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)
    127 Products

    Washer Type

    Performance

    Washer Designation

    General Purpose Washers

    Your go-to metal washer for every screw size. Washers take the pressure off nuts and screws to protect mounting surfaces.
    Steel
    Image of Product. Front orientation. Washers. General Purpose Washers.
    Black Super-Corrosion-Resistant-Coated Steel—Combines a finished appearance with the rust resistance of 316 stainless steel. The coating has been tested to extreme standards, including 1,000 hours of salt spray resistance, to hold up in wet and outdoor environments. Also known as black luster.
    For Fastener Strength Grade/Class—If you require screws or nuts with a specific fastener strength rating, make sure your washer matches the grade or class.
    For Screw
    Size
    ID
    OD
    Thk.
    For Fastener Strength
    Grade/Class
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Black Super-Corrosion-Resistant-Coated Steel
    1/4"
    		0.312"0.750"0.055" to 0.072"SAE Grade 8
    		—10000000000000000
    5/16"
    		0.375"0.875"0.064" to 0.080"SAE Grade 8
    		ASME B18.21.11000000000000000
    3/8"
    		0.438"1.000"0.064" to 0.080"SAE Grade 8
    		ASME B18.21.150000000000000
    7/16"
    		0.500"1.250"0.064" to 0.080"SAE Grade 8
    		ASME B18.21.1500000000000000
    1/2"
    		0.562"1.375"0.097" to 0.121"SAE Grade 8
    		ASME B18.21.1500000000000000
    9/16"
    		0.625"1.500"0.097" to 0.121"SAE Grade 8
    		—500000000000000
    5/8"
    		0.688"1.750"0.122" to 0.146"SAE Grade 8
    		ASME B18.21.110000000000000
    3/4"
    		0.812"2.000"0.122" to 0.146"SAE Grade 8
    		ASME B18.21.110000000000000
    7/8"
    		0.938"2.250"0.136" to 0.160"SAE Grade 8
    		ASME B18.21.110000000000000
    1"
    		1.062"2.500"0.136" to 0.160"SAE Grade 8
    		ASME B18.21.110000000000000
    1 1/8"
    		1.250"2.750"0.136" to 0.160"SAE Grade 8
    		ASME B18.21.1100000000000000
    1 1/4"
    		1.375"3.000"0.136" to 0.160"SAE Grade 8
    		ASME B18.21.1100000000000000
    1 3/8"
    		1.500"3.250"0.136" to 0.160"SAE Grade 8
    		—100000000000000
    1 1/2"
    		1.625"3.500"0.136" to 0.160"SAE Grade 8
    		—100000000000000
    M4
    		4.3 mm9.0 mm0.7 mm to 0.9 mm—DIN 125, ISO 7089100000000000000
    M5
    		5.3 mm10.0 mm0.9 mm to 1.1 mm—DIN 125, ISO 7089100000000000000
    M6
    		6.4 mm12.0 mm1.4 mm to 1.8 mm—DIN 125, ISO 70891000000000000000
    M7
    		7.4 mm14.0 mm1.4 mm to 1.8 mm—DIN 125, ISO 708950000000000000
    M8
    		8.4 mm16.0 mm1.4 mm to 1.8 mm—DIN 125, ISO 708950000000000000
    M10
    		10.5 mm20.0 mm1.8 mm to 2.2 mm—DIN 125, ISO 708950000000000000
    M12
    		13.0 mm24.0 mm2.3 mm to 2.7 mm—DIN 125, ISO 708950000000000000
    M14
    		15.0 mm28.0 mm2.3 mm to 2.7 mm—DIN 125, ISO 708950000000000000
    M16
    		17.0 mm30.0 mm2.7 mm to 3.3 mm—DIN 125, ISO 708950000000000000
    M18
    		19.0 mm34.0 mm2.7 mm to 3.3 mm—DIN 125, ISO 708950000000000000
    M20
    		21.0 mm37.0 mm2.7 mm to 3.3 mm—DIN 125, ISO 708950000000000000
    M24
    		25.0 mm44.0 mm3.3 mm to 4.3 mm—DIN 125, ISO 708910000000000000
     

