ER-25 7/16" Coolant Spring Collet (3900-5761) ~ Designed for use with cylindrical shank tools, not flats. ~ Cutting tool should be inserted the full length of the collet. If these conditions are not met, coolant leakage may result. ~ Runout is <= .0005". ~ Meets DIN 6499B. ~ Collapse Range is .433 to .472". ~ D1 Major diameter is 1.020". ~ Overall length is 1.390".
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