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    193 Products

    Serrated Flange Nuts

    Serrations bite into material for mild vibration resistance while the flange eliminates the need for a separate washer. These nuts are ideal for securing screws in oversized or irregularly shaped holes since the flange covers a larger area than standard nuts. You can use them again and again without sacrificing strength. However, the serrations may mar the surface of your material. Also known as collar nuts.
    Medium-Strength Steel
    Image of Product. Bottom orientation. Flange Nuts. Serrated Flange Nuts.
    Rated Grade 5, Grade F, or Class 8, these nuts are your go-to for fastening most machinery and equipment. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.
    Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.
    Zinc-Yellow-Chromate-Plated Steel—With a more durable finish than clear zinc plating, these nuts are suitable for most wet and outdoor environments. However, they won't hold up to the harsh chemicals that stainless steel can.
    Black-Oxide Steel—Typically chosen for their appearance, these nuts have a dark, matte coating that creates a finished look. They offer minimal corrosion resistance, so they're best for dry environments.
    Steel—Best for dry environments since moisture will cause these nuts to rust.
    Flange
    Thread Size
    Wd.
    Ht.
    Dia.
    Thk.
    Fastener Strength
    Grade/Class
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Zinc-Plated Steel
    1/4"-20
    7/16"15/64"19/32"0.04"SAE Grade 5
    10000000000000000
    1/4"-28
    7/16"15/64"19/32"0.04"SAE Grade 5
    1000000000000000
    5/16"-18
    1/2"9/32"11/16"0.04"SAE Grade 5
    10000000000000000
    5/16"-24
    1/2"9/32"11/16"0.04"SAE Grade 5
    10000000000000000
    3/8"-16
    9/16"11/32"3/4"0.04"SAE Grade 5
    10000000000000000
    3/8"-24
    9/16"11/32"3/4"0.04"SAE Grade 5
    10000000000000000
    7/16"-14
    11/16"3/8"59/64"0.04"SAE Grade 5
    10000000000000000
    7/16"-20
    11/16"3/8"59/64"0.04"SAE Grade 5
    10000000000000000
    1/2"-13
    3/4"29/64"1 1/32"0.05"SAE Grade 5
    5000000000000000
    1/2"-20
    3/4"7/16"1"0.05"SAE Grade 5
    5000000000000000
    5/8"-11
    59/64"35/64"1 1/4"0.05"SAE Grade 5
    2500000000000000
    5/8"-18
    59/64"35/64"1 1/4"0.05"SAE Grade 5
    2500000000000000
    3/4"-10
    1 3/32"41/64"1 15/32"0.06"SAE Grade 5
    1000000000000000
    3/4"-16
    1 3/32"41/64"1 15/32"0.06"SAE Grade 5
    1000000000000000
    M3 × 0.5 mm5.5 mm4 mm8 mm0.7 mmISO Class 8
    DIN 6923, ISO 41611000000000000000
    M4 × 0.7 mm7 mm4.6 mm10 mm0.4 mmISO Class 8
    DIN 69231000000000000000
    M5 × 0.8 mm8 mm5 mm11.8 mm1 mmISO Class 8
    DIN 69231000000000000000
    M6 × 1 mm10 mm6 mm14.2 mm1.1 mmISO Class 8
    DIN 6923, ISO 41611000000000000000
    M8 × 1 mm13 mm8 mm17.9 mm1.2 mmISO Class 8
    DIN 692310000000000000000
    M8 × 1.25 mm13 mm8 mm17.9 mm1.2 mmISO Class 8
    DIN 6923, ISO 416110000000000000000
    M10 × 1.25 mm15 mm10 mm21.8 mm1.5 mmISO Class 8
    DIN 69235000000000000000
    M10 × 1.5 mm15 mm10 mm21.8 mm1.5 mmISO Class 8
    DIN 69235000000000000000
    M12 × 1.75 mm18 mm12 mm26 mm1.8 mmISO Class 8
    DIN 69232500000000000000
    M14 × 2 mm21 mm14 mm29.9 mm2.1 mmISO Class 8
    DIN 69232500000000000000
    M16 × 2 mm24 mm16 mm34.5 mm2.4 mmISO Class 8
    DIN 6923, ISO 41611000000000000000
    M20 × 2.5 mm30 mm20 mm42.8 mm3 mmISO Class 8
    DIN 6923, ISO 416110000000000000
     
