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Coupling Nut

Paying attention to the details of your project, such as fastener types, helps you get top-quality results. Coupling nuts, also known as extension nuts, connect threaded rods and other threaded fasteners. The right coupling nut ensures your project stays secure, so it can do its intended job.

36 Items

Set Descending Direction
  1. 3/8" Coupling Nut Grade 2 Zinc UNC
    3/8" Coupling Nut Grade 2 Zinc UNC
    3/8" Coupling Nut, Grade 2 Zinc, UNC
    CF Product Code: UCAROD38
    CAD $0.69
    / Each
    In stock
    3/8" Coupling Nut, Grade 2 Zinc, UNC
    CF Product Code: UCAROD38
    CAD $0.69
    / Each
    In stock
  2. 1/2" Coupling Nut Grade 2 Zinc UNC
    1/2" Coupling Nut Grade 2 Zinc UNC
    1/2" Coupling Nut, Grade 2 Zinc, UNC
    CF Product Code: UCAROD12
    CAD $1.69
    / Each
    In stock
    1/2" Coupling Nut, Grade 2 Zinc, UNC
    CF Product Code: UCAROD12
    CAD $1.69
    / Each
    In stock
  3. 5/8" Coupling Nut, Grade 2 Zinc, UNC
    5/8" Coupling Nut, Grade 2 Zinc, UNC
    5/8" Coupling Nut, Grade 2 Zinc, UNC
    CF Product Code: UCAROD58
    CAD $5.99
    / Each
    In stock
    5/8" Coupling Nut, Grade 2 Zinc, UNC
    CF Product Code: UCAROD58
    CAD $5.99
    / Each
    In stock
  4. 1/4" Coupling Nut Grade 2 Zinc UNC
    1/4" Coupling Nut Grade 2 Zinc UNC
    1/4" Coupling Nut, Grade 2 Zinc, UNC
    CF Product Code: UCAROD14
    CAD $0.45
    / Each
    In stock
    1/4" Coupling Nut, Grade 2 Zinc, UNC
    CF Product Code: UCAROD14
    CAD $0.45
    / Each
    In stock
  5. 5/16" Coupling Nut Grade 2 Zinc UNC
    5/16" Coupling Nut Grade 2 Zinc UNC
    5/16" Coupling Nut, Grade 2 Zinc, UNC
    CF Product Code: UCAROD516L
    CAD $1.39
    / Each
    In stock
    5/16" Coupling Nut, Grade 2 Zinc, UNC
    CF Product Code: UCAROD516L
    CAD $1.39
    / Each
    In stock
  6. 3/8" Coupling Nut Grade 2 Zinc UNC
    3/8" Coupling Nut Grade 2 Zinc UNC
    CFT-Approved 3/8" x 1-3/4" Coupling Nut, Grade 2 Zinc, UNC
    CF Product Code: UCAROD38134
    CAD $1.59
    / Each
    In stock
    CFT-Approved 3/8" x 1-3/4" Coupling Nut, Grade 2 Zinc, UNC
    CF Product Code: UCAROD38134
    CAD $1.59
    / Each
    In stock
  7. Coupling Nut Reducer - 3/8" - 1/4"
    Coupling Nut Reducer - 3/8" - 1/4"
    CFT-Approved Coupling Nut Reducer - 3/8" - 1/4"
    CF Product Code: UCAROD3814
    CAD $0.99
    / Each
    In stock
    CFT-Approved Coupling Nut Reducer - 3/8" - 1/4"
    CF Product Code: UCAROD3814
    CAD $0.99
    / Each
    In stock
  8. 3/4" Coupling Nut, 18.8 Stainless Steel, UNC
    3/4" Coupling Nut, 18.8 Stainless Steel, UNC
    3/4" Coupling Nut, 18.8 Stainless Steel, UNC
    CF Product Code: STS1CN75C
    CAD $15.99
    / Each
    In stock
    3/4" Coupling Nut, 18.8 Stainless Steel, UNC
    CF Product Code: STS1CN75C
    CAD $15.99
    / Each
    In stock
  9. 1/2" Coupling Nut, 18.8 Stainless Steel, UNC
    1/2" Coupling Nut, 18.8 Stainless Steel, UNC
    1/2" Coupling Nut, 18.8 Stainless Steel, UNC
    CF Product Code: STS1CN50C
    CAD $8.99
    / Each
    In stock
    1/2" Coupling Nut, 18.8 Stainless Steel, UNC
    CF Product Code: STS1CN50C
    CAD $8.99
    / Each
    In stock
  10. 1/2" Coupling Nut Grade 2 Cadmium UNC
    1/2" Coupling Nut Grade 2 Cadmium UNC
    1/2" Coupling Nut, Grade 2 Cadmium, UNC
    CF Product Code: UCAROD12CAD
    CAD $1.59
    / Each
    In stock
    1/2" Coupling Nut, Grade 2 Cadmium, UNC
