3M 81729 817 Series Retainer Nut Ribbed Disc Pad Face Plate, 9 in Dia, Disc Pad Hub Attachment Black

3M™ disc pad face plate backs a same size fiber disc to provide firm support and the force required for grinding applications. It is used in conjunction with a disc pad hub, which attaches to the power tool and held into place along with the appropriate disc using a retainer nut. This assembly allows 3M™ disc pad face plate to be easily changed without removing the disc pad hub, allowing the operator to use a single tool for multiple applications from heavy grinding to finishing a workpiece. Some face plates have ribbing on the bottom face. Ribbed face plates provide additional force when needed for optimal fracturing of the abrasive mineral. By reducing the area of contact or pressure per square foot (PSI), ribbed face plates increase the grinding pressure of the abrasive with the same amount of operator effort and extend disc life when dulling is a problem.
Ribbed faceplate results in a cooler running disc. Use with 9" diameter x 7/8" Fibre Discs. Use with 4-1/2" Disc Pad Hub or 2-1/2" hub for more flexibility. Hard - Black. Find the right for the right job.