Article no.: 302818

ER collet chuck Form ADB BT 50 short

Arbor standard JIS B6339
Concentricity ≤ 3
Arbor standard ISO 7388-2
Balance quality G at rotational speed G 6.3 at 20,000 rpm
Shape ADB
Machining strategy HSC

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External and internal taper ground.
  • All shanks hard turned (for smooth running!). Balancing quality G2.5/25,000 rpm.
  • Clamping nut balanced for HSM (G2.5/25,000 rpm).
  • Optimum wear characteristics and torque transmission due to the coated precision clamping nut.


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

Supplied with:

ER clamping nut.

Optional extras:

ER collets No. 308881 − 309434, ER chuck keys No. 309680 – 309745 or No. 613300.
Pull studs (PS) No. 308760 − 308806. Pull stud wrenches No. 308820; 308835.


Matching clamping nut No. 309580 or 309610.

Technical Data

BT 50 short
Arbor standard
JIS B6339; ISO 7388-2
Balance quality G at rotational speed
G 6.3 at 20,000 rpm
≤ 3 µm
Machining strategy
Type of product
Collet chuck

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