    Zinc-Yellow-Chromate-Plated Steel
    M4 × 0.7 mm7 mm4.2 mm10.5 mm0.9 mmISO Class 8
    DIN 6923, ISO 41615000000000000000
    M5 × 0.8 mm8 mm5 mm11.8 mm1 mmISO Class 8
    DIN 6923, ISO 41615000000000000000
    M6 × 1 mm10 mm6 mm14.2 mm1.1 mmISO Class 8
    DIN 6923, ISO 416110000000000000000
    M8 × 1.25 mm13 mm8 mm17.9 mm1.2 mmISO Class 8
    DIN 6923, ISO 41615000000000000000
    M10 × 1.25 mm15 mm10 mm21.8 mm1.5 mmISO Class 8
    DIN 69235000000000000000
    M10 × 1.5 mm15 mm10 mm21.8 mm1.5 mmISO Class 8
    DIN 6923, ISO 41612500000000000000
    M12 × 1.75 mm18 mm12 mm26 mm1.8 mmISO Class 8
    DIN 6923, ISO 41611000000000000000
    M14 × 2 mm21 mm14 mm29.9 mm2.1 mmISO Class 8
    DIN 69232500000000000000
    M16 × 2 mm24 mm16 mm34.5 mm2.4 mmISO Class 8
    DIN 6923, ISO 416110000000000000
     
    Black-Oxide Steel
    1/4"-20
    7/16"15/64"37/64"0.04"SAE Grade 5
    1000000000000000
    5/16"-18
    1/2"9/32"43/64"0.04"SAE Grade 5
    10000000000000000
    3/8"-16
    9/16"11/32"47/64"0.04"SAE Grade 5
    10000000000000000
    7/16"-14
    11/16"3/8"59/64"0.04"SAE Grade 5
    10000000000000000
    7/16"-20
    11/16"3/8"59/64"0.04"SAE Grade 5
    10000000000000000
    1/2"-13
    3/4"7/16"1"0.05"SAE Grade 5
    5000000000000000
    1/2"-20
    3/4"7/16"1"0.05"SAE Grade 5
    5000000000000000
    5/8"-11
    59/64"35/64"1 1/4"0.05"SAE Grade 5
    2500000000000000
    5/8"-18
    59/64"35/64"1 1/4"0.05"SAE Grade 5
    2500000000000000
    3/4"-10
    1 3/32"41/64"1 15/32"0.06"SAE Grade 5
    1000000000000000
    3/4"-16
    1 3/32"41/64"1 15/32"0.06"SAE Grade 5
    1000000000000000
    M4 × 0.7 mm7 mm4.6 mm10 mm0.4 mmISO Class 8
    DIN 69231000000000000000
    M5 × 0.8 mm8 mm5 mm11.8 mm1 mmISO Class 8
    DIN 69231000000000000000
    M6 × 1 mm10 mm6 mm14.2 mm1.1 mmISO Class 8
    DIN 69231000000000000000
    M8 × 1 mm13 mm8 mm17.9 mm1.2 mmISO Class 8
    DIN 692310000000000000000
    M8 × 1.25 mm13 mm8 mm17.9 mm1.2 mmISO Class 8
    DIN 692310000000000000000
    M10 × 1.25 mm15 mm10 mm21.8 mm1.5 mmISO Class 8
    DIN 69235000000000000000
    M10 × 1.5 mm15 mm10 mm21.8 mm1.5 mmISO Class 8
    DIN 69235000000000000000
    M12 × 1.75 mm18 mm12 mm26 mm1.8 mmISO Class 8
    DIN 69232500000000000000
     
