Adaptors and thread converters allow diamond blades, polishing pads, and other accessories with non-standard mounting configurations to be used on standard angle grinders. In stone work the most common applications are snail-lock to threaded conversions and quad-lock systems for specific pad mounting configurations. 

All adaptors specify the input thread (grinder spindle) and output configuration (accessory type). Always confirm thread direction — most angle grinder spindles use reverse thread for safety. Adaptors must be installed correctly to prevent the accessory from unscrewing during use. 

For polishing pads compatible with standard 5/8"-11 threaded grinders see Polishing Pads. For snail-lock pad backing systems see Backup Pads.