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.
18-8 stainless steel components have good corrosion resistance. 316 stainless steel components have excellent 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.
| 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 | |
18-8 Stainless Steel | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Acme | 1/4"-16 | 12" | 1 | 1:1 | 0.063" | Class 2G | __ | Rockwell B96 | Not Rated | __ | 000000000 | 000000 |
| Acme | 3/8"-12 | 12" | 1 | 1:1 | 0.083" | Class 2G | __ | Rockwell B96 | Not Rated | __ | 000000000 | 00000 |
| Acme | 1/2"-8 | 12" | 1 | 1:1 | 0.125" | Class 2G | __ | Rockwell B96 | Not Rated | __ | 000000000 | 00000 |
| Acme | 1/2"-10 | 12" | 1 | 1:1 | 0.1" | Class 2G | __ | Rockwell B96 | Not Rated | __ | 000000000 | 00000 |
| Acme | 5/8"-6 | 12" | 1 | 1:1 | 0.167" | Class 2G | __ | Rockwell B96 | Not Rated | __ | 000000000 | 00000 |
| Acme | 5/8"-8 | 12" | 1 | 1:1 | 0.125" | Class 2G | __ | Rockwell B96 | Not Rated | __ | 000000000 | 00000 |
| Acme | 3/4"-5 | 12" | 1 | 1:1 | 0.2" | Class 2G | __ | Rockwell B96 | Not Rated | __ | 000000000 | 00000 |
| Acme | 3/4"-6 | 12" | 1 | 1:1 | 0.167" | Class 2G | __ | Rockwell B96 | Not Rated | __ | 000000000 | 00000 |
| Acme | 3/4"-8 | 12" | 1 | 1:1 | 0.125" | Class 2G | __ | Rockwell B96 | Not Rated | __ | 000000000 | 00000 |
| Acme | 7/8"-6 | 12" | 1 | 1:1 | 0.167" | Class 2G | __ | Rockwell B96 | Not Rated | __ | 000000000 | 00000 |
| Acme | 1"-4 | 12" | 1 | 1:1 | 0.25" | Class 2G | __ | Rockwell B96 | Not Rated | __ | 000000000 | 00000 |
| Acme | 1"-5 | 12" | 1 | 1:1 | 0.2" | Class 2G | __ | Rockwell B96 | Not Rated | __ | 000000000 | 00000 |
| Stub Acme | 3/8"-8 | 12" | 1 | 1:1 | 0.125" | Class 2G | __ | Rockwell B96 | Not Rated | __ | 000000000 | 00000 |
| Stub Acme | 3/8"-10 | 12" | 1 | 1:1 | 0.1" | Class 2G | __ | Rockwell B96 | Not Rated | __ | 000000000 | 00000 |
316 Stainless Steel | ||||||||||||
| Acme | 1/4"-16 | 12" | 1 | 1:1 | 0.063" | Class 2G | ASTM Grade B8M | Rockwell B97 | 75,000 | ASTM A193 | 000000000 | 00000 |
| Acme | 3/8"-12 | 12" | 1 | 1:1 | 0.083" | Class 2G | ASTM Grade B8M | Rockwell B97 | 75,000 | ASTM A193 | 000000000 | 00000 |
| Acme | 1/2"-10 | 12" | 1 | 1:1 | 0.1" | Class 2G | ASTM Grade B8M | Rockwell B97 | 75,000 | ASTM A193 | 000000000 | 00000 |
| Acme | 5/8"-8 | 12" | 1 | 1:1 | 0.125" | Class 2G | ASTM Grade B8M | Rockwell B97 | 75,000 | ASTM A193 | 000000000 | 00000 |
| Acme | 3/4"-5 | 12" | 1 | 1:1 | 0.2" | Class 2G | ASTM Grade B8M | Rockwell B97 | 75,000 | ASTM A193 | 000000000 | 00000 |
| Acme | 3/4"-6 | 12" | 1 | 1:1 | 0.167" | Class 2G | ASTM Grade B8M | Rockwell B97 | 75,000 | ASTM A193 | 000000000 | 00000 |
| Acme | 7/8"-6 | 12" | 1 | 1:1 | 0.167" | Class 2G | ASTM Grade B8M | Rockwell B97 | 75,000 | ASTM A193 | 000000000 | 00000 |
| Acme | 1"-4 | 12" | 1 | 1:1 | 0.25" | Class 2G | ASTM Grade B8M | Rockwell B97 | 75,000 | ASTM A193 | 000000000 | 00000 |
| Acme | 1"-5 | 12" | 1 | 1:1 | 0.2" | Class 2G | ASTM Grade B8M | Rockwell B97 | 75,000 | ASTM A193 | 000000000 | 00000 |
| Acme | 1"-6 | 12" | 1 | 1:1 | 0.167" | Class 2G | ASTM Grade B8M | Rockwell B97 | 75,000 | ASTM A193 | 000000000 | 00000 |
| Acme | 1"-10 | 12" | 1 | 1:1 | 0.1" | Class 2G | ASTM Grade B8M | Rockwell B97 | 75,000 | ASTM A193 | 000000000 | 000000 |
| Acme | 1 1/4"-5 | 12" | 1 | 1:1 | 0.2" | Class 2G | ASTM Grade B8M | Rockwell B97 | 75,000 | ASTM A193 | 000000000 | 000000 |
| Acme | 1 1/2"-4 | 12" | 1 | 1:1 | 0.25" | Class 2G | ASTM Grade B8M | Rockwell B97 | 75,000 | ASTM A193 | 000000000 | 000000 |
| Stub Acme | 3/8"-8 | 12" | 1 | 1:1 | 0.125" | Class 2G | ASTM Grade B8M | Rockwell B97 | 75,000 | ASTM A193 | 000000000 | 00000 |
Ultra-Precision Lead Screws and Nuts
Operating with less backlash (play) than Precision Acme Lead Screws and Nuts, these provide increased nut life and more reliable movement in automated systems. 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. All components are corrosion resistant for use in harsh environments. To ensure compatibility, select components that have the same thread type, thread size, and number of thread starts.
Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.
| Thread Size | Lg. | No. of Thread Starts | Thread Type | Speed Ratio | Travel Distance per Turn | Accuracy for Travel Distance per Turn | Hardness | Tensile Strength, psi | Each | |
303 Stainless Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1/8"-20.8 | 1 ft. | 1 | Rounded Acme | 1:1 | 0.048" | ±0.0006" per in. | Brinell 160 | 90,000 | 00000000 | 000000 |
| 1/8"-41.7 | 1 ft. | 1 | Rounded Acme | 1:1 | 0.024" | ±0.0006" per in. | Brinell 160 | 90,000 | 00000000 | 00000 |
| 9/64"-20.8 | 1 ft. | 1 | Rounded Acme | 1:1 | 0.048" | ±0.0006" per in. | Brinell 160 | 90,000 | 00000000 | 00000 |
| 1/4"-20 | 1 ft. | 1 | Rounded Acme | 1:1 | 0.05" | ±0.0006" per in. | Brinell 160 | 90,000 | 00000000 | 00000 |
| 1/4"-40 | 1 ft. | 1 | Rounded Acme | 1:1 | 0.025" | ±0.0006" per in. | Brinell 160 | 90,000 | 00000000 | 00000 |