McMaster-Carr logo
    Filter by
    Fastener Strength Grade/Class
    Industrial Info Snippet
    Material
    System of Measurement
    Hex Nut Profile
    Industrial Info Compare
    Thread Direction
    Thread Type
    Specifications Met
    Thread Spacing
    Industrial Info Compare
    Thread Fit
    Industrial Info Snippet
    Attribute Image
    Fastener Strength Rating
    DFARS Specialty Metals
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    Container Type
    Cap Nut Profile
    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)
    20 Products
    About Hex Nuts
    industrial info icon

    Choose a hex nut with the right profile, material, and strength for your application.

    High-Profile Hex Nuts

    Image of Product. Front orientation. Hex Nuts. High-Profile Hex Nuts.
    Slightly taller than standard-profile hex nuts, these have a larger gripping area so your wrench or socket won't slip off as you tighten them. They're often used in vehicles and machinery where fasteners can be difficult to reach.
    Low-Strength Steel
    Rated Grade 2, Class 6, or lower, these nuts are about half as strong as medium-strength nuts. They are suitable for light duty fastening applications, such as securing access panels. Use them with screws that have a similar 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.
    Thread Size
    Wd.,
    mm
    Ht.,
    mm
    Fastener Strength
    Grade/Class
    Pkg.
    Qty.
    Pkg.
    Zinc-Plated Steel
    M2 × 0.4 mm42ISO Class 6
    		25000000000000000
    M2.5 × 0.45 mm52.5ISO Class 6
    		2500000000000000
    M3 × 0.5 mm5.53ISO Class 6
    		500000000000000
    M4 × 0.7 mm74ISO Class 6
    		500000000000000
    M5 × 0.8 mm85ISO Class 6
    		500000000000000
     

    Hex Nut Assortments

    Image of Product. Front orientation. Hex Nuts. Hex Nut Assortments.
    Image of Product. Front orientation. Hex Nuts. Hex Nut Assortments.
    With a range of sizes on hand, you can use these assortments to fasten a variety of machinery and equipment.
    Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.
    Sizes
    Included
    No. of
    Pieces
    Specs.
    Met
    Container
    Type
    Each
    Zinc-Plated Steel ISO Class 6, ISO Class 8
    M3 to M20720DIN 934Plastic Box0000000000000000
     

    Spring-Stop Locknuts

    Image of Product. Front orientation. Locknuts. Spring-Stop Locknuts.
    These locknuts withstand heavy vibration similar to distorted-thread nuts, and you can use them over and over. The prongs at the top bend when tightened to create tension for a secure hold. As you remove the locknut, the prongs spring back to their original shape, so you can install the nut again without losing holding power. Also known as Fuji locknuts.
    Low-Strength Steel
    Rated Grade 2, Class 6, or lower, these locknuts are about half as strong as medium-strength steel nuts. Use them with screws that have a similar 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.
    Thread Size
    Wd.,
    mm
    Ht.,
    mm
    Fastener Strength
    Grade/Class
    Pkg.
    Qty.
    Pkg.
    Zinc-Plated Steel
    M5 × 0.8 mm84.6ISO Class 6
    		10000000000000000
    M6 × 1 mm105.1ISO Class 6
    		1000000000000000
    M8 × 1.25 mm127.3ISO Class 6
    		1000000000000000
    M10 × 1.25 mm148.5ISO Class 6
    		50000000000000
    M10 × 1.5 mm178.5ISO Class 6
    		1000000000000000
    M12 × 1.25 mm1710.4ISO Class 6
    		10000000000000
     

    Nylon-Insert Cap Nuts

    Get the protection of a cap nut with the vibration resistance of a locknut. These nuts not only conceal protruding screw threads, they also have a nylon insert that grips the screw to prevent loosening from moderate vibration. However, the insert may become brittle if exposed to high temperatures. Nuts are reusable a handful of times, but their holding power decreases with each use.
    Low-Strength Steel
    Image of Product. Bottom orientation. Cap Nuts. Nylon-Insert Cap Nuts.
    Rated Grade 2, Class 6, or lower, these nuts are about half as strong as medium-strength steel nuts. Use them with screws that have a similar 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.
    Thread Size
    Thread
    Dp., mm
    Wd.,
    mm
    Ht.,
    mm
    Fastener Strength
    Grade/Class
    Specs.
    Met
    Insert Max.
    Temp., ° F
    Pkg.
    Qty.
    Pkg.
    Zinc-Plated Steel
    M4 × 0.7 mm2.379.6ISO Class 6
    		DIN 98624550000000000000000
    M5 × 0.8 mm3.5810.5ISO Class 6
    		DIN 986245250000000000000
    M6 × 1 mm3.91012ISO Class 6
    		DIN 986245250000000000000
    M8 × 1.25 mm5.21314ISO Class 6
    		DIN 9862452500000000000000
    M10 × 1.5 mm6.41618ISO Class 6
    		DIN 986245100000000000000
    M12 × 1.75 mm8.31823ISO Class 6
    		DIN 98624550000000000000
    M16 × 2 mm11.32428ISO Class 6
    		DIN 98624510000000000000
    M20 × 2.5 mm13.53035ISO Class 6
    		DIN 98624510000000000000
     
    back to top