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The 5C Collet Expanding by Dunham is an essential tool for any machinist or mechanical technician. Its precision engineering provides a strong grip with minimum and maximum tolerances of 0.250 and 15/32, respectively, ensuring stable and accurate tool holdings. The 1.240-20 external thread makes it compatible with a wide range of machines, while its sturdy steel construction guarantees durability and reliability even in heavy-duty applications. With excellent concentricity (TIR) of 0.0005, the 5C Collet Expanding reduces runout and improves overall performance.