Drill bit SDS-Max 30 x 400 x 520 mm MAX-4, Bosch

SDS-Max drill bit 30 x 400 x 520 mm MAX-4 from Bosch is designed for heavy-duty drilling and chiseling in concrete and masonry when used with SDS-Max rotary hammers. The bit features a four-flute geometry that improves dust evacuation and maintains drilling stability at large diameters. The dimensions signify a 30 mm cutting diameter, 400 mm working length and 520 mm total length, making it suitable for through-drilling and deeper anchor or rebar clearance tasks.

Advantages

The four-flute design enhances dust removal from the hole and reduces friction during rotation, helping to maintain cutting efficiency and consistent alignment. Reinforced head geometry and robust steel construction increase resistance to wear during repeated impact drilling in concrete and masonry. The extended working length allows deeper penetration while the overall length provides enough shank engagement in the tool for secure connection and improved power transfer.

Suitable for

• Drilling through concrete for anchor installation
• Chiseling-start holes and clearance drilling in reinforced concrete
• Drilling masonry walls and blocks for mechanical fixings
• Applications requiring deep or through-holes where long working length is needed

Key specifications

• Cutting diameter: 30 mm
• Working length: 400 mm
• Total length: 520 mm
• Shank type: SDS-Max compatible
• Flute design: four-flute for improved dust evacuation
• Material: high-strength steel with reinforced tip geometry
• Intended material: concrete and masonry

How to use

Insert the SDS-Max shank fully into the rotary hammer chuck until it locks. Select hammer-drilling mode and position the bit perpendicular to the work surface for initial penetration. Apply steady axial pressure and allow the rotary hammer to perform the impact action; avoid excessive side load to reduce bit wear. For through-drilling, periodically withdraw the bit to clear accumulated dust if progress slows, or use continuous drilling at moderate feed to maintain dust evacuation through the flutes.

Usage recommendations

Use appropriate personal protective equipment including eye protection, hearing protection and dust mask. Match rotary hammer power and impact energy to the bit size and the hardness of the substrate. For reinforced concrete, use controlled feed and coolant is not required; regularly inspect the bit for tip wear and replace when cutting performance declines.