Gasket Surface Finishes

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Gasket Surface Finishes

Flanges, Welding Necks, and other products designed for bolted connection, when furnished with raised face (or flat faced) may have any type of gasket surface finished that is required. The common finishes are described in the following paragraphs and it should be noted particularly that, unless otherwise specified by the purchaser, the STOCK FINISH, will be furnished.

Stock Finish

From 125 micro inches to 250 micro inches average roughness shall be furnished. The cutting tool employed should have an approximate 0.06 inches or larger radius.

Smooth Finish

This finish, which can be produced by several shapes of tools, shows no definite tool markings apparent to the naked eye. In the past this finish was sometimes known as "Smooth Plane". This term, however, should be avoided because of a tendency to confuse it with "flat faced" which, of course, applies to the flange facing and not to the gasket surface finish.

Cold Water Finish

Producing by using a wide tool at high speeds, this finish is equivalent to that of a ground surface. It is mirror like in appearance and surfaces finished in this manner are usually expected to be used without gaskets.

Spiral Serrated

This too, is a continuous spiral groove, but it differs from the stock finish in that the groove is generated with a 90^o included angle "V" tool. This groove is 1/64" deep and the feed is 1/32" for all sizes.

Concentric Serrated

As the name suggests this surface finish is made up of concentric grooves. A 90^o included angle "V" tool is used and the grooves are 1/64" deep and 1/32" apart.