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. Cast iron components have good machinability and high strength. 360 brass components have excellent machinability and good corrosion resistance. 932 bearing bronze components are more wear resistant than brass components. They have good machinability and fair corrosion resistance. 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.
For technical drawings and 3-D models, click on a part number.
| 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 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 7/8"-6 | 12" | 1 | 1:1 | 0.167" | Class 2G | Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 000000000 | 000000 |
| 7/8"-6 | 3 ft. | 1 | 1:1 | 0.167" | Class 2G | Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 000000000 | 00000 |
| 7/8"-6 | 6 ft. | 1 | 1:1 | 0.167" | Class 2G | Grade 2 | Rockwell B61 | 53,000 | ASTM A108 | 000000000 | 00000 |
| 7/8"-6 | 12 ft. | 1 | 1:1 | 0.167" | Class 2G | Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 000000000 | 000000 |
Alloy Steel | |||||||||||
| 7/8"-6 | 12" | 1 | 1:1 | 0.167" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 00000 |
| 7/8"-6 | 3 ft. | 1 | 1:1 | 0.167" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 00000 |
| 7/8"-6 | 6 ft. | 1 | 1:1 | 0.167" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 000000 |
18-8 Stainless Steel | |||||||||||
| 7/8"-6 | 12" | 1 | 1:1 | 0.167" | Class 2G | __ | Rockwell B96 | Not Rated | __ | 000000000 | 00000 |
| 7/8"-6 | 3 ft. | 1 | 1:1 | 0.167" | Class 2G | __ | Rockwell B96 | Not Rated | __ | 000000000 | 000000 |
| 7/8"-6 | 6 ft. | 1 | 1:1 | 0.167" | Class 2G | __ | Rockwell B96 | Not Rated | __ | 000000000 | 000000 |
| 7/8"-6 | 12 ft. | 1 | 1:1 | 0.167" | Class 2G | __ | Rockwell B96 | Not Rated | __ | 000000000 | 000000 |
316 Stainless Steel | |||||||||||
| 7/8"-6 | 12" | 1 | 1:1 | 0.167" | Class 2G | ASTM Grade B8M | Rockwell B97 | 75,000 | ASTM A193 | 000000000 | 00000 |
| 7/8"-6 | 3 ft. | 1 | 1:1 | 0.167" | Class 2G | ASTM Grade B8M | Rockwell B97 | 75,000 | ASTM A193 | 000000000 | 000000 |
| 7/8"-6 | 6 ft. | 1 | 1:1 | 0.167" | Class 2G | ASTM Grade B8M | Rockwell B97 | 75,000 | ASTM A193 | 000000000 | 000000 |
| 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 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 7/8"-6 | 3 ft. | 1 | 1:1 | 0.167" | Class 2G | Grade 2 | Rockwell B61 | 53,000 | ASTM A108 | 000000000 | 000000 |
| 7/8"-6 | 6 ft. | 1 | 1:1 | 0.167" | Class 2G | Grade 2 | Rockwell B61 | 53,000 | ASTM A108 | 000000000 | 00000 |
Alloy Steel | |||||||||||
| 7/8"-6 | 3 ft. | 1 | 1:1 | 0.167" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 00000 |
| 7/8"-6 | 6 ft. | 1 | 1:1 | 0.167" | Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 000000000 | 000000 |
Hex head screws fasten heavy loads. They’re generally shorter than lead screws and can be tightened with a wrench. Length is measured from under the head.
