Patent ID: 8752843

Claim:
A collet ( 14 ) having a longitudinal collet axis (A) and comprising, angled seal bores ( 50 ) formed in interspaces ( 34 ) of the collet ( 14 ), each seal bore ( 50 ) comprising a peripheral side wall ( 51 ) and extending between an inner end ( 52 ) and an outer end ( 54 ) thereof; the collet ( 14 ) comprising a longitudinal clamping bore ( 36 ) and a peripheral surface ( 38 ) extending between a tool end and a holder end of the clamping bore ( 36 ), the clamping bore ( 36 ) comprising a clamping surface ( 42 ) extending from the tool end; wherein: the seal bores ( 50 ) extend at an acute angle α to the collet axis (A), from the clamping surface ( 42 ) to the peripheral surface ( 38 ), towards the tool end; proximate the inner end ( 52 ), a bottom wall ( 53 ) protrudes into the seal bore ( 50 ), relative to the peripheral side wall ( 51 ); and due to the protrusion of bottom wall ( 53 ) into the seal bore ( 50 ), the inner end ( 52 ) of each of the seal bores ( 50 ) only partially intersects the clamping bore ( 36 ) such that less than an entire cross-section of each of the seal bores ( 50 ) opens out into the clamping bore ( 36 ).