Precision Collets ER40 For precision and reliability. For chuck capacity up to 25mm. The precision collets are made with hardened steel to ensure long-lasting durability in any application.

Part #	Inside Dia	Outside Dia.	Clamping Tolerance
27-40040	4	40.8	4 - 3mm
27-40050	5	40.8	5 - 4mm
27-40060	6	40.8	6 - 5mm
27-40070	7	40.8	7 - 6mm
27-40080	8	40.8	8 - 7mm
27-40100	10	40.8	10 - 9mm
27-40120	12	40.8	12 - 11mm
27-40130	13	40.8	13 - 12mm
27-40140	14	40.8	14 - 13mm
27-40160	16	40.8	16 - 15mm
27-40180	18	40.8	18 - 17mm
27-40190	19	40.8	19 - 18mm
27-40200	20	40.8	20 - 19mm
27-40250	25	40.8	25 - 24mm

Q: How often should these be changed?

A: Roughly every 400 - 600 working hours. This is because they lose their elasticity and do not grip evenly and precisely any more.

Q: What is the difference between standard type and ultra precision type?

A: The difference is in the run out rating with ultra precision being twice as accurate as the standard type.