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Washer Type Washer Type |
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Flat | Split Lock |
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Spring Lock | Tab Lock |
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Tooth Lock | Wave |
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Wedge Lock |
Thickness Thickness |
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Specifications Met Specifications Met |
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Hardness Hardness |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Fastener Strength Grade/Class Fastener StrengthGrade/Class |
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Minimum Temperature Minimum Temperature |
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Serration Location Serration Location |
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Spring Lock Washer Shape Spring Lock Washer Shape |
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About Washers
More
Metric General Purpose Washers






Use these metric washers to evenly distribute the load under bolt or screw heads and nuts when fastening. They can also act as spacers.
Stainless steel washers are more corrosion resistant than steel washers, and almost as strong. 18-8 and 17-7 PH stainless steel washers will hold up in humid, damp, and washdown environments, but will corrode if exposed to salt water or chemicals. 17-7 PH stainless steel washers are stronger than 18-8 stainless steel. Black-oxide 18-8 stainless steel washers have a matte-black finish. More corrosion resistant than 18-8 and 17-7 PH stainless steel, 316 stainless steel washers will not corrode from salt water, chlorine solutions, and chemicals. Stronger and slightly more corrosion resistant than 316 stainless steel, Bumax 109 stainless steel washers are best for marine environments and chemical-processing plants.
Steel washers are stronger and more wear resistant than stainless steel washers. Steel washers without a plating or coating are best for dry environments, since moisture will cause them to rust. Zinc-plated steel washers have an outer layer of zinc that protects the inner steel from rust and extends the life of the washer. Although they are stronger and more wear resistant than stainless steel, they are not as corrosion resistant. Use them in wet environments, but avoid contact with salt water and chemicals. Zinc-flake-coated and black corrosion-resistant-coated steel washers have the same level of corrosion resistance—both resist corrosion from chemicals and withstand 1,000 hours of salt spray. The black corrosion-resistant-coated steel washers have a black semi-gloss finish.
At one-third the weight of steel, aluminum washers are the lightest option. They will not rust in wet environments.
In addition to resisting rust in wet environments, copper and brass washers are electrically conductive.
Washers that meet ISO 7089, 7090, 7091, and 7092 (formerly DIN 125, 126, and 433), meet international standards for fastener dimensions. The ISO 7091 washers have a slightly rougher surface than a typical flat washer.
For technical drawings and 3-D models, click on a part number.
For Screw Size | ID, mm | OD, mm | Thickness, mm | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | ||||||||
---|---|---|---|---|---|---|---|---|
M18 | 19.0 | 34.0 | 2.7-3.3 | Not Rated | DIN 125; ISO 7089 | 10 | 000000000 | 00000 |
316 Stainless Steel | ||||||||
M18 | 19.0 | 34.0 | 2.7-3.3 | Not Rated | DIN 125; ISO 7089 | 10 | 000000000 | 0000 |
Zinc-Plated Steel | ||||||||
M18 | 19.0 | 30.0 | 2.3-2.7 | Rockwell B76 | DIN 433; ISO 7092 | 25 | 000000000 | 00000 |
M18 | 19.0 | 34.0 | 2.7-3.3 | Rockwell B75 | DIN 125; ISO 7089 | 50 | 000000000 | 00000 |
Zinc-Plated Steel for Class 8.8 | ||||||||
M18 | 19.0 | 34.0 | 2.7-3.3 | Rockwell B91 | DIN 125; ISO 7089 | 25 | 000000000 | 00000 |
Zinc-Flake-Coated Class 8.8 Steel | ||||||||
M18 | 19.0 | 34.0 | 2.7-3.3 | Rockwell B91 | DIN 125; ISO 7089 | 5 | 000000000 | 00000 |
Aluminum | ||||||||
M18 | 19.0 | 34.0 | 2.7-3.3 | Not Rated | DIN 125; ISO 7089 | 5 | 000000000 | 00000 |
Copper | ||||||||
M18 | 19.0 | 34.0 | 2.7-3.3 | Rockwell B35 | DIN 125; ISO 7089 | 1 | 000000000 | 0000 |
Brass | ||||||||
M18 | 19.0 | 34.0 | 2.7-3.3 | Not Rated | DIN 125; ISO 7089 | 1 | 000000000 | 0000 |
Metric Oversized Washers




