Diamond Core Bit Extension Rods – 5/8″-11 & 1-1/4″-7 UNC

Diamond core bit extension rods connect between
compatible drilling machines and core bits to
provide additional working reach for deeper
drilling applications.

The ALSKAR standard extension series focuses on
5/8″-11 and 1-1/4″-7 UNC female-to-male connections.
Contact us for specific lengths, configurations,
and product availability.

No. These are different thread sizes. The
extension must match the machine spindle and
the diamond core bit hub. A separate approved
conversion adapter may be required.

Select the extension length based on the required
working reach, core bit length, available clearance,
and machine capacity. Longer assemblies may require
additional support and more careful alignment.

Some extension systems allow compatible rods to
be connected together. However, stacking extensions
increases total assembly length and may increase
bending and alignment risks. Only use multiple
extensions when permitted by the equipment
manufacturer.

Wet drilling compatibility depends on the
extension’s internal water passage, connection
design, and drilling equipment. Confirm that
the complete system supports the intended
water supply arrangement before use.

No. Extension rods increase working reach,
not the drilling machine’s rated capacity.
Always follow the equipment manufacturer’s
maximum core diameter, torque, and operating
requirements.

Contact ALSKAR DIAMOND with your required
thread connection, extension length, quantity,
and application details. Our team can review
product availability and custom requirements.