Head | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Lg. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Lg. | Wd. | Ht. | Thread Fit | Fastener Strength Grade/Class | Hardness | Tensile Strength, psi | Each | |
Carbon Steel | |||||||||||||
| 7/8"-6 | 3" | 1 | 1:1 | 0.167" | 2 1/2" to 3" | 1 5/16" | 35/64" | Class 2G | Grade 5 | Rockwell C19 | 105,000 | 000000000 | 000000 |
| 7/8"-6 | 4" | 1 | 1:1 | 0.167" | 3 1/2" to 4" | 1 5/16" | 35/64" | Class 2G | Grade 5 | Rockwell C19 | 105,000 | 000000000 | 00000 |
| 7/8"-6 | 6" | 1 | 1:1 | 0.167" | 5 1/2" to 6" | 1 5/16" | 35/64" | Class 2G | Grade 5 | Rockwell C19 | 105,000 | 000000000 | 00000 |
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 | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 7/8"-6 | 2 1/2" | 1 1/4" | 1 | 1:1 | 0.167" | Class 2G | Rockwell B75 | 000000000 | 000000 |
Flange nuts move objects along the length of a lead screw. Flange nuts have a wide machinable flange for custom mounting.
Flange | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Ht. | Dia. | Dia. | Thick. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Each | |
932 Bearing Bronze | |||||||||||
| 7/8"-6 | 1 3/4" | 1 1/4" | 2 1/4" | 1/2" | 1 | 1:1 | 0.167" | Class 2G | Not Rated | 000000000 | 0000000 |
Flange nuts move objects along the length of a lead screw. Flange nuts have a wide machinable flange for custom mounting.
Flange | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Ht. | Dia. | Dia. | Thick. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Each | |
932 Bearing Bronze | |||||||||||
| 7/8"-6 | 1 3/4" | 1 1/4" | 2 1/4" | 1/2" | 1 | 1:1 | 0.167" | Class 2G | Not Rated | 000000000 | 0000000 |
Round nuts move objects along the length of a lead screw.
Round nuts move objects along the length of a lead screw.
| Thread Size | Ht. | Dia. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Specifications Met | Each | |
360 Brass | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 7/8"-6 | 7/8" | 1 1/2" | 1 | 1:1 | 0.167" | Class 2G | Rockwell B55 | ASTM B16 | 000000000 | 000000 |
Hex nuts fasten and position lead screw components.
| Thread Size | Ht. | Wd. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Specifications Met | Each | |
Carbon Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 7/8"-6 | 55/64" | 1 7/16" | 1 | 1:1 | 0.167" | Class 2G | Rockwell B75 | __ | 000000000 | 00000 |
Zinc-Plated Carbon Steel | ||||||||||
| 7/8"-6 | 55/64" | 1 7/16" | 1 | 1:1 | 0.167" | Class 2G | Rockwell B75 | __ | 000000000 | 00000 |
360 Brass | ||||||||||
| 7/8"-6 | 7/8" | 1 1/2" | 1 | 1:1 | 0.167" | Class 2G | Rockwell B75 | ASTM B16 | 000000000 | 00000 |
18-8 Stainless Steel | ||||||||||
| 7/8"-6 | 55/64" | 1 1/2" | 1 | 1:1 | 0.167" | Class 2G | Not Rated | __ | 000000000 | 00000 |
Hex nuts fasten and position lead screw components.
| Thread Size | Ht. | Wd. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Fastener Strength Grade/Class | Hardness | Specifications Met | Each | |
Carbon Steel | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 7/8"-6 | 55/64" | 1 7/16" | 1 | 1:1 | 0.167" | Class 2G | Grade 2 | Rockwell B85 | __ | 000000000 | 000000 |
360 Brass | |||||||||||
| 7/8"-6 | 7/8" | 1 1/2" | 1 | 1:1 | 0.167" | Class 2G | __ | Rockwell B75 | ASTM B16 | 000000000 | 00000 |
18-8 Stainless Steel | |||||||||||
| 7/8"-6 | 55/64" | 1 1/2" | 1 | 1:1 | 0.167" | Class 2G | __ | Not Rated | __ | 000000000 | 00000 |
Square nuts fasten and position lead screw components. Square nuts have large sides, which make them easier to grip with a wrench than hex nuts and keep them from rotating in channels and square holes.
| Thread Size | Ht. | Wd. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Specifications Met | Each | |
360 Brass | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 7/8"-6 | 7/8" | 1 1/2" | 1 | 1:1 | 0.167" | Class 2G | Rockwell B55 | ASTM B16 | 000000000 | 000000 |
Square nuts fasten and position lead screw components. Square nuts have large sides, which make them easier to grip with a wrench than hex nuts and keep them from rotating in channels and square holes.
