Slip-on flanges can be made from a number of different materials depending on the piping material and the requirements of the application. Selection depends on factors such as environmental corrosion, operating temperature, low pressure, and the economy. Some of the most common materials include carbon steel, alloy steel, stainless steel, cast iron, copper, and PVC.

Slip-On flanges or SO flanges are commonly lower in price than weld-neck flanges, and to this effect are a popular choice for our customers. However, customers should bear in mind that this initial cost saving may be diminished by the additional cost of the two fillet welds required for proper installation. Moreover, weld-neck flanges have a higher life expectancy than slip-on flanges under duress.

Slip-on Flange is essentially a ring that is placed over the pipe end, with the flange face extending from the end of the pipe by enough distance to apply a weld bead on the inside diameter.

The OD of the slip-on flange is also welded on the backside of the flange. Slip-on flanges have a lower material cost than weld neck flange and are more easily aligned.

The slip-on flange may also be used a lap joint flanges if Type B or Type C stub ends are used.