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. Zinc-plated carbon steel components have mild corrosion resistance. Alloy steel components are harder and stronger than carbon 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.
| Thread Type | Thread Size  | Lg. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Fastener Strength Grade/Class | Hardness | Tensile Strength, psi | Specifications Met | Each | |
Carbon Steel | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Acme | 1 3/8"-4 | 12" | 1 | 1:1 | 0.25" | Class 2G | Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 000000000 | 000000 |
| Acme | 1 3/8"-4 | 3 ft. | 1 | 1:1 | 0.25" | Class 2G | Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 000000000 | 00000 |
| Acme | 1 3/8"-4 | 6 ft. | 1 | 1:1 | 0.25" | Class 2G | Grade 2 | Rockwell B61 | 53,000 | ASTM A108 | 000000000 | 000000 |
Alloy Steel | ||||||||||||
| Acme | 1 3/8"-4 | 3 ft. | 1 | 1:1 | 0.25" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 000000 |
| Acme | 1 3/8"-4 | 6 ft. | 1 | 1:1 | 0.25" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 000000 |
| Thread Type | Thread Size | Lg. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Fastener Strength Grade/Class | Hardness | Tensile Strength, psi | Specifications Met | Each | |
Carbon Steel | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Acme | 1 3/8"-4 | 3 ft. | 1 | 1:1 | 0.25" | Class 2G | Grade 2 | Rockwell B61 | 53,000 | ASTM A108 | 000000000 | 000000 |
| Acme | 1 3/8"-4 | 6 ft. | 1 | 1:1 | 0.25" | Class 2G | Grade 2 | Rockwell B61 | 53,000 | ASTM A108 | 000000000 | 000000 |
Alloy Steel | ||||||||||||
| Acme | 1 3/8"-4 | 3 ft. | 1 | 1:1 | 0.25" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 000000 |
| Acme | 1 3/8"-4 | 6 ft. | 1 | 1:1 | 0.25" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 000000 |
Coupling nuts connect two lead screws.
| Thread Type | Thread Size | Ht. | Wd. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Each | |
Carbon Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Acme | 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 Type | Thread Size | Ht. | Wd. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Each | |
Carbon Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Acme | 1 3/8"-4 | 3 1/4" | 1 7/8" | 1 | 1:1 | 0.25" | Class 2G | Rockwell B75 | 000000000 | 000000 |
Hex nuts fasten and position lead screw components.
Hex nuts fasten and position lead screw components.
| Thread Type | Thread Size | Ht. | Wd. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Fastener Strength Grade/Class | Hardness | Each | |
Carbon Steel | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Acme | 1 3/8"-4 | 1 11/32" | 2 3/16" | 1 | 1:1 | 0.25" | Class 2G | Grade 2 | Rockwell B85 | 000000000 | 000000 |
Scaffold Leveling Jacks
Swap these jacks with the base plates on your scaffold to create a level foundation on uneven ground. They adjust in increments less than an inch, so you can set each leg of your scaffold to the exact height you need. Made from galvanized steel, these jacks resist rust and hold up to outdoor use. For safety and stability, the top 6" of the threaded stud slides into the scaffold frame and isn’t usable.
Hollow jacks are lighter in weight than solid jacks, so they’re easier to handle.
Note: Leveling jacks meet OSHA and Cal/OSHA dimensional and construction standards. Check local, state, and federal codes, including OSHA, for safe set up and operating practices.
Overall | Base | Thread | Base Mount | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cap., lbs. | Max. Lift | Ht. | Wd. | Lg. | Wd. | For ID | Material | Size | Lg. | Fasteners Included | No. of Holes | Hole Dia. | Hole Ctr.-to-Ctr. | Weight, lbs. | Specifications Met | Each | |
Hollow | |||||||||||||||||
| 5,300 | 18" | 24" | 9 3/8" | 5 5/16" | 5 5/16" | 1 1/2" | Galvanized Steel | 1 3/8"-4 | 16 9/16" | No | 4 | 1/2" | 3 5/16" | 6 | Cal/OSHA Compliant Title 8 Section 1646, OSHA Compliant 29 CFR 1926.451 | 0000000 | 000000 |
Solid | |||||||||||||||||
| 15,500 | 18" | 24" | 9 3/8" | 5 5/16" | 5 5/16" | 1 1/2" | Galvanized Steel | 1 3/8"-4 | 16 9/16" | No | 4 | 1/2" | 3 5/16" | 11 | Cal/OSHA Compliant Title 8 Section 1646, OSHA Compliant 29 CFR 1926.451 | 0000000 | 00000 |