Keyed chuck Bosch 2 609 255 708 Minimum capacity 1.5 mm Maximum capacity 1.3 cm

The Bosch keyed chuck with capacities from 1.5 mm to 13 mm is a metal drill chuck designed to provide a secure, repeatable grip on round and hexagonal drill bits. Intended as a replacement or upgrade for compatible drills, the chuck uses a geared key mechanism to tighten and loosen the jaws, allowing precise centring and firm clamping for drilling tasks that require accuracy and reliable bit retention.

Advantages

This chuck delivers consistent clamping force through a keyed mechanism, reducing slippage during high-torque or hammering operations. Its metal construction offers wear resistance and dimensional stability under repeated tightening. The broad capacity range covers small-diameter pilot bits up to common 13 mm bits, making it suitable for a variety of workshop and site applications. The keyed system enables fine control when securing bits, which helps maintain concentricity and improves drilling accuracy.

Suitable for

• Precision drilling in metal, wood and plastics with small to medium diameter bits
• Workshop and on-site tasks where a secure, vibration-resistant grip is needed
• Replacement of worn or damaged chucks on compatible handheld drills and drill drivers

When it may not be suitable

This keyed chuck may be less convenient for users who frequently change bits and prefer keyless chucks for faster, tool-free swapping. It is not designed for very large-diameter drill bits beyond the stated maximum capacity or for specialized SDS-shank tools that require dedicated holders. Compatibility depends on the drill spindle type and mounting interface, so incorrect fitment can prevent proper installation.

Key specifications

• Minimum clamping capacity: 1.5 mm
• Maximum clamping capacity: 13 mm
• Actuation type: keyed (chuck key required for tightening/loosening)
• Material: metal construction for jaws and housing
• Suitable bit types: round shank and hex shank drill bits within capacity range

How to use

Open the jaws with the chuck key until there is enough clearance to insert the drill bit. Position the bit centrally between the jaws, then use the key in the geared socket to tighten the chuck firmly while ensuring the bit remains straight. After tightening, test by running the drill at low speed to confirm concentricity and secure retention. To remove the bit, loosen the jaws with the chuck key until the bit can be withdrawn. Follow the drill manufacturer's guidance for recommended maximum speeds and clamping force for specific materials and bit types.

What to consider before purchase

• Verify the mounting interface of your drill to ensure mechanical compatibility with the chuck
• Confirm the 1.5 mm–13 mm capacity range matches the diameters of bits you use most often
• Decide between keyed and keyless operation based on how frequently you change drill bits

Usage recommendations

Use an appropriately sized chuck key and tighten incrementally, checking bit alignment before full-speed operation. For prolonged drilling or higher-torque applications, periodically recheck the chuck tightness to prevent slippage. Store the chuck and key in a dry place and remove debris from the jaws to maintain reliable clamping performance.