What to Do When the Hole Meets Steel
When a concrete hole meets rebar, the next step depends on the tool in your machine. A reinforced-concrete hammer bit follows its specified drilling mode; our dedicated crown rebar cutter cuts the steel with the hammer switched off, before you return to the concrete bit. For larger penetrations, a matched wet diamond core system provides another route.
This guide explains how to identify the obstruction, choose the right workflow and complete the hole where the reinforcement-cutting path has been approved.
- Continue with a suitable hammer bit: the exact model is rated for the reinforced-concrete task, the hole path is approved and the head is serviceable. Follow its specified mode and feed.
- Change to a dedicated cutter: our crown cutter passes the steel in a concrete pilot hole, then the concrete bit finishes the depth.
- Review the hole position or coring setup: an unidentified obstruction, damaged head, unsuitable machine or unapproved reinforcement cut needs a different setup before work resumes.
Locate the Reinforcement and Check the Bit
Use the drawings and a suitable scanner or cover meter to establish reinforcement position, depth and the intended hole path. Cover and spacing vary with the structure; a fixed grid or cover assumption is not a locating method. Identify post-tensioned zones and services before starting.
A change in sound, lost progress, deflection or metallic particles can indicate steel contact. Hard aggregate or packed dust can also stop progress, so sound alone is not proof. Stop, inspect the cutting edges and clear the hole using the specified dust-control method.
Inspect the bit after a rebar strike
Three Practical Drilling Workflows
| Workflow | Suitable task | Machine and mode | Changeover | Length to confirm |
|---|---|---|---|---|
| Reinforced-concrete hammer drilling | Repeated reinforcement encounters in holes within the selected bit’s application range | Matching SDS-Plus / SDS-Max rotary hammer; specified hammer-drilling mode | Keep the same approved bit while it remains serviceable | Working length and flute clearance to the required hole depth |
| Our dedicated crown rebar cutter | Steel removal after the concrete pilot hole reaches an approved bar crossing | Compatible SDS-Plus machine with rotation-only mode; hammer off | Concrete bit → crown cutter → concrete bit | Working reach to the steel and active crown / chip-clearance section |
| Wet diamond core drilling | Penetrations suited to a diamond core system in reinforced concrete | Matched core drill, bit, mounting and water supply; rotation with water | Core bit cuts concrete and steel in the same coring workflow | Barrel length, mounting clearance and required penetration depth |
Full carbide describes the head construction; four-cutter describes the edge arrangement. Our full-carbide-head bits have a carbide head joined to a steel body and shank. A brazed multi-insert head is another professional construction. Select the exact model’s reinforced-concrete application rather than treating every brazed two- or four-cutter as unsuitable.
Bosch PRO SDS plus-5X, for example, uses an embedded carbide cross and is specified for reinforced concrete. Its application statement belongs to that model.
Operating mode is also model-specific. Our crown cutter requires rotation only. DEWALT DWA54780 explicitly permits hammer mode, while Milwaukee describes HAMMER GUARD as protection from accidental hammer impacts. An SDS-Plus shank or protective feature does not change our cutter’s mode.
Rebar cutter vs full-carbide head: tool selection
Step by Step, Route by Route
With a reinforced-concrete-rated full-carbide head
- Confirm the bit diameter, working length and machine capacity for the hole. Start under control and use the model’s specified hammer-drilling setup.
- At an approved bar crossing, maintain steady feed within the tool instructions. If progress stops or the head is damaged, stop and reassess rather than adding force.
- Clear dust and chips as needed for the hole depth and extraction setup. Use the model’s instructions instead of a universal withdrawal interval.
- Finish the hole, check head condition and hole geometry, then clean and install the anchor according to its installation instructions.
With our rotation-only crown rebar cutter
- Drill the concrete pilot hole with the concrete bit. Stop at the obstruction and confirm the approved steel-cutting path.
- Stop the machine before changing the bit or mode. Fit a crown cutter of the same nominal hole diameter and switch off hammer action.
- Confirm the cutter can reach the steel and that the selected machine or adapter provides the required rotation-only operation.
- Cut at the RPM specified for the selected model and diameter, using steady feed. Our carbide teeth cut by rotation; hammer action can seriously damage them.
- Withdraw and clear steel chips or a retained slug as required by the cutter instructions. Stop the machine before inspecting or clearing the crown.
- After passing the bar, refit the concrete bit, restore its specified drilling mode and finish the required hole depth.
With a wet diamond core system
- Match the reinforced-concrete core bit to the machine, diameter, mounting method and water requirements.
- Confirm the hole path and secure the rig where required by the system instructions.
- Maintain the specified water supply and controlled feed while crossing steel; manage slurry and drilling torque.
- Complete the core, remove it under control and follow the penetration or anchor installation requirements.
Wet diamond core-drilling range
Rebar Cutter Troubleshooting
| Symptom | Checks | Next step |
|---|---|---|
| Cutter turns without progress | Confirm steel contact, usable tooth edges, selected RPM and required working reach | Stop and inspect; clear the obstruction area, correct the setup or replace a damaged cutter |
| Frequent grabbing or stalling | Check chip / slug retention, feed, bar crossing and machine capacity | Stop, clear the crown by its instructions and resume controlled feed only with a suitable setup |
| Chipped or damaged teeth | Check accidental hammer action, visible tooth damage and trapped debris | Stop using the damaged crown; remove debris and verify rotation-only operation before replacing it |
| Cutter cannot reach the steel | Compare the measured steel depth with working reach, overall length and adapter clearance | Select a model with suitable reach; overall length alone does not establish cutting reach |
Specify Diameter and Working Reach Separately
- Hole diameter: the finished hole specification; our crown cutter matches the concrete pilot bit’s nominal diameter.
