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, thread size, and number of thread starts.
Carbon steel components are easier to machine than alloy steel components.
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 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 3/8"-4 | 3 1/4" | 1 7/8" | 1 | 1:1 | 0.25" | Class 2G | Rockwell B75 | 000000000 | 000000 |
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 3/8"-4 | 3 1/4" | 1 7/8" | 1 | 1:1 | 0.25" | Class 2G | Rockwell B75 | 000000000 | 000000 |
Multi-Slotted Shims
Use a single shim on feet or positioning arms that are secured with multiple fasteners. The slots let you insert, remove, and adjust the shims without disassembling your machinery. Shims are made of steel for good strength. Also known as finger shims.
For technical drawings and 3-D models, click on a part number.
Slot | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thick. | Thick. Tolerance | Lg. | Wd. | Wd. | Dp. | For Max. Screw Size | Material | Min. Hardness | Magnetic Properties | Pkg. Qty. | Pkg. | |
Inch | ||||||||||||
Three Slots | ||||||||||||
| 0.015" | -0.002" to 0.002" | 1" | 1 7/8" | 13/32" | 11/16" | 3/8" | 1008-1010 Carbon Steel | Rockwell B90 | Magnetic | 1 | 00000000 | 00000 |
| 0.032" | -0.002" to 0.002" | 1" | 1 7/8" | 13/32" | 11/16" | 3/8" | 1008-1010 Carbon Steel | Rockwell B90 | Magnetic | 1 | 00000000 | 0000 |
| 0.062" | -0.002" to 0.002" | 1" | 1 7/8" | 13/32" | 11/16" | 3/8" | 1008-1010 Carbon Steel | Rockwell B70 | Magnetic | 1 | 00000000 | 0000 |