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    27 Products

    Coupling Nuts

    Image of Product. Front orientation. Coupling Nuts. Coupling Nuts.
    Also known as extension nuts, these are commonly used to connect lengths of threaded rod and join threaded parts.
    Medium-Strength Steel
    These Grade 5 or Class 8 nuts are about twice as strong as low-strength steel coupling nuts. Use them with threaded rods that have a comparable strength rating to avoid stripping threads during installation.
    Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.
    Hot-Dipped Galvanized Steel—Combines the strength of steel with the rust resistance of stainless steel. These nuts are an economical alternative to 18-8 stainless steel in wet and outdoor environments, but they won't hold up to salt water and chemicals. Use with other hot-dipped galvanized fasteners to ensure the threads mate tightly.
    Each
    Thread
    Size
    Lg.
    Wd.
    Fastener Strength
    Grade/Class
    Threading
    1-9
    10-49
    50-Up
    Zinc-Plated Steel
    8-32
    		5/8"1/2"SAE Grade 5
    		Fully Threaded000000000000000000000000
    10-24
    		3/4"1/2"SAE Grade 5
    		Fully Threaded000000000000000000000
    10-32
    		3/4"1/2"SAE Grade 5
    		Fully Threaded000000000000000000000
    1/4"-20
    		7/8"1/2"SAE Grade 5
    		Fully Threaded000000000000000000000
    1/4"-28
    		7/8"1/2"SAE Grade 5
    		Fully Threaded000000000000000000000
    5/16"-18
    		1 1/8"1/2"SAE Grade 5
    		Fully Threaded000000000000000000000
    5/16"-24
    		1 1/8"1/2"SAE Grade 5
    		Fully Threaded000000000000000000000
    3/8"-16
    		1 3/4"5/8"SAE Grade 5
    		Fully Threaded000000000000000000000
    3/8"-24
    		1 3/4"5/8"SAE Grade 5
    		Fully Threaded000000000000000000000
    7/16"-14
    		1 3/4"5/8"SAE Grade 5
    		Fully Threaded000000000000000000000
    7/16"-20
    		1 3/4"5/8"SAE Grade 5
    		Fully Threaded000000000000000000000
    1/2"-13
    		1 3/4"3/4"SAE Grade 5
    		Fully Threaded000000000000000000000
    1/2"-20
    		1 3/4"3/4"SAE Grade 5
    		Fully Threaded000000000000000000000
    5/8"-11
    		2 1/8"13/16"SAE Grade 5
    		Fully Threaded000000000000000000000
    5/8"-18
    		2 1/8"13/16"SAE Grade 5
    		Fully Threaded000000000000000000000
    3/4"-10
    		2 1/4"1"SAE Grade 5
    		Fully Threaded000000000000000000000
    3/4"-16
    		2 1/4"1"SAE Grade 5
    		Fully Threaded00000000000000000000000
    7/8"-9
    		2 1/2"1 1/4"SAE Grade 5
    		Fully Threaded000000000000000000000000
    7/8"-14
    		2 1/2"1 1/4"SAE Grade 5
    		Fully Threaded000000000000000000000000
    1"-8
    		2 3/4"1 3/8"SAE Grade 5
    		Fully Threaded000000000000000000000000
    1"-14
    		2 3/4"1 3/8"SAE Grade 5
    		Fully Threaded000000000000000000000000
    1 1/8"-7
    		3"1 1/2"SAE Grade 5
    		Fully Threaded000000000000000000000000
    1 1/4"-7
    		3"1 5/8"SAE Grade 5
    		Fully Threaded000000000000000000000000
    1 1/2"-6
    		3 1/2"2"SAE Grade 5
    		Fully Threaded000000000000000000000000
     
    Hot-Dipped Galvanized Steel
    3/4"-10
    		2 1/4"1"SAE Grade 5
    		Fully Threaded000000000000000000000000
    1"-8
    		2 3/4"1 3/8"SAE Grade 5
    		Fully Threaded000000000000000000000000
    1 1/4"-7
    		3"1 5/8"SAE Grade 5
    		Fully Threaded000000000000000000000000
     
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