ER Spring Collets - ER Nuts - ER ISO 20 Toolholders - Porter Cable - Bosch Colt

Steel - SUJ 2
H.R.C. 46
Taper - 8°
Surface Roughness Rz 2.5
Internal hole by boring machine
Clamping capacity:
    -ER8, ER11 - 0.5 mm (.020")
    -ER16, 20, 32, 40 - 1.0 mm (.039")

Used in applications where speeds exceed 10,000 PRM

Balanced to G2.5 for 20,000 RPM

Used on collet holders and multi-spindle heads where center or shoulder distances are critical

Balanced to 18,000 RPM @ G2.5 (Inspection Report included for accuracy and balance)
Internal (collet) Taper: 8°
Surface Roughness Rz 2.5
Degree of concentricity exceeds the DIN standard. 100% examined to 0.005 mm TIR

Steel - SUJ 2
H.R.C. 45-52
Surface Roughness - Ra 0.5 um
Internal hole by boring machine
SG (standard grade) TIR < 0.015 mm
PG (precision grade) TIR < 0.01 mm
UP (ultra-precision grade) TIR < 0.005 mm
Degree of concentricity exceeds the DIN standard. 100% examined

Used in applications where speeds exceed 10,000 PRM
H.R.C. 45-52
Balanced to 24,000 RPM @ G2.5
TIR (with PC collet) < 0.005 mm

Steel - SUJ 2
H.R.C. 45-52
Surface Roughness - Ra 0.5 um
Internal hole by boring machine
SG (standard grade) TIR < 0.015 mm
PG (precision grade) TIR < 0.01 mm
UP (ultra-precision grade) TIR < 0.005 mm
Degree of concentricity exceeds the DIN standard. 100% examined

Used in applications where speeds exceed 10,000 PRM
H.R.C. 45-52
Balanced to 24,000 RPM @ G2.5
TIR (with PC collet) < 0.005 mm

Steel - SUJ 2
H.R.C. 45-52
Surface Roughness - Ra 0.5 um
Internal hole by boring machine
SG (standard grade) TIR < 0.015 mm
PG (precision grade) TIR < 0.01 mm
Degree of concentricity exceeds the DIN standard. 100% examined

Used in applications where speeds exceed 10,000 PRM
H.R.C. 45-52
Balanced to 24,000 RPM @ G2.5
TIR (with PC collet) < 0.005 mm