RD Series electro-permanent magnetic chucks offer the ultimate workholding solution for turning and rotary grinding of ferrous rings and discs. The electrically switched, permanent magnet technology requires no electrical power during use making it fail-safe and allowing cables to be disconnected for rotation. The radial, T-slotted poles allow the use of either fixed or self-shimming pole extensions to raise the part and allow ID, face and OD machining in a single set-up while eliminating clamping distortion. The SM version of these chucks has exceptional demagnetization capabilities, even for hard alloy steel rings. The RD chucks offer exceptional holding power and will typically exceed the capabilities of mechanical chucks for holding thin, flexible rings and discs.