Choose by the hole you need to make
Select a diamond core drill bit first by the required finished hole diameter, then by the material and drilling equipment. Measure the pipe, conduit, anchor or penetration and allow for any specified clearance before ordering.
Match diameter and drilling depth
The NIU-MIX catalogue currently includes the DB300-127 Diamond Hole Saw: 5 in (127 mm) nominal diameter and 300 mm length. It is intended for applications where a 127 mm core and long reach are required. Confirm that this matches the finished opening rather than choosing by the outside diameter of a fitting alone.
Confirm machine connection
Before purchasing, check that your core drill motor accepts the listed 1-1/4 in connection. Also confirm the motor has sufficient capacity for the required diameter and that your drill stand or hand-held procedure is suitable for the work.
Match the bit to the material
The DB300-127 product specification lists asphalt, cured concrete, reinforced concrete and stone. Reinforcement, hard aggregate and stone can change drilling speed and tool life, so avoid forcing the core bit and follow the machine and site safety requirements.
Plan the drilling method
Confirm the approved dust, slurry and water-control method for the site before work starts. Use the drilling method and PPE specified by the equipment manufacturer and site rules, keep the work area secure, and check for services before coring.
Before you buy
Check the required finished hole diameter, drilling depth, material and possible reinforcement, motor and 1-1/4 in connection compatibility, access for the drill stand, and the site's service-location, dust and water-control requirements.
Product covered in this guide
DB300-127 - 5 in / 127 mm Diamond Hole Saw, 300 mm length, listed for asphalt, cured concrete, reinforced concrete and stone.