Dry Diamond Core Drill Bits Manufacturer & OEM Supply | Zhonghuan

What Defines a Dry Diamond Core Bit

A dry diamond core bit is designed to cut without water cooling. The segment formula uses dust-evacuation geometry — turbo spiral grooves, vacuum-brazed single-layer crystals, or sintered segments shaped to clear dust at the cutting face. Without water flushing, the bit must be matched to substrates where joint temperature stays low (tile, porcelain, AAC, brick, plain concrete) and to rigs that lack water-delivery (rotary hammers, angle grinders, handheld drills without integrated water).

For OEM procurement, dry diamond is a different product line from wet — different shank standards, different segment shapes, different bond formulas, different stocking channel. A wet bit cannot substitute for a dry bit (the segment will overheat in dust), and a dry bit cannot substitute for a wet bit (the joint geometry assumes dust evacuation, not water flow).

Zhonghuan Dry Diamond Core Bit Lines

Segment Shape for Dry Cutting

Dust evacuation is the binding constraint on a dry diamond segment. Three shapes cover almost all dry applications:

• Turbo — continuous spiral grooves cut into the segment side, the default shape for dry diamond. Excellent dust evacuation, smooth cutting feel, the volume runner for M14 hole saws and SDS-Plus dry diamond.
• Vacuum-brazed single-layer — bare diamond crystals chemically bonded to a steel substrate. Extremely sharp cutting and clean edges on porcelain, granite, and glass; limited diamond reserve (typical service life 20–100 holes).
• Crown / segmented — notched top profile with discrete cutting points. Aggressive cutting in hard substrates, used on SDS-Plus dry diamond for masonry.

See our segment shape decoder for the application-to-shape mapping across the full dry and wet ranges.

OSHA Table 1 HEPA-Vacuum Path

For US construction programs, dry diamond can satisfy OSHA 29 CFR 1926.1153 Table 1 via the HEPA-filtered vacuum + shroud path. The bit needs shroud-compatible geometry: a flat shoulder against which the shroud can seat against the substrate. For OEM RFQs targeting US dry programs, specify shroud-compatible flat-shoulder geometry alongside the dust-evacuation segment shape. See our OSHA Table 1 reference for the full HEPA-vacuum compliance path requirements.

Recommended Dry Diamond Core Bit Ranges

RFQ Checklist

• Shank standard (M14, SDS-Plus, 5/8-11 UNC, SDS-Max)
• Diameter range and quantity per size
• Target substrate (tile, porcelain, brick, concrete, AAC)
• Construction (vacuum-brazed, sintered, laser welded, silver brazed)
• Shroud compatibility for OSHA Table 1 HEPA-vacuum programs
• Side protection rim for stone fabrication (vacuum-brazed line)
• Bond hardness for dry cutting heat profile
• Packaging — blister card for retail, color box for trade, bulk for industrial

Trust Signals

• Vacuum brazing line for porcelain, granite, and glass-cutting hole saws with chemical-bond verification
• SDS-Plus dry diamond capability for the MEP installation channel
• Shroud-compatible geometry available for OSHA Table 1 HEPA-vacuum US programs
• M14 hole saw production for EU DIY and trade channels
• Cross-line consistency — same bond and concentration system across dry and wet OEM programs where appropriate