Think & Tinker, Ltd.
CNC router bits and carbide cutting tools with tutorials and technical guides

ER20 Collets

  • Architecture: interleaved spring collet
  • Steel : SCM440
  • Hardness: HRC 46
  • Taper: 8┬░
  • Surface Roughness: Rz 2.5
  • Internal hole by boring machine.
  • Collet Tolerance Grades:(read the Collet Selection tutorial)
    • EP (extreme-precision grade) TIR < 0.0001in (0.0025mm), TIR @ 1.0in. < 0.0002in.
    • UP (ultra-precision grade) TIR < 0.0002in (0.005mm)
    • PG (precision grade) TIR < 0.0004in (0.01mm)
    • SG (standard grade) TIR < 0.0006in (0.015mm)
  • Clamping range ER11= 0.020" (0.5mm), ER16, 20, 32, 40 = 0.039" (1mm )
  • Compatible with DR, RD, ESX, AR, & BR Series Collets
ER-25 Ultra-precision collet

Collet Grade

1/8 in. (0.1250") clamping ER-20 ultra-precision (UP) collet..

$29.95

3/16 in. (0.1875") clamping ER-20 ultra-precision (UP) collet..

$29.95

1/4 in. (0.2500") clamping ER-20 ultra-precision (UP) collet..

$29.95

3/8 in. (0.3750") clamping ER-20 ultra-precision (UP) collet..

$29.95

1/2 in. (0.5000") clamping ER-20 ultra-precision (UP) collet..

$29.95

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