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. Alloy steel components are harder and stronger than carbon steel components.
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 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2"-10 | 8 ft. | 1 | 1:1 | 0.1" | Class 2G | Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 000000000 | 000000 |
| 5/8"-8 | 8 ft. | 1 | 1:1 | 0.125" | Class 2G | Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 000000000 | 00000 |
| 3/4"-6 | 8 ft. | 1 | 1:1 | 0.167" | Class 2G | Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 000000000 | 00000 |
| 1"-5 | 8 ft. | 1 | 1:1 | 0.2" | Class 2G | Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 000000000 | 00000 |
| 1 1/2"-4 | 8 ft. | 1 | 1:1 | 0.25" | Class 2G | Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 000000000 | 000000 |
Alloy Steel | |||||||||||
| 1/2"-10 | 8 ft. | 1 | 1:1 | 0.1" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 000000 |
| 5/8"-8 | 8 ft. | 1 | 1:1 | 0.125" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 000000 |
| 3/4"-6 | 8 ft. | 1 | 1:1 | 0.167" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 000000 |
| 1"-5 | 8 ft. | 1 | 1:1 | 0.2" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 000000 |
| 1 1/4"-5 | 8 ft. | 1 | 1:1 | 0.2" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 000000 |
| 1 1/2"-4 | 8 ft. | 1 | 1:1 | 0.25" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 000000 |
Ball Screws and Nuts
Internal ball bearings provide smooth low-friction travel in applications that require high speeds, accurate positioning, and repeatable movement. Also known as single-start ball screws and nuts, they have a single thread that runs the length of the screw. They operate with more torque than fast-travel ball screws and nuts. To ensure compatibility, select components that have the same thread direction and 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.
Black-oxide alloy steel ball screws and nuts have mild corrosion resistance.
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. | No. of Thread Starts | Travel Distance per Turn | Accuracy for Travel Distance per Turn | Root Dia. | Hardness | Tensile Strength, psi | Temp. Range, °F | Each | |
Alloy Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1"-4 | 8 ft. | 1 | 0.25" | ±0.007" per ft. | 0.84" | Rockwell C56 | 122,000 | -65° to 300° | 00000000 | 0000000 |
| 1 1/2"-2 | 8 ft. | 1 | 0.5" | ±0.007" per ft. | 1.26" | Rockwell C56 | 183,500 | -65° to 300° | 00000000 | 000000 |
| 1 1/2"-4 | 8 ft. | 1 | 0.25" | ±0.007" per ft. | 1.375" | Rockwell C56 | 200,000 | -65° to 300° | 00000000 | 000000 |
Black-Oxide Alloy Steel | ||||||||||
| 2 1/4"-2 | 8 ft. | 1 | 0.5" | ±0.004" per ft. | 1.85" | Rockwell C58-62 | 120,000 | -65° to 300° | 00000000 | 00000000 |
Fast-Travel Ball Screws and Nuts
Multiple thread channels (also known as thread starts) create faster linear travel than ball screws with a single thread start. Internal ball bearings provide smooth low-friction travel in applications that require high speeds, accurate positioning, and repeatable movement. To ensure compatibility, select components that have the same thread size and number of thread starts. 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. | No. of Thread Starts | Travel Distance per Turn | Accuracy for Travel Distance per Turn | Root Dia. | Hardness | Tensile Strength, psi | Temperature Range, °F | Each | |
Alloy Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1"-4 | 8ft. | 2 | 0.5" | ±0.007" per ft. | 0.87" | Rockwell C56 | 126,500 | -65° to 300° | 00000000 | 0000000 |
| 1"-4 | 8ft. | 4 | 1" | ±0.007" per ft. | 0.84" | Rockwell C56 | 123,000 | -65° to 300° | 00000000 | 000000 |
| 1 1/2"-2 | 8ft. | 2 | 1" | ±0.007" per ft. | 1.14" | Rockwell C56 | 166,000 | -65° to 300° | 00000000 | 000000 |