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Originally Posted On: Washer Wisdom: Other Specialty Washers (mudgefasteners.com)
Certain applications require specialty washers that don’t necessarily fit into one of the earlier specified categories of flat washers, spring washers, lock washers and structural washers. Here we will look at three of the most common specialty washers used in industrial applications.
Tab washers are a less common type of lock washer, featuring a tab that can be bent up against the flat of a bolt head or hex nut, thereby preventing rotation of both the washer and bolt or nut. The tabs on these types of washers can be internal or external, can have one tab or multiple tabs, and can be manufactured in large outer diameters of up to 12 inches.
Slotted Washers (C Washers)
Slotted washers feature a slot in the side that creates the appearance of the letter C and allows the user to install and remove the washer without completely disassembling the joint. Slotted washers can be used in a variety of ways, but are often used as shims or as a way to increase productivity in the process of repositioning an assembly.
Finishing Washers (Countersunk Washers)
Finishing washers, also known as countersunk washers, are used primarily for decorative appearance. A countersunk screw can be recessed into the finishing washer to create a flush, flat surface, therefore also creating a very clean appearance.
If you have further questions about specialty washers, please don’t hesitate to contact us for more information.