CAT V flange ER collet chuck in CAT40 and CAT50, six ER sizes from ER16 to ER50, ground to ≤0.005mm (≤0.0002") runout. Gage lengths are offered at 2.76", 3.15", 4", 6" and 8" — the dimension US shops quote when they order — across 36 models. Built to ANSI B5.50, the V flange steep taper standard for CAT tool holders, from 20CrMnTi alloy steel vacuum quenched to HRC 56-58 and balanced for high-speed work. Any standard ER collet fits this holder. The nut ships with it; collets, wrench and pull stud are ordered separately.
| Cart+ | SKU | Price | Quantity | Total | L | L1 | D | d1 | d2 | d3 | T |
|---|---|---|---|---|---|---|---|---|---|---|---|
CAT40-ER16-2.76 | $24 | $0 | 5.447″ | 2.76″ | 2.5″ | 1.102″ | 0.63″ | 1.75″ | M10*1.5P | ||
CAT40-ER16-4 | $24 | $0 | 6.687″ | 4″ | 2.5″ | 1.102″ | 0.63″ | 1.75″ | M10*1.5P | ||
CAT40-ER16-6 | $24 | $0 | 8.687″ | 6″ | 2.5″ | 1.102″ | 0.63″ | 1.75″ | M10*1.5P | ||
CAT40-ER16-8 | $30 | $0 | 10.687″ | 8″ | 2.5″ | 1.102″ | 0.63″ | 1.75″ | M10*1.5P | ||
CAT40-ER20-2.76 | $24 | $0 | 5.447″ | 2.76″ | 2.5″ | 1.339″ | 0.788″ | 1.75″ | M12*1.75P | ||
CAT40-ER20-4 | $24 | $0 | 6.687″ | 4″ | 2.5″ | 1.339″ | 0.788″ | 1.75″ | M12*1.75P | ||
CAT40-ER25-2.76 | $24 | $0 | 5.447″ | 1.76″ | 2.5″ | 1.654″ | 0.984″ | 1.75″ | M16*2.0P | ||
CAT40-ER25-4 | $24 | $0 | 6.687″ | 4″ | 2.5″ | 1.654″ | 0.984″ | 1.75″ | M16*2.0P | ||
CAT40-ER25-6 | $30 | $0 | 8.687″ | 6″ | 2.5″ | 1.654″ | 0.984″ | 1.75″ | M16*2.0P | ||
CAT40-ER25-8 | $36 | $0 | 10.687″ | 8″ | 2.5″ | 1.654″ | 0.984″ | 1.75″ | M16*2.0P | ||
CAT40-ER32-2.76 | $24 | $0 | 5.447″ | 2.76″ | 2.5″ | 1.969″ | 1.26″ | 1.75″ | M16*2.0P | ||
CAT40-ER32-4 | $24 | $0 | 6.687″ | 4″ | 2.5″ | 1.969″ | 1.26″ | 1.75″ | M16*2.0P | ||
CAT40-ER32-6 | $30 | $0 | 8.687″ | 6″ | 2.5″ | 1.969″ | 1.26″ | 1.75″ | M16*2.0P | ||
CAT40-ER32-8 | $36 | $0 | 10.687″ | 8″ | 2.5″ | 1.969″ | 1.26″ | 1.75″ | M16*2.0P | ||
CAT40-ER40-3.15 | $30 | $0 | 5.837″ | 3.15″ | 2.5″ | 2.48″ | 1.575″ | 1.75″ | M20*2.0P | ||
CAT40-ER40-4 | $30 | $0 | 6.687″ | 4″ | 2.5″ | 2.48″ | 1.575″ | 1.75″ | M20*2.0P | ||
CAT40-ER40-6 | $36 | $0 | 8.687″ | 6″ | 2.5″ | 2.48″ | 1.575″ | 1.75″ | M20*2.0P | ||
CAT40-ER50-4 | $41 | $0 | 6.687″ | 4″ | 2.5″ | 3.07″ | 1.969″ | 1.75″ | M24*3.0P | ||
