About Nuts, Materials, and Finishes
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Selecting Compatible Lead Screws and Nuts
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Low-Strength Steel Hex Nuts
About half the strength of medium-strength steel nuts, these nuts are for light duty fastening applications, such as securing access panels.
For technical drawings and 3-D models, click on a part number.
Thread Size | Wd. | Ht. | Specifications Met | Pkg. Qty. | Pkg. | |
Steel—Grade 2 | ||||||
---|---|---|---|---|---|---|
2 1/2"-4 | 3 3/4" | 2 5/32" | ASME B18.2.2 | 1 | 000000000 | 000000 |
Low-Strength Steel Thin Hex Nuts
Also known as jam nuts, these are about half the height of standard hex nuts. Use them in low-clearance applications or jam one against another nut to hold it in place. About half the strength of medium-strength steel thin nuts, use them for light duty fastening applications, such as securing access panels.
For technical drawings and 3-D models, click on a part number.
Thread | ||||||
---|---|---|---|---|---|---|
Size | Spacing | Wd. | Ht. | Pkg. Qty. | Pkg. | |
Steel—Grade 2 | ||||||
2 1/2"-4 | Coarse | 3 3/4" | 1 13/32" | 1 | 000000000 | 000000 |
Extreme-Strength Steel Heavy Hex Nuts—Grade 2H
Because they’re about 10% wider and taller than standard hex nuts, these heavy hex nuts distribute the load over a large area. Grade 2H nuts are comparable in strength to Grade 9 bolts. They're about 20% stronger than high-strength steel nuts and are used in heavy machinery, such as earth-moving equipment.
For technical drawings and 3-D models, click on a part number.
Thread Size | Wd. | Ht. | Specifications Met | Pkg. Qty. | Pkg. | |
Steel—ASTM Grade 2H | ||||||
---|---|---|---|---|---|---|
2 1/2"-4 | 3 7/8" | 2 29/64" | ASME B18.2.2, ASTM A194 | 1 | 000000000 | 000000 |
Medium-Strength Steel Heavy Hex Nuts—Grade 5
About 10% wider and taller than standard hex nuts, these heavy nuts distribute the load over a large area. Medium-strength steel nuts are suitable for fastening most machinery and equipment.
For technical drawings and 3-D models, click on a part number.
Thread Size | Wd. | Ht. | Pkg. Qty. | Pkg. | |
Steel—Grade 5 | |||||
---|---|---|---|---|---|
2 1/2"-4 | 3 7/8" | 2 29/64" | 1 | 000000000 | 000000 |
Low-Strength Steel Thin Heavy Hex Nuts
Also known as heavy jam nuts, these are about half the height and 10% wider than standard hex nuts. Use them in low-clearance applications or jam against another heavy hex nut to hold it in place. Made from low-strength steel, use them in light duty fastening applications, such as securing access panels.
For technical drawings and 3-D models, click on a part number.
Thread Size | Wd. | Ht. | Pkg. Qty. | Pkg. | |
Steel—Grade 2 | |||||
---|---|---|---|---|---|
2 1/2"-4 | 3 7/8" | 1 29/64" | 1 | 000000000 | 000000 |
Steel Extra-Long Coupling Nuts
Also known as sleeve nuts, these are at least twice the length of standard coupling nuts to provide more room to connect and extend long lengths of threaded rods.
For technical drawings and 3-D models, click on a part number.
Each | ||||||
---|---|---|---|---|---|---|
Thread Size | Lg. | Wd. | Threading | 1-9 | 10-Up | |
Steel | ||||||
2 1/2"-4 | 10" | 4" | Partially Threaded | 000000000 | 0000000 | 0000000 |
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. 360 brass components have excellent machinability and good corrosion resistance. 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.
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 | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
2 1/2"-4 | 12" | 1 | 1:1 | 0.25" | Class 2G | Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 000000000 | 0000000 |
2 1/2"-4 | 3 ft. | 1 | 1:1 | 0.25" | Class 2G | Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 000000000 | 000000 |
2 1/2"-4 | 6 ft. | 1 | 1:1 | 0.25" | Class 2G | Grade 2 | Rockwell B61 | 53,000 | ASTM A108 | 000000000 | 000000 |
Alloy Steel | |||||||||||
2 1/2"-4 | 3 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 Size | Ht. | Wd. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Each | |
Carbon Steel | |||||||||
---|---|---|---|---|---|---|---|---|---|
2 1/2"-4 | 5" | 3 1/2" | 1 | 1:1 | 0.25" | Class 2G | Rockwell B75 | 000000000 | 0000000 |
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 | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
2 1/2"-4 | 2 1/2" | 3 1/2" | 1 | 1:1 | 0.25" | Class 2G | Rockwell B75 | __ | 000000000 | 0000000 |
Zinc-Plated Carbon Steel | ||||||||||
2 1/2"-4 | 2 1/2" | 3 1/2" | 1 | 1:1 | 0.25" | Class 2G | Rockwell B75 | __ | 000000000 | 000000 |
360 Brass | ||||||||||
2 1/2"-4 | 2 1/2" | 3 1/2" | 1 | 1:1 | 0.25" | Class 2G | Rockwell B75 | ASTM B16 | 000000000 | 000000 |
18-8 Stainless Steel | ||||||||||
2 1/2"-4 | 2 1/2" | 3 1/2" | 1 | 1:1 | 0.25" | Class 2G | Rockwell B97 | __ | 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.932 bearing bronze and 673 bronze nuts are wear resistant. They have good machinability and fair corrosion resistance.
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 | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
2 1/2"-4 | 3 ft. | 1 | 1:1 | 0.25" | ±0.009" per ft. | Class 2C | Brinell 126 | 64,000 | 000000000 | 0000000 |
2 1/2"-4 | 6 ft. | 1 | 1:1 | 0.25" | ±0.009" per ft. | Class 2C | Brinell 126 | 64,000 | 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 | ||||||||||||
2 1/2"-4 | 3 3/8" | 3.375" | 1 | 1:1 | 0.25" | 3 9/64"-12 | 1 9/16" | Class 2C | Brinell 70 | Not Rated | 000000000 | 0000000 |
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 | |
1117 Carbon Steel | ||||||
---|---|---|---|---|---|---|
3 9/64"-12 | 5 3/8" | 1 37/64" | 4 3/8" | Brinell 156 | 000000000 | 0000000 |