McMaster-Carr logo
    Filter by
    System of Measurement
    Thread Type
    Industrial Info Compare
    Specifications Met
    Retainer Material
    Thread Direction
    Number of Projections
    DFARS Specialty Metals
    Industrial Info Compare
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    Thread Spacing
    Industrial Info Compare
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Comments
    E-mail address (if you would like a response)
    108 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.
    18-8 Stainless Steel—Suitable for outdoor use, these nuts resist rust from water and mild chemicals. Weld them to stainless steel surfaces.
    Collar
    Thread Size
    Wd.
    Ht.
    Dia.
    Ht.
    For Hole
    Dia.
    Specs.
    Met
    Certificate Type
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel
    1/4"-20
    1/2"3/16"13/32"0.047"27/64"ASME B1.1Material Certificate
    1095508A10000000
    1/4"-28
    1/2"3/16"13/32"0.04"27/64"ASME B1.11095508A4000000
    5/16"-18
    9/16"7/32"15/32"0.047"31/64"ASME B1.1Material Certificate
    595508A2000000
    3/8"-16
    5/8"1/4"17/32"0.047"35/64"ASME B1.1Material Certificate
    595508A3000000
    1/2"-13
    13/16"3/8"23/32"0.06"47/64"ASME B1.1Material Certificate
    595508A50000000
    M3 × 0.5 mm7.5 mm2.5 mm4.5 mm0.55 mm4.5 mmDIN 92910093418A20000000
    M4 × 0.7 mm9 mm2.9 mm6 mm0.65 mm6 mmDIN 9295093418A3000000
    M5 × 0.8 mm10 mm3.3 mm7 mm0.7 mm7 mmDIN 929Material Certificate
    5093418A40000000
    M6 × 1 mm11 mm4.3 mm8 mm0.75 mm8 mmDIN 929Material Certificate
    2593418A5000000
    M8 × 1.25 mm14 mm5.6 mm10.5 mm0.9 mm10.5 mmDIN 929Material Certificate
    2593418A60000000
    M10 × 1.5 mm17 mm6.9 mm12.5 mm1.15 mm12.5 mmDIN 929Material Certificate
    1093418A7000000
    M12 × 1.75 mm19 mm8.6 mm14.8 mm1.4 mm14.8 mmDIN 9291093418A80000000
    M16 × 2 mm24 mm11.2 mm18.8 mm1.8 mm18.8 mmDIN 929193418A90000000
     

