System of Measurement System of Measurement |
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Thread Pitch Thread Pitch |
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External Hex | Slotted |
Coupling Nut Profile Coupling Nut Profile |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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For Adapting For Adapting |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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About Nuts, Materials, and Finishes
More
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 | |||||
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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 | |||||
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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 | ||||||||
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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 | ||||||
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Size | Pitch, mm | Lg., mm | Wd., mm | Threading | 1-9 | 10-Up | |
Zinc-Plated Steel | |||||||
M2 | 0.4 | 12 | 4.5 | Fully Threaded | 000000000 | 000000 | 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 | |||||||||
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(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-stong 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.