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GMT R8 & Straight ER Collet Chucks

GMT R8 & Straight ER Collet Chucks

The high accuracy and wide gripping range of ER collet chucks make them the most versatile and the most popular toolholders in the industry. ER "spring" collets with 8 degree tapers are capable of compressing 0.040", more than any other collet. 


  • Choice of Electroless Nickel Plating or Black Oxide Finish
  • Precision ground collet nut threads
  • Concentricity < 0.0001" at the collet taper
  • Tapers and flange hardened to 55 HRC
  • All CAT40 chucks balanced to G2.5 @ 20,000RPM

Standard Nuts

  • CAT40-ER16-250
  • All ER25 and ER32 Chucks
  • Thicker wall, higher torque capacity
  • Use Standard (STD) wrenches

Slim (Castle) Nuts

  • CAT40-ER16-250S
  • CAT40-ER16-400S
  • R8-ER16S
  • Added clearance / 0.5" diameter
  • Use ER16-SLIM wrenches


R8 Taper - Electroless Nickel

R8-ER16    ER16 Collet Chuck - STD hex nut    
R8-ER16S ER16 Collet Chuck - SLIM NUT    
R8-ER20    ER20 Collet Chuck        
R8-ER25    ER25 Collet Chuck    
R8-ER32    ER32 Collet Chuck
R8-ER40    ER40 Collet Chuck


Straight Shank

S75-ER16    ER16 Chuck, 0.75 Straight Shank    
S100-ER32    ER32 Chuck, 1.00 Straight Shank

Weight 1.00 lbs
Our price: 89.99 CAD (70.30 USD)
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