Home | Oval ID Washers - Specialty Flat Washers with Oval Inner Bore
Oval ID Washers - Specialty Flat Washers with Oval Inner Bore

Oval ID Washers - Specialty Flat Washers with Oval Inner Bore

Showing 1–21 of 21 products

SKU Thickness A B C Quantity

250-10-025

Thickness 0.025
A 0.218
B 0.141
C 0.125
Quantity

250-10-040

Thickness 0.04
A 0.218
B 0.141
C 0.125
Quantity

250-11-025

Thickness 0.025
A 0.29
B 0.141
C 0.125
Quantity

250-12-030

Thickness 0.03
A 0.375
B 0.252
C 0.2
Quantity

250-13-030

Thickness 0.03
A 0.5
B 0.255
C 0.193
Quantity

250-13-040

Thickness 0.04
A 0.5
B 0.255
C 0.193
Quantity

250-14-031

Thickness 0.031
A 0.687
B 0.49
C 0.328
Quantity

250-15-020

Thickness 0.02
A 0.703
B 0.492
C 0.379
Quantity

250-15-031

Thickness 0.031
A 0.703
B 0.492
C 0.379
Quantity

250-16-062

Thickness 0.062
A 0.71
B 0.54
C 0.203
Quantity

250-17-060

Thickness 0.06
A 0.75
B 0.188
C 0.145
Quantity

250-18-043

Thickness 0.043
A 0.75
B 0.253
C 0.191
Quantity

250-19-015

Thickness 0.015
A 0.75
B 0.314
C 0.245
Quantity

250-19-025

Thickness 0.025
A 0.75
B 0.314
C 0.245
Quantity

250-20-062

Thickness 0.062
A 0.82
B 0.313
C 0.251
Quantity

250-21-030

Thickness 0.03
A 0.875
B 0.377
C 0.314
Quantity

250-22-060

Thickness 0.06
A 0.88
B 0.376
C 0.289
Quantity

250-23-064

Thickness 0.064
A 0.891
B 0.376
C 0.302
Quantity

250-24-040

Thickness 0.04
A 0.937
B 0.252
C 0.182
Quantity

250-25-090

Thickness 0.09
A 1.0
B 0.376
C 0.302
Quantity

250-26-040

Thickness 0.04
A 1.062
B 0.252
C 0.182
Quantity

Oval ID Washer Frequently Asked Questions

Below are answers to some of the most common questions about oval ID washers.

What are oval ID washers?
Oval ID washers are flat washers with an elliptical inner bore rather than a round hole. The oval bore accommodates oval-headed or offset fasteners and provides secure clamping and load distribution in assemblies where a round-bore washer cannot be properly seated. Superior Washer stocks 21 oval ID configurations described by three key dimensions: A (major axis of the oval bore), B (minor axis of the oval bore), and C (the offset measurement from bore center). Sizes range from OD A dimensions of 0.218" to 1.062".

How are oval ID washers dimensioned?
Oval ID washers are defined by three bore measurements: A (the long axis of the oval opening), B (the short axis of the oval opening), and C (the distance from the geometric center of the oval bore to the reference point, representing the offset or eccentricity of the bore). These three dimensions fully describe the oval bore geometry. Thickness ranges from 0.015" to 0.090" across the stocked catalog.

What applications use oval ID washers?
Oval ID washers are used in lighting fixtures, automotive assemblies, cabinetry hardware, and equipment panels where oval or oblong fastener heads must be accommodated, or where an offset bore is required to align with a non-centered fastener pattern. They are also used as adjustment washers in slotted mounting holes.

What materials are oval ID washers available in?
Oval ID washers are produced in steel, stainless steel, brass, and aluminum. Contact us to specify the material required for your application and size.

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

Are your oval ID washers made in the USA?
Yes. All oval ID 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 an oval OD instead of an oval bore? Browse the full flat washers catalog to see all shapes and materials available.