Drilling Accessories

Extensions, adaptors and anchors for diamond core drilling. Extensions let you drill deeper than the barrel alone allows; backend adaptors let you run bits across mismatched thread standards; anchors fix the stand to the substrate.

Taman stocks 1-1/4″ UNC and ½″ BSP extensions from 150mm to 500mm, backend adaptors including Hilti BI, M12 anchors and core handling accessories — all held in Belmont with same-day dispatch Australia-wide.

Thread standards — which fitting do you need?

Getting this wrong is the most common reason accessories come back. Core drilling uses several thread standards that look similar and aren’t interchangeable.

• 1-1/4″ UNC — the industry standard for wet core bits from roughly 50mm diameter up. If you’re running a rig-mounted motor on concrete, this is almost certainly your thread.
• ½″ BSP — common on smaller barrels and some dry bits. Note it’s a parallel pipe thread, not a machine thread — it will not mate with 1-1/4″ UNC under any circumstances.
• Hilti BI — Hilti’s proprietary interface. Requires an adaptor to run standard-thread bits, or to run Hilti bits on a standard motor.

Our backend adaptors bridge these: 1-1/4″ to ½″, ½″ BSP female to ½″ shank, and Hilti BI to ½″ female. If you’re unsure which combination you need, call us on (08) 9355 3588 with your motor model and bit thread and we’ll confirm before you order.

Using extensions properly

Every extension you add reduces rigidity and increases runout at the bit. Two practical rules:

Use the shortest extension that reaches. A 500mm extension on a 150mm hole gives you wander, chatter and shortened segment life for no benefit.

Grease the threads every time. Core drill threads seize under load and water, and a seized extension often has to be cut off. A smear of water-resistant grease or anti-seize on assembly costs nothing and saves the fitting. Always break the joint with spanner flats — never by reversing the motor.

Anchoring the stand

Anchor-base stands fix to the substrate with an M12 anchor set into a pre-drilled hole. The anchor must be set to the manufacturer’s embedment depth in sound concrete — an anchor in cracked, spalled or green concrete is not an anchor. Overhead drilling is anchor-only; vacuum bases are never acceptable above head height.

What else you’ll need

Core bits are in core drill bits. Motors and stands are in rig-mounted drills and drill stands. Wet drilling indoors also needs a wet vacuum for slurry control.