    Oversized Washers

    These washers have exaggerated diameters to cover large holes and to compensate for uneven mounting surfaces. They are also thicker than general purpose washers, so they bridge wide gaps when used as spacers.
    Steel
    Image of Product. Front orientation. Washers. Oversized Washers.
    Black Super-Corrosion-Resistant-Coated Steel—Combines a finished appearance with the rust resistance of 316 stainless steel. The coating has been tested to extreme standards, including 1,000 hours of salt spray resistance, to hold up in wet and outdoor environments. Also known as black luster.
    For Fastener Strength Grade/Class—If you require screws or nuts with a specific fastener strength rating, make sure your washer matches the grade or class.
    For Screw
    Size
    ID
    OD
    Thk.
    For Fastener Strength
    Grade/Class
    Specs.
    Met
    Pkg.
    Qty.
    Pkg.
    Black Super-Corrosion-Resistant-Coated Steel
    3/16"
    		0.219"1.000"0.051" to 0.084"——10000000000000000
    3/16"
    		0.219"1.250"0.051" to 0.084"——1000000000000000
    1/4"
    		0.281"1.000"0.051" to 0.084"——1000000000000000
    1/4"
    		0.281"1.250"0.051" to 0.084"——1000000000000000
    1/4"
    		0.281"1.500"0.051" to 0.084"——50000000000000
    1/4"
    		0.313"0.750"0.090" to 0.110"SAE Grade 8
    		—50000000000000
    5/16"
    		0.344"1.250"0.051" to 0.084"——1000000000000000
    5/16"
    		0.344"1.500"0.051" to 0.084"——50000000000000
    5/16"
    		0.375"0.875"0.090" to 0.110"SAE Grade 8
    		—50000000000000
    3/8"
    		0.406"1.250"0.051" to 0.084"——1000000000000000
    3/8"
    		0.406"1.500"0.051" to 0.084"——50000000000000
    3/8"
    		0.438"1.000"0.110" to 0.126"SAE Grade 8
    		—500000000000000
    7/16"
    		0.500"1.250"0.110" to 0.126"SAE Grade 8
    		—500000000000000
    1/2"
    		0.531"2.000"0.051" to 0.084"——500000000000000
    1/2"
    		0.563"1.375"0.156" to 0.188"SAE Grade 8
    		—10000000000000
    9/16"
    		0.625"1.500"0.156" to 0.188"SAE Grade 8
    		—10000000000000
    5/8"
    		0.688"1.750"0.170" to 0.195"SAE Grade 8
    		—10000000000000
    3/4"
    		0.813"2.000"0.170" to 0.195"SAE Grade 8
    		—10000000000000
    7/8"
    		0.938"2.250"0.235" to 0.265"SAE Grade 8
    		—100000000000000
    1"
    		1.063"2.500"0.235" to 0.265"SAE Grade 8
    		—100000000000000
    M4
    		4.3 mm12.0 mm0.9 mm to 1.1 mm—DIN 902150000000000000
    M5
    		5.3 mm15.0 mm1.0 mm to 1.4 mm—DIN 902150000000000000
    M6
    		6.4 mm18.0 mm1.4 mm to 1.8 mm—DIN 902150000000000000
    M8
    		8.4 mm24.0 mm1.8 mm to 2.2 mm—DIN 902150000000000000
    M10
    		10.5 mm30.0 mm2.3 mm to 2.7 mm—DIN 9021500000000000000
    M12
    		13.0 mm37.0 mm2.7 mm to 3.3 mm—DIN 902110000000000000
    M14
    		15.0 mm44.0 mm2.7 mm to 3.3 mm—DIN 902110000000000000
     

