Selecting Compatible Lead Screws and Nuts
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About Nuts, Materials, and Finishes
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Metric Low-Strength Steel Coupling Nuts
Often referred to as extension nuts, use these to connect and extend threaded rods. They're about half the strength of medium-strength steel coupling nuts for use in light duty fastening applications.
Zinc-plated steel coupling nuts resist corrosion in wet environments.
Black-oxide steel coupling nuts have a dark surface color and are mildly corrosion resistant in dry environments.
For technical drawings and 3-D models, click on a part number.
Metric 18-8 Stainless Steel Coupling Nuts
Made from 18-8 stainless steel, these metric coupling nuts have good chemical resistance and may be mildly magnetic. Also known as extension nuts, use them to connect and extend threaded rods.
Coupling nuts with a black-oxide finish have a dark surface color.
For technical drawings and 3-D models, click on a part number.
Brass Coupling Nuts
These coupling nuts are corrosion resistant in wet environments, electrically conductive, and nonmagnetic. Also known as extension nuts, use them to connect and extend threaded rods.
For technical drawings and 3-D models, click on a part number.
Each | |||||
---|---|---|---|---|---|
Thread Size | Lg., mm | Wd., mm | 1-9 | 10-Up | |
Brass | |||||
M2 | 6 | 4 | 000000000 | 000000 | 000000 |
Aluminum Coupling Nuts
One-third the weight of steel, these aluminum coupling nuts are corrosion resistant in wet environments and nonmagnetic. Also known as extension nuts, use them to connect and extend threaded rods.
For technical drawings and 3-D models, click on a part number.
Thread | Each | |||||
---|---|---|---|---|---|---|
Size | Pitch, mm | Lg. | Wd. | 1-9 | 10-Up | |
6061 Aluminum | ||||||
M2 | 0.4 | 6mm | 4.5mm | 000000000 | 00000 | 00000 |
Plastic Coupling Nuts
These nylon 6/6 coupling nuts are chemical resistant, nonconductive, and lightweight. Also known as extension nuts, use them to connect and extend threaded rods.
For technical drawings and 3-D models, click on a part number.
Temperature Range, °F | Each | ||||||||
---|---|---|---|---|---|---|---|---|---|
Thread Size | Lg. | Wd. | Threading | Min. | Max. | Color | 1-9 | 10-Up | |
Nylon 6/6 Plastic | |||||||||
M2 | 6mm | 4mm | Fully Threaded | -40° | 250° | Off-White | 0000000 | 00000 | 00000 |
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.
Zinc-plated steel nuts resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
Thread | Each | ||||||
---|---|---|---|---|---|---|---|
Size | Pitch, mm | Lg., mm | Wd., mm | Threading | 1-9 | 10-Up | |
Zinc-Plated Steel | |||||||
M2 | 0.4 | 12 | 4.5 | Fully Threaded | 000000000 | 00000 | 00000 |
Slotted-Drive Male-Female Round Thread Adapters
18-8 stainless steel adapters resist corrosion better than brass adapters. They also withstand wet environments.
For technical drawings and 3-D models, click on a part number.
Thread Size | Thread Lg. | Gender | Thread Fit | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
(A) | Pitch (A), mm | (B) | Pitch (B), mm | (A) | (B) | (A) | (B) | (A) | (B) | Hardness | Each | |
18-8 Stainless Steel | ||||||||||||
M4 | 0.7 | M2 | 0.4 | 6.4mm | 6.4mm | Male | Female | Class 6G | Class 6H | Not Rated | 000000000 | 000000 |
Miniature Press-Fit Threaded Standoffs with Open End
Designed to fit in the limited space of compact electronics, such as laptops and hand-held devices, these standoffs have a recess under the head that clinches a panel while splines on the head bite in for an extra-strong hold. The open end creates a through hole. Standoffs have excellent wear resistance and may be mildly magnetic. Use a lever press to install.
For technical drawings and 3-D models, click on a part number.
Metric Fast-Travel Ultra-Precision Lead Screws and Nuts
Multiple thread channels (also known as thread starts) create faster linear travel than lead screws with a single thread start. Operating with less backlash (play) than Metric Precision Acme Lead Screws and Nuts, these lead screws and nuts provide increased nut life and more reliable movement in automated systems. To ensure compatibility, select components that have the same thread size, thread pitch, and number of thread starts.
Flange nuts with a wear-compensating internal O-ring resist backlash to keep the nuts in place and maintain a tight fit even when their threads begin to wear. They’re often used in 3D printing and robotic applications.
Acetal nuts have good wear and 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.