    Steel
    M4 × 0.7 mm7 mm4.6 mm10 mm0.4 mmISO Class 8
    DIN 69231000000000000000
    M5 × 0.8 mm8 mm4.3 mm11.2 mm1.75 mmISO Class 8
    2500000000000000
    M6 × 1 mm10 mm5.5 mm14.25 mm2.2 mmISO Class 8
    2500000000000000
    M8 × 1 mm13 mm8 mm17.9 mm1.2 mmISO Class 8
    DIN 692310000000000000000
    M8 × 1.25 mm13 mm7 mm18.25 mm2.6 mmISO Class 8
    2500000000000000
    M10 × 1.25 mm15 mm10 mm21.8 mm1.5 mmISO Class 8
    DIN 6923500000000000000
    M10 × 1.5 mm15 mm7.9 mm21 mm2.8 mmISO Class 8
    100000000000000
    M12 × 1.75 mm18 mm12 mm26 mm1.8 mmISO Class 8
    DIN 6923, ISO 41612500000000000000
    M14 × 2 mm21 mm14 mm29.9 mm2.1 mmISO Class 8
    DIN 69232500000000000000
    M16 × 2 mm24 mm16 mm34.5 mm2.4 mmISO Class 8
    DIN 6923100000000000000
     
    High-Strength Steel
    Image of Product. Bottom orientation. Flange Nuts. Serrated Flange Nuts.
    Rated Grade 8, Grade G, or Class 10, these are about 25% stronger than medium-strength steel nuts. They are commonly used to fasten components in valves, pumps, and motors. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.
    Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.
    Zinc-Yellow-Chromate-Plated Steel—With a more durable finish than clear zinc plating, these nuts are suitable for most wet and outdoor environments. However, they won't hold up to the harsh chemicals that stainless steel can.
    Black-Oxide Steel—Typically chosen for their appearance, these nuts have a dark, matte coating that creates a finished look. They offer minimal corrosion resistance, so they're best for dry environments.
    Phosphate-Coated Steel—Paint adheres evenly to the surface of these nuts, so you can add your own decorative finish. They are more durable than zinc-plated steel nuts to withstand wet and outdoor environments. However, they won't hold up to the harsh chemicals that stainless steel can.
    Black Phosphate-Coated Steel—The dark coating creates both a finished appearance and a barrier against rust that's more durable than clear zinc plating.
    Steel—Best for dry environments since moisture will cause these nuts to rust.
    Flange
    Thread Size
    Wd.
    Ht.
    Dia.
    Thk.
    Fastener Strength
    Grade/Class
    Specs.
    Met
    Pkg.
    Qty.
    Pkg.
    Zinc-Plated Steel
    1/4"-20
    7/16"15/64"19/32"0.04"SAE Grade 8
    100000000000000000
    5/16"-18
    1/2"9/32"11/16"0.04"SAE Grade 8
    10000000000000000
    3/8"-16
    9/16"11/32"3/4"0.04"SAE Grade 8
    500000000000000
    1/2"-13
    3/4"29/64"1 1/32"0.05"SAE Grade 8
    2500000000000000
    5/8"-11
    15/16"9/16"1 9/32"0.05"SAE Grade 8
    2500000000000000
    3/4"-10
    1 1/8"21/32"1 1/2"0.06"SAE Grade 8
    1000000000000000
    M5 × 0.8 mm8 mm5 mm11.8 mm1 mmISO Class 10
    DIN 6923250000000000000
    M6 × 1 mm10 mm6 mm14.2 mm1.1 mmISO Class 10
    DIN 69235000000000000000
    M8 × 1.25 mm13 mm8 mm17.9 mm1.2 mmISO Class 10
    DIN 69235000000000000000
    M10 × 1.5 mm15 mm10 mm21.8 mm1.5 mmISO Class 10
    DIN 69232500000000000000
    M12 × 1.75 mm18 mm12 mm26 mm1.8 mmISO Class 10
    DIN 6923100000000000000
    M16 × 2 mm24 mm16 mm34.5 mm2.4 mmISO Class 10
    DIN 6923500000000000000
    M20 × 2.5 mm30 mm20 mm42.8 mm3 mmISO Class 10
    DIN 692310000000000000
     