- Rebar diameter and crossing: separate job conditions, including a centred, offset or intersecting bar. Cutter diameter is not a universal maximum rebar rating.
- Overall length (L2): end-to-end tool length, with the assembly basis identified.
- Working length (L1): usable reach for the selected design; confirm it independently of overall length.
- Active flute / cutting section: the section that cuts or clears debris, recorded separately from working reach.
Our proposed 300 mm crown programme uses 300 mm overall length and 250 mm working length across reference diameters Ø12–32 mm. The selected order drawing confirms crown geometry, reach and the available combination. Operating RPM, net tool weight and packaged weight remain separate model-specific fields.
For an SDS-Max machine, check the exact adapter, available modes, permitted capacity and impact transmission. Mechanical fit alone does not approve hammer action for our rotation-only crown cutter.
When to Relocate the Hole
Review the position when the obstruction cannot be identified, the path meets a tendon or unapproved reinforcement, or the selected tool cannot complete the cut. A fixed hole position calls for a project-approved method and suitable tooling.
Choose the new position from the scan, drawings and the anchor’s spacing and edge-distance requirements. A fixed 50–100 mm shift does not guarantee clearance. Record the approved location before continuing.
Site Controls for Drilling and Cutting
- Confirm reinforcement and service locations, with the required project approval for steel cutting.
- Use dust extraction or the specified wet-coring system, plus suitable eye and hearing protection. Handle chips and hot tools only after stopping the machine.
- Use the specified side handle, clutch or torque-control system; secure core-drill mounting as required.
- Clean the completed hole and verify diameter, depth and installation requirements for the selected anchor.
Our Drilling Range for Reinforced Concrete
| Our programme | Current diameter range | Application and construction |
|---|---|---|
| 3-cutter full-carbide SDS-Plus | Ø3–20 mm | One-piece carbide head for the selected reinforced-concrete drilling task |
| ZHPLUS-8 full-carbide SDS-Plus | Ø4–25 mm | Full-carbide head for reinforced-concrete drilling with the specified machine |
| ZHPLUS-5X brazed four-cutter | Ø5–25 mm | Carbide-cross construction; match the exact model to the reinforcement encounter |
| ZHMAX-8 full-carbide SDS-Max | Ø4–25 mm | One-piece carbide head joined to steel by our RFW process |
| ZHMAX-7 multi-insert four-cutter SDS-Max | Ø16–45 mm | Heavy reinforced-concrete drilling; full-width primary blade plus two inclined, axially set-back side inserts |
| Our SDS-Plus crown rebar cutter | Ø12–32 mm | Dedicated steel-cutting changeover tool; rotation only, hammer off |
These are our current programme ranges, not limits for an entire head category. Bosch EXPERT SDS max-8X includes 32 mm full-carbide-head variants. Choose by the selected SKU, machine and hole rather than a universal 25 mm threshold.
ZHMAX-7 has three separate brazed carbide components and four active cutting edges. The full-width primary blade drives penetration; the two inclined, axially set-back side inserts support head stability and gauge retention, while head pockets direct debris into the flutes. Match its diameter, working length and reinforcement conditions to the job.
Frequently Asked Questions
Can a brazed four-cutter drill reinforced concrete?
Some models are expressly designed for reinforced concrete. Edge count and joining method alone do not establish the application. Use the selected model’s specifications and reassess if the head is damaged or drilling stalls.
Should the hammer stay on when the bit meets rebar?
Follow the exact tool instructions. Our crown rebar cutter requires rotation only with hammer action off; a reinforced-concrete hammer bit uses its specified drilling mode. Other cutter models may permit impact.
Does a 16 mm cutter mean it can cut only 16 mm rebar?
The cutter diameter identifies the nominal hole diameter. Rebar diameter, crossing position and reinforcement arrangement are separate conditions that must match the selected cutter and machine.
Does a 300 mm cutter always have 250 mm working length?
No. Our proposed 300 mm crown reference programme uses 250 mm working length, but overall, working and active cutting lengths are separate fields confirmed on the selected drawing.
Can an SDS-Max adapter make our crown cutter hammer-compatible?
No. Confirm the adapter, machine modes and capacity for the assembly. Our crown cutter still requires rotation-only operation with hammer action switched off.
Is a full-carbide head limited to 25 mm?
No universal 25 mm limit applies. Our current ZHMAX-8 SDS-Max programme covers Ø4–25 mm; other manufacturers offer larger full-carbide-head models. Compare the exact product and machine setup.
What should I send for a quotation?
Send hole diameter, rotary-hammer model and quantity. We confirm the construction, lengths, operating setup, packaging and lead time. Rebar cutters are supplied through normal purchase orders without a separate sample service.
Order the Tool for Your Hole
For distributors and tool brands, we supply SDS-Plus rebar cutters and separate full-carbide rebar bits. Choose rotation-only crowns for the steel-cutting changeover stage, or the specified full-carbide line for reinforced-concrete drilling.
Send hole diameters, rotary hammer model and quantities. We confirm working and overall lengths, the selected operating mode, bulk pack format, private-label packaging and delivery. MOQ is reviewed for the actual order. Rebar cutters are supplied through normal purchase orders without a separate sample service.
Wholesale rebar cutters, custom specifications & private-label OEM · Request a purchase quotation
