About Nuts, Materials, and Finishes
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18-8 Stainless Steel Coupling Nuts
These coupling nuts have good chemical resistance and may be mildly magnetic. 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. | Wd. | 1-9 | 10-Up | |
18-8 Stainless Steel | |||||
| 1 1/4"-7 | 3" | 1 5/8" | 000000000 | 000000 | 000000 |
Super-Corrosion-Resistant 316 Stainless Steel Coupling Nuts
These coupling nuts have excellent resistance to chemicals and salt water. Also known as extension nuts, use them to connect and extend threaded rods. They may be mildly magnetic.
For technical drawings and 3-D models, click on a part number.
Each | |||||
|---|---|---|---|---|---|
| Thread Size | Lg. | Wd. | 1-9 | 10-Up | |
316 Stainless Steel | |||||
| 1 1/4"-7 | 3" | 1 5/8" | 000000000 | 0000000 | 0000000 |
Low-Strength Steel Coupling Nuts
Also known 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.
Hot-dipped galvanized steel coupling nuts have a thick coating for better corrosion resistance than zinc-plated steel nuts. They must be used with other hot-dipped galvanized fasteners.
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.
Left-Hand Threaded Low-Strength Steel Coupling Nuts
These coupling nuts tighten when turned to the left. Also known as extension nuts, use them to connect and extend threaded rods. They're made from low-strength steel for use them in light-duty fastening applications. A zinc plating provides corrosion resistance in wet environments.
For technical drawings and 3-D models, click on a part number.
Each | |||||
|---|---|---|---|---|---|
| Thread Size | Lg. | Wd. | 1-9 | 10-Up | |
Zinc-Plated Steel | |||||
| 1 1/4"-7 | 3" | 1 5/8" | 000000000 | 000000 | 000000 |
Medium-Strength Steel Coupling Nuts—Grade 5
Also known as extension nuts, use these to connect and extend threaded rods.
Zinc-plated steel coupling nuts resist corrosion in wet environments.
Hot-dipped galvanized steel coupling nuts have a thick coating for better corrosion resistance than zinc-plated steel nuts. They must be used with other hot-dipped galvanized fasteners.
For technical drawings and 3-D models, click on a part number.
High-Strength Steel Coupling Nuts—Grade 8
Also known as extension nuts, use these to connect and extend threaded rods. Made from Grade 8 steel, they're about 25% stronger than medium-strength steel coupling nuts. A zinc plating provides corrosion resistance in wet environments.
For technical drawings and 3-D models, click on a part number.
Each | |||||
|---|---|---|---|---|---|
| Thread Size | Lg. | Wd. | 1-9 | 10-Up | |
Zinc-Plated Steel—Grade 8 | |||||
| 1 1/4"-7 | 3" | 1 7/8" | 000000000 | 000000 | 000000 |
Extreme-Strength Steel Coupling Nuts
Also known as extension nuts, use these to connect and extend threaded rods. Made from Grade 2H steel, they're about 20% stronger than high-strength steel coupling nuts and comparable in strength to Grade 9 bolts.
For technical drawings and 3-D models, click on a part number.
Each | |||||
|---|---|---|---|---|---|
| Thread Size | Lg. | Wd. | 1-9 | 10-Up | |
Steel—ASTM Grade 2H | |||||
| 1 1/4"-7 | 3" | 2" | 000000000 | 000000 | 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.
Zinc-plated steel nuts resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
Each | ||||||
|---|---|---|---|---|---|---|
| Thread Size | Lg. | Wd. | Threading | 1-9 | 10-Up | |
Zinc-Plated Steel | ||||||
| 1 1/4"-7 | 7 1/2" | 2" | Partially Threaded | 000000000 | 000000 | 000000 |
Inch-to-Inch Female Hex Thread Adapters
Connect two differently sized male-threaded parts, such as threaded rods, and tighten with a standard wrench. The threads on these adapters have various sizes and spacing, so you can increase or decrease thread size or adapt from coarse to fine threading. You can also use them to change the gender of a connection from male to female. Small adapters can work as threaded standoffs, which position and separate circuit boards and other components in assemblies.
Zinc-plated steel adapters resist corrosion until the plating wears away and are often used in dry environments.
18-8 stainless steel adapters withstand wet environments but will corrode when exposed to salt water and other chloride solutions.
316 stainless steel adapters are ideal in wet environments and will not corrode when exposed to salt water or harsh chemicals.
Adapters that meet ASTM specifications are made from or plated with materials that adhere to standards for chemical and physical properties, such as hardness.
For technical drawings and 3-D models, click on a part number.
Thread Size | Thread Lg. | Thread Fit | Hex | Each | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (A) | (B) | (A) | (B) | (A) | (B) | Size | Lg. | Specifications Met | Hardness | 1-9 | 10-Up | |
Zinc-Plated Steel | ||||||||||||
| 3/4"-10 | 1 1/4"-7 | 3/4" | 1 1/16" | Class 2B | Class 2B | 1 5/8" | 3" | ASTM A108, ASTM B633 | Rockwell B65 | 000000000 | 000000 | 000000 |
| 7/8"-9 | 1 1/4"-7 | 7/8" | 1 1/16" | Class 2B | Class 2B | 1 5/8" | 3" | ASTM A108, ASTM B633 | Rockwell B65 | 000000000 | 00000 | 00000 |
| 1"-8 | 1 1/4"-7 | 1" | 1 1/16" | Class 2B | Class 2B | 1 5/8" | 3" | ASTM A108, ASTM B633 | Rockwell B65 | 000000000 | 00000 | 00000 |
18-8 Stainless Steel | ||||||||||||
| 3/4"-10 | 1 1/4"-7 | 3/4" | 1 1/16" | Class 2B | Class 2B | 1 5/8" | 3" | ASTM A582 | Rockwell B80 | 000000000 | 00000 | 00000 |
| 7/8"-9 | 1 1/4"-7 | 7/8" | 1 1/16" | Class 2B | Class 2B | 1 5/8" | 3" | ASTM A582 | Rockwell B80 | 000000000 | 00000 | 00000 |
| 1"-8 | 1 1/4"-7 | 1" | 1 1/16" | Class 2B | Class 2B | 1 5/8" | 3" | ASTM A582 | Rockwell B80 | 000000000 | 00000 | 00000 |
316 Stainless Steel | ||||||||||||
| 3/4"-10 | 1 1/4"-7 | 3/4" | 1 1/16" | Class 2B | Class 2B | 1 5/8" | 3" | ASTM A276 | Rockwell B83 | 000000000 | 00000 | 00000 |
Left-Hand to Right-Hand Female Hex Thread Adapters
Often called sleeve nuts, these thread adapters fasten parts with right-hand threads to parts with left-hand threads.
Zinc-plated steel adapters are strong and corrosion resistant.
For technical drawings and 3-D models, click on a part number.
Thread Size | Thread Lg. | Thread Fit | Hex | Each | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| (A) | (B) | (A) | (B) | (A) | (B) | Size | Lg. | Hardness | 1-9 | 10-Up | |
Zinc-Plated Steel | |||||||||||
| 1 1/4"-7 | 1 1/4"-7 | 3 1/2" | 3 1/2" | Class 2B | Class 2B | 2" | 7 1/2" | Rockwell B65 | 000000000 | 000000 | 000000 |