Selecting Compatible Lead Screws and Nuts
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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.
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 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1/2"-4 | 1ft. | 2 | 0.5" | ±0.007" per ft. | 0.4" | Rockwell C56 | 58,000 | -65° to 300° | 00000000 | 000000 |
| 1/2"-4 | 2ft. | 2 | 0.5" | ±0.007" per ft. | 0.4" | Rockwell C56 | 58,000 | -65° 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 | Temperature Range, °F | Each | ||
Black-Oxide Alloy Steel | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| C | 1/2"-4 | 1 3/4" | 1 1/16" | 2 | 0.5" | 15/16"-16 | Rockwell C56 | 850 | 0.015" | -65° 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 | Temperature Range, °F | Each | ||
Black-Oxide Alloy Steel | ||||||||||||||
| F | 1/2"-4 | 1 29/32" | 1 1/16" | 2 19/32" | 17/32" | 2 | 0.5" | 2 3/32" | Rockwell C56 | 850 | 0.015" | -65° to 300° | 00000000 | 0000000 |
Fast-Travel Corrosion-Resistant Ball Screws and Nuts
Multiple thread channels (also known as thread starts) create faster linear travel than ball screws with a single thread start. 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. 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.
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 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1/2"-4 | 1 | 2 | 0.5" | ±0.005" per ft. | 0.4" | Rockwell C38 | 150,000 | -65° to 300° | 0000000 | 0000000 |
| 1/2"-4 | 2 | 2 | 0.5" | ±0.004" per ft. | 0.4" | Rockwell C38 | 145,000 | -65° to 300° | 000000 | 000000 |
| 1/2"-4 | 4 | 2 | 0.5" | ±0.004" per ft. | 0.4" | Rockwell C38 | 145,000 | -65° to 300° | 000000 | 000000 |
| 1/2"-4 | 6 | 2 | 0.5" | ±0.004" per ft. | 0.4" | 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 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2"-4 | 1 3/4" | 1 1/16" | 2 | 0.5" | 15/16"-16 | Rockwell C38 | 140 | 0.007" | -65° to 300° | 0000000 | 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 | |||||||||||||
| 1/2"-4 | 1 29/32" | 1 1/16" | 2 19/32" | 17/32" | 2 | 0.5" | 2 3/32" | Rockwell C38 | 140 | 0.007" | -65° to 300° | 0000000 | 0000000 |