External Thread | ||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Thread Size | Thread Pitch, mm | Lg. | Wd. | Ht. | Dia. | Hex Wd. | No. of Thread Starts | Thread Type | Speed Ratio | Travel Distance per Turn, mm | Size | Lg. | Dynamic Thrust Load Cap., lbs. | Each | ||
Acetal Plastic | ||||||||||||||||
B | M2 | 0.5 | 11/16" | __ | __ | 0.297" | 7/16" | 2 | Metric Rounded Trapezoidal | 2:1 | 1 | 3/8"-24 | 3/16" | 10 | 000000000 | 000000 |
PEEK Plastic | ||||||||||||||||
C | M2 | 0.4 | 5/16" | 0.22" | 0.197" | __ | __ | 2 | Metric Rounded Trapezoidal | 2:1 | 0.75 | M5 | 9/64" | 2 | 00000000 | 00000 |
C | M2 | 0.4 | 5/16" | 0.22" | 0.197" | __ | __ | 4 | Metric Rounded Trapezoidal | 4:1 | 1.5 | M5 | 9/64" | 2 | 00000000 | 00000 |
C | M2 | 0.4 | 5/16" | 0.22" | 0.197" | __ | __ | 8 | Metric Rounded Trapezoidal | 8:1 | 3 | M5 | 9/64" | 2 | 00000000 | 00000 |
Flange | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Thread Size | Thread Pitch, mm | Lg. | Dia. | Wd. | Ht. | Thick. | No. of Thread Starts | Thread Type | Speed Ratio | Travel Distance per Turn, mm | Bolt Circle Dia. | Dynamic Thrust Load Cap., lbs. | Each | ||
Acetal Plastic | |||||||||||||||
D | M2 | 0.5 | 1/2" | 0.297" | 3/4" | 13/32" | 1/8" | 2 | Metric Rounded Trapezoidal | 2:1 | 1 | 39/64" | 10 | 000000000 | 000000 |
PEEK Plastic | |||||||||||||||
D | M2 | 0.4 | 9/32" | 0.209" | 15/32" | 15/64" | 5/64" | 2 | Metric Rounded Trapezoidal | 2:1 | 0.75 | 11/32" | 2 | 00000000 | 00000 |
D | M2 | 0.4 | 9/32" | 0.209" | 15/32" | 15/64" | 5/64" | 4 | Metric Rounded Trapezoidal | 4:1 | 1.5 | 11/32" | 2 | 00000000 | 00000 |
D | M2 | 0.4 | 9/32" | 0.209" | 15/32" | 15/64" | 5/64" | 8 | Metric Rounded Trapezoidal | 8:1 | 3 | 11/32" | 2 | 00000000 | 00000 |
PEEK Plastic with Wear-Compensating Internal O-Ring | |||||||||||||||
D | M2 | 0.4 | 5/16" | 0.228" | 15/32" | 15/64" | 5/64" | 2 | Metric Rounded Trapezoidal | 2:1 | 0.75 | 11/32" | 1 | 00000000 | 00000 |
D | M2 | 0.4 | 5/16" | 0.228" | 15/32" | 15/64" | 5/64" | 4 | Metric Rounded Trapezoidal | 4:1 | 1.5 | 11/32" | 1 | 00000000 | 00000 |
D | M2 | 0.4 | 5/16" | 0.228" | 15/32" | 15/64" | 5/64" | 8 | Metric Rounded Trapezoidal | 8:1 | 3 | 11/32" | 1 | 00000000 | 00000 |
Metric Ultra-Precision Lead Screws and Nuts
Operating with less backlash (play) than Metric 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. To ensure compatibility, select components that have the same thread size, thread type, thread size, thread pitch, and number of thread starts.
Flange nuts with wear-compensating internal O-ring maintain a tight fit even when their threads begin to wear. They resist backlash to maintain accuracy over time, which is important in positioning applications such as 3D printing and robotics.
Acetal nuts have good wear and 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.
External Thread | |||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Thread Size | Thread Pitch, mm | Lg. | Wd. | Ht. | Dia. | Hex Wd. | No. of Thread Starts | Thread Type | Speed Ratio | Travel Distance per Turn, mm | Size | Pitch | Lg. | Dynamic Thrust Load Cap., lbs. | Each | ||
Acetal Plastic | |||||||||||||||||
A | M2 | 0.5 | 11/16" | __ | __ | 0.297" | 7/16" | 1 | Metric Rounded Trapezoidal | 1:1 | 0.5 | 3/8"-24 | __ | 3/16" | 10 | 0000000 | 000000 |
PEEK Plastic | |||||||||||||||||
B | M2 | 0.4 | 5/16" | 0.22" | 0.197" | __ | __ | 1 | Metric Rounded Trapezoidal | 1:1 | 0.375 | M5 | 0.8mm | 9/64" | 2 | 000000000 | 00000 |
Flange | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Thread Size | Thread Pitch, mm | Lg. | Dia. | Wd. | Ht. | Thick. | No. of Thread Starts | Thread Type | Speed Ratio | Travel Distance per Turn, mm | Bolt Circle Dia. | Dynamic Thrust Load Cap., lbs. | Each | ||
Acetal Plastic | |||||||||||||||
C | M2 | 0.5 | 1/2" | 0.297" | 3/4" | 13/32" | 1/8" | 1 | Metric Rounded Trapezoidal | 1:1 | 0.5 | 39/64" | 10 | 0000000 | 000000 |
PEEK Plastic | |||||||||||||||
C | M2 | 0.4 | 9/32" | 0.209" | 15/32" | 15/64" | 5/64" | 1 | Metric Rounded Trapezoidal | 1:1 | 0.375 | 11/32" | 2 | 000000000 | 00000 |
PEEK Plastic with Wear-Compensating Internal O-Ring | |||||||||||||||
C | M2 | 0.4 | 5/16" | 0.228" | 15/32" | 15/64" | 5/64" | 1 | Metric Rounded Trapezoidal | 1:1 | 0.375 | 11/32" | 1 | 000000000 | 000000 |