System of Measurement System of Measurement |
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Thread Size Thread Size | Show |
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Thread Size Thread Size | Hide |
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Thread Type Thread Type |
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Component Component |
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 | Ball Nut |
 | Ball Screw |
 | Lead Screw |
 | Nut |
Nut Type Nut Type |
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Thread Direction Thread Direction |
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 | Right Hand |
Tensile Strength Tensile Strength |
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Number of Thread Starts Number of Thread Starts |
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Hardness Hardness |
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Dynamic Thrust Load Capacity Dynamic ThrustLoad Capacity |
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Threading Threading |
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 | Fully Threaded |
Thread Fit Thread Fit |
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Speed Ratio Speed Ratio |
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Maximum Temperature Maximum Temperature |
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Minimum Temperature Minimum Temperature |
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Number of Mounting Holes Number of Mounting Holes |
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Selecting Compatible Lead Screws and Nuts
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About Shaft Collars
Shaft collars are useful for holding and positioning components on a shaft. They can also serve as mechanical stops and stroke limiters.
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About Washers
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Metric Precision Acme Lead Screws and Nuts
Pair with a motor in automated motion and positioning applications. A tight thread fit allows these lead screws and nuts to make accurate, repeatable starts and stops. Also known as single-start and self-locking lead screws and nuts, they have a single thread that runs the length of the screw. The nut travels only when the screw turns, so your system won’t unexpectedly move when the lead screw is at rest. To ensure compatibility, select components that have the same thread size.
Lead screws are 1018 carbon steel for good machinability.
932 bearing bronze nuts have good machinability and wear resistance. Manganese bronze nuts have good strength and wear resistance.
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 | Thread Pitch, mm | Lg., mm | No. of Thread Starts | Speed Ratio | Travel Distance per Turn, mm | Accuracy for Travel Distance per Turn | Thread Fit | Hardness | Tensile Strength, psi | Specifications Met | Each | |
1018 Carbon Steel | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M28 | 5 | 1,000 | 1 | 1:1 | 5 | ±0.15 mm per 300 mm | Class 8E | Brinell 150 | 85,000 | DIN 103 | 0000000 | 000000 |
| M28 | 5 | 1,750 | 1 | 1:1 | 5 | ±0.15 mm per 300 mm | Class 8E | Brinell 150 | 85,000 | DIN 103 | 0000000 | 000000 |
| Thread Size | Thread Pitch, mm | Lg. | Dia. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn, mm | Thread Fit | Hardness | Tensile Strength, psi | Dynamic Thrust Load Cap., lbs. | Specifications Met | Each | |
932 Bearing Bronze | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M28 | 5 | 2" | 1.75" | 1 | 1:1 | 5 | Class 8E | Brinell 69 | 44,000 | 6,100 | DIN 103 | 0000000 | 000000 |
External Thread | |||||||||||||||
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| Thread Size | Thread Pitch, mm | Lg. | Dia. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn, mm | Size | Lg. | Thread Fit | Hardness | Tensile Strength, psi | Dynamic Thrust Load Cap., lbs. | Specifications Met | Each | |
Manganese Bronze | |||||||||||||||
| M28 | 5 | 1 3/4" | 2.125" | 1 | 1:1 | 5 | 1 31/32"-18 | 13/16" | Class 8E | Brinell 126 | 75,000 | 6,100 | DIN 103 | 0000000 | 0000000 |
Flange | ||||||||||||||||
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| Thread Size | Thread Pitch, mm | Lg. | Dia. | Dia. | Thick. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn, mm | Bolt Circle Dia. | Thread Fit | Hardness | Tensile Strength, psi | Dynamic Thrust Load Cap., lbs. | Specifications Met | Each | |
Manganese Bronze | ||||||||||||||||
| M28 | 5 | 1 3/4" | 2.125" | 4 13/64" | 53/64" | 1 | 1:1 | 5 | 3 7/16" | Class 8E | Brinell 126 | 75,000 | 6,100 | DIN 103 | 0000000 | 0000000 |
Metric 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, these 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 and pitch. 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 | Thread Pitch, mm | Lg., mm | No. of Thread Starts | Travel Distance per Turn, mm | Accuracy for Travel Distance per Turn | Root Dia., mm | Hardness | Temperature Range, °F | Each | |
