Outside D-Shaped Washer Frequently Asked Questions
Below are answers to some of the most common questions about outside D-shaped washers.
What are outside D-shaped washers?
Outside D-shaped washers feature a flat edge on the outer diameter, giving the washer a D-shaped outer profile with a round inner bore. The flat on the OD allows the washer to seat flush against a wall, channel, slot edge, or structural member where a fully round washer would not fit or seat properly. Superior Washer stocks 45 outside D-shaped configurations covering IDs from 0.089" to 0.94" and ODs from 0.187" to 2.25", with a custom 'B' dimension defining the flat-to-center measurement.
What is the 'B' dimension on outside D-shaped washers?
The B dimension is the measurement from the center of the round ID to the flat edge on the OD. It defines how far the flat extends relative to the washer center and is a key specification when fitting the washer against an edge, channel, or wall feature. B dimensions in the stocked catalog range from 0.166" to 1.937".
What applications use outside D-shaped washers?
Outside D-shaped washers are used wherever a standard round washer cannot seat flush against an adjacent structural feature. Common applications include mounting against channel edges, T-slots, panel cutouts, and structural angles in electronics enclosures, machinery frames, and architectural metalwork. The D-shaped OD also prevents the washer from rotating in a slot.
What materials are outside D-shaped washers available in?
Outside D-shaped washers are produced in steel, stainless steel, brass, and aluminum. The 45-configuration stock catalog covers a wide range of sizes; custom materials and dimensions are available to order.
Can you produce custom outside D-shaped washers?
Yes. With 45 stocked sizes and our in-house tooling capability, we can also produce custom outside D-shaped washers to your exact OD, ID, thickness, and B dimension. Contact us via the Quick Quote form or call NY (631) 273-8282 or SC (803) 366-3250.
Are your outside D-shaped washers made in the USA?
Yes. All outside D-shaped 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 flat ID instead of a flat OD? Browse the full flat washers catalog to see all shapes and materials available.