Compared to our general purpose washers, these have exaggerated diameters and/or thicknesses. Use them to cover oversized holes, hold heavy fastening loads, or as spacers and levelers.
Plain steel washers are stronger, more wear resistant, and less costly than zinc-plated steel and stainless steel washers. They should not be used in wet or corrosive environments because they easily rust. Zinc-plated steel washers have an outer layer of zinc that prevents the steel from rusting in wet areas. Compared to stainless steel, they're stronger, more wear resistant, and less costly, but not as corrosion resistant. Avoid exposing them to salt water and chemicals. Stainless steel washers are more corrosion resistant than steel washers, and almost as strong. Use them in damp and washdown applications without worrying about rust. 18-8 stainless steel and 17-7 PH stainless steel washers have similar qualities to one another, except 17-7 PH stainless steel washers are stronger. Black-oxide 18-8 stainless steel washers resist corrosion just as well as regular 18-8 stainless steel washers and have a matte-black finish. 316 stainless steel washers stand up to salt water, chlorine solutions, and other chemicals without rusting. Washers that meet DIN and ISO specifications, meet international standards for washer dimensions. ISO 8738 is formerly DIN 1440. ISO 7093 is formerly DIN 9021.
For technical drawings and 3-D models, click on a part number.
For Screw Size | ID, mm | OD, mm | Thick., mm | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
Steel | ||||||||
---|---|---|---|---|---|---|---|---|
M18 | 18.0 | 30.0 | 3.7-4.3 | Rockwell B76 | DIN 1440, ISO 8738 | 10 | 000000000 | 00000 |
Zinc-Plated Steel | ||||||||
M18 | 19.0 | 44.0 | 7.0-9.0 | Rockwell B76 | DIN 7349 | 5 | 000000000 | 0000 |
M18 | 20.0 | 56.0 | 3.4-4.6 | Rockwell B56 | DIN 9021 | 10 | 000000000 | 00000 |
18-8 Stainless Steel | ||||||||
M18 | 20.0 | 56.0 | 3.4-4.6 | Rockwell B75 | DIN 9021 | 1 | 000000000 | 0000 |
Black-Oxide 18-8 Stainless Steel | ||||||||
M18 | 20.0 | 56.0 | 3.4-4.6 | Rockwell B68 | DIN 9021 | 1 | 000000000 | 0000 |
316 Stainless Steel | ||||||||
M18 | 20.0 | 56.0 | 3.4-4.6 | Rockwell B75 | DIN 9021 | 1 | 000000000 | 0000 |
Metric Plastic Washers

These plastic washers are good electrical insulators.
Lubricant-filled nylon washers have a slippery surface that resists wear in high-friction applications.
UHMW washers have excellent moisture and abrasion resistance and good resistance to chemicals.
For technical drawings and 3-D models, click on a part number.
Metric Chemical-Resistant Plastic Washers

These washers surpass most other plastic washers when it comes to withstanding chemicals, oil, and grease. All are excellent electrical insulators.
PTFE washers withstand high temperatures and have a slippery surface that resists wear in high-friction applications.
PVC washers resist acids and alkalies.
For technical drawings and 3-D models, click on a part number.
Metric Electrical-Insulating Plastic Washers

These washers are excellent electrical insulators.
Polypropylene washers resist organic solvents and degreasing agents.
For technical drawings and 3-D models, click on a part number.
For Screw Size | ID, mm | OD, mm | Thick., mm | Max. Temperature, °F | Hardness | Pkg. Qty. | Pkg. | |
Polypropylene Plastic | ||||||||
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Off-White | ||||||||
M18 | 19 | 34.0 | 3.0-3.3 | 150° | Rockwell R101 | 5 | 000000000 | 00000 |
Metric Water- and Steam-Resistant Plastic Washers