    SAE Washers

    Originally designed for the automotive industry, these washers conform to SAE sizing standards. They generally have smaller diameters than USS washers to fit in cramped spots and are thinner to create more precise gaps. Washers distribute pressure under screws and nuts to protect your mounting surface.
    Steel
    Image of Product. Front orientation. Washers. SAE Washers.
    Black Super-Corrosion-Resistant-Coated Steel—Combines a finished appearance with the rust resistance of 316 stainless steel. The coating has been tested to extreme standards, including 1,000 hours of salt spray resistance, to hold up in wet and outdoor environments. Also known as black luster.
    For Fastener Strength Grade/Class—If you require screws or nuts with a specific fastener strength rating, make sure your washer matches the grade or class.
    For Screw
    Size
    ID
    OD
    Thk.
    For Fastener Strength
    Grade/Class
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Black Super-Corrosion-Resistant-Coated Steel
    No. 4
    		0.125"0.312"0.020" to 0.040"——10000000000000000
    No. 5
    		0.141"0.281"0.020" to 0.040"——1000000000000000
    No. 6
    		0.156"0.375"0.036" to 0.065"—ASME B18.21.11000000000000000
    No. 8
    		0.188"0.438"0.036" to 0.065"—ASME B18.21.11000000000000000
    No. 10
    		0.219"0.500"0.036" to 0.065"—ASME B18.21.11000000000000000
    No. 12
    		0.250"0.562"0.051" to 0.080"—ASME B18.21.11000000000000000
    1/4"
    		0.281"0.625"0.051" to 0.080"—ASME B18.21.11000000000000000
    1/4"
    		0.281"0.625"0.055" to 0.065"SAE Grade 8
    		ASME B18.21.150000000000000
    5/16"
    		0.344"0.688"0.051" to 0.080"—ASME B18.21.11000000000000000
    5/16"
    		0.344"0.688"0.055" to 0.065"SAE Grade 8
    		ASME B18.21.150000000000000
    3/8"
    		0.406"0.812"0.051" to 0.080"—ASME B18.21.11000000000000000
    3/8"
    		0.406"0.813"0.055" to 0.065"SAE Grade 8
    		ASME B18.21.150000000000000
    7/16"
    		0.469"0.922"0.051" to 0.080"—ASME B18.21.11000000000000000
    7/16"
    		0.469"0.922"0.055" to 0.065"SAE Grade 8
    		ASME B18.21.150000000000000
    1/2"
    		0.531"1.062"0.074" to 0.121"—ASME B18.21.11000000000000000
    1/2"
    		0.531"1.063"0.100" to 0.116"SAE Grade 8
    		ASME B18.21.1500000000000000
    9/16"
    		0.594"1.156"0.074" to 0.121"—ASME B18.21.11000000000000000
    9/16"
    		0.594"1.188"0.100" to 0.116"SAE Grade 8
    		ASME B18.21.1500000000000000
    5/8"
    		0.656"1.312"0.074" to 0.121"—ASME B18.21.11000000000000000
    5/8"
    		0.656"1.313"0.122" to 0.138"SAE Grade 8
    		ASME B18.21.1500000000000000
    3/4"
    		0.812"1.469"0.108" to 0.160"—ASME B18.21.150000000000000
    3/4"
    		0.813"1.469"0.122" to 0.138"SAE Grade 8
    		ASME B18.21.110000000000000
    7/8"
    		0.938"1.750"0.108" to 0.160"—ASME B18.21.1500000000000000
    7/8"
    		0.938"1.750"0.136" to 0.152"SAE Grade 8
    		ASME B18.21.110000000000000
    1"
    		1.062"2.000"0.108" to 0.160"—ASME B18.21.1500000000000000
    1"
    		1.063"2.000"0.136" to 0.160"SAE Grade 8
    		ASME B18.21.110000000000000
    1 1/8"
    		1.250"2.250"0.108" to 0.160"—ASME B18.21.1500000000000000
    1 1/4"
    		1.375"2.500"0.136" to 0.160"SAE Grade 8
    		ASME B18.21.110000000000000
    1 1/4"
    		1.375"2.500"0.136" to 0.192"—ASME B18.21.110000000000000
    1 3/8"
    		1.500"2.750"0.136" to 0.192"—ASME B18.21.110000000000000
    1 1/2"
    		1.625"3.000"0.136" to 0.160"SAE Grade 8
    		ASME B18.21.1100000000000000
    1 1/2"
    		1.625"3.000"0.136" to 0.192"—ASME B18.21.110000000000000
    1 3/4"
    		1.875"3.375"0.178" to 0.196"SAE Grade 8
    		ASME B18.21.1100000000000000
    2"
    		2.125"3.750"0.178" to 0.196"SAE Grade 8
    		ASME B18.21.1100000000000000
     

