 0.125" | Acme Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 93410A419 | 00000 | ||
| 1/2"-8 | Acme | 6 | 1 | 1:1 | 0.125" | Acme Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 93410A420 | 000000 | ||
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.
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 | |||||||||||||
| 1/2"-8 | Acme | 31/64" | 7/8" | 1 | 1:1 | 0.125" | Acme Class 2G | Rockwell B75 | Not Rated | 94815A024 | 00000 | ||
Zinc-Plated Carbon Steel | |||||||||||||
| 1/2"-8 | Acme | 31/64" | 7/8" | 1 | 1:1 | 0.125" | Acme Class 2G | Rockwell B75 | Not Rated | 98948A115 | 00000 | ||
18-8 Stainless Steel | |||||||||||||
| 1/2"-8 | Acme | 31/64" | 7/8" | 1 | 1:1 | 0.125" | Acme Class 2G | Rockwell B97 | Not Rated | 95066A209 | 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 | ||||||||||||||
| 1/2"-8 | Acme | 31/64" | 7/8" | 1 | 1:1 | 0.125" | Acme Class 2G | SAE Grade 2 | Rockwell B85 | 64,000 psi | 91808A023 | 00000 | ||
18-8 Stainless Steel | ||||||||||||||
| 1/2"-8 | Acme | 31/64" | 7/8" | 1 | 1:1 | 0.125" | Acme Class 2G | — | Rockwell B97 | Not Rated | 95066A366 | 00000 | ||
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.
Lead Screws—Right-Hand Thread
 |
1018 Low-Carbon Steel—Carbon steel lead screws and flanges have good machinability.
Black-Oxide 4140 Alloy Steel—Black-oxide alloy steel lead screws are hard and strong. They have mild corrosion resistance.
304 Stainless Steel—304 stainless steel lead screws have good 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., ft. | Thread Type | Speed Ratio | No. of Thread Starts | Travel Distance per Turn | Accuracy for Travel Distance per Turn | Thread Fit | Hardness | Tensile Strength | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1018 Low-Carbon Steel | |||||||||||||
| 1/2"-8 | 3 | Acme | 2:1 | 2 | 0.25" | ±0.009"/1 ft. | Acme Class 2C | Brinell 126 | 64,000 psi | 99030A316 | 000000 | ||
| 1/2"-8 | 3 | Stub Acme | 8:1 | 8 | 1" | ±0.009"/1 ft. | Acme Class 2C | Brinell 126 | 64,000 psi | 99030A300 | 00000 | ||
| 1/2"-8 | 6 | Acme | 2:1 | 2 | 0.25" | ±0.009"/1 ft. | Acme Class 2C | Brinell 126 | 64,000 psi | 99030A716 | 00000 | ||
| 1/2"-8 | 6 | Stub Acme | 8:1 | 8 | 1" | ±0.009"/1 ft. | Acme Class 2C | Brinell 126 | 64,000 psi | 99030A400 | 00000 | ||
Black-Oxide 4140 Alloy Steel | |||||||||||||
| 1/2"-8 | 3 | Acme | 2:1 | 2 | 0.25" | ±0.009"/1 ft. | Acme Class 2C | Brinell 271 | 125,000 psi | 98940A623 | 00000 | ||
| 1/2"-8 | 6 | Acme | 2:1 | 2 | 0.25" | ±0.009"/1 ft. | Acme Class 2C | Brinell 271 | 125,000 psi | 98940A105 | 000000 | ||
304 Stainless Steel | |||||||||||||
| 1/2"-8 | 3 | Acme | 2:1 | 2 | 0.25" | ±0.009"/1 ft. | Acme Class 2C | Not Rated | Not Rated | 98980A978 | 00000 | ||
| 1/2"-8 | 3 | Stub Acme | 8:1 | 8 | 1" | ±0.009"/1 ft. | Acme Class 2C | Not Rated | Not Rated | 98980A979 | 000000 | ||
| 1/2"-8 | 6 | Acme | 2:1 | 2 | 0.25" | ±0.009"/1 ft. | Acme Class 2C | Brinell 150 | 72,000 psi | 98980A365 | 000000 | ||
| 1/2"-8 | 6 | Stub Acme | 8:1 | 8 | 1" | ±0.009"/1 ft. | Acme Class 2C | Brinell 150 | 72,000 psi | 98980A183 | 000000 | ||
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 | |||||||||||||||
| 1/2"-8 | 1" | 1.469" | Acme | 2:1 | 2 | 0.25" | Acme Class 2C | Brinell 217 | Not Rated | Not Rated | — | 95365A505 | 000000 | ||
932 Bearing Bronze | |||||||||||||||
| 1/2"-8 | 1" | 1.469" | Acme | 2:1 | 2 | 0.25" | Acme Class 2C | Brinell 65 | Not Rated | 1,300 lb. | — | 1343K15 | 00000 | ||
PET | |||||||||||||||
| 1/2"-8 | 1" | 1.469" | Acme | 2:1 | 2 | 0.25" | Acme Class 2C | Not Rated | Not Rated | 650 lb. | 15 to 175 | 1349K15 | 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 | |||||||||||||||||
| 1/2"-8 | 3/4" | 1.125" | Acme | 2:1 | 2 | 0.25" | 15/16"-16 | 1/2" | Acme Class 2C | Brinell 70 | Not Rated | Not Rated | — | 95072A130 | 000000 | ||
| 1/2"-8 | 3/4" | 1.125" | Stub Acme | 8:1 | 8 | 1" | 15/16"-16 | 1/2" | Acme Class 2C | Brinell 70 | Not Rated | Not Rated | — | 95072A420 | 00000 | ||
PET | |||||||||||||||||
| 1/2"-8 | 3/4" | 1.125" | Acme | 2:1 | 2 | 0.25" | 15/16"-16 | 1/2" | Acme Class 2C | Not Rated | Not Rated | 650 lb. | 15 to 175 | 95075A105 | 00000 | ||
Ultra-Precision Lead Screws and Nuts
 |
 |  |
Style B | Style C |
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.