    Low-Profile Rectangular Weld Nuts

    Image of Product. Bottom orientation. Weld Nuts. Low-Profile Rectangular Weld Nuts.
    Image of Product. Bottom orientation. Weld Nuts. Low-Profile Rectangular Weld Nuts.
    Weld permanent threads in channels and other tight spaces without adding a barrel bump that gets in the way. These nuts have a short barrel that tucks under low surfaces and a slim footprint that fits between narrow channel walls.
    18-8 Stainless Steel—Suitable for outdoor use, these nuts resist rust from water and mild chemicals. Weld them to stainless steel surfaces.
    Number of Projections—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.
    For Hole
    Dia.
    Certificate Type
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel
    8-32
    07/8"7/16"3/32"13/64"1/32"7/32"1092442A160000000
    8-32
    25/8"3/8"3/32"13/64"1/32"7/32"1098697A5100000
    10-24
    07/8"7/16"3/32"15/64"1/32"1/4"1092442A18000000
    10-24
    25/8"3/8"3/32"15/64"1/32"1/4"1098697A5200000
    10-32
    07/8"7/16"3/32"15/64"1/32"1/4"1092442A19000000
    10-32
    25/8"3/8"3/32"15/64"1/32"1/4"1098697A5300000
    1/4"-20
    01"7/16"3/32"19/64"1/32"5/16"Material Certificate
    592442A1200000
    1/4"-20
    01 1/8"1/2"1/8"19/64"3/64"5/16"Material Certificate
    592442A1500000
    1/4"-20
    213/16"1/2"1/8"19/64"1/16"5/16"Material Certificate
    1098697A54000000
    1/4"-28
    213/16"1/2"1/8"19/64"1/16"19/64"Material Certificate
    1098697A77000000
    5/16"-18
    01 1/2"5/8"9/64"23/64"5/64"3/8"592442A14000000
    5/16"-18
    263/64"5/8"9/64"23/64"3/32"3/8"598697A5500000
    5/16"-24
    263/64"5/8"9/64"23/64"5/8"23/64"598697A7800000
    3/8"-16
    01 1/2"5/8"9/64"7/16"3/32"29/64"592442A13000000
    3/8"-16
    263/64"5/8"9/64"7/16"3/32"29/64"598697A5600000
    3/8"-24
    263/64"5/8"9/64"7/16"3/32"7/16"598697A7900000
    1/2"-13
    01 1/2"51/64"5/32"19/32"3/32"39/64"192442A2200000
    1/2"-13
    21 1/8"3/4"5/32"37/64"3/32"37/64"598697A80000000
    M4 × 0.7 mm216 mm9.6 mm2.4 mm5.2 mm0.8 mm5.2 mm1098697A8100000
    M5 × 0.8 mm022.4 mm11.3 mm2.5 mm6.2 mm0.8 mm6.6 mm1092442A2300000
    M5 × 0.8 mm216 mm9.6 mm2.4 mm6 mm0.8 mm6 mm1098697A8200000
    M6 × 1 mm028.5 mm13 mm3.2 mm7.6 mm1.2 mm8 mm592442A21000000
    M6 × 1 mm220.5 mm13 mm3.2 mm7.6 mm1.2 mm7.6 mmMaterial Certificate
    1098697A83000000
    M8 × 1.25 mm038 mm16 mm3.6 mm9.2 mm2 mm9.6 mm592442A17000000
    M8 × 1.25 mm225 mm16 mm3.6 mm9.2 mm2 mm9.2 mm598697A8400000
    M10 × 1.5 mm038 mm16 mm3.6 mm11.8 mm2.4 mm12.2 mm592442A11000000
     

    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.
    18-8 Stainless Steel—Suitable for outdoor use, these nuts resist rust from water and mild chemicals. Weld them to stainless 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.
    Certificate Type
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel
    4-40
    09/16"9/32"1/32"9/64"1/8"Material Certificate
    2590572A102000000
    6-32
    09/16"9/32"1/32"11/64"1/4"Material Certificate
    2590572A10300000
    6-32
    41/2"5/16"5/64"7/32"5/16"192267A1400000
    8-32
    07/16"5/16"1/32"13/64"1/8"590572A1010000
    8-32
    03/4"1/2"3/64"7/32"1/4"Material Certificate
    1090572A1000000
    8-32
    41/2"5/16"5/64"1/4"5/16"Material Certificate
    592267A12000000
    10-24
    03/4"1/2"3/64"15/64"9/32"1090572A20000000
    10-24
    45/8"3/8"3/32"9/32"3/8"592267A15000000
    10-32
    03/4"1/2"3/64"15/64"9/32"1090572A30000000
    10-32
    45/8"3/8"3/32"9/32"3/8"Material Certificate
    592267A13000000
    1/4"-20
    03/4"1/2"1/16"5/16"5/16"Material Certificate
    1090572A40000000
    1/4"-20
    03/4"1/2"1/16"5/16"7/16"1090572A70000000
    1/4"-20
    413/16"1/2"7/64"3/8"1/2"192267A1100000
    5/16"-18
    07/8"9/16"1/16"25/64"3/8"Material Certificate
    590572A50000000
    3/8"-16
    01"21/32"5/64"15/32"7/16"590572A60000000
    M5 × 0.8 mm019.1 mm12.7 mm1 mm6.8 mm7.1 mm190572A2100000
    M6 × 1 mm019.1 mm12.7 mm1.3 mm7.7 mm7.9 mm190572A3100000
    M8 × 1.25 mm022 mm14.3 mm1.5 mm9.9 mm9.5 mmMaterial Certificate
    2590572A41000000
    M10 × 1.5 mm025.4 mm16.7 mm1.9 mm12.3 mm11.1 mm190572A51000000
     