    CF Product Code: UCAROD12CAD
    CAD $1.59
    / Each
    In stock
  11. 1" Coupling Nut, Grade 2 Zinc, UNC
    1" Coupling Nut, Grade 2 Zinc, UNC
    1" Coupling Nut, Grade 2 Zinc, UNC
    CF Product Code: UCAROD1
    CAD $5.99
    / Each
    In stock
    1" Coupling Nut, Grade 2 Zinc, UNC
    CF Product Code: UCAROD1
    CAD $5.99
    / Each
    In stock
  12. 7/8" Coupling Nut, Grade 2 Cadmium, UNC
    7/8" Coupling Nut, Grade 2 Cadmium, UNC
    7/8" Coupling Nut, Grade 2 Cadmium, UNC
    CF Product Code: UCAROD78CAD
    CAD $5.99
    / Each
    In stock
    7/8" Coupling Nut, Grade 2 Cadmium, UNC
    CF Product Code: UCAROD78CAD
    CAD $5.99
    / Each
    In stock
  13. 7/8" Coupling Nut Grade 2 Zinc UNC
    7/8" Coupling Nut Grade 2 Zinc UNC
    7/8" Coupling Nut, Grade 2 Zinc, UNC
    CF Product Code: UCAROD78
    CAD $9.99
    / Each
    In stock
    7/8" Coupling Nut, Grade 2 Zinc, UNC
    CF Product Code: UCAROD78
    CAD $9.99
    / Each
    In stock
  14. 5/8" Coupling Nut Grade 2 Cadmium UNC
    5/8" Coupling Nut Grade 2 Cadmium UNC
    5/8" Coupling Nut, Grade 2 Cadmium, UNC
    CF Product Code: UCAROD58CAD
    CAD $1.89
    / Each
    In stock
    5/8" Coupling Nut, Grade 2 Cadmium, UNC
    CF Product Code: UCAROD58CAD
    CAD $1.89
    / Each
    In stock
  15. 5/16" Coupling Nut Grade 2 Zinc UNC
    5/16" Coupling Nut Grade 2 Zinc UNC
    5/16" Coupling Nut, Grade 2 Zinc, UNC
    CF Product Code: UCAROD516
    CAD $1.39
    / Each
    In stock
    5/16" Coupling Nut, Grade 2 Zinc, UNC
    CF Product Code: UCAROD516
    CAD $1.39
    / Each
    In stock
  16. 3/4" Coupling Nut Grade 2 Galvanized UNC
    3/4" Coupling Nut Grade 2 Galvanized UNC
    3/4" Coupling Nut, Galvanized, UNC
    CF Product Code: UCAROD34HDG
    CAD $10.99
    / Each
    In stock
    3/4" Coupling Nut, Galvanized, UNC
    CF Product Code: UCAROD34HDG
    CAD $10.99
    / Each
    In stock
  17. 3/4" Coupling Nut, 316 Stainless Steel, UNC
    3/4" Coupling Nut, 316 Stainless Steel, UNC
    3/4" Coupling Nut, 316 Stainless Steel, UNC
    CF Product Code: UCAROD012316SS
    CAD $34.99
    / Each
    In stock
    3/4" Coupling Nut, 316 Stainless Steel, UNC
    CF Product Code: UCAROD012316SS
    CAD $34.99
    / Each
    In stock
  18. 3/8" Coupling Nut 316 Stainless Steel UNC
    3/8" Coupling Nut 316 Stainless Steel UNC
    3/8" Coupling Nut, 316 Stainless Steel, UNC
    CF Product Code: UCAROD006316SS
    CAD $9.99
    / Each
    In stock
    3/8" Coupling Nut, 316 Stainless Steel, UNC
    CF Product Code: UCAROD006316SS
    CAD $9.99
    / Each
    In stock
  19. 3/4" Coupling Nut, Grade 2 Zinc, UNC
    3/4" Coupling Nut, Grade 2 Zinc, UNC
    UCAN 3/4" Coupling Nut, Grade 2 Zinc, UNC
    CF Product Code: UCAROD34
    CAD $5.99
    / Each
    In stock
    UCAN 3/4" Coupling Nut, Grade 2 Zinc, UNC
    CF Product Code: UCAROD34
    CAD $5.99
    / Each
    In stock
  20. 5/8" Coupling Nut, 18.8 Stainless Steel, UNC
    5/8" Coupling Nut, 18.8 Stainless Steel, UNC
    5/8" Coupling Nut, 18.8 Stainless Steel, UNC
    CF Product Code: STS1CN62C
    CAD $16.99
    / Each
    In stock
    5/8" Coupling Nut, 18.8 Stainless Steel, UNC
    CF Product Code: STS1CN62C
    CAD $16.99
    / Each
    In stock
  21. 5/16" Coupling Nut, 18.8 Stainless Steel, UNC
    5/16" Coupling Nut, 18.8 Stainless Steel, UNC
    5/16" Coupling Nut, 18.8 Stainless Steel, UNC
    CF Product Code: STS1CN31C
    CAD $5.99
