Economy Core Drills


Core Drills - Economy

Asahi Diamond manufacture and stock a wide range of Thin Wall Bit Core Drills (TWB’s).

Commonly used in the building industry for the installation of utilities, our economy range of TWB's can drill a variety of materials including heavily reinforced concrete, asphalt and sandstone.

All of our Core Drills can be manufactured to meet any specific need and can also be refurbished / re-tipped to reduce costs at our Sydney Facility. Click here for more information.

Outside Diameter




51mm  (2") 450mm Segment 1 1/4" UNC
64mm  (2.5") 450mm Segment 1 1/4" UNC
76mm  (3") 450mm Segment 1 1/4" UNC
90mm  (3.5") 450mm Segment 1 1/4" UNC
103mm  (4") 450mm Segment 1 1/4" UNC
115mm  (4.5") 450mm Segment 1 1/4" UNC
127mm  (5") 450mm Segment 1 1/4" UNC

Light Duty Water Swivels

Asahi Water Swivels allow for faster drilling speeds and feed rates and also provides a longer tool life.


Input Size Output Size
Thin Wall Bit Water Swivel - standard 1/2" chuck 13mm / 1/2" 1 1/4" UNC

Core Drill Machine and Stand

The Asahi Core Drill Machine is a fully ball bearing, powerful two speed core drill motor with an optional adjustable drill stand.

The machine comes fitted with a water attachment, a safety clutch and spirit level and one carbon brush with an adjustable front and back handle.  The power cord is fitted with RCD protection.

It is extremely versatile and ideal for drilling a variety of materials up to a maximum of 80mm diameter in walls, floors and roofs.



Input Power

Drilling Capacity


240v 2100/950 1500w 80mm dia 1 1/4" UNC / 1/2"


Asahi Economy TWB's are available in sizes 2" - 12".
Only TWB's up to 5" can currently be purchased online.
For bigger TWB's contact us on: 02 9997 7033 /