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The flat round washer is fully machined and manufactured from 4140 alloy steel that is hardened to Rockwell C40-C50 and coated with black oxide for lubricity. Its tight dimensional tolerances make it suitable for precision applications.
The washer is made from 4140 steel, a chromium-molybdenum steel alloy. The benefits of alloy steel include its tensile strength, yield strength, fatigue resistance, toughness, and wear resistance. Steels are designated by a four-number SAE Steel grade. The first two digits indicate the primary materials used to form the steel. The last two digits identify the percentage of carbon for the alloy (in hundredths). The black oxide coating provides some lubricity to the product, meaning that there is less friction generated when using these products. The coating also provides a mild corrosion resistance but should not be relied on in environments where corrosion resistance is a primary concern. The washer’s size corresponds to matching screw or bolt size. Washer is made in the USA.
Washers have a variety of purposes. They can distribute the load of a threaded fastener and can also be used as spacers, springs, shims, and locking devices. Washers can be measured in inches or in millimeters, and typically have an outer diameter about twice as large as the inner diameter.
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