Slotted Round Washers - Adjustable Flat Washers with Radial Slots

Slotted Round Washer Frequently Asked Questions

Below are answers to some of the most common questions about slotted round washers.

What are slotted round washers?
Slotted round washers are flat washers with a radial slot cut from the inner bore to the outer edge, allowing the washer to be slipped over a fastener shank without fully removing the fastener from the assembly. This feature makes them ideal for applications requiring frequent adjustment, quick maintenance access, or removal without full disassembly. Superior Washer stocks 7 slotted round configurations with ODs from 0.437" to 1.000" and thicknesses of 0.031", 0.062", and 0.093".

Why would I use a slotted round washer instead of a standard flat washer?
A standard flat washer requires the fastener to be fully removed for installation or removal. A slotted round washer can be slid onto the fastener shank laterally through the slot, allowing placement and removal with the fastener only loosened rather than removed. This saves significant time in assemblies requiring frequent maintenance, adjustment, or access, such as panel mounting, conveyor systems, and adjustable machine guards.

What applications use slotted round washers?
Slotted round washers are used in conveyor equipment, machine guarding, panel and door mounting, electrical enclosures, and other assemblies where washers must be installed or removed quickly without fully disassembling fastener joints. They are also used as adjustment washers in applications where the washer must be repositioned without nut removal.

What materials are slotted round washers available in?
Slotted round washers are produced in steel, stainless steel, brass, and aluminum. Contact us to specify the material required for your application.

Can you produce custom slotted round washers?
Yes. We manufacture custom slotted round washers to your OD, ID, slot width, and thickness specifications. Contact us via the Quick Quote form or call NY (631) 273-8282 or SC (803) 366-3250.

Are your slotted round washers made in the USA?
Yes. All slotted round washers are manufactured in the United States under our ISO 9001:2015 certified Quality Management System at our Hauppauge, NY and Rock Hill, SC facilities.

Need a slotted square profile instead? Browse the full flat washers catalog to see all shapes and materials available.