McMaster-Carr logo
    Filter by
    System of Measurement
    Material
    Thread Type
    Thread Spacing
    Industrial Info Snippet
    Barrel Height
    Hole Diameter
    Collar Height
    Number of Projections
    Base Diameter
    Attribute Image
    Thread Direction
    Specifications Met
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    Barrel Diameter
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    DFARS Specialty Metals
    Industrial Info Compare
    Base Length
    Attribute Image
    Base Thickness
    Attribute Image
    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)
    10 Products

    Weld Nuts

    Image of Product. Top orientation. Weld Nuts. Weld Nuts.
    Image of Product. Bottom orientation. Weld Nuts. Weld Nuts.
    Add permanent threads to thin metal with our go-to weld nuts. Unlike press-fit and rivet nuts, these nuts fuse to the base metal, so they won’t twist and pull out. Three evenly spaced projections concentrate heat away from the threads to prevent them from deforming and create consistent welds. All have a collar pilot that guides the nut into the hole, holds it in place while welding, and protects the threads from weld spatter. You can also install them on thick pieces of metal.
    Steel—Best for dry environments since moisture will cause them to rust. Made of uncoated steel, these nuts require minimal prep. Weld them to uncoated steel surfaces.
    Collar
    Thread
    Size
    Wd.
    Ht.
    Dia.
    Ht.
    For Hole
    Dia.
    Specs.
    Met
    Certificate Type
    Pkg.
    Qty.
    Pkg.
    Steel
    5/8"-11
    		15/16"29/64"25/32"0.06"51/64"ASME B1.1Material Certificate
    		1093560A280000000
    5/8"-11
    		15/16"29/64"25/32"0.085"51/64"ASME B1.1—1093560A11100000
     

    Square Weld Nuts

    Image of Product. Bottom orientation. Weld Nuts. Square Weld Nuts.
    Image of Product. Bottom orientation. Weld Nuts. Square Weld Nuts.
    With four symmetrical projections, these nuts create the strongest hold in our offering. Unlike rectangular weld nuts, each projection is equidistant from the threads, so welds wrap evenly for extra strength and twist resistance. Projections concentrate heat away from the threads to prevent them from deforming and create consistent welds. All nuts have a collar pilot that guides them into the hole, holds them in place while welding, and protects the threads from weld spatter.
    Steel—Best for dry environments since moisture will cause them to rust. Made of uncoated steel, these nuts require minimal prep. Weld them to uncoated steel surfaces.
    Material Certificate Icon
    Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
    Collar
    Thread
    Size
    Wd.
    Ht.
    Dia.
    Ht.
    For Hole
    Dia.
    Specs.
    Met
    Certificate Type
    Pkg.
    Qty.
    Pkg.
    Steel
    5/8"-11
    		7/8"7/16"25/32"0.094"51/64"ASME B1.1Material Certificate
    		2593975A450000000
     

    Long-Barrel Round Weld Nuts

    Image of Product. Bottom orientation. Weld Nuts. Long-Barrel Round Weld Nuts.
    Image of Product. Bottom orientation. Weld Nuts. Long-Barrel Round Weld Nuts.
    With an extended barrel and a round flange, these nuts distribute force evenly to prevent pull-through. The barrel is twice as long as standard round weld nuts, so more threads connect with your bolt for a great grip. You can weld these nuts in two orientations: on top of a flat surface or with the barrel sticking through the hole.
    Steel—Best for dry environments since moisture will cause them to rust. Made of uncoated steel, these nuts require minimal prep. Weld them to uncoated steel surfaces.
    Zinc-Plated Steel—A step up from plain steel, these nuts withstand occasional exposure to moisture. Weld them to uncoated steel surfaces. If MIG or TIG welding, grind the zinc plating off the part of the nut you intend to weld.
    Number of Projections—Weld these nuts on top of metal—the projections on the bottom will fuse to the surface. More projections lead to more consistent welds by concentrating heat and protecting the threads from deforming.
    Base
    Barrel
    Thread
    Size
    No. of
    Projections
    Dia.
    Thk.
    Dia.
    Ht.
    Pkg.
    Qty.
    Pkg.
    Steel
    5/8"-11
    		01 7/16"3/32"23/32"3/8"1090596A039000000
     