Low moisture absorption and good heat resistance make these washers suitable for wet and harsh environments. All are good electrical insulators.
Delrin® acetal plastic washers combine a slippery, wear-resistant surface with good strength and rigidity.
For technical drawings and 3-D models, click on a part number.
For Screw Size | ID, mm | OD, mm | Thick., mm | Max. Temperature, °F | Hardness | Color | Pkg. Qty. | Pkg. | |
Delrin® Acetal Plastic | |||||||||
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M18 | 19.1 | 33.7 | 2.7-3.3 | 180° | Not Rated | White | 5 | 000000000 | 000000 |
Metric High-Temperature Plastic Washers

Able to withstand temperatures as high as 450° or 500° F, these are among the most heat resistant plastic washers we carry. They have good resistance to moisture and chemicals.
PEEK washers have excellent tensile strength for high-stress applications.
For technical drawings and 3-D models, click on a part number.
Temperature Range, °F | |||||||||||
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For Screw Size | ID, mm | OD, mm | Thick., mm | Min. | Max. | Hardness | Specifications Met | Color | Pkg. Qty. | Pkg. | |
PEEK Plastic | |||||||||||
M18 | 19.0 | 34.0 | 2.7-3.3 | -20° | 500° | Rockwell M103 | DIN 125 | Beige | 1 | 000000000 | 00000 |
Metric Split Lock Washers









As you tighten a bolt, these metric washers flatten to add tension to the threaded joint and prevent loosening from small amounts of vibration. They meet a DIN or ASME standard for split lock washer dimensions.
Standard split lock washers match with fasteners that have right-hand threads to prevent clockwise rotation. They have uneven split ends that bite into fasteners for a tight grip but won’t work with hardened surfaces. They hold better than curved or wave washers. These washers are not reusable after tightening.
Curved and wave split lock washers can be used with fasteners that have right- or left-hand threads to prevent clockwise and counterclockwise rotation. These washers are reusable—they retain their shape when untightened and will not damage fasteners. Wave washers touch fasteners at more points, so they grip tighter than curved washers. Their shape also compensates for uneven surfaces and tolerance variations.
Stainless steel washers resist corrosion better than steel and are nearly as strong. 18-8 stainless steel washers withstand humid, damp, and washdown environments but will corrode when exposed to salt water and other chlorine solutions. 316 stainless steel washers resist corrosion from wet environments as well as salt water, chlorine solutions, and chemicals. Stronger and more durable than stainless steel, zinc-plated and yellow zinc-plated steel washers withstand wet environments. However, they will corrode in salt water and chlorine solutions. The zinc plating temporarily protects against rust, but once it wears off, the steel will rust.
Steel washers are stronger and resist wear better than zinc-plated steel and stainless steel washers. Use them in dry environments.
For technical drawings and 3-D models, click on a part number.
For Screw Size | ID, mm | OD, mm | Thick., mm | Overall Ht., mm | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||||||
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Standard | |||||||||
M18 | 19.0 | 29.4 | 3.3-3.7 | __ | Not Rated | DIN 127B | 10 | 000000000 | 00000 |
Curved | |||||||||
M18 | 18.2 | 29.4 | 2.7 | 4.5 | Not Rated | DIN 128A | 10 | 000000000 | 00000 |
316 Stainless Steel | |||||||||
Standard | |||||||||
M18 | 19.0 | 29.4 | 3.3-3.7 | __ | Not Rated | DIN 127B | 10 | 000000000 | 0000 |
Zinc-Plated Steel | |||||||||
Standard | |||||||||
M18 | 19.0 | 29.4 | 3.3-3.7 | __ | Rockwell C44 | DIN 127B | 25 | 000000000 | 00000 |
Curved | |||||||||
M18 | 18.2 | 29.4 | 2.7 | 4.5 | Rockwell C44 | DIN 128A | 10 | 000000000 | 0000 |
Wave | |||||||||
M18 | 18.2 | 29.4 | 2.7 | 4.5 | Rockwell C44 | DIN 128B | 10 | 000000000 | 0000 |
Steel | |||||||||
Standard | |||||||||
M18 | 19.0 | 29.4 | 3.3-3.7 | __ | Rockwell C44 | DIN 127B | 50 | 000000000 | 00000 |
Metric Split Lock Washers for Socket Head Screws