    Zinc-Yellow-Chromate-Plated Steel
    9/16"-12
    7/8"1/2"1 3/16"0.05"SAE Grade 8
    50000000000000
     
    Black-Oxide Steel
    1/2"-13
    3/4"29/64"1 1/32"0.05"SAE Grade 8
    1000000000000000
    5/8"-11
    15/16"9/16"1 9/32"0.05"SAE Grade 8
    500000000000000
    3/4"-10
    1 1/8"43/64"1 1/2"0.06"SAE Grade 8
    10000000000000
     
    Phosphate-Coated Steel
    3/4"-10
    1 1/8"43/64"1 1/2"0.06"SAE Grade 8
    1000000000000000
     
    Black Phosphate-Coated Steel
    1/4"-20
    7/16"15/64"19/32"0.04"SAE Grade 8
    500000000000000
    5/16"-18
    1/2"9/32"11/16"0.04"SAE Grade 8
    250000000000000
    3/8"-16
    9/16"11/32"3/4"0.04"SAE Grade 8
    250000000000000
     
    Steel
    1/4"-20
    7/16"15/64"19/32"0.04"SAE Grade 8
    10000000000000000
    5/16"-18
    1/2"9/32"43/64"0.04"SAE Grade 8
    10000000000000000
    3/8"-16
    9/16"11/32"3/4"0.04"SAE Grade 8
    10000000000000000
    1/2"-13
    3/4"29/64"1 1/32"0.05"SAE Grade 8
    2500000000000000
    5/8"-11
    15/16"9/16"1 9/32"0.05"SAE Grade 8
    100000000000000
    M5 × 0.8 mm8 mm5 mm11.8 mm1 mmISO Class 10
    DIN 6923250000000000000
    M6 × 1 mm10 mm6 mm14.2 mm1.1 mmISO Class 10
    DIN 69235000000000000000
    M8 × 1.25 mm13 mm8 mm17.9 mm1.2 mmISO Class 10
    DIN 69235000000000000000
    M10 × 1.5 mm15 mm10 mm21.8 mm1.5 mmISO Class 10
    DIN 69232500000000000000
    M12 × 1.75 mm18 mm12 mm26 mm1.8 mmISO Class 10
    DIN 69231000000000000000
    M16 × 2 mm24 mm16 mm34.5 mm2.4 mmISO Class 10
    DIN 6923500000000000000
    M20 × 2.5 mm30 mm20 mm42.8 mm3 mmISO Class 10
    DIN 692310000000000000
     
