Home | Inside D-Shaped Washers - Specialty Washers with Flat ID Profile
Inside D-Shaped Washers - Specialty Washers with Flat ID Profile

Inside D-Shaped Washers - Specialty Washers with Flat ID Profile

Showing 1–7 of 7 products

SKU ID OD Thickness C Quantity

150-10-016

ID 0.126
OD 0.234
Thickness 0.016
C 0.114
Quantity

150-11-040

ID 0.244
OD 0.346
Thickness 0.04
C 0.206
Quantity

150-12-047

ID 0.323
OD 0.493
Thickness 0.047
C 0.265
Quantity

150-13-050

ID 0.312
OD 0.5
Thickness 0.05
C 0.25
Quantity

150-14-010

ID 0.375
OD 0.75
Thickness 0.01
C 0.328
Quantity

150-15-050

ID 0.227
OD 0.98
Thickness 0.05
C 0.253
Quantity

150-16-031

ID 0.375
OD 1.12
Thickness 0.031
C 0.343
Quantity

Inside D-Shaped Washer Frequently Asked Questions

Below are answers to some of the most common questions about inside D-shaped washers.

What are inside D-shaped washers?
Inside D-shaped washers are flat washers with a flat edge machined or stamped on the inner diameter bore, creating a D-shaped opening rather than a round hole. This flat edge locks onto D-profile shafts and fasteners to prevent rotation, making them essential in mechanical and electronic assemblies where a shaft must be secured against angular movement. Superior Washer stocks 7 inside D-shaped configurations with IDs from 0.126" to 0.375" and ODs from 0.234" to 1.12".

What is the 'C' dimension on inside D-shaped washers?
The C dimension refers to the chord measurement across the flat edge of the D-shaped bore. It defines the width of the flat section of the inner opening and is a key specification when matching the washer to a D-profile shaft. All Superior Washer inside D-shaped washers are listed with their C dimension in the product catalog. C dimensions in the current stock range from 0.114" to 0.343".

What applications use inside D-shaped washers?
Inside D-shaped washers are used in potentiometers, rotary encoders, electric motors, gear assemblies, and any mechanical application where a washer must index to a D-shaped shaft and prevent free rotation. They are common in electronics, instrumentation, appliances, and power transmission equipment.

What materials are inside D-shaped washers available in?
Superior Washer inside D-shaped washers are produced in steel, stainless steel, brass, and aluminum. Material availability varies by size. Contact us via the Quick Quote form or by phone to specify your required material.

Can you produce custom inside D-shaped washers?
Yes. If our stocked configurations do not match your ID, OD, thickness, or C dimension requirement, we manufacture custom inside D-shaped washers to your exact specifications. Contact us at NY (631) 273-8282 or SC (803) 366-3250, or use the Quick Quote form on our website.

Are your inside D-shaped washers made in the USA?
Yes. All inside D-shaped washers are manufactured in the United States at our facilities in Hauppauge, NY (CAGE Code: 1L160) and Rock Hill, SC (CAGE Code: 4WUG7) under our ISO 9001:2015 certified Quality Management System.

Need a different odd-shaped or standard configuration? Browse the full flat washers catalog to see all shapes and materials available.