Description:
Stationary 4-jaw steel chuck for centric workpiece holding on drilling and milling machines.

Material:
Steel.

Version:
- Contact faces on base ground.
- Jaw plates hardened and ground.

Function / Note:
- Flexible arrangement of hard and soft jaws permits different workpiece sizes and shapes to be held on the outside or inside faces.
- Take note of the jaw numbers when mounting.
- Chuck is precision ground; W, X, Y and Z tolerances between the jaws are within 0.05 mm.
- Repeat accuracy with centric clamping and hard jaws is within 0.02 mm.
- Movable jaw bases are driven by the internal scroll plate.
- Rotation of the pinion transfers force through the scroll plate and produces synchronous inward or outward jaw movement.
- Regular lubrication is required; inadequate lubrication causes excessive wear and reduced clamping force.

Advantages:
- Centric-clamping repeat accuracy: 0.02 mm.
- Flat design.
- For drilling and milling machines.
- Precision-ground body.
- Optimum accessibility to the lubrication system.
- Wide chuck bore for holding bar material.
- Actuated using a hex key for quick and easy operation.
- Soft jaws can also be attached to the jaw bases.

Supplied With:
Tightening key.

Accessories:
Soft steel jaw set: K1838.3104.

Drawing Reference:
- 1) Reversible jaw.
- 2) Standard jaws.
- 3) Fastening screws.

Dimensions / Variant Data:
- L: 250 mm
- L1: 18 mm
- L2: 218 mm
- B: 310 mm
- B1: 250 mm
- B2: 32 mm
- B3: 218 mm
- B4: 93 mm
- B5: 24.9 mm
- B6: 32.5 mm
- D: 200 mm
- D1: 70 mm
- G for socket head screw: M14
- H: 72 mm
- H1: 22 mm
- H2: 50 mm
- H3: 6 mm
- H4: 12 mm
- H5: 12 mm
- SW: 21 mm
- R: 104 mm
- Outer clamping range: 6-200 mm
- Inner clamping range: 72-200 mm
- Maximum tightening torque: 137 Nm
- Clamping force F: 22 kN