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 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 3/8"-8 | 1 ft. | 1 | 0.125" | ±0.004" per ft. | 0.31" | Rockwell C56 | 85,000 | -40° to 300° | 00000000 | 000000 |
| 3/8"-8 | 2 ft. | 1 | 0.125" | ±0.004" per ft. | 0.31" | Rockwell C56 | 85,000 | -40° to 300° | 00000000 | 000000 |
| 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 | 3/8"-8 | 1 11/64" | 3/4" | 1 | 0.125" | 11/16"-28 | Rockwell C56 | 150 | 0.015" | -40° to 300° | 00000000 | 000000 |
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 | 3/8"-8 | 1" | 3/4" | 1 39/64" | 11/32" | 1 | 0.125" | 1 15/64" | Rockwell C56 | 130 | 0.015" | 00000000 | 0000000 |
Corrosion-Resistant Ball Screws and Nuts
Suitable for use in harsh environments, these ball screws and nuts are made of stainless steel. 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 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 | Accuracy for Travel Distance per Turn | Root Dia. | Hardness | Tensile Strength, psi | Temperature Range, °F | Each | |
17-4 PH Stainless Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 3/8"-8 | 1 | 1 | 0.125" | ±0.005" per ft. | 0.3" | Rockwell C38 | 150,000 | -65° to 300° | 0000000 | 0000000 |
| 3/8"-8 | 2 | 1 | 0.125" | ±0.004" per ft. | 0.3" | Rockwell C38 | 145,000 | -65° to 300° | 000000 | 000000 |
| 3/8"-8 | 4 | 1 | 0.125" | ±0.004" per ft. | 0.3" | Rockwell C38 | 145,000 | -65° to 300° | 000000 | 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 | ||
17-4 PH Stainless Steel | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A | 3/8"-8 | 1" | 3/4" | 1 | 0.125" | 0.664"-32 | Rockwell C38 | 25 | 0.007" | -65° to 300° | 000000 | 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 | ||
17-4 PH Stainless Steel | ||||||||||||||
| C | 3/8"-8 | 1" | 3/4" | 1 19/32" | 17/64" | 1 | 0.125" | 1 15/64" | Rockwell C38 | 25 | 0.007" | -65° to 300° | 0000000 | 0000000 |