BLUETEC Collet, SK6 for Slim Chuck HSS Ball Nose End Mill (Coated) Specification item model symbol Specification Specification item model symbol Specification information bearing type M plain bearing tube inner diameter 15 tube inner diameter 15mm Types of port screws M screw Rc1 8 cylinder stroke 50 cylinder stroke 50mm auto switch Without auto switch Built in magnet cylinder Auto switch additional symbol 2 with or without Custom made specifications standard Specification item model symbol Specification information With auto switch D With auto switch Mounting support type B Basic type tube inner diameter 40 tube inner diameter 40mm Types of port screws Rc cylinder stroke 25 cylinder stroke 25mm additional sign No bellows