Diamond core bit factory hub: If your search starts from “diamond core bit manufacturer”, factory-direct OEM or private label, begin at our diamond core bit manufacturer RFQ hub. This page goes deeper into concrete-specific specifications for structural coring, MEP penetrations and infrastructure.
What Defines a Concrete Core Drill Bit
A concrete core drill bit is a wet diamond core bit built for cured concrete, typically strength classes C25–C50, usually with embedded rebar. Four choices follow from that substrate: a metal bond soft enough to keep exposing diamond in hard aggregate, 9–12 mm segments for long structural cuts, an unobstructed water passage because heat under load is the main failure mode, and a laser-welded segment joint because rebar contact at cutting temperature is what separates a durable joint from a lost segment.
For OEM procurement, “concrete core drill bit” is the buyer term for this configuration. The same bit appears in catalogues as “reinforced concrete coring bit”, “structural coring bit” or “wet coring bit for concrete”; the engineering target is the same. Put the concrete strength class, aggregate and rebar density in the RFQ.
Zhonghuan Concrete Core Drill Bit Spec
| Parameter | Standard Spec |
|---|---|
| Target substrate | C25–C50 cured concrete, with or without rebar |
| Diameter range | Ø25–500 mm, handheld through large structural |
| Connection | 1¼-7 UNC for medium and large bits; 1/2" BSP or 5/8-11 UNC for small bits, matched to the drill spindle |
| Segment attachment | Laser welded; weld penetration checked on a metallographic cross-section per lot |
| Segment height | 9–10 mm standard, 12 mm heavy-duty |
| Bond | Metal bond tuned to strength class, aggregate hardness and rebar |
| Tube body | 30CrMnSi seamless tube, wall thickness per diameter |
| Water passage | Unobstructed and sized to the connection; water-flow check on QC samples |
Substrate-Matched Configurations
| Substrate Description | Bond + Segment | Application |
|---|---|---|
| C25 cured concrete, light rebar | Medium-soft bond, 9–10 mm segment | General building MEP penetrations |
| C30–C35 reinforced concrete, dense rebar | Soft bond, 10–12 mm segment | Structural coring, parking structures |
| C40–C50, hard aggregate, heavy rebar | Very soft bond, 12 mm segment | Bridge decks, infrastructure |
| Precast and post-tensioned elements | Soft bond, 10 mm segment | Openings after the tendons are located by scanning and the core position is approved; tendons are never cut |
| Young concrete (early age) | Harder bond for the abrasive, not yet hardened paste; 9 mm segment | Early coring once the structural engineer releases the element |
Wet Coring and OSHA Table 1
For US projects, OSHA 29 CFR 1926.1153 Table 1 lists rig-mounted core saws or drills with one control: a tool with an integrated water delivery system that supplies water to the cutting surface, operated and maintained to the manufacturer’s instructions. Handheld and stand-mounted drills are listed with a shroud or cowling and a dust collection system instead. Compliance comes from the employer’s control method on site; the core bit supports the wet method by passing water freely to the segments.
For US distributor lines, state in the RFQ which Table 1 method the bits will serve. We confirm the water passage for the connection, run a water-flow check on QC samples, document the weld type, and confirm fit on the drills you name during sample approval.
RFQ Checklist
- Diameter range and quantity per size, with the connection for each
- Concrete strength class (C25, C30, C35, C40, C50), aggregate and rebar density
- Wet or dry coring, and the OSHA Table 1 method for US programs
- Target drill models (Hilti DD, Milwaukee MX FUEL, Husqvarna DM/DMS, Bosch GDB)
- Segment height (9–10 mm standard, 12 mm heavy-duty)
- Kerf width (3.0–3.5 mm typical for concrete coring)
- Bond hardness against the substrate description, not a code letter
- Water-flow check on QC samples
- Laser weld cross-section per lot
- 30CrMnSi tube mill certificate per batch
- Witness drilling on the target concrete with rebar
- Packaging: white box, private label, color box, blister
Trust Signals
- Water-flow check on QC samples for every wet line
- Laser-welded segment-to-tube joint with a metallographic cross-section per lot
- 30CrMnSi seamless tube with mill certificate per batch
- Witness drilling on target concrete with rebar before mass production
- Connection check per lot, with fit confirmed on your named drills during sample approval
Build Your Concrete Core Drill Bit Range
Send the concrete strength class, rebar density, diameter range, drill models and annual volume. We respond with a concrete coring specification, a water-flow and witness-drilling plan, and the quotation path.
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