    USS Washers

    These washers meet USS sizing specifications and typically have larger diameters than SAE washers. As a result, they accommodate larger screws and nuts and distribute pressure across a wider surface area. They are also thicker, so they withstand heavier loads and span wider gaps when used as spacers.
    Steel
    Image of Product. Front orientation. Washers. USS Washers.
    Black Super-Corrosion-Resistant-Coated Steel—Combines a finished appearance with the rust resistance of 316 stainless steel. The coating has been tested to extreme standards, including 1,000 hours of salt spray resistance, to hold up in wet and outdoor environments. Also known as black luster.
    For Fastener Strength Grade/Class—If you require screws or nuts with a specific fastener strength rating, make sure your washer matches the grade or class.
    For Screw
    Size
    ID
    OD
    Thk.
    For Fastener Strength
    Grade/Class
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Black Super-Corrosion-Resistant-Coated Steel
    1/4"
    		0.312"0.750"0.051" to 0.080"—ASME B18.21.110000000000000000
    1/4"
    		0.312"0.750"0.051" to 0.080"SAE Grade 8
    		—1000000000000000
    5/16"
    		0.375"0.875"0.064" to 0.104"—ASME B18.21.11000000000000000
    5/16"
    		0.375"0.875"0.064" to 0.104"SAE Grade 8
    		ASME B18.21.11000000000000000
    3/8"
    		0.438"1.000"0.064" to 0.104"—ASME B18.21.11000000000000000
    3/8"
    		0.438"1.000"0.064" to 0.104"SAE Grade 8
    		ASME B18.21.150000000000000
    7/16"
    		0.500"1.250"0.064" to 0.104"—ASME B18.21.11000000000000000
    7/16"
    		0.500"1.250"0.064" to 0.104"SAE Grade 8
    		ASME B18.21.1500000000000000
    1/2"
    		0.562"1.375"0.086" to 0.132"—ASME B18.21.150000000000000
    1/2"
    		0.562"1.375"0.086" to 0.132"SAE Grade 8
    		ASME B18.21.1500000000000000
    9/16"
    		0.625"1.469"0.086" to 0.132"—ASME B18.21.1500000000000000
    9/16"
    		0.625"1.500"0.086" to 0.132"SAE Grade 8
    		—500000000000000
    5/8"
    		0.688"1.750"0.108" to 0.160"—ASME B18.21.150000000000000
    5/8"
    		0.688"1.750"0.108" to 0.160"SAE Grade 8
    		ASME B18.21.110000000000000
    3/4"
    		0.812"2.000"0.122" to 0.177"—ASME B18.21.1500000000000000
    3/4"
    		0.812"2.000"0.122" to 0.177"SAE Grade 8
    		ASME B18.21.110000000000000
    7/8"
    		0.938"2.250"0.136" to 0.192"—ASME B18.21.1500000000000000
    7/8"
    		0.938"2.250"0.136" to 0.192"SAE Grade 8
    		ASME B18.21.110000000000000
    1"
    		1.062"2.500"0.136" to 0.192"—ASME B18.21.1500000000000000
    1"
    		1.062"2.500"0.136" to 0.192"SAE Grade 8
    		ASME B18.21.110000000000000
    1 1/8"
    		1.250"2.750"0.136" to 0.192"—ASME B18.21.110000000000000
    1 1/8"
    		1.250"2.750"0.136" to 0.192"SAE Grade 8
    		ASME B18.21.1100000000000000
    1 1/4"
    		1.375"3.000"0.136" to 0.192"—ASME B18.21.110000000000000
    1 1/4"
    		1.375"3.000"0.136" to 0.192"SAE Grade 8
    		ASME B18.21.1100000000000000
    1 3/8"
    		1.500"3.250"0.153" to 0.213"—ASME B18.21.110000000000000
    1 3/8"
    		1.500"3.250"0.153" to 0.213"SAE Grade 8
    		—100000000000000
    1 1/2"
    		1.625"3.500"0.153" to 0.213"—ASME B18.21.110000000000000
    1 1/2"
    		1.625"3.500"0.153" to 0.213"SAE Grade 8
    		—100000000000000
    1 5/8"
    		1.750"3.750"0.153" to 0.213"—ASME B18.21.110000000000000
    1 3/4"
    		1.875"4.000"0.153" to 0.213"—ASME B18.21.110000000000000
    1 7/8"
    		2.000"4.250"0.153" to 0.213"—ASME B18.21.110000000000000
    2"
    		2.125"4.500"0.153" to 0.213"—ASME B18.21.1100000000000000
    2 1/4"
    		2.375"4.750"0.193" to 0.248"—ASME B18.21.1100000000000000
    2 1/2"
    		2.625"5.000"0.210" to 0.280"—ASME B18.21.1100000000000000
    2 3/4"
    		2.875"5.250"0.228" to 0.310"—ASME B18.21.1100000000000000
    3"
    		3.125"5.500"0.249" to 0.327"—ASME B18.21.1100000000000000
     

    Undersized Washers

    Image of Product. Front orientation. Washers. Undersized Washers.
    These washers distribute pressure evenly under fasteners with narrow heads, such as cheese and socket head screws. They have smaller diameters than general purpose washers of the same screw size.
    Steel
    Black Super-Corrosion-Resistant-Coated Steel—Combines a finished appearance with the rust resistance of 316 stainless steel. The coating has been tested to extreme standards, including 1,000 hours of salt spray resistance, to hold up in wet and outdoor environments. Also known as black luster.
    For Screw
    Size
    ID,
    mm
    OD,
    mm
    Thk., mm
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Black Super-Corrosion-Resistant-Coated Steel
    M6
    		6.411.01.4 to 1.8DIN 433, ISO 709210000000000000000
    M8
    		8.415.01.4 to 1.8DIN 433, ISO 70921000000000000000
    M10
    		10.518.01.4 to 1.8DIN 433, ISO 70921000000000000000
    M12
    		13.020.01.8 to 2.2DIN 433, ISO 70921000000000000000
     
    back to top