McMaster-Carr logo
    Filter by
    Nut Type
    Fastener Strength Grade/Class
    Industrial Info Snippet
    Material
    System of Measurement
    Thread Direction
    Thread Type
    Industrial Info Compare
    Thread Spacing
    Industrial Info Compare
    Sight Hole Diameter
    Fastener Strength Rating
    Coupling Nut Profile
    Drive Style
    Industrial Info Snippet
    DFARS Specialty Metals
    Export Control Classification Number (ECCN)
    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)
    12 Products

    Coupling Nuts with Sight Hole

    Image of Product. Front orientation. Coupling Nuts. Coupling Nuts with Sight Hole.
    Confirm that threads are fastened to the right depth at a glance. If you see threads through the sight hole, you'll know that they are properly engaged to ensure a strong hold. Also known as extension nuts, these are commonly used to connect lengths of threaded rod and join threaded parts.
    Low-Strength Steel
    Rated Grade 2 or lower, these are about half as strong as medium-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.
    Each
    Thread
    Size
    Lg.
    Wd.
    Fastener Strength
    Grade/Class
    Threading
    Sight Hole
    Dia.
    1-9
    10-Up
    Zinc-Plated Steel
    8-32
    		5/8"5/16"SAE Grade 2
    		Fully Threaded1/16"0000000000000000000
    10-24
    		3/4"5/16"SAE Grade 2
    		Fully Threaded5/64"00000000000000000
    10-32
    		3/4"5/16"SAE Grade 2
    		Fully Threaded5/64"00000000000000000
    1/4"-20
    		3/4"3/8"SAE Grade 2
    		Fully Threaded3/32"00000000000000000
    1/4"-28
    		3/4"3/8"SAE Grade 2
    		Fully Threaded3/32"00000000000000000
    5/16"-18
    		15/16"1/2"SAE Grade 2
    		Fully Threaded3/32"00000000000000000
    3/8"-16
    		1 1/8"9/16"SAE Grade 2
    		Fully Threaded1/8"00000000000000000
    3/8"-24
    		1 1/8"9/16"SAE Grade 2
    		Fully Threaded1/8"00000000000000000
    1/2"-13
    		1 1/2"3/4"SAE Grade 2
    		Fully Threaded3/16"00000000000000000
    5/8"-11
    		1 7/8"15/16"SAE Grade 2
    		Fully Threaded3/16"00000000000000000
    3/4"-10
    		2 1/4"1 1/8"SAE Grade 2
    		Fully Threaded3/16"00000000000000000
    1"-8
    		3"1 1/2"SAE Grade 2
    		Fully Threaded1/4"0000000000000000000
     
    back to top