    / Each
    In stock
    5/16" Coupling Nut, 18.8 Stainless Steel, UNC
    CF Product Code: STS1CN31C
    CAD $5.99
    / Each
    In stock
  22. 1/4" Coupling Nut, 18.8 Stainless Steel, UNC
    1/4" Coupling Nut, 18.8 Stainless Steel, UNC
    1/4" Coupling Nut, 18.8 Stainless Steel, UNC
    CF Product Code: STS1CN25C
    CAD $1.99
    / Each
    In stock
    1/4" Coupling Nut, 18.8 Stainless Steel, UNC
    CF Product Code: STS1CN25C
    CAD $1.99
    / Each
    In stock
  23. 1" Coupling Nut Grade 2 Cadmium UNC
    1" Coupling Nut Grade 2 Cadmium UNC
    1" Coupling Nut, Grade 2 Cadmium, UNC
    CF Product Code: UCAROD1CAD
    CAD $6.99
    / Each
    In stock
    1" Coupling Nut, Grade 2 Cadmium, UNC
    CF Product Code: UCAROD1CAD
    CAD $6.99
    / Each
    In stock
  24. 1-1/2" Coupling Nut Grade 2 Galvanized UNC
    1-1/2" Coupling Nut Grade 2 Galvanized UNC
    1-1/2" Coupling Nut, Grade 2 Galvanized, UNC
    CF Product Code: UCAROD112GALV
    CAD $20.99
    / Each
    In stock
    1-1/2" Coupling Nut, Grade 2 Galvanized, UNC
    CF Product Code: UCAROD112GALV
    CAD $20.99
    / Each
    In stock
  25. 3/4"-10 Coupling Nut Bright Zinc Plated UNC
    3/4"-10 Coupling Nut Bright Zinc Plated UNC
    3/4"-10 Coupling Nut, Bright Zinc Plated, UNC
    CF Product Code: PPC141926
    CAD $2.99
    / Each
    Special Order
    Not Stocked. We will contact you with an ETA after an order is placed.
    3/4"-10 Coupling Nut, Bright Zinc Plated, UNC
    CF Product Code: PPC141926
    CAD $2.99
    / Each
    Special Order
    Not Stocked. We will contact you with an ETA after an order is placed.
  26. 3/8" Coupling Nut, 18.8 Stainless Steel, UNC
    3/8" Coupling Nut, 18.8 Stainless Steel, UNC
    3/8" Coupling Nut, 18.8 Stainless Steel, UNC
    CF Product Code: STS1CN37C
    CAD $2.99
    / Each
    Special Order
    Not Stocked. We will contact you with an ETA after an order is placed.
    3/8" Coupling Nut, 18.8 Stainless Steel, UNC
    CF Product Code: STS1CN37C
    CAD $2.99
    / Each
    Special Order
    Not Stocked. We will contact you with an ETA after an order is placed.
  27. 7/16" Coupling Nut, Grade 2 Zinc, UNC
    7/16" Coupling Nut, Grade 2 Zinc, UNC
    7/16" Coupling Nut, Grade 2 Zinc, UNC
    CF Product Code: UCAROD716
    CAD $1.79
    / Each
    Special Order
    Not Stocked. We will contact you with an ETA after an order is placed.
    7/16" Coupling Nut, Grade 2 Zinc, UNC
    CF Product Code: UCAROD716
    CAD $1.79
    / Each
    Special Order
    Not Stocked. We will contact you with an ETA after an order is placed.
  28. Steel Coupler - 1 x 2
    Steel Coupler - 1 x 2
    CFT-Approved Steel Coupler - 1 x 2
    CF Product Code: TSM1RCP
    CAD $2.39
    / Each
    Special Order
    Not Stocked. We will contact you with an ETA after an order is placed.
    CFT-Approved Steel Coupler - 1 x 2
    CF Product Code: TSM1RCP
    CAD $2.39
    / Each
    Special Order
    Not Stocked. We will contact you with an ETA after an order is placed.
  29. 3/8" Coupling Nut, Grade 2 Zinc, UNC
    3/8" Coupling Nut, Grade 2 Zinc, UNC
    3/8" Coupling Nut, Grade 2 Zinc, UNC
    CF Product Code: PPC141918
    CAD $0.59
    / Each
    Special Order
    Not Stocked. We will contact you with an ETA after an order is placed.
    3/8" Coupling Nut, Grade 2 Zinc, UNC
    CF Product Code: PPC141918
    CAD $0.59
    / Each
    Special Order
    Not Stocked. We will contact you with an ETA after an order is placed.
