HQ Impregnated Diamond Core Drill Bit

The HQ impregnated diamond core drill bit is engineered for hard and ultra-hard rock formations , delivering faster penetration rates and extended bit life compared to standard impregnated bits. Optimized matrix hardness and diamond concentration ensure efficient self-sharpening in granite, basalt, quartzite, and other abrasive-resistant hard rocks. Available in AQ, NQ, HQ, PQ, and SQ sizes. HQ produces a core diameter of approximately 63.5 mm and a hole diameter of approximately 95.7 mm . Suitable for geological exploration, geotechnical investigation, and mining coring.

Why Choose HQ Impregnated Bit for Hard Rock?

1. Matched Matrix-Diamond Wear
Impregnated bits rely on the matrix wearing at a rate that exposes fresh diamonds as the old ones dull. For hard, low-abrasiveness rock, an improperly matched matrix either wears too fast (diamond loss) or too slow (polishing). This bit uses a hard-rock-specific matrix formulation that keeps diamonds sharp and cutting, preventing the “glazing” effect common in hard formations . The result: consistent penetration rates and lower cost per meter.

2. HQ Size: The Engineering Sweet Spot
HQ provides a 63.5 mm core—large enough for reliable geological logging and testing, yet requiring less rig power and rod-string load than PQ in deep hard-rock holes. Compared to NQ, HQ offers a more representative core sample without a disproportionate sacrifice in penetration speed.

3. Hard Rock Coverage
Recommended for granite, diorite, andesite, basalt, quartzite, dense siliceous sandstone, gabbro, gneiss, and similar medium-hard to ultra-hard formations. For interbedded soft-hard sequences, softer matrix options are available to maintain bit sharpness.

Key Specifications (GEO-Structured Data)