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ROTARY DRILLING TOOLS

Roller bits for
your core barrel.

Weld-on and replaceable roller bits for core barrels. Find your model, match an existing mounting or discuss a new cutting arrangement.

Help me chooseI know my model

Weld-on and removable assemblies · 132, 139 and 191 mm catalogue cone sizes

DRILLNOVA MH-3 roller bit render showing the complete cone and leg.

START WITH YOUR REQUIREMENT

What do you need?

REPLACEMENT CUTTERS

Replace roller bits

Match an individual bit or a replacement set to the mounting on your existing barrel.

Check my mounting

NEW TOOL OR REBUILD

Configure a core barrel

Choose the complete tool or lower assembly, with its diameter and cutting arrangement.

Explore roller-bit core barrels

MODEL UNKNOWN

Identify what I have

A photo of the bit and its connection is a useful starting point. No model number needed.

See what to send

01 / MOUNTING ARRANGEMENT

How does the bit attach?

DRILLNOVA MH-3 roller bit render showing the complete cone and leg.

Weld-on

Leg welded to the cutting ring.

Check the fit
Leg profile, position and working height.

MH-1MH-2MH-3MH-3H

View weld-on models
DRILLNOVA MH-3B roller bit render with its mounting plate, bolts and nuts.

Removable

Cutter retained by a holder or bolted assembly.

Check the fit
Holder or bolts, fixing arrangement and clearances.

MH-3BMH-3CMH-3R*

View removable models

Similar cone sizes do not confirm an interchangeable mounting. *MH-3R needs an application review for rotary piling.

Compare mounting options Replacing individual roller bits: see the inspection
Bolted mounting detail
Illustration · detail2.5 sec

Inspect the bolted mounting detail.

A brief close-up shows mounting bolts beside a roller-bit assembly. Use it to identify the type of fixing, then compare the interface with your existing tool.

Review your mounting arrangementCompare mounting options
Read the video description

The animated close-up follows the mounting bolts beside the cutting assembly.

Check the holder, fasteners and mating dimensions against the drawing for your assembly.

SELECT BY MOUNTING

Shortlist your roller bits.

Filter by mounting. The size shown is the catalogue cone size; confirm the complete mounting dimensions before ordering.

ROLLER BITS

Find your model.

Explore the MH series by mounting arrangement.

7 models

DRILLNOVA MH-1 roller bit render showing the complete cone and leg.

MH-1

Weld-on

132 mm45 insertsØ13 mm

Flat weld-on leg; confirm the selected drawing revision.

Check before ordering: Match the flat leg profile, mounting position and selected drawing revision.

View model & fit Request model
DRILLNOVA MH-2 roller bit render showing the complete cone and curved leg.

MH-2

Weld-on

139 mm52 insertsØ14 mm

Third-generation cone; traditional irregular weld-on leg.

Check before ordering: Match the irregular weld-on leg contour and installation position to your drawing.

View model & fit Request model
DRILLNOVA MH-3 roller bit render showing the complete cone and leg.

MH-3

Weld-on

139 mm52 insertsØ14 mm

Thicker fourth-generation leg with a preset welding angle.

Check before ordering: Check the thicker leg and preset angle against your barrel layout and drawing.

MH-3 construction & specifications

View model & fit Request model
DRILLNOVA MH-3B roller bit render with its mounting plate, bolts and nuts.

MH-3B

Bolt-mounted

139 mm52 insertsØ14 mm

Crossbar mounting with two bolts and locknuts.

Check before ordering: Check your existing crossbar, bolt arrangement and available clearance.

View model & fit Request model
DRILLNOVA MH-3C roller bit render with the complete dark mounting holder.

MH-3C

Holder-mounted

139 mm52 insertsØ14 mm

Separate holder for a removable cutter arrangement.

Check before ordering: Match the holder interface and retaining arrangement before selecting a replacement.

View model & fit Request model
DRILLNOVA MH-3H roller bit render showing the complete cone and leg.

MH-3H

Weld-on

191 mm17 mm inserts

Larger fourth-generation weld-on assembly.

Check before ordering: Check the larger weld-on assembly, installation position and selected drawing.

View model & fit Request model
DRILLNOVA MH-3R roller bit render with the complete dark holder and visible fasteners.