    Zinc-Plated Steel
    5/8"-11
    		01 7/16"3/32"23/32"3/8"1090596A33000000
     

    Rectangular Weld Nuts

    Image of Product. Bottom orientation. Weld Nuts. Rectangular Weld Nuts.
    Image of Product. Bottom orientation. Weld Nuts. Rectangular Weld Nuts.
    These nuts add permanent threads in narrow spaces such as channels. With a slim footprint, they fit where round weld nuts can’t. Plus, their barrel is twice as long as low-profile barrels, so more threads connect with your bolt for a secure hold. You can weld these nuts in two orientations: on top of a flat surface or with the barrel sticking through a hole.
    Steel—Best for dry environments since moisture will cause them to rust. Made of uncoated steel, these nuts require minimal prep. Weld them to uncoated steel surfaces.
    Number of Projections—Weld these nuts on top of metal—the projections on the bottom will fuse to the surface. More projections lead to more consistent welds by concentrating heat and protecting the threads from deforming.
    Base
    Barrel
    Thread
    Size
    No. of
    Projections
    Lg.
    Wd.
    Thk.
    Dia.
    Ht.
    Pkg.
    Qty.
    Pkg.
    Steel
    5/8"-11
    		01 7/16"7/8"3/32"23/32"3/8"1090594A420000000
     

    Weld Locknuts

    Image of Product. Bottom orientation. Weld Nuts. Weld Locknuts.
    Image of Product. Bottom orientation. Weld Nuts. Weld Locknuts.
    Prevent screws from backing out under heavy vibration. These nuts have distorted threads that grip screws tightly. Three evenly spaced projections concentrate heat away from the threads to prevent them from deforming and create consistent welds. These nuts also have a collar pilot that guides the nut into the hole, holds it in place while welding, and protects the threads from weld spatter.
    Use Grade 2 or Class 6 screws to avoid stripping threads during installation. Distorted threads require high torque for fastening and unfastening, so you may need an impact wrench to remove screws.
    Steel—Best for dry environments since moisture will cause them to rust. Made of uncoated steel, these nuts require minimal prep. Weld them to uncoated steel surfaces.
    Collar
    Thread
    Size
    Wd.
    Ht.
    Dia.
    Ht.
    For Hole
    Dia.
    Pkg.
    Qty.
    Pkg.
    Steel
    5/8"-11
    		59/64"27/64"25/32"0.085"51/64"2590744A290000000
    5/8"-11
    		15/16"7/16"25/32"0.085"51/64"590744A2300000
     

    Screw-Mount Nuts

    Image of Product. Front orientation. Screw-Mount Nuts. Screw-Mount Nuts, Style A.
    Image of Product. Front orientation. Screw-Mount Nuts. Screw-Mount Nuts, Style B.

    Style A

    Style B

    These screw-mount nuts have three mounting holes to accept screws and rivets. Insert the barrel through a hole or fasten the base with the barrel facing upward for use with thin materials. Since the base is flanged, it helps spread out the load. A larger base means more room for weight to spread. The longer the barrel, the more thread engagement with your screw.
    Style B—Style B nuts can also be welded for a stronger, permanent hold. The three projections on their base concentrate your weld and create room for heat to dissipate, protecting threads from deforming.
    Base
    Barrel
    Style
    Thread
    Size
    Dia.
    Thk.
    Dia.
    Ht.
    No. of Mounting
    Holes
    Mounting
    Hole Dia.
    No. of
    Projections
    Pkg.
    Qty.
    Pkg.
    Steel
    A5/8"-11
    		1 7/16"3/32"23/32"3/8"35/32"—1090611A121000000
    B5/8"-11
    		1 7/16"3/32"23/32"3/8"35/32"31090611A12600000
     
    back to top