Selecting Compatible Lead Screws and Nuts
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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 1/2"-2 | 2 ft. | 1 | 0.5" | ±0.004" per ft. | 1.265" | Rockwell C56 | 85,000 | -40° to 300° | 00000000 | 0000000 |
| 1 1/2"-2 | 3 ft. | 1 | 0.5" | ±0.004" per ft. | 1.265" | Rockwell C56 | 85,000 | -40° to 300° | 00000000 | 000000 |
| 1 1/2"-2 | 4 ft. | 1 | 0.5" | ±0.004" per ft. | 1.265" | Rockwell C56 | 85,000 | -40° to 300° | 00000000 | 000000 |
| 1 1/2"-2 | 5 ft. | 1 | 0.5" | ±0.004" per ft. | 1.265" | Rockwell C56 | 85,000 | -40° to 300° | 00000000 | 000000 |
| 1 1/2"-2 | 6 ft. | 1 | 0.5" | ±0.004" per ft. | 1.265" | Rockwell C56 | 85,000 | -40° to 300° | 00000000 | 000000 |
| 1 1/2"-2 | 7 ft. | 1 | 0.5" | ±0.004" per ft. | 1.265" | Rockwell C56 | 85,000 | -40° to 300° | 00000000 | 000000 |
| 1 1/2"-2 | 8 ft. | 1 | 0.5" | ±0.004" per ft. | 1.265" | Rockwell C56 | 85,000 | -40° to 300° | 00000000 | 00000000 |
| Thread Size | Lg. | Dia. | No. of Thread Starts | Travel Distance per Turn | External Thread Size | Hardness | Dynamic Thrust Load Cap., lbs. | Max. Backlash | Temp. Range, °F | Each | ||
Black-Oxide Alloy Steel | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A | 1 1/2"-2 | 5 19/32" | 2 5/8" | 1 | 0.5" | 2.360"-18 | Rockwell C56 | 14,500 | 0.015" | -40° to 300° | 00000000 | 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 | Each | ||
Black-Oxide Alloy Steel | |||||||||||||
| D | 1 1/2"-2 | 5 19/32" | 2 5/8" | 4 21/32" | 25/32" | 1 | 0.5" | 3 7/8" | Rockwell C56 | 14,500 | 0.015" | 00000000 | 0000000 |
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.
Black-oxide alloy steel ball 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 | Temperature Range, °F | Each | |
Alloy Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 1/2"-2 | 2ft. | 2 | 1" | ±0.004" per ft. | 1.143" | Rockwell C56 | 85,000 | -40° to 300° | 00000000 | 0000000 |
| 1 1/2"-2 | 3ft. | 2 | 1" | ±0.004" per ft. | 1.143" | Rockwell C56 | 85,000 | -40° to 300° | 00000000 | 000000 |
| 1 1/2"-2 | 4ft. | 2 | 1" | ±0.004" per ft. | 1.143" | Rockwell C56 | 85,000 | -40° to 300° | 00000000 | 000000 |
| 1 1/2"-2 | 5ft. | 2 | 1" | ±0.004" per ft. | 1.143" | Rockwell C56 | 85,000 | -40° to 300° | 00000000 | 000000 |
| 1 1/2"-2 | 6ft. | 2 | 1" | ±0.004" per ft. | 1.143" | Rockwell C56 | 85,000 | -40° to 300° | 00000000 | 000000 |
| 1 1/2"-2 | 7ft. | 2 | 1" | ±0.004" per ft. | 1.143" | Rockwell C56 | 85,000 | -40° to 300° | 00000000 | 000000 |
| 1 1/2"-2 | 8ft. | 2 | 1" | ±0.004" per ft. | 1.143" | Rockwell C56 | 85,000 | -40° to 300° | 00000000 | 00000000 |
Secure a way wiper on the end of a ball nut to sweep chips and other contaminants out of the way as it moves across the ball screw.
Secure a way wiper on the end of a ball nut to sweep chips and other contaminants out of the way as it moves across the ball screw.
Ball Nuts | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Flange | Way Wipers | |||||||||||||||
| 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 | Each | |||
Black-Oxide Alloy Steel | ||||||||||||||||
| F | 1 1/2"-2 | 3 5/8" | 2 5/8" | 4 15/16" | 1 1/64" | 2 | 1" | 4 1/8" | Rockwell C56 | 8,200 | 0.015" | -40° to 300° | 00000000 | 0000000 | 0000000 | 0000000 |