    Low-Strength Steel
    Image of Product. Bottom orientation. Flange Nuts. Serrated Flange Nuts.
    About half the strength of medium-strength steel nuts, these 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.
    Black-Oxide Steel—Typically chosen for their appearance, these nuts have a dark, matte coating that creates a finished look. They offer minimal corrosion resistance, so they're best for dry environments.
    Zinc-Flake-Coated Steel—The most durable zinc coating, zinc flake is a multilayer finish that resists wear for long-term rust protection. Similar to zinc yellow-chromate, it won't hold up to harsh chemicals like stainless steel can.
    Flange
    Thread
    Size
    Wd.
    Ht.
    Dia.
    Thk.
    Pkg.
    Qty.
    Pkg.
    Zinc-Plated Steel
    4-40
    1/4"5/32"25/64"0.02"2500000000000000
    6-32
    5/16"11/64"27/64"0.02"1000000000000000
    8-32
    11/32"13/64"15/32"0.02"1000000000000000
    10-24
    3/8"7/32"1/2"0.03"1000000000000000
    10-32
    3/8"7/32"1/2"0.03"1000000000000000
    12-24
    7/16"15/64"19/32"0.04"500000000000000
    1/4"-20
    7/16"15/64"19/32"0.04"1000000000000000
    1/4"-20
    7/16"19/64"47/64"0.04"10000000000000000
    1/4"-28
    7/16"15/64"19/32"0.04"1000000000000000
    5/16"-18
    1/2"9/32"43/64"0.04"1000000000000000
    5/16"-18
    1/2"23/64"13/16"0.04"10000000000000000
    5/16"-24
    1/2"9/32"43/64"0.04"1000000000000000
    3/8"-16
    9/16"11/32"3/4"0.04"10000000000000000
    3/8"-16
    9/16"25/64"59/64"0.04"5000000000000000
    3/8"-24
    9/16"11/32"3/4"0.04"10000000000000000
    7/16"-14
    11/16"25/64"15/16"0.04"5000000000000000
    7/16"-20
    11/16"25/64"15/16"0.04"5000000000000000
    1/2"-13
    3/4"29/64"1 1/32"0.05"5000000000000000
    1/2"-13
    3/4"1/2"1 13/64"0.06"100000000000000
    1/2"-20
    3/4"29/64"1 1/32"0.05"250000000000000
    9/16"-12
    7/8"1/2"1 3/16"0.05"1000000000000000
    9/16"-18
    7/8"1/2"1 3/16"0.05"50000000000000
    5/8"-11
    15/16"9/16"1 9/32"0.05"2500000000000000
    5/8"-18
    15/16"9/16"1 9/32"0.05"100000000000000
    3/4"-10
    1 1/8"43/64"1 1/2"0.06"1000000000000000
    3/4"-16
    1 1/8"43/64"1 1/2"0.06"1000000000000000
    7/8"-9
    1 3/16"25/32"1 11/16"0.11"100000000000000
     
    Black-Oxide Steel
    6-32
    5/16"5/32"27/64"0.02"1000000000000000
    8-32
    11/32"3/16"15/32"0.02"1000000000000000
    10-24
    3/8"7/32"1/2"0.03"1000000000000000
    10-32
    3/8"7/32"1/2"0.03"1000000000000000
    12-24
    7/16"15/64"19/32"0.04"250000000000000
    1/4"-20
    7/16"15/64"19/32"0.04"10000000000000000
    1/4"-28
    7/16"15/64"19/32"0.04"100000000000000
    5/16"-18
    1/2"9/32"11/16"0.04"500000000000000
    5/16"-24
    1/2"9/32"43/64"0.04"500000000000000
    3/8"-16
    9/16"11/32"3/4"0.04"5000000000000000
    3/8"-24
    9/16"11/32"3/4"0.04"250000000000000
    7/16"-14
    11/16"25/64"15/16"0.04"50000000000000
    7/16"-20
    11/16"25/64"15/16"0.04"1000000000000000
    1/2"-13
    3/4"29/64"1 1/32"0.05"2500000000000000
    1/2"-20
    3/4"29/64"1 1/32"0.05"50000000000000
    9/16"-12
    7/8"1/2"1 3/16"0.05"10000000000000
    5/8"-11
    15/16"9/16"1 9/32"0.05"50000000000000
    5/8"-18
    15/16"9/16"1 9/32"0.05"10000000000000
     
    Zinc-Flake-Coated Steel
    6-32
    5/16"5/32"27/64"0.02"2500000000000000
    8-32
    11/32"13/64"15/32"0.02"2500000000000000
    10-24
    3/8"7/32"1/2"0.03"2500000000000000
    10-32
    3/8"7/32"1/2"0.03"2500000000000000
    1/4"-20
    7/16"15/64"19/32"0.04"100000000000000
    5/16"-18
    1/2"9/32"43/64"0.04"1000000000000000
    3/8"-16
    9/16"11/32"3/4"0.04"1000000000000000
    3/8"-24
    9/16"11/32"3/4"0.04"1000000000000000
    7/16"-14
    11/16"25/64"3/4"0.04"500000000000000
    1/2"-13
    3/4"29/64"1 1/32"0.05"10000000000000
     
