CNC router tools for woodworking, metal machining, plastic cutting and composite cutting with precision collets and toolholders
Think & Tinker, Ltd.
CNC router bits and carbide cutting tools with tutorials and technical guides

the tools
you need!

Ultra-Precision ER Collet Nuts


  • 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

Please read the "Working with ER Nuts and Collets" turorial.

ER20A Hex Nut

ER20A Hex Nut


ER20M Mini Nut


  • purely tangential tightening torque
  • no radial nut distortion
  • castle design for high-torque tightening
  • secure, no-slip design
  • must be used with Think & Tinker ER-mini nuts

Er-20 wrench

ER-M Castle Wrench

Part No. Description OD Length Thread Max. Torque
ERPG-ER11M-NUT ER 11 Mini Nut 16mm 12mm M13 x 0.75 14 ft/lbs. (19 N-m)
ERPG-ER16M-NUT ER 16 Mini Nut 22mm 18mm M19 x 1.0 22 ft/lbs. (30 N-m)
ERPG-ER20A-NUT ER 20 Hex Nut 34mm 19mm M25 x 1.5 25 ft/lbs. (34 N-m)
ERPG-ER20M-NUT ER 20 Mini Nut 28mm 19.5mm M24 x 1.0 25 ft/lbs. (34 N-m)
ERPG-ER25M-NUT ER 25 Mini Nut 35mm 21mm M30 x 1.0 29 ft/lbs. (39 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!

Collets Collet

If your purchase is over US$50,
you save $5 in shipping!
    Sales Items    
Item # Description Unit Price Enter Qty.
ERPG-ER11M-NUT  ER-11 High Speed Collet mini-nut, M13 x 0.75 ER-11   $19.95 
ERPG-ER11M-SPN  ER-11M Castle wrench (for ER-11M Collet mini-nut, and tool-holder)   $14.00 
ERPG-ER16M-NUT  ER-16 High Speed Collet mini-nut, M19 x 1.0   $19.95 
ERPG-ER16M-SPN  ER-16M Castle wrench (for ER-16M Collet mini-nut, tool-holder and collet adapter)   $14.00 
ERPG-ER20A-NUT  ER-20A High Speed Collet hex nut, M25 X 1.5   $19.95 
ERPG-ER20A-SPN  ER-20A Hex wrench (for ER-20A Collet nut)   $14.00 
ERPG-ER20M-NUT  ER-20 High Speed Collet mini-nut, M24 X 1.0   $19.95 
ERPG-ER20M-SPN  ER-20M Castle wrench (for ER-20M Collet mini-nut)   $14.00 
ERPG-ER25M-NUT  ER-25 High Speed Collet mini-nut, M30 X 1.0   $19.95 
ERPG-ER25M-SPN  ER-25M Castle wrench (for ER-25 Collet mini-nut)   $14.00 
ERPG-ER32B-NUT  M40 X 1.5 ER-32B Collet nut (slotted)   $35.00 
ERPG-ER32E-SPN  ER-32E Hand wrench (slotted for ER-32B collet nut)   $20.00 
Enter the desired quantity (Enter Qty) then click on the "Add to Cart" Button.

Open Monday - Friday, 08:30 to 16:30 Mountain Time.

Most orders received before noon ship within one business day,
subject to credit approval and item availability.
Orders with different billing and shipping
addresses may be delayed for address verification.

Sales  719 488-9640
FAX:  866-453-8473
Accepted Credit CardsPayPal Accepted Here

Payment Processing
Support  719 488-9640

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Updated 4/25/2017 5:06:01 PM