Also known as high-collar lock washers, these have smaller outside diameters than standard split lock washers to fit neatly under socket head cap screws. As a screw is tightened, they flatten to add tension to the joint and prevent loosening from small amounts of vibration.
Zinc-plated steel washers are corrosion resistant in wet environments.
18-8 stainless steel washers have good chemical resistance and may be mildly magnetic.
316 stainless steel washers have excellent resistance to chemicals and salt water. They may be mildly magnetic.
For technical drawings and 3-D models, click on a part number.
For Screw Size | ID, mm | OD, mm | Thick., mm | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
Steel with Zinc-Plated Finish | ||||||||
---|---|---|---|---|---|---|---|---|
M18 | 19.0 | 26.4 | 3.3-3.7 | Rockwell C44 | DIN 7980 | 25 | 000000000 | 000000 |
Steel with Black-Oxide Finish | ||||||||
M18 | 19.0 | 26.4 | 3.3-3.7 | Rockwell C44 | DIN 7980 | 25 | 000000000 | 0000 |
18-8 Stainless Steel | ||||||||
M18 | 19.0 | 26.4 | 3.3-3.7 | Not Rated | DIN 7980 | 10 | 000000000 | 0000 |
316 Stainless Steel | ||||||||
M18 | 19.0 | 26.4 | 3.3-3.7 | Not Rated | DIN 7980 | 10 | 000000000 | 0000 |
Belleville Spring Lock Washers for Socket Head Screws



These washers have smaller outside diameters than standard spring lock washers to fit neatly under socket head cap screws. Also known as conical washers, these have a slightly cupped shape that gives them spring-like flexibility to grip tighter than split and tooth lock washers. They minimize loosening from wear, temperature changes, and vibration. Serrations on the top and bottom provide extra gripping power. Load-rated Belleville disc springs are also available.
18-8 stainless steel washers have good chemical resistance and may be mildly magnetic.
For technical drawings and 3-D models, click on a part number.
Spring Lock Washers for Slotted Bearing Nuts


Designed for use with bearing nuts, these lock washers have a conical shape that presses like a spring against bearings, bushings, gears, and pulleys to hold them in place on your threaded shaft or spindle. They also have an inner tab that sits in the shaft or spindle’s keyway to prevent the nut from loosening. Made of steel, they’re strong and flexible.
DIN 462 and DIN 5406 washers meet international standards for lock washer dimensions. Pair DIN 462 washers with DIN 1804 bearing nuts, and DIN 5406 washers with DIN 981 bearing nuts.
For technical drawings and 3-D models, click on a part number.
Tab | |||||||||||
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For Screw Size | ID, mm | OD, mm | Thick., mm | Wd., mm | Dp., mm | Overall Ht., mm | Hardness | Specifications Met | For Bearing Nut Specifications Met | Each | |
Steel | |||||||||||
For Stepped Nuts | |||||||||||
M18 | 18.0 | 34.0 | 1.00 | 5.0 | 2.5 | 4.0 | Not Rated | DIN 462 | DIN 1804 | 000000000 | 00000 |
Metric Spring Lock Washers