Carbon Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| M28 | 6 | 500 | 1 | 6 | ±0.210 mm per 300 mm | 25.2 | Rockwell C58 | Not Rated to 175° | 00000000 | 0000000 |
| M28 | 6 | 1,000 | 1 | 6 | ±0.210 mm per 300 mm | 25.2 | Rockwell C58 | Not Rated to 175° | 00000000 | 000000 |
| M28 | 6 | 2,000 | 1 | 6 | ±0.210 mm per 300 mm | 25.2 | Rockwell C58 | Not Rated to 175° | 00000000 | 000000 |
| M28 | 6 | 2,500 | 1 | 6 | ±0.210 mm per 300 mm | 25.2 | Rockwell C58 | Not Rated to 175° | 00000000 | 000000 |
| Thread Size | Thread Pitch, mm | Lg., mm | Wd., mm | Ht., mm | Center Ht., mm | No. of Thread Starts | Travel Distance per Turn, mm | Hardness | Dynamic Thrust Load Cap., lbs. | Max. Backlash, mm | Includes | Temperature Range, °F | Each | |
Alloy Steel | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M28 | 6 | 42 | 60 | 50 | 22 | 1 | 6 | Rockwell C58 | 1,570 | 0.1 | Seals | Not Rated to 175° | 00000000 | 0000000 |
| M28 | 6 | 67 | 60 | 50 | 22 | 1 | 6 | Rockwell C58 | 2,870 | 0.1 | Seals | Not Rated to 175° | 00000000 | 000000 |
Flange | ||||||||||||||
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| Thread Size | Thread Pitch, mm | Lg., mm | Dia., mm | Dia., mm | Thick., mm | No. of Thread Starts | Travel Distance per Turn, mm | Hardness | Dynamic Thrust Load Cap., lbs. | Max. Backlash, mm | Includes | Temperature Range, °F | Each | |
Alloy Steel | ||||||||||||||
| M28 | 6 | 47 | 50 | 80 | 12 | 1 | 6 | Rockwell C58 | 1,570 | 0.1 | Seals | Not Rated° to 175° | 00000000 | 0000000 |
| M28 | 6 | 65 | 50 | 80 | 12 | 1 | 6 | Rockwell C58 | 2,870 | 0.1 | Seals | Not Rated° to 175° | 00000000 | 000000 |
Bearing Retaining Locknuts
With a nylon insert that grips your threaded shaft or spindle without damaging the threads, these locknuts—sometimes called shaft nuts—keep bearings, bushings, gears, and pulleys in place. They won’t shake loose from vibration. However, their nylon insert also means you shouldn’t use these locknuts in applications with high temperatures. Their sides are slotted, so you can tighten and loosen them with a spanner wrench. To reduce the total size and weight of your assembly, they have chamfered edges.
All meet international standards for bearing locknut dimensions.
Carbon steel locknuts are strong and wear resistant. Zinc-plated steel locknuts have an outer layer of zinc that prevents the steel from rusting in wet areas. Compared to stainless steel, they're stronger, more wear resistant, and less costly, but not as corrosion resistant. Avoid exposing them to salt water and chemicals.
When choosing your thread spacing, consider the precision of your application. The finer the threads, the more control you have when making adjustments.
For technical drawings and 3-D models, click on a part number.
Thread | Zinc-Plated Carbon Steel | |||||||
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| Size | Pitch, mm | Spacing | OD, mm | Wd., mm | Insert Max. Temp., °F | Specifications Met | Each | |
Chamfered Face | ||||||||
| M28 | 1.5 | Extra Fine | 44 | 11 | 210° | DIN 1805 | 0000000 | 000000 |
Bearing Retaining Jam Nuts
Used in pairs or with another bearing retaining nut, these jam nuts—often called shaft nuts—hold bearings, bushings, pulleys, and gears in place on your threaded shaft or spindle. Threading two nuts tightly against each other makes it harder for vibration to loosen your assembly than if you used only one nut. For the nut closer to the bearing, position the stepped face towards the bearing. These jam nuts have holes on the side, so you can tighten and loosen them with a pin spanner wrench. Made of carbon steel, they’re strong and wear resistant. All meet DIN 1816, an international standard for bearing locknut dimensions.
For technical drawings and 3-D models, click on a part number.
Thread | |||||||
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| Size | Pitch, mm | Spacing | OD, mm | Wd., mm | Specifications Met | Each | |
Carbon Steel | |||||||
Stepped Face | |||||||
| M28 | 1.5 | Extra Fine | 50 | 10 | DIN 1816 | 0000000 | 000000 |
Bearing Retaining Nuts
Often paired with spring lock washers to strengthen their hold, these retaining nuts—also known as shaft nuts—keep vibration from shifting bearings, bushings, pulleys, and gears on your threaded shaft or spindle. They have slotted sides, so you can tighten and loosen them with a spanner wrench. Made of carbon steel, they’re strong and wear resistant.
Use stepped-face retaining nuts with DIN 462 spring lock washers. You can also use them in pairs or with other bearing retaining nuts as jam nuts. For the nut closer to the bearing, position the stepped face towards the bearing. All meet DIN standards for bearing lockout dimensions.
For technical drawings and 3-D models, click on a part number.