Hilti DD-BI Core Bit Extension

The Hilti DD-BI Core Bit Extension is designed to increase the drilling depth of compatible Hilti diamond core drilling systems while maintaining secure, reliable power transfer. Precision-machined for use with BI connection core bits, this extension provides dependable performance for deep concrete coring applications.

Featuring a 12-inch working length and robust steel construction, the DD-BI extension is engineered for professional contractors requiring additional reach without sacrificing drilling accuracy.

Key Features

• Hilti DD-BI core bit extension
• Hilti Part Number: 220929
• 12 in. working length
• 55 mm outside diameter
• BI connection for compatible Hilti core bits
• Heavy-duty steel construction
• Secure locking connection for efficient torque transfer
• Designed for professional diamond coring applications

Compatible Equipment

The DD-BI Core Bit Extension is designed for use with the following Hilti diamond core drilling system:

• Hilti DD 150-U Diamond Coring System

Construction Details

Manufactured from durable, precision-machined steel to withstand the high torque and demanding conditions encountered during diamond core drilling.

The BI connection system provides quick installation while maintaining secure engagement between the drill motor and core bit.

Designed to extend drilling depth without compromising alignment or drilling performance.

Important Notes

Compatible only with Hilti BI connection diamond core bits and supported drilling systems.

Always verify compatibility with your specific drill motor and coring accessories before use.

Follow Hilti operating instructions and safety guidelines when installing extension accessories.

Compatible Equipment