McMaster-Carr logo
    Filter by
    Nut Type
    Fastener Strength Grade/Class
    Material
    System of Measurement
    Fastener Strength Rating
    Thread Direction
    Thread Spacing
    Industrial Info Compare
    Coupling Nut Profile
    Thread Type
    Industrial Info Compare
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    DFARS Specialty Metals
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    Drive Style
    Industrial Info Snippet
    Forward
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Print
    How can we improve?
    Comments
    E-mail address (if you would like a response)
    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 Threaded90977A013000000000000000
    10-24
    		3/4"1/2"SAE Grade 5
    		Fully Threaded90977A017000000000000
    10-32
    		3/4"1/2"SAE Grade 5
    		Fully Threaded90977A021000000000000
    1/4"-20
    		7/8"1/2"SAE Grade 5
    		Fully Threaded90977A130000000000000
    1/4"-28
    		7/8"1/2"SAE Grade 5
    		Fully Threaded90977A140000000000000
    5/16"-18
    		1 1/8"1/2"SAE Grade 5
    		Fully Threaded90977A150000000000000
    5/16"-24
    		1 1/8"1/2"SAE Grade 5
    		Fully Threaded90977A160000000000000
    3/8"-16
    		1 3/4"5/8"SAE Grade 5
    		Fully Threaded90977A165000000000000
    3/8"-24
    		1 3/4"5/8"SAE Grade 5
    		Fully Threaded90977A170000000000000
    7/16"-14
    		1 3/4"5/8"SAE Grade 5
    		Fully Threaded90977A180000000000000
    7/16"-20
    		1 3/4"5/8"SAE Grade 5
    		Fully Threaded90977A190000000000000
    1/2"-13
    		1 3/4"3/4"SAE Grade 5
    		Fully Threaded90977A195000000000000
    1/2"-20
    		1 3/4"3/4"SAE Grade 5
    		Fully Threaded90977A034000000000000
    5/8"-11
    		2 1/8"13/16"SAE Grade 5
    		Fully Threaded90977A205000000000000
    5/8"-18
    		2 1/8"13/16"SAE Grade 5
    		Fully Threaded90977A210000000000000
    3/4"-10
    		2 1/4"1"SAE Grade 5
    		Fully Threaded90977A215000000000000
    3/4"-16
    		2 1/4"1"SAE Grade 5
    		Fully Threaded90977A22000000000000000
    7/8"-9
    		2 1/2"1 1/4"SAE Grade 5
    		Fully Threaded90977A037000000000000000
    7/8"-14
    		2 1/2"1 1/4"SAE Grade 5
    		Fully Threaded90977A225000000000000000
    1"-8
    		2 3/4"1 3/8"SAE Grade 5
    		Fully Threaded90977A038000000000000000
    1"-14
    		2 3/4"1 3/8"SAE Grade 5
    		Fully Threaded90977A230000000000000000
    1 1/8"-7
    		3"1 1/2"SAE Grade 5
    		Fully Threaded90977A235000000000000000
    1 1/4"-7
    		3"1 5/8"SAE Grade 5
    		Fully Threaded90977A240000000000000000
    1 1/2"-6
    		3 1/2"2"SAE Grade 5
    		Fully Threaded90977A245000000000000000
     
    Hot-Dipped Galvanized Steel
    3/4"-10
    		2 1/4"1"SAE Grade 5
    		Fully Threaded90977A261000000000000000
    1"-8
    		2 3/4"1 3/8"SAE Grade 5
    		Fully Threaded90977A262000000000000000
    1 1/4"-7
    		3"1 5/8"SAE Grade 5
    		Fully Threaded90977A263000000000000000
     
    back to top