About Set Screws
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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.
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.
Ball Screw | Flange Ball Nut | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size  | Lg., mm | Root Dia., mm | Tensile Strength, psi | Lg., mm | Dia., mm | Length Tolerance | No. of Thread Starts | Travel Distance per Turn, mm | Accuracy for Travel Distance per Turn | Hardness | Dynamic Thrust Load Capacity, lbs. | Max. Backlash, mm | Temp. Range, °F | Each | |
Carbon Steel Ball Screw with Alloy Steel Flange Ball Nut | |||||||||||||||
| M8 | 150 | 6.6 | 21,000 | 28 | 20 | Plus | 1 | 2 | ±0.210 mm per 300 mm | Rockwell C58 | 470 | 0.05 | 5° to 175° | 0000000 | 0000000 |
| M8 | 250 | 6.6 | 21,000 | 28 | 20 | Plus | 1 | 2 | ±0.210 mm per 300 mm | Rockwell C58 | 470 | 0.05 | 5° to 175° | 000000 | 000000 |
Metric Alloy Steel Low-Profile Swivel-Tip Set Screws
A low-profile flat-faced ball tip allows these set screw to be used in low-clearance applications. They're also known as ball-ended thrust screws. Length listed is the overall length.
For technical drawings and 3-D models, click on a part number.
Swiveling Tips for Screws and Threaded Studs
Attach to the end of a screw or threaded stud to apply uniform pressure on uneven and angled surfaces. Also known as toggle and swivel-foot pads.
For technical drawings and 3-D models, click on a part number.
| Dia. | Ht. | Load Capacity, lbs. | Thread Size | Range of Motion | Each | |
Steel | ||||||
|---|---|---|---|---|---|---|
| 16mm | 21mm | 930 | M8 | 20° | 0000000 | 000000 |