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Ultra-Precision ER Collet Nuts and Wrenches

used in applications where speeds exceed 10,000 PRM
balanced to G2.5 for 20,000 RPM's
used on collet holders and multi-spindle heads where center or shoulder distances are critical.

low noise operation
longer tool life
more accurate cutting and higher kerf fidelity
compatible with carbide microtools

ER20A Nut

ER20A Hex Nut

ER20M Nut

ER20M Mini Nut

ER-20 wrench

ER20M Castle Wrench

Steel : SCM430
H.R.C. 38-42
Surface Roughness: Ra 1.6um
Deburred & free of sharp edges & corners

purely tangential tightening torque
no radial nut distortion
castle design for high-torque tightening
secure, no-slip design

Type	OD	Length	Thread	Max. Torque
ER 11 Hex Nut	19mm	12mm	M14 x 0.75	18 ft/lbs. (24 N-m)
ER 11 Mini Nut	16mm	12mm	M13 x 0.75	12 ft/lbs. (16 N-m)
ER 16 Hex Nut	28mm	17mm	M22 x 1.5	41 ft/lbs. (56 N-m)
ER 16 Mini Nut	22mm	18mm	M19 x 1.0	18 ft/lbs. (24 N-m)
ER 20 Hex Nut	34mm	19mm	M25 x 1.5	59 ft/lbs. (80 N-m)
ER 20 Mini Nut	28mm	19.5mm	M24 x 1.0	21 ft/lbs. (28 N-m)
ER 25 Hex/UM Slotted	42mm	20mm	M32 x 1.5	77 ft/lbs. (104 N-m)
ER 25 Mini Nut	35mm	21mm	M30 x 1.0	24 ft/lbs. (32 N-m)

CAUTION: If your spindle currently has a HEX nut, it is probably has an ER-A thread. You must use an ER-A spanner!

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	Description	Reviews	Part Number	Price
	ER-11A Collet clamping hex nut, M14 x 0.75		ERPG-ER11A-NUT	$19.95
	ER-11A 17mm Hex wrench (for ER-11A, ER11UM Collet clamping nut)		ERPG-ER11A-SPN	$11.95
	ER-11 High Speed Collet mini-nut, M13 x 0.75		ERPG-ER11M-NUT	$19.95
	ER-11M Castle wrench (for ER-11M Collet mini-nut, and tool-holder)		ERPG-ER11M-SPN	$19.95
	ER-16A High Speed Collet hex nut, M22 X 1.5		ERPG-ER16A-NUT	$19.95
	ER-16 High Speed Collet mini-nut, M19 x 1.0		ERPG-ER16M-NUT	$19.95
	ER-16M Castle wrench (for ER-16M Collet mini-nut, tool-holder and collet adapter)		ERPG-ER16M-SPN	$19.95
	ER-20A High Speed Collet hex nut, M25 X 1.5		ERPG-ER20A-NUT	$19.95
	ER-20A Hex wrench (for ER-20A Collet nut)		ERPG-ER20A-SPN	$14.00
	ER-20 High Speed Collet mini-nut, M24 X 1.0		ERPG-ER20M-NUT	$19.95
	ER-20M Castle wrench (for ER-20M Collet mini-nut)		ERPG-ER20M-SPN	$19.95
	ER-25 High Speed Collet mini-nut, M30 X 1.0		ERPG-ER25M-NUT	$19.95
	ER-25M Castle wrench (for ER-25 Collet mini-nut)		ERPG-ER25M-SPN	$19.95
	ER-32UM toothed spanner wrench (for ER-32UM Collet nut)		ERPG-ER32UM-SPN	$19.95