    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.
    18-8 Stainless Steel—Suitable for outdoor use, these nuts resist rust from water and mild chemicals. Weld them to stainless 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
    Dia.
    Thk.
    Dia.
    Ht.
    Certificate Type
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel
    4-40
    03/8"1/32"1/8"1/8"Material Certificate
    2590860A101000000
    6-32
    01/2"1/32"11/64"1/4"Material Certificate
    2590860A10200000
    8-32
    01/2"3/64"7/32"1/4"1090860A10000000
    10-24
    03/4"3/64"15/64"9/32"1090860A10500000
    10-32
    03/4"3/64"15/64"9/32"1090860A10700000
    1/4"-20
    03/4"1/16"5/16"5/16"Material Certificate
    1090860A11000000
    1/4"-20
    03/4"1/16"5/16"3/8"Material Certificate
    1090860A11100000
    1/4"-20
    03/4"1/16"5/16"7/16"1090860A11200000
    1/4"-20
    03/4"1/16"5/16"1/2"Material Certificate
    590860A1130000
    5/16"-18
    07/8"1/16"25/64"3/8"590860A11400000
    5/16"-18
    07/8"1/16"25/64"1/2"590860A11500000
    3/8"-16
    01"5/64"15/32"7/16"590860A12000000
    M6 × 1 mm019 mm1.3 mm7.6 mm11.1 mm590860A10300000
     

    Offset-Barrel Low-Profile Rectangular Weld Nuts

    Image of Product. Bottom orientation. Weld Nuts. Offset-Barrel Low-Profile Rectangular Weld Nuts.
    Image of Product. Bottom orientation. Weld Nuts. Offset-Barrel Low-Profile Rectangular Weld Nuts.
    Add permanent threads on corners and near edges. With a slim base and a short, offset barrel, these weld nuts fit in tight spaces such as channels and low-clearance areas.
    18-8 Stainless Steel—Suitable for outdoor use, these nuts resist rust from water and mild chemicals. Weld them to stainless steel surfaces.
    Number of Projections—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.
    For Hole
    Dia.
    Certificate Type
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel
    8-32
    05/8"3/8"3/32"13/64"1/32"7/32"1094581A117000000
    8-32
    15/8"3/8"3/32"13/64"1/32"7/32"1092413A1100000
    10-24
    05/8"3/8"3/32"15/64"1/32"1/4"1094581A12300000
    10-24
    15/8"3/8"3/32"15/64"1/32"1/4"Material Certificate
    1092413A1200000
    10-32
    05/8"3/8"3/32"15/64"1/32"1/4"Material Certificate
    1094581A12800000
    10-32
    15/8"3/8"3/32"15/64"1/32"1/4"Material Certificate
    1092413A1500000
    1/4"-20
    013/16"1/2"1/8"19/64"1/16"5/16"Material Certificate
    1094581A13200000
    1/4"-20
    113/16"1/2"1/8"19/64"3/64"5/16"592413A1300000
    1/4"-28
    013/16"1/2"1/8"19/64"1/16"5/16"1094581A13600000
    5/16"-18
    01 1/8"5/8"9/64"23/64"3/32"3/8"Material Certificate
    594581A13900000
    5/16"-18
    11 1/8"5/8"9/64"23/64"5/64"3/8"592413A14000000
    5/16"-24
    01 1/8"5/8"9/64"23/64"3/32"3/8"594581A1440000
    3/8"-16
    01 1/8"5/8"9/64"7/16"3/32"29/64"Material Certificate
    594581A14800000
    3/8"-16
    11 1/8"5/8"9/64"7/16"3/32"29/64"592413A16000000
    3/8"-24
    01 1/8"5/8"9/64"7/16"3/32"29/64"594581A1510000
    M4 × 0.7 mm015.9 mm9.6 mm2.4 mm5.2 mm0.8 mm5.6 mm1094581A16100000
    M4 × 0.7 mm115.9 mm9.6 mm2.4 mm5.2 mm0.8 mm5.6 mmMaterial Certificate
    592413A1900000
    M5 × 0.8 mm015.9 mm9.6 mm2.4 mm6 mm0.8 mm6.4 mm1094581A16200000
    M5 × 0.8 mm115.9 mm9.6 mm2.4 mm6 mm0.8 mm6.4 mmMaterial Certificate
    592413A2100000
    M6 × 1 mm020.6 mm12.9 mm3.2 mm7.6 mm1.3 mm8 mm1094581A16400000
    M6 × 1 mm120.6 mm12.9 mm3.2 mm7.6 mm1.3 mm8 mmMaterial Certificate
    592413A1700000
    M8 × 1.25 mm028.6 mm16.15 mm3.6 mm9.2 mm2 mm9.6 mm594581A17100000
    M8 × 1.25 mm128.6 mm16.1 mm3.6 mm9.2 mm2 mm9.6 mm592413A18000000
     

