Stainless Plate Products, Inc.
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Stainless Steel Plate Flanges


These plate flange reference tables detail outside and inside diameter sizes and bolt hole drilling pattens for various standard plate flanges. They are intended for estimating purposes only. Applications vary, confirm all dimensions with your engineering department prior to ordering.

Standard Flanges

Stainless Plate Products produces a wide variety of flat face slip-on flanges (also known as hubless or plate flanges). These high quality plate flanges have a wide variety of applications.



Stainless steel plate flanges are produced from quality mill plate. Mill plate produced to the ASTM A240 and ASME SA240 standards is virtually free of voids, non-metallic inclusions and other defects. The inherent corrosion resistance of stainless steel is enhanced by the superior grain structure offered by plate products over forged or cast products.

As companies begin to look at life-cycle costing models, in almost every case, the slightly higher initial cost of stainless steel plate flanges is more than offset by the extended service life and the reduction of the normal maintenance costs.

Stainless steel plate flanges are a widely accepted alternative to cast or forged flanges in low pressure applications.



Standard plate flange with a raised face.

slip-on type plate flange


Standard plate flange with a raised face but no inside diameter.

blind plate flange

Angle Face Ring

Standard plate flange with a raised face and inside diameter chamfer.

angle face plate flange

Lap Joint

Similar to the angle face plate flange but with a radius on the inside diameter instead of a chamfer.

lap joint plate flange

Socket Weld

Standard plate flange with raised face on the top and bottom, and in inside diameter counter bore.

socket weld plate flange

Studding Outlet

Standard plate flange with a raised face and blind, drilled and tapped holes.

studding outlet plate flange

Specialty Plate Flanges

In addition to our stock of standard flanges, we also offer specialty plate flange products which include machining details such as gasket surfaces, non-standard drilling, facing details, bevel and radius edges, o-ring grooves and raised or recessed faces. Some typical examples are shown below.

Raised Face

raised face, a-a section

Counter Bore

id counter bore, a-a section


id radius, a-a section


id chamfer, a-a section

O-Ring Groove

o-ring groove, a-a section

Gasket Surface

Standard plate flanges can be customized to suit your application with a variety of machining details. The a-a section drawings below show some of the possibilities.
  Stainless Plate Products, Inc.
1235 Manor Road
Coatesville, PA 19320
800-523-7532, 610-384-3910 fax