Expanding Mandrels

• 360° Uniform Radial Expansion: Unlike traditional three-jaw chucks or collets, the hydraulic system provides full-circumference radial pressure. This ensures evenly distributed clamping force and significantly reduces the risk of workpiece deformation.

• Superior Concentricity & Repeatability: Hydraulic transmission eliminates mechanical backlash, delivering exceptional repeatability (down to the micron level) and substantially increasing production yield rates.

• The Ideal Solution for Thin-Walled Parts: The gentle and uniform distribution of compressive stress makes it perfect for machining thin-walled sleeves, precision gears, and precision bearing housings—parts that are highly susceptible to distortion.

• High Rigidity & Vibration Damping: The internal hydraulic fluid possesses natural shock-absorbing properties, effectively suppressing micro-vibrations during machining to optimize surface roughness (Ra values).

• Made to Your Part Drawing: Mongtec is a supplier of custom hydraulic expanding mandrels, each one built around the customer's part drawing for gear grinding, gear inspection, OD grinding and finish turning. The part bore should be IT7 or better; maximum expansion is 0.3–0.5% of the clamping diameter. Send the part drawing for a quote.