Which power tools are compatible with this hammer drill bit?

This bit fits all rotary hammers with an SDS-max chuck system. It is not compatible with standard SDS-plus tools.

Which materials can you drill with this bit?

It is suitable for drilling in (reinforced) concrete, masonry, brick, natural stone, and artificial stone.

What are the exact dimensions of this drill bit?

It has a 42 mm diameter, a working drilling length of 450 mm, and an overall length of 570 mm.

What is the benefit of the 4-cutter carbide head?

The 4 cutting edges distribute impact force evenly, reduce vibration, and prevent jamming when encountering rebar.

How does the flute design help during drilling?

The 4-flute helix efficiently removes dust and debris from the hole, ensuring sustained drilling speed and reduced wear.

DEWALT DT9447-QZ SDS-Max drill bit EXTREME HM 42x450x570mm

Name: DEWALT DT9447-QZ SDS-Max drill bit EXTREME HM 42x450x570mm
Brand: DEWALT
SKU: 08071183
Price: 112.6 EUR
Availability: PreOrder

Supplier number: DEWALT DT9447-QZ | EAN 5035048060148

Recommended Retail Price €258.21

112.60 tax incl.

€93.06 excl. VAT (incl. all environmental contributions)

On order: delivered from 28/10/2026

Ordered before 20:00 - delivered as of 28/10/2026
Shipping costs €6.99 VAT included | Free shipping for orders over a total amount of 125 euros
Delivery by DHL

✆ Talk to a specialist

What does this mean exactly?

Free battery, delivered directly: spend a total of €350 excl. VAT on DeWALT products and receive a free XR 18V 5.0Ah battery worth €128.38. This is an exclusive Klium promotion: the battery is automatically added to your shopping cart and delivered together with your order.
Free work light, delivered after registration: if you also purchase a participating product from the DeWALT work light promotion, you will receive a free DeWALT work light, depending on the participating machine.
To receive your free work light, register your purchase after receiving your order via dewalt.be or dewalt.nl.
Klium free battery promotion: valid from 01.10.2026 to 31.12.2026.
DeWALT work light promotion: valid from 01.09.2026 to 31.12.2026.

During DeWALT Power Month, you can combine a free battery from Klium with a free work light from DeWALT.

Heavy drilling with Dewalt

Practical benefits

Fast penetration through masonry: The solid 4-cutter carbide head cuts smoothly through concrete, stone, and brick to deliver clean results.
Rapid dust and debris removal: The four-flute helix clears dust quickly from deep holes, ensuring you maintain optimal drilling speed without clogging.
Reliable SDS-Max power transmission: The reinforced steel body and optimized shank provide dependable strength and reduce breakage during demanding hammer drilling.

In a nutshell

The right choise for

With the Dewalt DT9447-QZ SDS-Max Extreme hm hammer drill bit, you drill powerful, clean large-diameter holes through reinforced concrete, masonry, and natural stone. The robust 4-CUT solid carbide head with four cutting edges evenly distributes impact energy and prevents jamming when striking rebar. Featuring a 42 mm diameter, a 450 mm working length, and a 570 mm total length, it easily handles deep wall and floor penetrations for pipes and cables. The four-flute helix clears drilling dust quickly to maintain high drilling speed, while the reinforced steel body and SDS-Max shank ensure direct power transmission and minimal breakage risk.

Product information FAQ

€112.60

tax incl.

Key features according to our expert

Diameter: 42 mm
Drill bit type: Hammer drill bit
Overall length: 570 mm
Shank type: SDS-max
Material (drill bit): Carbide tip
Number of cutting edges: 4
Cutting length: 450 mm
Product Range: Dewalt EXTREME

Product description

SDS-Max drill bit EXTREME HM 42x450x570mm

Features

Suitable for fast drilling of plug, anchor or through holes in masonry, stone, concrete and brickwork
Optimised mounting shank ensures perfect grip and optimum power transmission, with hardened steel housing for extra strength and reduced breakage
Sturdy cutting head is flanked by two separate cutting tips that deliver fast and efficient drilling speed

All Features

Diameter: 42 mm
Drill bit type: Hammer drill bit
Overall length: 570 mm
Shank type: SDS-max
Material (drill bit): Carbide tip
Number of cutting edges: 4
Cutting length: 450 mm
Thickness: Impact Bits
Weight: NO
Applications: Concrete
Length: 570,0 mm
Material: Carbide Grit
Diameter: 42,0 mm
Product type: 1,0
Max. cutting capacity at 45° [square profile]: SDS Max Fitment
Performance: Extreme
Working length: 450,0 mm
Product range: Dewalt EXTREME

Brand DEWALT
08071183
EAN 5035048060148
Supplier number DEWALT DT9447-QZ

Frequently asked questions about this product

Answered by specialists

Which power tools are compatible with this hammer drill bit?: This bit fits all rotary hammers with an SDS-max chuck system. It is not compatible with standard SDS-plus tools.
Which materials can you drill with this bit?: It is suitable for drilling in (reinforced) concrete, masonry, brick, natural stone, and artificial stone.
What are the exact dimensions of this drill bit?: It has a 42 mm diameter, a working drilling length of 450 mm, and an overall length of 570 mm.
What is the benefit of the 4-cutter carbide head?: The 4 cutting edges distribute impact force evenly, reduce vibration, and prevent jamming when encountering rebar.
How does the flute design help during drilling?: The 4-flute helix efficiently removes dust and debris from the hole, ensuring sustained drilling speed and reduced wear.