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.
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 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 5/8"-6 | 12" | 1 | 1:1 | 0.167" | Class 2G | Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 000000000 | 00000 |
| 5/8"-6 | 3 ft. | 1 | 1:1 | 0.167" | Class 2G | Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 000000000 | 00000 |
| 5/8"-6 | 6 ft. | 1 | 1:1 | 0.167" | Class 2G | Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 000000000 | 00000 |
Alloy Steel | |||||||||||
| 5/8"-6 | 12" | 1 | 1:1 | 0.167" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 00000 |
| 5/8"-6 | 3 ft. | 1 | 1:1 | 0.167" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 00000 |
| 5/8"-6 | 6 ft. | 1 | 1:1 | 0.167" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 000000 |
18-8 Stainless Steel | |||||||||||
| 5/8"-6 | 12" | 1 | 1:1 | 0.167" | Class 2G | __ | Rockwell B96 | Not Rated | __ | 000000000 | 00000 |
| 5/8"-6 | 3 ft. | 1 | 1:1 | 0.167" | Class 2G | __ | Rockwell B96 | Not Rated | __ | 000000000 | 00000 |
| 5/8"-6 | 6 ft. | 1 | 1:1 | 0.167" | 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 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 5/8"-6 | 3 ft. | 1 | 1:1 | 0.167" | Class 2G | Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 000000000 | 000000 |
| 5/8"-6 | 6 ft. | 1 | 1:1 | 0.167" | Class 2G | Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 000000000 | 00000 |
Alloy Steel | |||||||||||
| 5/8"-6 | 3 ft. | 1 | 1:1 | 0.167" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 000000 |
| 5/8"-6 | 6 ft. | 1 | 1:1 | 0.167" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 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 | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 5/8"-6 | 39/64" | 1 1/16" | 1 | 1:1 | 0.167" | Class 2G | Rockwell B75 | 000000000 | 00000 |
Zinc-Plated Carbon Steel | |||||||||
| 5/8"-6 | 39/64" | 1 1/16" | 1 | 1:1 | 0.167" | Class 2G | Rockwell B75 | 000000000 | 00000 |
18-8 Stainless Steel | |||||||||
| 5/8"-6 | 39/64" | 1 1/16" | 1 | 1:1 | 0.167" | Class 2G | Rockwell B97 | 000000000 | 00000 |
Hex nuts fasten and position lead screw components.
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.
For technical drawings and 3-D models, click on a part number.
| 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 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 5/8"-6 | 3ft. | 12 | Rounded Acme | 12:1 | 2" | ±0.0006" per in. | Brinell 160 | 90,000 | 00000000 | 0000000 |
| 5/8"-6 | 6ft. | 12 | Rounded Acme | 12:1 | 2" | ±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 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 | 5/8"-6 | 1 1/2" | 0.875" | 1 1/2" | 3/16" | 12 | Rounded Acme | 12:1 | 2" | 1 3/16" | 9,700 | 220 | 00000000 | 000000 |
Acetal Plastic with Wear-Compensating Spring | ||||||||||||||
| C | 5/8"-6 | 2" | 1.063" | 1 51/64" | 17/64" | 12 | Rounded Acme | 12:1 | 2" | 1 3/8" | 9,700 | 35 | 00000000 | 00000 |
Self-Stopping Ball Screws and Nuts
Keep your ball screw spinning without the ball nut damaging your system—a clutch-like collar inside the ball nut prevents it from travelling past the stop pins. Install the included stop pins anywhere along the length of the ball screw by drilling a hole in the valley of the threads (also known as the root) and pressing in the stop pin. When the collar meets the stop pin, the ball nut disengages from the threads and begins to idle. To start the ball nut travelling again, spin the ball screw in the opposite direction. All components are black-oxide steel and have mild corrosion resistance. To ensure compatibility, select components that have the same thread size. Ball nuts are furnished with a tube to keep ball bearings in place. Do not remove the tube until you are ready to install the nuts onto the screws.
Travel distance per turn, also known as screw lead, is the distance a ball nut moves with one revolution of the ball screw.
For technical drawings and 3-D models, click on a part number.
Root diameter indicates the diameter the ball screw will be after machining away the threads.
| Thread Size | Lg., ft. | No. of Thread Starts | Travel Distance per Turn | Root Dia. | Hardness | Tensile Strength, psi | Temperature Range, °F | No. of Pins Included | Each | |
Black-Oxide Alloy Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 5/8"-6 | 1 | 2 | 0.188" | 0.562" | Rockwell C56 | 95,000 | -65° to 300° | 2 | 0000000 | 0000000 |
| 5/8"-6 | 2 | 2 | 0.188" | 0.562" | Rockwell C56 | 95,000 | -65° to 300° | 2 | 0000000 | 000000 |
| 5/8"-6 | 3 | 2 | 0.188" | 0.562" | Rockwell C56 | 95,000 | -65° to 300° | 2 | 0000000 | 000000 |
| Thread Size | Lg. | Dia. | No. of Thread Starts | Travel Distance per Turn | External Thread Size | Hardness | Dynamic Thrust Load Cap., lbs. | Max. Backlash | Temperature Range, °F | Each | |
Black-Oxide Alloy Steel | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 5/8"-6 | 1 7/8" | 1" | 2 | 0.188" | 15/16"-16 | Rockwell C56 | 300 | 0.006" | -65° to 300° | 0000000 | 0000000 |
Flange | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Lg. | Dia. | Dia. | Thick. | No. of Thread Starts | Travel Distance per Turn | Bolt Circle Dia. | Hardness | Dynamic Thrust Load Cap., lbs. | Max. Backlash | Temperature Range, °F | Each | |
Black-Oxide Alloy Steel | |||||||||||||
| 5/8"-6 | 1 7/8" | 1" | 2" | 13/32" | 2 | 0.188" | 1 5/8" | Rockwell C56 | 300 | 0.006" | -65° to 300° | 0000000 | 0000000 |