CAT50-ER16-4 | $51 | $0 | 8″ | 4″ | 3.875″ | 1.102″ | 0.63″ | 2.75″ | M10*1.5P | ||
CAT50-ER16-6 | $62 | $0 | 10″ | 6″ | 3.875″ | 1.102″ | 0.63″ | 2.75″ | M10*1.5P | ||
CAT50-ER16-8 | $72 | $0 | 12″ | 8″ | 3.875″ | 1.102″ | 0.63″ | 2.75″ | M10*1.5P | ||
CAT50-ER20-4 | $51 | $0 | 8″ | 4″ | 3.875″ | 1.339″ | 0.788″ | 2.75″ | M12*1.75P | ||
CAT50-ER20-6 | $62 | $0 | 10″ | 6″ | 3.875″ | 1.339″ | 0.788″ | 2.75″ | M12*1.75P | ||
CAT50-ER20-8 | $72 | $0 | 12″ | 8″ | 3.875″ | 1.339″ | 0.788″ | 2.75″ | M12*1.75P | ||
CAT50-ER25-4 | $53 | $0 | 8″ | 4″ | 3.875″ | 1.654″ | 0.984″ | 2.75″ | M16*2.0P | ||
CAT50-ER25-6 | $66 | $0 | 10″ | 6″ | 3.875″ | 1.654″ | 0.984″ | 2.75″ | M16*2.0P | ||
CAT50-ER25-8 | $79 | $0 | 12″ | 8″ | 3.875″ | 1.654″ | 0.984″ | 2.75″ | M16*2.0P | ||
CAT50-ER32-4 | $55 | $0 | 8″ | 4″ | 3.875″ | 1.969″ | 1.26″ | 2.75″ | M16*2.0P | ||
CAT50-ER32-6 | $68 | $0 | 10″ | 6″ | 3.875″ | 1.969″ | 1.26″ | 2.75″ | M16*2.0P | ||
CAT50-ER32-8 | $81 | $0 | 12″ | 8″ | 3.875″ | 1.969″ | 1.26″ | 2.75″ | M16*2.0P | ||
CAT50-ER40-4 | $58 | $0 | 8″ | 4″ | 3.875″ | 2.48″ | 1.575″ | 2.75″ | M20*2.0P | ||
CAT50-ER40-6 | $70 | $0 | 10″ | 6″ | 3.875″ | 2.48″ | 1.575″ | 2.75″ | M20*2.0P | ||
CAT50-ER40-8 | $83 | $0 | 12″ | 8″ | 3.875″ | 2.48″ | 1.575″ | 2.75″ | M20*2.0P | ||
CAT50-ER50-4 | $64 | $0 | 8″ | 4″ | 3.875″ | 3.07″ | 1.969″ | 2.75″ | M24*3.0P | ||
CAT50-ER50-6 | $77 | $0 | 10″ | 6″ | 3.875″ | 3.07″ | 1.969″ | 2.75″ | M24*3.0P | ||
CAT50-ER50-8 | $89 | $0 | 12″ | 8″ | 3.875″ | 3.07″ | 1.969″ | 2.75″ | M24*3.0P |
Shanks: CAT40 and CAT50 to ANSI B5.50 (V flange) steep taper
ER collet sizes: ER16, ER20, ER25, ER32, ER40 and ER50
Gage lengths: 2.76", 3.15", 4", 6" and 8"
36 shank / collet / gage length configurations
Clamping accuracy (runout) ≤0.005mm (≤0.0002 in)
Dynamically balanced, for stable running at speed
Body material: 20CrMnTi alloy steel, vacuum quenched to HRC 56-58
Snap the collet into the nut first, then the tool, then lock into the body
Takes any standard ER collet — no proprietary tooling
Nut included; collets, wrench and pull stud ordered separately
The tool shank must reach past the collet bore’s effective clamping length
