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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Selecting Compatible Lead Screws and Nuts
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Acme Lead Screws and Nuts
Found in hand-powered clamps, vises, grates, doors, and work tables, lead screws and nuts have broad, square threads that are well suited for quick assembly, high clamping forces, and lifting and lowering heavy objects. To ensure compatibility, please select components that have the same thread direction and size.
Carbon steel components are easier to machine than alloy steel components. 18-8 stainless steel components have good corrosion resistance.
Travel distance per turn, also known as screw lead, is the distance a nut or handle moves with one revolution of the lead screw.
For technical drawings and 3-D models, click on a part number.
Coupling Nuts—Right-Hand Threaded
Coupling nuts connect two lead screws.
| Thread Size | Ht. | Wd. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Each | |
Carbon Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 3/8"-12 | 1 7/8" | 1/2" | 1 | 1:1 | 0.083" | Class 2G | Rockwell B75 | 000000000 | 000000 |
| 1/2"-10 | 1 1/4" | 5/8" | 1 | 1:1 | 0.1" | Class 2G | Rockwell B75 | 000000000 | 00000 |
| 5/8"-8 | 2 1/8" | 7/8" | 1 | 1:1 | 0.125" | Class 2G | Rockwell B75 | 000000000 | 00000 |
| 3/4"-5 | 2 1/4" | 1" | 1 | 1:1 | 0.2" | Class 2G | Rockwell B75 | 000000000 | 00000 |
| 3/4"-6 | 2 1/4" | 1" | 1 | 1:1 | 0.167" | Class 2G | Rockwell B75 | 000000000 | 00000 |
| 7/8"-6 | 2 1/2" | 1 1/4" | 1 | 1:1 | 0.167" | Class 2G | Rockwell B75 | 000000000 | 00000 |
| 1"-5 | 2 3/4" | 1 3/8" | 1 | 1:1 | 0.2" | Class 2G | Rockwell B75 | 000000000 | 00000 |
| 1"-6 | 2 3/4" | 1 3/8" | 1 | 1:1 | 0.167" | Class 2G | Rockwell B75 | 000000000 | 00000 |
| 1"-10 | 2 3/4" | 1 3/8" | 1 | 1:1 | 0.1" | Class 2G | Rockwell B75 | 000000000 | 00000 |
| 1 1/8"-5 | 3" | 1 1/2" | 1 | 1:1 | 0.2" | Class 2G | Rockwell B75 | 000000000 | 00000 |
| 1 1/4"-4 | 3" | 1 5/8" | 1 | 1:1 | 0.25" | Class 2G | Rockwell B75 | 000000000 | 00000 |
| 1 1/4"-5 | 3" | 1 5/8" | 1 | 1:1 | 0.2" | Class 2G | Rockwell B75 | 000000000 | 00000 |
| 1 3/8"-4 | 3 1/4" | 1 7/8" | 1 | 1:1 | 0.25" | Class 2G | Rockwell B75 | 000000000 | 00000 |
| 1 1/2"-4 | 3 1/2" | 2" | 1 | 1:1 | 0.25" | Class 2G | Rockwell B75 | 000000000 | 00000 |
| 2"-4 | 4" | 3" | 1 | 1:1 | 0.25" | Class 2G | Rockwell B75 | 000000000 | 000000 |
| 2 1/2"-4 | 5" | 3 1/2" | 1 | 1:1 | 0.25" | Class 2G | Rockwell B75 | 000000000 | 000000 |
18-8 Stainless Steel | |||||||||