  30. 1/2" to 3/8" Coupling Reducer, Grade 2 Zinc, UNC
    1/2" to 3/8" Coupling Reducer, Grade 2 Zinc, UNC
    1/2" to 3/8" Coupling Reducer, Grade 2 Zinc, UNC
    CF Product Code: CNS250677
    CAD $6.99
    / Each
    Special Order
    Not Stocked. We will contact you with an ETA after an order is placed.
    1/2" to 3/8" Coupling Reducer, Grade 2 Zinc, UNC
    CF Product Code: CNS250677
    CAD $6.99
    / Each
    Special Order
    Not Stocked. We will contact you with an ETA after an order is placed.
  31. 3/8" Coupling Nut Grade 2 Cadmium UNC
    3/8" Coupling Nut Grade 2 Cadmium UNC
    3/8" Coupling Nut, Grade 2 Cadmium, UNC
    CF Product Code: UCAROD38LCAD
    CAD $0.69
    / Each
    Special Order
    Not Stocked. We will contact you with an ETA after an order is placed.
    3/8" Coupling Nut, Grade 2 Cadmium, UNC
    CF Product Code: UCAROD38LCAD
    CAD $0.69
    / Each
    Special Order
    Not Stocked. We will contact you with an ETA after an order is placed.
  32. 3/4" Coupling Nut Grade 2 Cadmium UNC
    3/4" Coupling Nut Grade 2 Cadmium UNC
    3/4" Coupling Nut, Grade 2 Cadmium, UNC
    CF Product Code: UCAROD34CAD
    CAD $12.99
    / Each
    Special Order
    Not Stocked. We will contact you with an ETA after an order is placed.
    3/4" Coupling Nut, Grade 2 Cadmium, UNC
    CF Product Code: UCAROD34CAD
    CAD $12.99
    / Each
    Special Order
    Not Stocked. We will contact you with an ETA after an order is placed.
  33. 1-1/4" Coupling Nut, Grade 2 Cadmium, UNC
    1-1/4" Coupling Nut, Grade 2 Cadmium, UNC
    1-1/4" Coupling Nut, Grade 2 Cadmium, UNC
    CF Product Code: UCAROD114CAD
    CAD $43.99
    / Each
    Special Order
    Not Stocked. We will contact you with an ETA after an order is placed.
    1-1/4" Coupling Nut, Grade 2 Cadmium, UNC
    CF Product Code: UCAROD114CAD
    CAD $43.99
    / Each
    Special Order
    Not Stocked. We will contact you with an ETA after an order is placed.
  34. 1-1/2" Coupling Nut, Grade 2 Cadmium, UNC
    1-1/2" Coupling Nut, Grade 2 Cadmium, UNC
    1-1/2" Coupling Nut, Grade 2 Cadmium, UNC
    CF Product Code: UCAROD112CAD
    CAD $81.99
    / Each
    Special Order
    Not Stocked. We will contact you with an ETA after an order is placed.
    1-1/2" Coupling Nut, Grade 2 Cadmium, UNC
    CF Product Code: UCAROD112CAD
    CAD $81.99
    / Each
    Special Order
    Not Stocked. We will contact you with an ETA after an order is placed.
  35. 5/8" Coupling Nut, 316 Stainless Steel
    5/8" Coupling Nut, 316 Stainless Steel
    5/8" Coupling Nut, 316 Stainless Steel
    CF Product Code: UCAROD010316SS
    CAD $28.99
    / Each
    Special Order
    Not Stocked. We will contact you with an ETA after an order is placed.
    5/8" Coupling Nut, 316 Stainless Steel
    CF Product Code: UCAROD010316SS
    CAD $28.99
    / Each
    Special Order
    Not Stocked. We will contact you with an ETA after an order is placed.
  36. 1/2" Coupling Nut 316 Stainless Steel UNC
    1/2" Coupling Nut 316 Stainless Steel UNC
    1/2" Coupling Nut, 316 Stainless Steel, UNC
    CF Product Code: UCAROD008316SS
    CAD $5.99
    / Each
    Special Order
    Not Stocked. We will contact you with an ETA after an order is placed.
    1/2" Coupling Nut, 316 Stainless Steel, UNC
    CF Product Code: UCAROD008316SS
    CAD $5.99
    / Each
    Special Order
    Not Stocked. We will contact you with an ETA after an order is placed.