MH-3R

Holder-mounted

139 mm52 insertsØ14 mm

Distinct face-fastener holder; application-specific review.

Check before ordering: Review the intended application, holder interface and face-fastener arrangement.

View model & fit Request model

3D product renderings. Confirm the mounting drawing before ordering.

Mounting arrangements are not universally interchangeable. Check the holder or bolt interface for your tool.

Model & fit

Request model

Check the installation

    Supply scope

    Open model link (opens in a new tab)

    3D product rendering. Confirm the mounting drawing before ordering.

    Open original PNG (opens in a new tab)
    Compare all seven specifications
    MH-series configuration comparison
    ModelCatalogue cone sizeInsert arrangementLeg / installation distinctionListed cone / leg material
    MH-1132 mm45 inserts · Ø13 mmFlat weld-on leg; selected drawing revision applies20CrNiMo / 20CrNiMo
    MH-2139 mm52 inserts · Ø14 mmThird-generation cone; traditional irregular weld-on leg20CrNiMo / 20CrNiMo
    MH-3139 mm52 inserts · Ø14 mmThicker fourth-generation leg with preset welding angleConfirm cone and leg grades against the selected drawing
    MH-3C139 mm52 inserts · Ø14 mmSeparate holder; removable cutter arrangementConfirm cone and leg grades against the selected drawing
    MH-3B139 mm52 inserts · Ø14 mmCrossbar, two bolts and locknutsConfirm cone and leg grades against the selected drawing
    MH-3R139 mm52 inserts · Ø14 mmDistinct holder and face-fastener arrangement²Confirm cone and leg grades against the selected drawing
    MH-3H191 mm17 mm insertsLarger fourth-generation weld-on assembly20CrNiMo / 20CrNiMo

    Nominal catalogue data. Final dimensions, material and mounting are defined by the selected order drawing. The complete MH-3H configuration is confirmed on its selected drawing. ²The MH-3R leaflet describes HDD/microtunnelling use; assess the specific tool before a piling application.

    Weld-on or replaceable: what changes?How the cutting envelope is established

    02 / FIT & SUPPLY SCOPE

    Confirm the connection
    before choosing the part.

    Use the model to start the comparison. The existing tool and selected drawing define the fit.

    Help identify my roller bit

    Have these ready

    1. The part and mountingModel if known, a whole-tool photo and a close-up of the leg, holder or bolts.
    2. The dimensionsBarrel diameter, cone size and mounting measurements or a drawing.
    3. What you want suppliedIndividual cutters, a set, or cutters with holders and fixing parts; quantity and destination.

    For a new layout or a drilling problem, add the rig, formation and wear photos. Send the information you have; missing details can be discussed.

    On-site support, followed into service.

    MH-3 refit work on the customer’s existing barrel at the Zengcheng site
    26 June 2022 · on-site positioning and welding. View full image

    1,200 mm MH-3 refit · site support

    Approximately 57 m of cumulative drilling recorded. We helped refit the customer’s existing barrel, guided positioning and welding, and trained the operators.

    See the refit and follow-up record →
    The 800 mm high-spiral roller-bit core barrel during the Jieyang field trial
    Jieyang · the high-spiral barrel during its site trial. View full image

    800 mm high-spiral barrel · site trial

    Good cuttings discharge was reported. A new design addressed the customer’s packed cuttings and heavy wear; the trial followed operating adjustments, recovered rock and cutter inspections.

    Follow the design through its field trial →

    Zengcheng’s running total includes estimated entries and an incomplete replacement history; it is not verified life for an unchanged ten-bit set. The Jieyang observations do not establish a service-life increase.

    Missing cone, stiff cone or insert damage?Inspect packed cuttings on an 800 mm barrel

    See how the roller bit is made

    Follow journal machining, hardfacing and assembly inspection in a roller-bit manufacturing record.

    Roller-bit manufacturing & inspectionJournal, cone and assembled-fit checks

    USE & APPLICATION

    Installation and operating support.

    03 / YOUR ENQUIRY

    Request roller bits for your tool.

    For a replacement, include the model or photos, mounting arrangement, quantity and destination. Tell us whether holders and fixing parts are also needed.

    Request replacement roller bitsI need help identifying the part

    Photos and drawings can be sent by email or WhatsApp from the enquiry page.