| 1/2"-10 | 1 1/4" | 5/8" | 1 | 1:1 | 0.1" | Class 2G | Not Rated | 000000000 | 00000 |
| 5/8"-8 | 2 1/8" | 7/8" | 1 | 1:1 | 0.125" | Class 2G | Not Rated | 000000000 | 00000 |
| 3/4"-5 | 2 1/4" | 1" | 1 | 1:1 | 0.2" | Class 2G | Not Rated | 000000000 | 00000 |
| 3/4"-6 | 2 1/4" | 1" | 1 | 1:1 | 0.167" | Class 2G | Not Rated | 000000000 | 00000 |
| 7/8"-6 | 2 1/2" | 1 1/4" | 1 | 1:1 | 0.167" | Class 2G | Not Rated | 000000000 | 00000 |
| 1"-5 | 2 3/4" | 1 3/8" | 1 | 1:1 | 0.2" | Class 2G | Not Rated | 000000000 | 00000 |
| 1"-6 | 2 3/4" | 1 3/8" | 1 | 1:1 | 0.167" | Class 2G | Not Rated | 000000000 | 00000 |
| 1"-10 | 2 3/4" | 1 3/8" | 1 | 1:1 | 0.1" | Class 2G | Not Rated | 000000000 | 00000 |
| 1 1/8"-5 | 3" | 1 1/2" | 1 | 1:1 | 0.2" | Class 2G | Not Rated | 000000000 | 00000 |
| 1 1/4"-4 | 3" | 1 5/8" | 1 | 1:1 | 0.25" | Class 2G | Not Rated | 000000000 | 000000 |
| 1 1/4"-5 | 3" | 1 5/8" | 1 | 1:1 | 0.2" | Class 2G | Not Rated | 000000000 | 000000 |
| 1 1/2"-4 | 3 1/2" | 2" | 1 | 1:1 | 0.25" | Class 2G | Not Rated | 000000000 | 000000 |
| 2"-4 | 4" | 3" | 1 | 1:1 | 0.25" | Class 2G | Not Rated | 000000000 | 000000 |
Coupling Nuts—Left-Hand Threaded
Coupling nuts connect two lead screws.
| Thread Size | Ht. | Wd. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Each | |
Carbon Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1/2"-10 | 1 1/4" | 5/8" | 1 | 1:1 | 0.1" | Class 2G | Rockwell B75 | 000000000 | 000000 |
| 5/8"-8 | 2 1/8" | 7/8" | 1 | 1:1 | 0.125" | Class 2G | Rockwell B75 | 000000000 | 00000 |
| 3/4"-5 | 2 1/4" | 1" | 1 | 1:1 | 0.2" | Class 2G | Rockwell B75 | 000000000 | 00000 |
| 3/4"-6 | 2 1/4" | 1" | 1 | 1:1 | 0.167" | Class 2G | Rockwell B75 | 000000000 | 00000 |
| 7/8"-6 | 2 1/2" | 1 1/4" | 1 | 1:1 | 0.167" | Class 2G | Rockwell B75 | 000000000 | 00000 |
| 1"-5 | 2 3/4" | 1 3/8" | 1 | 1:1 | 0.2" | Class 2G | Rockwell B75 | 000000000 | 00000 |
| 1"-6 | 2 3/4" | 1 3/8" | 1 | 1:1 | 0.167" | Class 2G | Rockwell B75 | 000000000 | 00000 |
| 1"-10 | 2 3/4" | 1 3/8" | 1 | 1:1 | 0.1" | Class 2G | Rockwell B75 | 000000000 | 00000 |
| 1 1/8"-5 | 3" | 1 1/2" | 1 | 1:1 | 0.2" | Class 2G | Rockwell B75 | 000000000 | 00000 |
| 1 1/4"-4 | 3" | 1 5/8" | 1 | 1:1 | 0.25" | Class 2G | Rockwell B75 | 000000000 | 00000 |
| 1 1/4"-5 | 3" | 1 5/8" | 1 | 1:1 | 0.2" | Class 2G | Rockwell B75 | 000000000 | 00000 |
| 1 3/8"-4 | 3 1/4" | 1 7/8" | 1 | 1:1 | 0.25" | Class 2G | Rockwell B75 | 000000000 | 00000 |
| 1 1/2"-4 | 3 1/2" | 2" | 1 | 1:1 | 0.25" | Class 2G | Rockwell B75 | 000000000 | 00000 |
| 2"-4 | 4" | 3" | 1 | 1:1 | 0.25" | Class 2G | Rockwell B75 | 000000000 | 000000 |