Lead Screws—Right-Hand Thread
 |
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., ft. | Thread Type | Speed Ratio | No. of Thread Starts | Travel Distance per Turn | Accuracy for Travel Distance per Turn | Hardness | Tensile Strength, psi | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
303 Stainless Steel | ||||||||||||
| 1/2"-8 | 3 | Rounded Acme | 1:1 | 1 | 0.125" | ±0.0006"/1" | Brinell 160 | 90,000 | 6350K713 | 0000000 | ||
| 1/2"-8 | 6 | Rounded Acme | 1:1 | 1 | 0.125" | ±0.0006"/1" | Brinell 160 | 90,000 | 6350K125 | 000000 | ||
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 | 1/2"-8 | 1 1/2" | 0.75" | 1 1/2" | 3/16" | Rounded Acme | 1:1 | 1 1/8" | 1 | 0.125" | Not Rated | 9,700 | 150 | 3 | 6350K163 | 000000 | ||
Acetal with Wear-Compensating Spring | ||||||||||||||||||
| C | 1/2"-8 | 2" | 0.891" | 1 39/64" | 17/64" | Rounded Acme | 1:1 | 1 1/4" | 1 | 0.125" | Not Rated | 9,700 | 25 | 3 | 6350K201 | 00000 | ||
Fast-Travel Ultra-Precision Lead Screws and Nuts
 |  |  |
Style B | Style C |
Lead Screws—Right-Hand Thread
 |
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., ft. | Thread Type | Speed Ratio | No. of Thread Starts | Travel Distance per Turn | Accuracy for Travel Distance per Turn | Hardness | Tensile Strength, psi | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
303 Stainless Steel | ||||||||||||
| 1/2"-8 | 3 | Rounded Acme | 2:1 | 2 | 0.25" | ±0.0006"/1" | Brinell 160 | 90,000 | 6350K715 | 0000000 | ||
| 1/2"-8 | 3 | Rounded Acme | 4:1 | 4 | 0.5" | ±0.0006"/1" | Brinell 160 | 90,000 | 6350K716 | 000000 | ||
| 1/2"-8 | 3 | Rounded Acme | 8:1 | 8 | 1" | ±0.0006"/1" | Brinell 160 | 90,000 | 6350K717 | 000000 | ||
| 1/2"-8 | 6 | Rounded Acme | 2:1 | 2 | 0.25" | ±0.0006"/1" | Brinell 160 | 90,000 | 6350K115 | 000000 | ||
| 1/2"-8 | 6 | Rounded Acme | 4:1 | 4 | 0.5" | ±0.0006"/1" | Brinell 160 | 90,000 | 6350K23 | 000000 | ||
| 1/2"-8 | 6 | Rounded Acme | 8:1 | 8 | 1" | ±0.0006"/1" | Brinell 160 | 90,000 | 6350K24 | 000000 | ||
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 | 1/2"-8 | 1 1/2" | 0.75" | 1 1/2" | 3/16" | Rounded Acme | 2:1 | 1 1/8" | 2 | 0.25" | Not Rated | 9,700 | 150 | 3 | 6350K153 | 000000 | ||
| B | 1/2"-8 | 1 1/2" | 0.75" | 1 1/2" | 3/16" | Rounded Acme | 4:1 | 1 1/8" | 4 | 0.5" | Not Rated | 9,700 | 150 | 3 | 6350K43 | 00000 | ||
| B | 1/2"-8 | 1 1/2" | 0.75" | 1 1/2" | 3/16" | Rounded Acme | 8:1 | 1 1/8" | 8 | 1" | Not Rated | 9,700 | 150 | 3 | 6350K44 | 00000 | ||
Acetal with Wear-Compensating Spring | ||||||||||||||||||
| C | 1/2"-8 | 2" | 0.891" | 1 39/64" | 17/64" | Rounded Acme | 2:1 | 1 1/4" | 2 | 0.25" | Not Rated | 9,700 | 25 | 3 | 6350K191 | 00000 | ||
| C | 1/2"-8 | 2" | 0.891" | 1 39/64" | 17/64" | Rounded Acme | 4:1 | 1 1/4" | 4 | 0.5" | Not Rated | 9,700 | 25 | 3 | 6350K63 | 00000 | ||
| C | 1/2"-8 | 2" | 0.891" | 1 39/64" | 17/64" | Rounded Acme | 8:1 | 1 1/4" | 8 | 1" | Not Rated | 9,700 | 25 | 3 | 6350K64 | 00000 | ||
