Drill bit DeWalt DT9618-QZ, diameter 30 mm, length 250 mm, for rotary hammer

DeWalt DT9618-QZ is a single-piece SDS-plus rotary hammer drill bit with a 30 mm cutting diameter and a 250 mm overall length, designed for efficient drilling in masonry, concrete and similar mineral substrates. The bit is intended for use with compatible rotary hammers and provides a stable, large-diameter option for anchor holes, through-holes and other tasks requiring a wide bore. Construction of the bit focuses on rigid shank engagement and a cutting head geometry suited to rapid material removal in professional and DIY applications.

Advantages

The drill bit combines a wide 30 mm diameter with a 250 mm length to reach deeper or thicker sections while maintaining hole accuracy. Its single-piece design improves strength and reduces the risk of breakage under impact load compared with multi-part assemblies. The SDS-plus shank ensures secure, vibration-minimising coupling with compatible rotary hammers for consistent drilling performance. The cutting profile is optimised for masonry materials to provide effective dust and debris clearing during operation.

Suitable for

• Drilling large-diameter anchor and fixings holes in concrete and masonry
• Creating through-holes for pipes or conduits in walls
• Tasks requiring deeper boreholes in block, brick or reinforced concrete (with appropriate technique)
• Professional site work and advanced DIY projects using rotary hammers with SDS-plus connection

Key specifications

• Cutting diameter: 30 mm
• Overall length: 250 mm
• Shank type: SDS-plus compatible
• Construction: single-piece solid drill bit
• Intended materials: masonry, concrete, brick and other mineral substrates

How to use

Select a rotary hammer compatible with SDS-plus shanks and set it to hammer-drill mode appropriate for masonry. Mark and, if necessary, centre-punch the drilling location to improve starting accuracy. Insert the SDS-plus shank fully into the tool chuck until it locks. Apply steady axial pressure while allowing the hammering action to advance the bit; avoid excessive lateral force. Periodically withdraw the bit during long holes to clear dust and debris and to prevent overheating. Use appropriate personal protective equipment, including eye, ear and respiratory protection, and secure the workpiece or area before starting.

Usage recommendations

For best performance, match drill speed and hammer impact settings to the substrate hardness, use a dust extraction system where possible, and replace the bit when cutting edges show significant wear to maintain hole quality and tool safety.