The arched shape of these washers presses up against a bolt and down against a nut to prevent loosening from wear, vibration, or temperature changes. Similar to a spring, they flatten out as pressure is applied, helping to absorb shocks. They grip bolts more tightly than split and tooth lock washers. Unlike split lock washers, which can only be tightened in one direction, these washers have a continuous body that can rotate in either direction.
Conical and curved washers are functionally the same, and are often referenced using their DIN specifications. These DIN specifications refer to slight differences in OD and thickness. DIN 6796 is the standard for conical spring lock washers, which are also known as Belleville washers.
Steel washers are stronger and more wear resistant than zinc-plated steel and stainless steel. They are best for dry environments, since moisture will cause them to rust. Zinc-plated washers have an outer layer of zinc that protects the inner steel from rust and extends the life of the washer. Similar to zinc plating, washers with a black phosphate coating are protected from rust in wet environments. They have a black finish that blends in with dark surfaces.
Stainless steel washers are more corrosion resistant than steel, and almost as strong. 18-8 stainless steel washers will hold up in wet and humid environments, but will corrode if exposed to salt water or chemicals.
For technical drawings and 3-D models, click on a part number.
For Screw Size | ID, mm | OD, mm | Thick., mm | Overall Ht., mm | Hardness | Pkg. Qty. | Pkg. | |
Conical—DIN 6796 | ||||||||
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Steel | ||||||||
M18 | 19.0 | 42.0 | 4.5 | 5.80 | Rockwell C42 | 1 | 000000000 | 00000 |
Zinc-Plated Steel | ||||||||
M18 | 19.0 | 42.0 | 4.5 | 5.80 | Rockwell C42 | 1 | 000000000 | 0000 |
Black-Phosphate Steel | ||||||||
M18 | 19.0 | 42.0 | 4.5 | 5.80 | Rockwell C42 | 2 | 000000000 | 0000 |
18-8 Stainless Steel | ||||||||
M18 | 19.0 | 42.0 | 4.5 | 5.80 | Not Rated | 1 | 000000000 | 00000 |
Metric External-Tooth Lock Washers

Teeth on the outside edge of these washers bite into the screw head and joint for a tight grip. Use with fasteners that have heads large enough to make contact with the teeth, such as pan, button, and binding head screws.
Zinc-plated steel washers are corrosion resistant in wet environments.
18-8 stainless steel washers have good chemical resistance and may be mildly magnetic.
For technical drawings and 3-D models, click on a part number.
Metric Internal-Tooth Lock Washers

Internal teeth dig into the screw head while the smooth outside edge won't snag objects. These washers provide greater vibration resistance than split lock washers. Use with fasteners that have small heads, such as fillister and cheese head screws.
Black-oxide steel washers are mildly corrosion resistant in dry environments.
Zinc-plated steel washers resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
Wedge Lock Washers
These two-piece washers provide more locking power than split, tooth, and spring lock washers. Wedges on the inside lock the two pieces together, and serrations on the exterior grip surfaces to resist loosening from high vibration and shifting. Washers are reusable.
316 stainless steel washers have excellent resistance to chemicals and salt water. They may be mildly magnetic.
Zinc-flake-coated steel washers are corrosion resistant in wet environments.
316 stainless steel and zinc-flake-coated steel washers are comparable to NORD-LOCK® Series washers.
For technical drawings and 3-D models, click on a part number.


For Screw Size | ID | OD | Thick. | Hardness | Heat Treatment | Pkg. Qty. | Pkg. | |
316 Stainless Steel | ||||||||
---|---|---|---|---|---|---|---|---|
M18 | 0.770" | 1.140" | 0.120"-0.140" | Rockwell C51 | Case Hardened | 1 | 000000000 | 00000 |
M18 | 0.770" | 1.360" | 0.120"-0.140" | Rockwell C51 | Case Hardened | 1 | 000000000 | 00000 |
Zinc-Flake-Coated Steel | ||||||||
M18 | 0.770" | 1.140" | 0.120"-0.140" | Rockwell C46 | __ | 4 | 000000000 | 0000 |
M18 | 0.770" | 1.360" | 0.120"-0.140" | Rockwell C46 | __ | 2 | 000000000 | 0000 |
Metric Tab Lock Washers



