Diamond wet core drill bit Montolit FAJ08 — 8 mm diameter for wet drilling

Montolit FAJ08 is an 8 mm diameter diamond wet core drill bit designed for precise, small-diameter hole cutting in hard surfaces. The bit features a diamond-coated cutting edge optimized for wet drilling, which reduces heat and extends tool life while maintaining accurate hole geometry. It is intended for use with water cooling systems and standard core drill holders compatible with an 8 mm diameter tool.

Advantages

The diamond coating provides high wear resistance and consistent cutting performance on materials such as ceramic, porcelain, glazed tiles and natural stone. Wet operation improves cooling and dust suppression, resulting in cleaner cuts and reduced risk of material cracking. The compact 8 mm diameter allows for precise openings for fittings, anchors or pilot holes without unnecessary material removal.

Suitable for

• Precision holes in ceramic and porcelain tiles
• Small core drilling in natural stone and marble
• Creating openings for plumbing or electrical fittings in tiled surfaces
• Pilot or guide holes before using larger-diameter core bits

Key specifications

• Cutting diameter: 8 mm
• Cutting edge: diamond-coated
• Intended cooling method: wet drilling (water-cooled)
• Typical applications: tiles, ceramics, stone
• Suitable for handheld and bench-mounted rotary drilling setups that accept small-diameter core bits

How to use

Mount the 8 mm diamond core bit into a compatible drill chuck or core bit holder, ensuring a secure fit. Start drilling at low speed with constant water flow to the cutting area to keep the bit cooled and to remove slurry. Apply steady, moderate pressure and avoid forcing the bit; allow the diamond abrasives to wear the material gradually. Periodically lift the bit to refresh cooling water and clear debris for consistent cutting.

Usage recommendations

Use continuous water cooling and a low to medium drill speed for best results. For brittle or glazed surfaces, begin drilling at an angle to establish a guide groove before moving to a perpendicular position. Inspect the bit for wear before each job and replace it if the diamond segment shows significant loss of cutting performance.