| Thread Size | Ht. | Wd. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Specifications Met | Each | |
360 Brass | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 7/8"-6 | 7/8" | 1 1/2" | 1 | 1:1 | 0.167" | Class 2G | Rockwell B55 | ASTM B16 | 000000000 | 000000 |
Handles fasten and position lead screw components. Handles are easy to grip and tighten by hand for quick assembly and disassembly.
| Thread Size | Ht. | Wd. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Each | |
Cast Iron | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 7/8"-6 | 1 1/8" | 9 1/2" | 1 | 1:1 | 0.167" | Class 2G | Rockwell B72 | 000000000 | 000000 |
Precision Acme Lead Screws and Nuts
Pair with a motor in automated motion and positioning applications. A tight thread fit allows these lead screws and nuts to make accurate, repeatable starts and stops. 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. To ensure compatibility, please select components that have the same thread direction, thread size, and number of thread starts.
Carbon steel lead screws and flanges have good machinability. Black-oxide alloy steel lead screws are hard and strong. They have mild corrosion resistance and a dark surface color.932 bearing bronze and 673 bronze nuts are wear resistant. They have good machinability and fair corrosion resistance. Cast iron nuts have good machinability and high strength.
Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Lg. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Accuracy for Travel Distance per Turn | Thread Fit | Hardness | Tensile Strength, psi | Each | |
1018 Carbon Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 7/8"-6 | 3 ft. | 1 | 1:1 | 0.167" | ±0.009" per ft. | Class 2C | Not Rated | Not Rated | 000000000 | 000000 |
| 7/8"-6 | 6 ft. | 1 | 1:1 | 0.167" | ±0.009" per ft. | Class 2C | Not Rated | Not Rated | 000000000 | 000000 |
| Thread Size | Lg. | Dia. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Dynamic Thrust Load Cap., lbs. | Each | |
Cast Iron | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 7/8"-6 | 2" | 2.985" | 1 | 1:1 | 0.167" | Class 2C | Not Rated | Not Rated | 000000000 | 000000 |
Combine externally threaded nuts with a flange to create a custom flange nut.
External Thread | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Lg. | Dia. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Size | Lg. | Thread Fit | Hardness | Dynamic Thrust Load Cap., lbs. | Each | |
673 Bronze | ||||||||||||
| 7/8"-6 | 1 1/2" | 1.5" | 1 | 1:1 | 0.167" | 1 3/8"-16 | 1/2" | Class 2C | Not Rated | Not Rated | 000000000 | 000000 |
Thread onto an externally threaded acme nut to create a custom flange nut.
Carbon steel flanges have good machinability. However, they will rust when exposed to moisture. Black-oxide carbon steel flanges have mild corrosion resistance in dry environments and a dark surface color. 303 stainless steel flanges have good corrosion resistance.
| Flange Thread Size | Flange Dia. | Flange Thick. | Bolt Circle Dia. | Flange Hardness | Each | |
Black-Oxide 1117 Carbon Steel | ||||||
|---|---|---|---|---|---|---|
| 1 3/8"-16 | 2 49/64" | 33/64" | 2 17/64" | Brinell 135 | 00000000 | 000000 |
Clamping Acme Lead Screw Collars
Thread these one-piece collars onto an Acme lead screw to separate and position components, or use them as an end stop to limit travel. Tighten the clamping screw to secure.
To ensure compatibility, please select a collar that has the same thread type, direction, size, and number of thread starts as your lead screw.
Black-oxide carbon steel collars have mild corrosion resistance.
For technical drawings and 3-D models, click on a part number.
| Thread Size | OD | Wd. | No. of Thread Starts | Hardness | Each | |
Right-Hand Threaded | ||||||
|---|---|---|---|---|---|---|
Black-Oxide 12L14 Carbon Steel | ||||||
| 7/8"-6 | 2 1/8" | 5/8" | 1 | Brinell 163 | 0000000 | 000000 |