Our 3M Disc Pad Hub enables operators to select face plates with four different levels of flexibility (soft, medium, hard and extra-hard). The disc pad hub holds a face plate firmly in position, and a center hole fiber disc is secured to the tool spindle with the retainer nut.
Disc pad hub and retainer nut has a M14-2 INT thread for use on grinders with M14-2 threaded spindle and can be used on all 3M Fiber Disc face plates. Use with 4-1/2 inch through 9 inch Fiber Discs with 7/8″/22mm center hole.

3M 87449 Silver Depressed Center Grinding Wheel, T27 Quick Change, 9 in x 1/4 in x 5/8-11 Center Hub Thread, 7010409732, 20 per case
Standard Abrasives 710335, A/O Straight Cartridge Roll, 1/4 in x 1 in x 1/8 in 60, 7100080015
ACS-CP Curved Edge Flap Disc, 4-1/2" Dia. X 5/8"-11 Center Thread, 60 Grit
Norton 66623303912 - 2" Dia. XCS Grit Aluminum Oxide Type III, Bear-Tex Non-Woven Quick-Change Disc, 25 Each
Dynabrade 56106 5" Dia. Non-Vacuum Disc Pad, Vinyl-Face 
