BT40ER20A-collet chuck 70L,100L,150L

The standard ER collet is the most widely used clamping system in the world.Made from Alloy spring steel and fully hardened these ER collets are ideal for many machining applications including boring, milling, reaming, tapping and grinding.  Unless specified differently all of our ER collets feature runout of 0.010 micron or less. ,ER collet sizes start at ER8 through ER50. ER20 series collets have a capacity of 1mm-14mm. Each ER20 collet has a range of (1 mm). The size indicated on the collet is the largest size it can hold and can be collapsed smaller within its collapse range of (0.9mm). For example, ER20-3mm can grab a round shank from 3mm diameter to 2.1mm diameter. 

ER20M Spanner for ER20 miniature type nut , tighten it and loosen it

The standard ER collet is the most widely used clamping system in the world.Made from Alloy spring steel and fully hardened these ER collets are ideal for many machining applications including boring, milling, reaming, tapping and grinding.  Unless specified differently all of our ER collets feature runout of 0.010 micron or less. ,ER collet sizes start at ER8 through ER50. ER20 series collets have a capacity of 1mm-14mm. Each ER20 collet has a range of (1 mm). The size indicated on the collet is the largest size it can hold and can be collapsed smaller within its collapse range of (0.9mm). For example, ER20-3mm can grab a round shank from 3mm diameter to 2.1mm diameter. 

Both types hold all ER20 collets from 1 mm to 14 mmMade from alloy steel hardened to 54 – 56rcPrecision ground ID thread and taperER20A Has an id thread of – M25*1.5PER20A Outside diameter is 34 MMNormal key to tighteninginternal cam removes collet when unscrewedMARSTECH CODE IS ER20A HEX TYPE NUT ER20M Has an id thread of 24mm X 1.0 pitchER20M Outside diameter is 1.102 inches (28mm)Outside has castle notches for tighteningER20M-Wrench works on this collet nutMARSTECH CODE IS ER20M TYPE NUT