Zhuocheng Black Oxide Stainless Steel Countersunk Finishing Washers #12 (0.306 ID x 0.682 OD x 0.134 Thick)

These are finishing washers that are designed to work with tapered screws, such as flat heads. These finishing washers are used in all types of knife and gun applications, such as handles and sheaths. They work to beautify and secure your screw applications.

Finishing Cup washers in this selection are made of 18-8 stainless steel, with a black oxide finish. Black Oxide Fasteners made from stainless steel, have been chemically treated to alter certain qualities of the material, most notably the color. The treatment also adds a mild corrosion and abrasion resistance (in addition to the plain stainless steel’s nature), and reduces the now black oxide stainless steel fastener’s reflective properties.

Finishing Cup Washers are used to provide a finish and smooth look where the fastener head is flush with the top of the finishing cup washer. Used for their aesthetic look, cup washers are also used under the head of flat or oval head countersunk screws.

Finishing cup washers are commonly used with tapered head screws, such as flat head or oval head, to create a professional finish on the installation surface. Once installed you can see that finish cup washers create a very clean look around a screw head making it appear to be intentionally exposed, instead of just sticking out. Black stainless steel hardware that has been treated in this manner is commonly used in the automotive industry on both car and motorcycle builds. Additionally, this type of stainless fastener finish is often used in gun and knife builds, particularly in the handles, because of its corrosion and abrasion resistant qualities. Of course, black oxide fasteners are also used for their sleek black look as well.