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Belleville Spring Lock Washers
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. Load-rated Belleville disc springs are also available.
18-8 stainless steel and 17-7 PH stainless steel washers have good chemical resistance and may be mildly magnetic. 17-7 PH stainless steel washers are stronger than 18-8 stainless steel washers.
For technical drawings and 3-D models, click on a part number.
Metric Split Lock Washers
As a screw is tightened, these metric washers flatten to add tension to the joint, counteracting fatigue around the joint from small amounts of vibration. This makes them a common choice to prevent fasteners from loosening. However, they resist the least amount of vibration compared to other locking washers. They meet a DIN or ASME standard for split lock washer dimensions.
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.
Stronger and more durable than stainless steel, steel washers plated with zinc or galvanized withstand varying degrees of corrosion. Zinc-plated steel and zinc yellow-chromate 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. Black-oxide steel washers have a black residue that forms from being heat treated; the color will wear away over time.
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 | |||||||||
---|---|---|---|---|---|---|---|---|---|
Curved | |||||||||
M5 | 5.1 | 9.2 | 0.9 | 1.5 | Not Rated | DIN 128A | 100 | 000000000 | 000000 |
Wave | |||||||||
M5 | 5.4 | 9.2 | 0.9 | 1.7 | Not Rated | DIN 128B | 25 | 000000000 | 0000 |
Zinc-Plated Steel | |||||||||
Curved | |||||||||
M5 | 5.1 | 9.2 | 0.9 | 1.5 | Rockwell C44 | DIN 128A | 100 | 000000000 | 0000 |
Wave | |||||||||
M5 | 5.1 | 9.2 | 0.9 | 1.5 | Rockwell C44 | DIN 128B | 100 | 000000000 | 0000 |
Zinc Yellow-Chromate Plated Steel | |||||||||
Curved | |||||||||
M5 | 5.1 | 9.2 | 0.9 | 1.5 | Rockwell C44 | DIN 128A | 100 | 000000000 | 0000 |
Black-Oxide Steel | |||||||||
Curved | |||||||||
M5 | 5.1 | 9.2 | 0.9 | 1.5 | Rockwell C44 | DIN 128A | 100 | 000000000 | 0000 |