CAT Toolholders
CAT ER Collet Chucks
General Specifications
CAT40 and CAT50 collet chucks for standard ER collets — a versatile holder for drills, end mills, reamers and taps across a wide range of shank sizes.
- Spindle Interface: CAT40 and CAT50 (ANSI B5.50)
- Tool Clamping: ER collet (DIN 6499), ER11 to ER40
- Sizes: Inch gauge lengths 2.5″–8″ (16 CAT40 and 16 CAT50); metric gauge lengths 63–165 mm (14 CAT40 and 11 CAT50)
- Assembly: Load the collet into the nut first, then insert the tool, then tighten the nut onto the holder
| Model | Collet Size CCWS | Nose Dia. BD1 (in) | Gauge Length LPR (in) | Nut | Axial Adjustment Screw | Collet | Weight (kg) |
|---|---|---|---|---|---|---|---|
| CAT40-ER16-2.5" | 16 | 1.26 | 2.5 | CNA-ER16 | EGNK0v | ER16 | 1.08 |
| CAT40-ER16-4" | 16 | 1.26 | 4 | CNA-ER16 | EGNK0v | ER16 | 1.22 |
| CAT40-ER16-5" | 16 | 1.26 | 5 | CNA-ER16 | EGNK0v | ER16 | 1.32 |
| CAT40-ER16-6" | 16 | 1.26 | 6 | CNA-ER16 | EGNK0v | ER16 | 1.43 |
| CAT40-ER20-2.5" | 20 | 1.38 | 2.5 | CNA-ER20 | EGNK0w | ER20 | 1.08 |
| CAT40-ER20-4" | 20 | 1.38 | 4 | CNA-ER20 | EGNK0w | ER20 | 1.3 |
| CAT40-ER20-6" | 20 | 1.38 | 6 | CNA-ER20 | EGNK0w | ER20 | 1.6 |
| CAT40-ER25-2.5" | 25 | 1.65 | 2.5 | CNU-M/RD-ER25 | EGNK0x | ER25 | 1.08 |
| CAT40-ER25-4" | 25 | 1.65 | 4 | CNU-M/RD-ER25 | EGNK0x | ER25 | 1.42 |
| CAT40-ER25-6" | 25 | 1.65 | 6 | CNU-M/RD-ER25 | EGNK0x | ER25 | 1.89 |
| CAT40-ER32-2.75" | 32 | 1.97 | 2.75 | CNU-M/RD-ER32 | EGNK0y | ER32 | 1.08 |
| CAT40-ER32-4" | 32 | 1.97 | 4 | CNU-M/RD-ER32 | EGNK0y | ER32 | 1.45 |
| CAT40-ER32-6" | 32 | 1.97 | 6 | CNU-M/RD-ER32 | EGNK0y | ER32 | 1.95 |
| CAT40-ER40-3" | 40 | 2.48 | 3 | CNU-M/RD-ER40 | EGNK0z | ER40 | 1.28 |
| CAT40-ER40-4" | 40 | 2.48 | 4 | CNU-M/RD-ER40 | EGNK0z | ER40 | 1.77 |
| CAT40-ER40-6" | 40 | 2.48 | 6 | CNU-M/RD-ER40 | EGNK0z | ER40 | 2.02 |
| CAT50-ER16-2.5" | 16 | 1.26 | 2.5 | CNA-ER16 | EGNK0v | ER16 | 3.13 |
| CAT50-ER16-4" | 16 | 1.26 | 4 | CNA-ER16 | EGNK0v | ER16 | 3.21 |
| CAT50-ER16-5" | 16 | 1.26 | 5 | CNA-ER16 | EGNK0v | ER16 | 3.47 |
| CAT50-ER20-2.5" | 20 | 1.38 | 2.5 | CNA-ER20 | EGNK0w | ER20 | 3.17 |
| CAT50-ER20-4" | 20 | 1.38 | 4 | CNA-ER20 | EGNK0w | ER20 | 3.29 |
| CAT50-ER20-6" | 20 | 1.38 | 6 | CNA-ER20 | EGNK0w | ER20 | 3.56 |
| CAT50-ER25-2.5" | 25 | 1.65 | 2.5 | CNU-M/RD-ER25 | EGNK0x | ER25 | 3.13 |
| CAT50-ER25-4" | 25 | 1.65 | 4 | CNU-M/RD-ER25 | EGNK0x | ER25 | 3.47 |
| CAT50-ER25-6" | 25 | 1.65 | 6 | CNU-M/RD-ER25 | EGNK0x | ER25 | 3.85 |