    Round Weld Nuts

    Image of Product. Bottom orientation. Weld Nuts. Round Weld Nuts.
    Image of Product. Bottom orientation. Weld Nuts. Round Weld Nuts.
    With three projections and a short collar, weld these nuts under low-clearance areas without sacrificing strength. The projections concentrate heat away from the threads to prevent them from deforming and create consistent welds. To make welding easier, their collar pilot guides them into the hole and aligns them with the surface while also shielding the threads from weld spatter.
    18-8 Stainless Steel—Suitable for outdoor use, these nuts resist rust from water and mild chemicals. Weld them to stainless steel surfaces.
    Base
    Collar
    Thread
    Size
    Dia.
    Thk.
    Dia.
    Ht.
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel
    4-40
    5/16"1/16"11/64"0.03"2590583A17000000
    6-32
    11/32"3/32"3/16"0.03"2590583A1400000
    8-32
    3/8"7/64"7/32"0.03"2590583A1800000
    10-24
    7/16"5/32"1/4"0.03"1090583A1500000
    10-32
    7/16"5/32"1/4"0.03"1090583A1300000
    1/4"-20
    33/64"3/16"5/16"0.047"1090583A1100000
    M3 × 0.5 mm7.8 mm1.5 mm4.3 mm0.8 mm2590583A1900000
    M4 × 0.7 mm9.4 mm2.6 mm5.5 mm0.8 mm2590583A2100000
    M5 × 0.8 mm11.2 mm3.8 mm6.3 mm0.8 mm1090583A2200000
    M6 × 1 mm13.2 mm4.6 mm8 mm1.2 mm1090583A1200000
     

    Self-Aligning Rectangular Weld Nuts

    Image of Product. Bottom orientation. Weld Nuts. Self-Aligning Rectangular Weld Nuts.
    Image of Product. Bottom orientation. Weld Nuts. Self-Aligning Rectangular Weld Nuts.
    Help screws pass through perfectly every time. These nuts float inside a rectangular retainer that shifts and tilts to compensate for misalignment. A pilot tip locates the hole, and the retainer holds the nut in place during welding.
    18-8 Stainless Steel with Stainless Steel Retainer—Suitable for outdoor use, both the nut and its retainer resist rust from water and mild chemicals. Weld them to stainless 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.
    Base
    Thread
    Size
    Lg.
    Wd.
    Thk.
    Ht.
    Certificate Type
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel with Stainless Steel Retainer
    1/4"-20
    1 3/4"9/16"1/16"11/32"Material Certificate
    190955A135000000
     

    Corner Weld Nuts

    Image of Product. Bottom orientation. Weld Nuts. Corner Weld Nuts.
    Image of Product. Bottom orientation. Weld Nuts. Corner Weld Nuts.
    Create permanent, threaded 90° joints in sheet metal. Shaped like corner brackets, they’re often used to add mounting brackets in assemblies such as motors and heaters. These nuts have two projections that concentrate heat away from the threads to prevent them from deforming and create consistent welds.
    18-8 Stainless Steel—Suitable for outdoor use, these nuts resist rust from water and mild chemicals. Weld them to stainless steel surfaces.
    Base
    Barrel
    Thread
    Size
    Lg.
    (A)
    Lg.
    (B)
    Wd.
    Thk.
    Dia.
    Ht.
    For Hole
    Dia.
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel
    10-24
    19/32"21/32"1/2"1/8"13/64"590536A11000000
    10-32
    19/32"21/32"1/2"1/8"13/64"590536A12000000
    5/16"-18
    1"1"5/8"5/32"23/64"5/64"23/64"590536A13000000
     
    back to top