McMaster-Carr logo
    Filter by
    System of Measurement
    Thread Size
    Industrial Info Snippet
    Thread Pitch
    Industrial Info Snippet
    Attribute Image
    Thread Type
    Width
    Attribute Image
    Cap Nut Profile
    Industrial Info Snippet
    Thread Spacing
    Industrial Info Snippet
    Thread Fit
    Industrial Info Snippet
    Drive Style
    Industrial Info Snippet
    Industrial Info Snippet
    Specifications Met
    Maximum Temperature
    Minimum Temperature
    Insert Maximum Temperature
    Fastener Strength Grade/Class
    Industrial Info Snippet
    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)
    7 Products

    Cap Nuts
    3D CAD models available

    Conceal and protect protruding screw threads while fastening parts together. These nuts help prevent damage to surrounding materials and reduce injuries. Also known as acorn nuts, they have a smooth, rounded head that creates a finished look.
    Corrosion-Resistant Stainless Steel
    Image of Product. Front orientation. Cap Nuts. Cap Nuts.
    18-8 Stainless Steel—The choice for wet and outdoor environments, these nuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.
    Super-Corrosion-Resistant 316 Stainless Steel—Our most corrosion-resistant cap nuts, these hold up in just about any environment. They won't degrade from exposure to weather, salt water, and most chemicals.
    Thread
    Size
    Dp.,
    mm
    Wd.,
    mm
    Ht.,
    mm
    Specs.
    Met
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel
    M4 × 0.7 mm5.778DIN 15872500000000000000
     
    Super-Corrosion-Resistant 316 Stainless Steel
    M4 × 0.7 mm5.578DIN 1587250000000000000
     
    Low-Strength Steel
    Image of Product. Front orientation. Cap Nuts. Cap Nuts.
    Rated Grade 2, Class 6, or lower, these nuts are about half as strong as medium-strength steel 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.
    Chrome-Plated Steel—The brightest, shiniest finish we offer, this plating has a mirror-like appearance that is often used in decorative applications. It resists salt water and chemicals better than zinc plating and is less likely to wear off.
    Thread
    Size
    Dp.,
    mm
    Wd.,
    mm
    Ht.,
    mm
    Specs.
    Met
    Pkg.
    Qty.
    Pkg.
    Zinc-Plated Steel
    M4 × 0.7 mm5.378DIN 158750000000000000000
     
    Chrome-Plated Steel
    M4 × 0.7 mm3.978DIN 1587500000000000000
     
    Plastic
    Image of Product. Front orientation. Cap Nuts. Cap Nuts.
    Nylon 6/6—Slippery and abrasion resistant, these nuts thread on smoothly and stand up to daily wear and tear. Nylon will swell and weaken when exposed to moisture, so it's best for dry environments.
    Thread
    Size
    Wd.,
    mm
    Ht.,
    mm
    Temp. Range,
    ° F
    Choose a Color
    Pkg.
    Qty.
    Pkg.
    Nylon 6/6
    M4 × 0.7 mm78-40 to 185
    Black
    ,
    Off-White
    		100000000000000000
     
    Brass
    Image of Product. Front orientation. Cap Nuts. Cap Nuts.
    Brass—Conductive and nonmagnetic, brass nuts are commonly used to secure electrical equipment, such as circuit board assemblies and mounting brackets, inside enclosures. They're also softer than most metals, so they won't damage other fastening components.
    Thread
    Size
    Dp.,
    mm
    Wd.,
    mm
    Ht.,
    mm
    Pkg.
    Qty.
    Pkg.
    Brass
    M4 × 0.7 mm5.578500000000000000
     

    Nylon-Insert Cap Nuts
    3D CAD models available

    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. Front 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
    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
     
    back to top