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Item no.: 300646

HiRunER precision ER collet chuck SK 50 A = 70

Shape ADB
Concentricity ≤ 3
Machining strategy HSC
Arbor standard DIN 69871
Arbor standard ISO 7388-1
Balance quality G at rotational speed G 2.5 at 25,000 rpm<sup></sup>
Machining strategy HPC

HiRunER precision ER collet chuck SK 50 A = 70

Subsequent delivery
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External and internal tapers are ground. All shanks are hard turned for a smooth cutting action. Including Balluffchip bore, high-performance clamping nut up to 25000 rpm.


  • 3µm radial run-out with a 2µm collet, 6µm radial run-out with a 5µm collet.
  • Extremely strong holding force (up to factor 2 better than the standard ER chuck).
  • Vibration reduction effect due to 2-part clamping nut.


For clamping tools with plain shank in collets to DIN 6499 - Form A and B.

Supplied with:

Precision clamping nut.

Optional extras:

Pull studs (PS) No. 308600 – 308806, PS wrenches No. 308810 – 308830, ER collets No. 308901 – 309434, ER clamping wrenches No. 309680 – 309720.


Use the precision collet chuck always in conjunction with the precision clamping nut No. 309617.
  • Clamps only nominal ⌀ up to shank ⌀ tolerance h10.
  • Clamping nut not in conjunction with a sealing washer.