    Corrosion-Resistant Stainless Steel
    Image of Product. Bottom orientation. Flange Nuts. Serrated Flange 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 flange nuts, these hold up in just about any environment, including harsh weather, salt water, and most chemicals.
    Flange
    Thread Size
    Wd.
    Ht.
    Dia.
    Thk.
    Specs.
    Met
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel
    6-32
    5/16"11/64"27/64"0.07"5000000000000000
    8-32
    11/32"13/64"15/32"0.07"500000000000000
    10-24
    3/8"7/32"1/2"0.09"500000000000000
    10-32
    3/8"7/32"1/2"0.09"500000000000000
    12-24
    7/16"15/64"19/32"0.04"1000000000000000
    1/4"-20
    7/16"15/64"19/32"0.1"500000000000000
    1/4"-28
    7/16"15/64"19/32"0.1"250000000000000
    5/16"-18
    1/2"9/32"43/64"0.11"250000000000000
    5/16"-24
    1/2"9/32"43/64"0.11"100000000000000
    3/8"-16
    9/16"11/32"3/4"0.12"250000000000000
    3/8"-24
    9/16"11/32"3/4"0.12"100000000000000
    1/2"-13
    3/4"29/64"1 1/32"0.15"100000000000000
    1/2"-20
    3/4"29/64"1 1/32"0.05"1000000000000000
    M3 × 0.5 mm5.5 mm4 mm8 mm0.7 mmDIN 69231000000000000000
    M4 × 0.7 mm7 mm4.65 mm10 mm1 mmDIN 692310000000000000000
    M5 × 0.8 mm8 mm5 mm11 mm1 mmDIN 692310000000000000000
    M6 × 1 mm10 mm6 mm14.2 mm1.18 mmDIN 6923500000000000000
    M8 × 1.25 mm13 mm8 mm17.9 mm1.3 mmDIN 6923250000000000000
    M10 × 1.5 mm15 mm10 mm21.8 mm1.8 mmDIN 6923250000000000000
    M12 × 1.75 mm18 mm12 mm26 mm2.19 mmDIN 6923100000000000000
     
    Super-Corrosion-Resistant 316 Stainless Steel
    6-32
    5/16"5/32"27/64"0.02"250000000000000
    8-32
    11/32"3/16"15/32"0.02"250000000000000
    10-24
    3/8"7/32"1/2"0.03"250000000000000
    10-32
    3/8"7/32"1/2"0.03"250000000000000
    1/4"-20
    7/16"15/64"19/32"0.04"100000000000000
    1/4"-28
    7/16"15/64"19/32"0.09"5000000000000000
    5/16"-18
    1/2"9/32"11/16"0.04"100000000000000
    5/16"-24
    1/2"9/32"11/16"0.13"5000000000000000
    3/8"-16
    9/16"11/32"3/4"0.04"100000000000000
    3/8"-24
    9/16"11/32"3/4"0.13"2500000000000000
    1/2"-13
    3/4"29/64"1"0.05"50000000000000
    M3 × 0.5 mm5.5 mm4 mm8 mm0.7 mmDIN 6923250000000000000
    M4 × 0.7 mm7 mm4.65 mm10 mm1 mmDIN 6923250000000000000
    M5 × 0.8 mm8 mm5 mm11.8 mm1 mmDIN 69232500000000000000
    M6 × 1 mm10 mm6 mm14.2 mm1.18 mmDIN 6923250000000000000
    M8 × 1.25 mm13 mm8 mm17.9 mm1.3 mmDIN 6923100000000000000
    M10 × 1.5 mm15 mm10 mm21.8 mm1.8 mmDIN 6923100000000000000
    M12 × 1.75 mm18 mm12 mm26 mm2.19 mmDIN 692350000000000000
     
    Brass
    Image of Product. Bottom orientation. Flange Nuts. Serrated Flange 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.
    Flange
    Thread
    Size
    Wd.
    Ht.
    Dia.
    Thk.
    Pkg.
    Qty.
    Pkg.
    Brass
    1/4"-20
    7/16"15/64"19/32"0.04"500000000000000
    5/16"-18
    1/2"9/32"43/64"0.04"500000000000000
    3/8"-16
    9/16"11/32"3/4"0.04"500000000000000
     
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