Concrete drill bit

Concrete drill bits serve construction work on various hard materials such as cast concrete, reinforced concrete, natural stone, solid brick and paving brick. This product range includes specialized lines from Diager with SDS Plus, SDS Max and cylindrical shanks, meeting needs from low-power cordless drills to professional rotary hammers.

Drill bit diameters range from Ø3mm to Ø45mm, lengths from 60mm to 1500mm, allowing users to select sizes appropriate to hole depth and the diameter of screws or anchors to be installed.

Lines such as Diager 108 integrate fixed depth stop collars, Diager 118 Rockfaster designed to penetrate rebar, Diager 166 Ultimax 646 for large holes in thick reinforced concrete, and Diager 226 Mega with high-strength cylindrical shank for standard drills. Solid carbide three-cutting-edge tips create precise round holes, reduce vibration and extend drill bit life.

Spiral flute systems evacuate dust quickly, limiting clogging during deep drilling. The 150° tip angle self-centers from the first strike, reducing slip on smooth surfaces. This product range supports both residential and industrial projects, from installing electrical and plumbing systems to anchoring steel structures to concrete walls.

Classification by shank type

Shank type determines compatibility with drill chucks and force transmission efficiency during drilling. SDS Plus shanks appear on small and medium diameter drill bits, suitable for common handheld rotary hammers. SDS Max shanks are for large diameter drill bits from Ø16mm upward, requiring high-power rotary hammers. Round cylindrical shanks are used with standard drills or cordless drills, commonly found on drill bits under Ø13mm diameter.

The Diager 108 line uses SDS Plus shanks, integrating fixed depth stop collars to control hole depth precisely. Codes such as 108D10L0033 Ø10mm diameter 110mm long, 108D15L0052 Ø15mm diameter 160mm long and 108D08L0027 Ø8mm diameter 110mm long all belong to this group. The Diager 226 Mega line uses high-strength cylindrical shanks, serving standard drills with codes 226D10 120mm long, 226D10L0200 200mm long and 226D11 Ø11mm diameter 150mm long.

The Diager 118 Rockfaster line with SDS Plus shank designed to penetrate rebar, including 118D07L0210 Ø7mm diameter 210mm long, 118D08L0160 Ø8mm diameter 160mm long and 118D08L0110 Ø8mm diameter 110mm long. The Diager 166 Ultimax 646 line uses SDS Max shanks for large diameters, for example 166D35L1300 Ø35mm diameter 1300mm long, 166D38L0690 Ø38mm diameter 690mm long and 166D40L0540 Ø40mm diameter 540mm long.

Classification by diameter and length

Drill bit diameter determines hole size, depending on the diameter of screws or anchors to be installed. Length determines the maximum depth that can be drilled through walls or concrete floors. Small diameter drill bits from Ø3mm to Ø8mm are typically used for small screws, electrical system installation or hanging light objects. Medium diameters from Ø10mm to Ø16mm serve expansion anchors, shelf installation or door frames. Large diameters from Ø18mm to Ø45mm are for chemical anchors, steel structures or drilling conduit holes.

The Diager 265 cylindrical shank line for cordless drills includes 265D03 Ø3mm diameter 60mm long, suitable for drilling small holes in paving brick or lightweight concrete. The Diager 226 Mega line provides 226D10L0400 Ø10mm diameter 400mm long for deep holes through thick walls. The Diager 118 Rockfaster line has 118D08L1000 Ø8mm diameter 1000mm long, serving drilling through thick reinforced concrete walls or multi-layer floors.

The Diager 166 Ultimax 646 line provides large diameters with multiple lengths: 166D42L1300 Ø42mm diameter 1300mm long, 166D45L1500 Ø45mm diameter 1500mm long and 166D45L0920 Ø45mm diameter 920mm long. Medium diameter codes such as 166D16L0920 Ø16mm diameter 920mm long, 166D18L0690 Ø18mm diameter 690mm long and 166D20L0920 Ø20mm diameter 920mm long also belong to this line.

Notable technical features

Solid carbide three-cutting-edge tips create precise round holes, reduce vibration and extend drill bit life. The 150° tip angle self-centers immediately upon surface contact, limiting slip on smooth materials such as glazed tile or polished stone. Spiral flutes evacuate dust quickly, reduce tip temperature and prevent clogging during deep drilling. Non-stick coating prevents concrete dust from adhering to the bit body, maintaining stable drilling speed.

The Diager 108 line integrates fixed depth stop collars, allowing hole depth control without repeated measurement. The Diager 118 Rockfaster line is designed to penetrate rebar, with high-impact carbide tips when encountering steel bars in reinforced concrete. The Diager 166 Ultimax 646 line uses special carbide for large diameters, withstanding high torque from SDS Max rotary hammers. The Diager 226 Mega line with high-strength cylindrical shank withstands clamping force from three-jaw chucks, preventing slip when drilling hard materials.

Codes such as 108D15L0054 Ø15mm diameter 160mm long with depth stop collar, suitable for uniform expansion anchor installation. Code 166D22L0340 Ø22mm diameter 340mm long and 166D22L0920 Ø22mm diameter 920mm long both belong to the Ultimax 646 line, penetrating thick rebar. Code 166D24L0920 Ø24mm diameter 920mm long serves drilling conduit holes for electrical or water pipes through reinforced concrete walls.

Applications by material type

Cast concrete requires drill bits with hard carbide tips and efficient dust evacuation flutes. Reinforced concrete needs drill bits designed to penetrate rebar, withstanding impact when encountering steel bars. Natural stone such as granite or marble demands self-centering tip angles and stable drilling speed. Solid brick or paving brick requires small diameter drill bits, avoiding edge cracking around holes.

The Diager 118 Rockfaster line serves drilling reinforced concrete, natural stone and solid brick, with codes such as 118D07L0210, 118D08L0160 and 118D08L0110. The Diager 166 Ultimax 646 line is for thick reinforced concrete, including 166D25L0340 Ø25mm diameter 340mm long, 166D25L0540 Ø25mm diameter 540mm long and 166D25L0690 Ø25mm diameter 690mm long.

The Diager 226 Mega line with cylindrical shank serves drilling concrete, natural stone and paving brick using standard drills, for example 226D10, 226D10L0200 and 226D11. The Diager 265 cylindrical shank line for cordless drills is suitable for drilling lightweight concrete, breeze block and plaster, with code 265D03 Ø3mm diameter 60mm long.

Selection and usage considerations

Check drill shank type before selecting drill bits to ensure compatibility. SDS Plus or SDS Max rotary hammers require corresponding shanks, standard drills use cylindrical shanks. Select drill bit diameter 1-2mm larger than screw or anchor diameter for easier installation. Select drill bit length at least 20-30mm longer than required hole depth to prevent tip contact with hole bottom when drilling through.

Use hammer mode when drilling concrete or stone, turn off hammer mode when drilling glazed tile to avoid cracking. Hold drill perpendicular to surface, avoid tilting causing misaligned holes or bit breakage. Withdraw drill bit from hole periodically to evacuate dust, especially during deep drilling. Do not apply excessive pressure, let drill weight and hammer action naturally perform the work. Clean spiral flutes after each use, store drill bits in dry locations to prevent rust.

The concrete drill bit product range provides diverse sizes and shank types, meeting needs from residential to industrial projects. Selecting the correct product line and size increases construction efficiency, reduces equipment wear and ensures hole quality.