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The SDM toolholders feature one-touch drill length adjustment without the need for hand tools. Drill projection length can be adjusted by hand by rotating the knurled guide ring on the outside of the toolholder. The axial adjustment range varies from approximately 0.394" to 0.984" (10 mm to 25 mm), depending on the size of the given toolholder.  The toolholders use the company’s FDC collet system, which provides runout accuracy within 0.0002" (5µm) at 4 × D for AA class collets. FDC collets are available from stock in sizes ranging from 0.02" to 0.866" (0.5 mm to 22 mm). FDC–OH and FDC–C coolant collets can accommodate coolant pressure as high as 1,000 psi either through the drill or alongside the drill. The toolholders include a preset screw to prevent cutting tools with tangs from rotating within, and they are available from stock in CAT, BT and HSK styles.
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