| CAT50-ER32-2.75" | 32 | 1.97 | 2.75 | CNU-M/RD-ER32 | EGNK0y | ER32 | 3.16 |
| CAT50-ER32-4" | 32 | 1.97 | 4 | CNU-M/RD-ER32 | EGNK0y | ER32 | 3.56 |
| CAT50-ER32-6" | 32 | 1.97 | 6 | CNU-M/RD-ER32 | EGNK0y | ER32 | 4.28 |
| CAT50-ER32-8" | 32 | 1.97 | 8 | CNU-M/RD-ER32 | EGNK0y | ER32 | 4.79 |
| CAT50-ER40-3" | 40 | 2.48 | 3 | CNU-M/RD-ER40 | EGNK0z | ER40 | 3.28 |
| CAT50-ER40-6" | 40 | 2.48 | 6 | CNU-M/RD-ER40 | EGNK0z | ER40 | 4.81 |
| CAT50-ER40-8" | 40 | 2.48 | 8 | CNU-M/RD-ER40 | EGNK0z | ER40 | 5.92 |
| Model | Collet Size CCWS | Nose Dia. BD1 (mm) | Gauge Length LPR (mm) | Nut | Axial Adjustment Screw | Collet | Weight (kg) |
|---|---|---|---|---|---|---|---|
| CAT40-ER11-100 | 11 | 19 | 100 | CNA-ER11 | EGZF01 | ER11 | 1.10 |
| CAT40-ER16-63 | 16 | 28 | 63 | CNA-ER16 | EGZF02 | ER16 | 1.22 |
| CAT40-ER16-150 | 16 | 28 | 150 | CNA-ER16 | EGZF02 | ER16 | 1.22 |
| CAT40-ER20-70 | 20 | 34 | 70 | CNA-ER20 | EGZF03 | ER20 | 1.27 |
| CAT40-ER20-100 | 20 | 34 | 100 | CNA-ER20 | EGZF03 | ER20 | 1.40 |
| CAT40-ER25-70 | 25 | 42 | 70 | CNU-M/RD-ER25 | EGZF04 | ER25 | 1.19 |
| CAT40-ER25-100 | 25 | 42 | 100 | CNU-M/RD-ER25 | EGZF04 | ER25 | 1.33 |
| CAT40-ER25-150 | 25 | 42 | 150 | CNU-M/RD-ER25 | EGZF04 | ER25 | 1.49 |
| CAT40-ER32-70 | 32 | 50 | 70 | CNU-M/RD-ER32 | EGZF05 | ER32 | 1.70 |
| CAT40-ER32-100 | 32 | 50 | 100 | CNU-M/RD-ER32 | EGZF05 | ER32 | 2.10 |
| CAT40-ER32-150 | 32 | 50 | 150 | CNU-M/RD-ER32 | EGZF05 | ER32 | 1.44 |
| CAT40-ER40-70 | 40 | 63 | 70 | CNU-M/RD-ER40 | EGZF06 | ER40 | 1.66 |
| CAT40-ER40-100 | 40 | 63 | 100 | CNU-M/RD-ER40 | EGZF06 | ER40 | 1.97 |
| CAT40-ER40-150 | 40 | 63 | 150 | CNU-M/RD-ER40 | EGZF06 | ER40 | 2.39 |
| CAT50-ER11-100 | 11 | 19 | 100 | CNA-ER11 | EGZF01 | ER11 | 1.90 |
| CAT50-ER16-70 | 16 | 28 | 70 | CNA-ER16 | EGZF02 | ER16 | 2.10 |
| CAT50-ER16-135 | 16 | 28 | 135 | CNA-ER16 | EGZF02 | ER16 | 2.55 |
| CAT50-ER20-70 | 20 | 34 | 70 | CNA-ER20 | EGZF03 | ER20 | 3.50 |
| CAT50-ER20-165 | 20 | 34 | 165 | CNA-ER20 | EGZF03 | ER20 | 3.52 |
| CAT50-ER25-70 | 25 | 42 | 70 | CNU-M/RD-ER25 | EGZF04 | ER25 | 3.53 |
| CAT50-ER25-165 | 25 | 42 | 165 | CNU-M/RD-ER25 | EGZF04 | ER25 | 3.55 |
| CAT50-ER32-70 | 32 | 50 | 70 | CNU-M/RD-ER32 | EGZF05 | ER32 | 3.71 |
| CAT50-ER32-100 | 32 | 50 | 100 | CNU-M/RD-ER32 | EGZF05 | ER32 | 3.85 |
| CAT50-ER40-80 | 40 | 63 | 80 | CNU-M/RD-ER40 | EGZF06 | ER40 | 3.92 |
| CAT50-ER40-150 | 40 | 63 | 150 | CNU-M/RD-ER40 | EGZF06 | ER40 | 4.02 |
