Milled Tooth
Soft formation
Rock strength5–35 MPa
1/5
Engineered for HDD and microtunneling reaming applications, the DRILLNOVA Replaceable Roller Bit combines a project-matched insert layout with a secure three-bolt mounting system. The complete cutter module can be removed and replaced without welding, helping crews reduce workshop work and restore the cutting structure efficiently.
The DRILLNOVA Replaceable Roller Bit is a modular cutter assembly developed for rock reamers used in horizontal directional drilling and microtunneling. Instead of welding each cutter assembly directly to the reamer body, the holder fits into a machined slot pocket and is retained by three bolts with spring-lock components. A worn or application-mismatched cutter can therefore be exchanged without cutting and rewelding the tool body.
The ranges above are catalogue selection guidance rather than guaranteed limits. Abrasiveness, fracture pattern, confinement and drilling parameters must also be considered.
Soft formation
Soft to Medium Formation
Medium to Hard Formation
Hard to Very Hard Formation
Review standard Diamond Compact PDC Bit configurations below. Final dimensions and connections are confirmed during application review.
Clean and inspect the slot pocket before installation. Confirm the cutter model, orientation, fastener specification and required torque, then install all washers and spring-lock components in the approved sequence.
After each run, inspect the teeth or inserts, cone rotation, bearing and seal response, holder, bolts and pocket contact surfaces. Replace the cutter module if wear, looseness, cracking or rotation resistance exceeds the approved limit.
Protect the inserts, cone and mounting faces from impact and contamination. Store cutter modules dry, keep matched fastening hardware together and apply suitable corrosion protection for extended storage.
It is used as a removable rolling cutter module on compatible HDD and microtunneling reaming tools. The system allows the cutting assembly to be serviced without welding it directly to the reamer body.
The current catalogue lists MH-7R, MH-3R and 12MH-3R, with nominal cone sizes of 7.875, 8.5 and 12.5 inches respectively.
Milled tooth is intended for softer formations, while chisel, conical and spherical structures progressively address stronger rock. Final selection must also consider abrasiveness, fractures, confinement and available operating parameters.
Yes, when the worksite has the approved procedure, compatible replacement module, correct fasteners and suitable lifting and torque equipment. The pocket and retention components must be inspected before reassembly.
Provide the reamer diameter, pocket drawing or dimensions, required cutter model, formation description, rock-strength data where available, rig torque and thrust limits, and photographs of the existing mounting interface.
Inspect insert loss or breakage, uneven wear, cone rotation, bearing play, seal condition, holder cracking, bolt condition and pocket contact surfaces. Record the findings before returning the tool to service.
No. They are published envelope dimensions for model identification. Obtain the controlled model drawing before manufacturing a pocket or confirming interchangeability.
Share your reamer diameter, pocket drawing, formation data and rig limits. DRILLNOVA will review the model, cutting structure and mounting compatibility for your application.
Tell us about your ground conditions, bore requirements or tooling needs. Our HDD tool specialist will review your information and recommend the appropriate next step.
For faster review, include the tool type, bore diameter, ground conditions, drill rig and required connection when available.
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