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• Collet Chuck accepts all ER20 collets
• Works on all BT30 machines
• Threaded for stop screw type 1 (not included)
• All critical tool holder surfaces precision ground
• Made from hardened alloy steel
• Balanced to G2.5 at 20,000 rpms
• Gage length is 80mm (3.15 inches)
• Concentricity is less than .0001 at collet face
• Collet nut is included
• Mini Collet Nut is slimmer than standard collet nut
• ER20 Mini Nut has an id thread of 24mm X 1.0 pitch. Outside diameter is 1.102 inches (28mm)
• Must use ER20M collet wrench
• Rear thread for pull stud is m12 x 1.75
• View BT30 Pull Studs
• MariTool Part# is BT30-ER20-80M

Balance Spec:	G2.5 @ 20,000 rpms
Collet Grip Range:	.024-.5625 inches
Collet Nut:	ER20M
Collet Size:	ER 20
Concentricity:	< .0001 at Collet Face
Coolant Thru:	Yes
Finish:	Black Oxide
Gage Length:	80mm
Material:	Hardened Alloy Steel
Rear Thread:	M12 x 1.75
Taper:	BT30