McMaster-Carr logo
    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)
    28 Products
    About Hex Nuts
    industrial info icon

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

    Hex Nut Profile

    Performance

    Certificate Type

    Mil. Spec. Narrow-Profile Hex Nuts

    These nuts are manufactured and tested to strict U.S. military standards for material and construction. They are about 20% narrower to fit in tight spots where standard-profile nuts won't fit. Also known as small-pattern hex nuts.
    Corrosion-Resistant Stainless Steel
    Image of Product. Bottom orientation. Hex Nuts. Mil. Spec. Narrow-Profile Hex 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.
    Thread
    Size
    Wd.
    Ht.
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel
    0-80
    		1/8"3/64"Fed. Spec. FF-N-836, NAS671C01091834A106000000
    2-56
    		5/32"1/16"Fed. Spec. FF-N-836, NAS671C21091834A10100000
    4-40
    		3/16"1/16"Fed. Spec. FF-N-836, NAS671C41091834A10200000
    6-32
    		1/4"3/32"Fed. Spec. FF-N-836, NAS671C61091834A10300000
    8-32
    		5/16"7/64"Fed. Spec. FF-N-836, NAS671C81091834A10400000
    10-32
    		11/32"1/8"Fed. Spec. FF-N-836, NAS671C10591834A10500000
     

    Mil. Spec. Hex Nuts

    These nuts are manufactured and tested to strict U.S. military standards for material and construction.
    Low-Strength Steel
    Image of Product. Front orientation. Hex Nuts. Mil. Spec. Hex Nuts.
    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.
    Cadmium Yellow-Chromate-Plated Steel— The plating creates a barrier against rust, so these nuts are suitable for most wet and outdoor environments. They also thread on smoothly without sticking.
    Thread
    Size
    Wd.
    Ht.
    Mil. Spec.
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Cadmium Yellow-Chromate-Plated Steel
    2-56
    		3/16"1/16"MS35649-222Fed. Spec. FF-N-836
    		1091813A110000000
    4-40
    		1/4"3/32"MS35649-242Fed. Spec. FF-N-836
    		5091813A12000000
    6-32
    		5/16"7/64"MS35649-262Fed. Spec. FF-N-836
    		1091813A1300000
    8-32
    		11/32"1/8"MS35649-282Fed. Spec. FF-N-836
    		5091813A14000000
    10-24
    		3/8"1/8"MS35649-202Fed. Spec. FF-N-836
    		5091813A15000000
    10-32
    		3/8"1/8"MS35650-302Fed. Spec. FF-N-836
    		5091813A16000000
    1/4"-20
    		7/16"3/16"MS35649-2252Fed. Spec. FF-N-836
    		5091813A17000000
    5/16"-18
    		9/16"7/32"MS35649-2312Fed. Spec. FF-N-836
    		2591813A18000000
    3/8"-16
    		5/8"1/4"MS35649-2382Fed. Spec. FF-N-836
    		2591813A19000000
     
    Corrosion-Resistant Stainless Steel
    Image of Product. Front orientation. Hex Nuts. Mil. Spec. Hex 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.
    Thread
    Size
    Wd.
    Ht.
    Mil. Spec.
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel
    0-80
    		5/32"3/64"MS35650-314Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35
    		591240A00100000
    4-40
    		1/4"3/32"MS35649-244Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35
    		2591240A00500000
    6-32
    		5/16"7/64"MS35649-264Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35
    		2591240A00700000
    8-32
    		11/32"1/8"MS35649-284Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35
    		1091240A0090000
    10-24
    		3/8"1/8"MS35649-204Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35
    		1091240A0110000
    10-32
    		3/8"1/8"MS35650-304Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35
    		1091240A4110000
    1/4"-20
    		7/16"3/16"MS35649-2254Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35
    		1091240A0290000
    1/4"-28
    		7/16"3/16"MS35650-3254Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35
    		591240A0780000
    5/16"-18
    		9/16"7/32"MS35649-2314Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35
    		591240A0300000
    5/16"-24
    		9/16"7/32"MS35650-3314Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35
    		191240A5110000
    3/8"-16
    		5/8"1/4"MS35649-2384Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35
    		591240A0310000
    3/8"-24
    		5/8"1/4"MS35650-3384Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35
    		191240A5120000
     
    Corrosion-Resistant Stainless Steel with Material Certificate
    Image of Product. Front orientation. Hex Nuts. Mil. Spec. Hex 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.
    Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
    Thread
    Size
    Wd.
    Ht.
    Mil. Spec.
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel
    2-56
    		3/16"1/16"MS35649-224Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35
    		2591240A003000000
     
    back to top