Concrete Drill Bit Makita SDS‑MAX 20 mm MA‑D‑33984

Makita SDS‑MAX 20 mm concrete drill bit MA‑D‑33984 is a purpose-built masonry bit for rotary hammers with SDS‑MAX chucks. The 20 mm diameter carbide-tipped bit is made for impact drilling into concrete, reinforced concrete and masonry. Its robust shaft and tip geometry deliver reliable penetration and stable drilling performance when creating holes for anchors, dowels and cable passages during construction and renovation work.

Advantages

The SDS‑MAX shank provides secure engagement with compatible rotary hammers, reducing slippage and improving energy transfer on impact. Hardened carbide cutting edges maintain sharpness and extend service life under heavy use. The solid construction resists bending and breakage during high-impact drilling and helps maintain consistent hole size and alignment. The bit’s 20 mm diameter is a common size for anchor and dowel installation, offering versatility on job sites.

Suitable for

• Drilling holes in concrete and reinforced concrete
• Installing anchors, dowels and fasteners
• Creating cable and conduit passages through masonry
• General demolition and renovation tasks requiring impact drilling

Key specifications

• Shank type: SDS‑MAX compatible
• Diameter: 20 mm
• Tip material: carbide cutting edges
• Intended use: impact drilling in concrete, masonry and similar materials
• Construction: solid, hardened shaft designed for rotary hammer operation

How to use

Install the drill bit into the SDS‑MAX chuck of a compatible rotary hammer until it locks. Select the hammer drilling mode and set appropriate rotation speed and impact force according to the rotary hammer manufacturer’s recommendations for a 20 mm masonry bit. Start drilling with light pressure to establish the hole, then apply steady pressure while allowing the tool’s impact action to do the work. Withdraw the bit periodically to clear dust from the hole and prevent clogging. Use suitable cooling and dust extraction methods where applicable.

Usage recommendations

Use personal protective equipment including eye protection, hearing protection and a dust mask when drilling. For reinforced concrete, use controlled feed rates to avoid excessive bit wear. For extended service life, keep the bit clean and remove accumulated dust; sharpen or replace the bit when cutting performance declines.