Diamond core bit Ø42 mm x 420 mm REMS 181015 R, UDKB

The diamond core bit 42mm REMS 181015 R UDKB cuts through concrete, reinforced concrete, masonry, natural stone, asphalt and screed. It reaches a drilling depth of 420 mm. The bit carries four high-concentration diamond segments brazed by automated induction soldering. A UNC 1 1/4 female thread fits REMS Picus S1, SR, S3 and S2/3.5 machines. The thread self-tightens during rotation, maintaining a secure connection under load.

Diamond core bit 42mm construction and segment design

Induction-brazed diamond segments

Four segments sit on the cutting edge. Each segment contains high-concentration diamond grit. Automated induction brazing creates uniform tin bonds between segment and tube. The beveled roof profile reduces vibration and accelerates penetration. When segments wear down, the steel tube accepts new segments through re-brazing, extending service life without replacing the entire bit.

• Four high-concentration diamond segments
• Automated induction tin brazing
• Beveled roof profile for smooth cutting
• Steel tube body accepts re-brazed segments
• Uniform bond strength across all segments

The beveled segment geometry guides the bit into hard materials with less chatter. Uniform brazing distributes heat evenly during drilling. Re-brazing capability lowers operating cost on job sites with continuous core-drilling schedules.

UNC 1 1/4 female thread connection

The bit features a UNC 1 1/4 female thread machined into the rear end. This thread mates with male spindles on REMS Picus models and other compatible core-drilling machines. The thread self-tightens as the bit rotates, preventing loosening under torque. The connection transmits full motor power to the cutting edge without slip.

• UNC 1 1/4 female thread
• Self-tightening during rotation
• Compatible with REMS Picus S1, SR, S3, S2/3.5
• Fits other machines with matching male thread

The self-tightening action eliminates the need for thread-locking compounds. Operators can hand-start the bit and rely on rotation to secure it. The thread standard ensures interchangeability across REMS and third-party equipment.

Drilling modes and material compatibility

Wet and dry drilling capability

The bit operates in both wet and dry modes. Wet drilling uses water to cool the segments and flush cuttings from the hole. Dry drilling suits sites without water supply or where slurry management is impractical. Segment design tolerates the higher temperatures of dry drilling without premature wear. Operators select the mode based on site conditions and dust-control requirements.

• Wet drilling with water cooling and flushing
• Dry drilling without water supply
• Segments tolerate dry-mode heat
• Hand-held or rig-mounted operation

Wet mode extends segment life and reduces airborne dust. Dry mode offers faster setup and avoids slurry disposal. The bit performs reliably in either mode when paired with appropriate machine power and feed pressure.

Material range

The bit cuts concrete, reinforced concrete with rebar, all types of masonry, natural stone, asphalt and screed. Diamond segments bite into aggregate and steel reinforcement without stalling. The 42 mm diameter suits conduit holes for water pipes, electrical cables and ventilation ducts. The bit also extracts core samples for concrete quality testing and drills anchor holes in structural steel and concrete assemblies.

Common applications

Installers use the 42 mm bit to drill conduit holes in walls and floors for plumbing, electrical and HVAC systems. Quality-control teams extract core samples to verify concrete strength and aggregate distribution. Structural engineers drill anchor holes for post-installed fixings in concrete and masonry. The 420 mm depth accommodates thick walls and multi-layer assemblies. The bit works hand-held for vertical and horizontal holes or rig-mounted for precise alignment and controlled feed. Compatibility with REMS Picus machines simplifies tool management on job sites already equipped with that platform.

Technical data and compatibility

The bit measures 42 mm in diameter and drills to 420 mm depth. The UNC 1 1/4 female thread connects to REMS Picus S1, SR, S3 and S2/3.5 machines. Four diamond segments are induction-brazed with tin. The steel tube body accepts re-brazed segments when the original segments wear out. The bit ships in a cardboard carton. Operators should match bit diameter and depth to the hole specification and select wet or dry mode according to site conditions and machine capability.