36 Items

Set Descending Direction

Purchasing Coupling Nuts

Whether you call them coupling nuts or extension nuts, these parts attach threaded rods and other male-threaded fasteners. They often have a hex-shape construction for a wrench hole. However, they can also come in a round shape for specific applications. While hex coupling nuts look like an extended form of hex nuts, they have different applications.

The uses of a hex or round coupling nut include:

  • Joining identical parts: A coupling nut can connect two threaded parts with the same diameter and pitch. In this situation, you can use the coupling nut to extend the part's length, such as in the case of two threaded rods.
  • Connecting different parts: Coupling nuts can also join two different types of parts. The fasteners involved can have the same diameter and pitch or different ones, and you can choose a coupling nut that fits the situation. A coupling nut reducer has different pitches and diameters on each end to connect two parts with distinct sizes.
  • Acting as a standoff or spacer: In cases where you need to fasten two parts while separating them, a coupling nut can work as a standoff or spacer.

When searching for a coupling nut, it helps to understand how we note their sizes. A coupling nut's diameter should match the size of the fastener you plan to connect. In some projects, you need the threaded parts to connect to half of the coupling nut's thickness. In this situation, you can drill a hole in the middle of the nut to see where the fastener ends meet.

Coupling Nuts From Construction Fasteners and Tools

The team at Construction Fasteners and Tools strives to provide every part you need for your next project. We stock a variety of coupling nuts with the following specifications:

  • Sizes: 1/4 inch to 1 1/2 inches
  • Plating: Stainless steel, zinc, cadmium, galvanized steel and yellow zinc
  • Grades: 2, 18.8 and 316
  • Types: Hex coupling nut, round coupling nut and coupling nut reducer

If you have another type of coupling nut in mind for your job, we welcome you to contact us. Let our team work with you to source the fastener you need for the best results.

Count on Construction Fasteners and Tools for Coupling Nuts and Other Fasteners

Construction Fasteners and Tools combines an unmatched product selection with top-quality customer service. We work with DIYers and contractors to give them the parts they need to get the job done. With free shipping on orders over $99, you will also get your purchase quickly and affordably. Call us today at 1-866-238-8880 or contact our team online for more information.