Bend the tab of these metric lock washers against the flats of a hex nut or bolt head to prevent the fastener and washer from turning and loosening due to vibration, wear, or changes in temperature. Their partial cone shape gives these washers spring-like flexibility, so they distribute force and grip tighter than split and tooth lock washers. All meet DIN 432, an international standard for tab washer dimensions.
Steel washers resist wear better than 316 stainless steel, but aren’t as corrosion resistant.
316 stainless steel washers are more corrosion resistant than steel, and nearly as strong. You can expose them to salt water, chlorine solutions, and chemicals without any rusting.
For technical drawings and 3-D models, click on a part number.
Weather-Resistant Rubber Sealing Washers

Sunlight, ozone, and water won’t affect these washers. They create a light duty seal around fasteners to prevent fluids from leaking and damp vibration.
Silicone washers withstand a wider range of temperatures than EPDM washers.
FDA compliant washers are safe for direct contact with food.
For technical drawings and 3-D models, click on a part number.
Temperature Range, °F | |||||||||||
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For Screw Size | ID | OD | Thick. | Min. | Max. | Hardness | Color | Specifications Met | Pkg. Qty. | Pkg. | |
Silicone Rubber | |||||||||||
M18 | 19.000mm | 34.000mm | 1.320mm-1.820mm | -80° | 450° | Durometer 60A | Red | FDA Compliant 21 CFR 177.2600 | 5 | 000000000 | 00000 |
EPDM Rubber | |||||||||||
M18 | 19.000mm | 34.000mm | 1.190mm-1.950mm | -50° | 300° | Durometer 60A | White | FDA Compliant 21 CFR 177.2600 | 25 | 000000000 | 00000 |
Oil-Resistant Rubber Sealing Washers

These washers surpass other rubber washers when it comes to withstanding oil, grease, and fuel. They create a light duty seal around fasteners to prevent fluids from leaking and damp vibration.
Neoprene washers have good abrasion resistance.
FDA-compliant washers are safe for direct contact with food.
For technical drawings and 3-D models, click on a part number.
Temperature Range, °F | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
For Screw Size | ID | OD | Thick. | Min. | Max. | Hardness | Color | Specifications Met | Pkg. Qty. | Pkg. | |
Neoprene Rubber | |||||||||||
M18 | 19.000mm | 34.000mm | 1.168mm-1.981mm | -30° | 220° | Durometer 55A | White | FDA Compliant 21 CFR 177.2600 | 10 | 000000000 | 000000 |
Chemical-Resistant Rubber Sealing Washers

These washers withstand harsh chemicals such as acetic acid and isopropyl alcohol. They create a light duty seal around fasteners to prevent fluids from leaking and damp vibration.
Fluorosilicone washers withstand a wider range of temperatures and are more chemical resistant than Santoprene washers.
For technical drawings and 3-D models, click on a part number.
Metal Sealing Washers

Also known as crush washers, these compress when tightened to form a tighter, more durable seal than rubber washers. They are commonly used to seal fluids such as oil and fuel. Washers are not reusable.
Copper washers are corrosion resistant in wet environments, nonmagnetic, and electrically conductive.
Aluminum washers are lightweight and corrosion resistant in wet environments.
For technical drawings and 3-D models, click on a part number.
Metric Single-Wave Washers


These curved, flexible washers act like springs to compensate for tolerance variations and uneven surfaces. You can also use them to damp vibration.
18-8 stainless steel washers have good chemical resistance and may be mildly magnetic.
For technical drawings and 3-D models, click on a part number.
For Screw Size | ID, mm | OD, mm | Thick., mm | Overall Ht., mm | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||||||
---|---|---|---|---|---|---|---|---|---|
M18 | 19.0 | 34.0 | 1.6 | 6.6 | Not Rated | DIN 137B | 10 | 000000000 | 000000 |