NX and BX are standardized drill bit sizes used primarily in exploration drilling, mineral prospecting, and geotechnical investigations. They belong to the " system, designed to extract cylindrical rock cores for analysis.

Key Features:
Size Standards:
NX: 75.7 mm (2.98 in) hole diameter, 54 mm (2.13 in) core diameter.
BX: 59.9 mm (2.36 in) hole diameter, 42 mm (1.65 in) core diameter.
Both adhere to AQ (A-Series Quad) wireline drilling standards.
Design:
Tungsten carbide or diamond-impregnated cutting surfaces.
Compatible with wireline coring systems for efficient core retrieval.
Applications:
Mineral Exploration: Sampling ore deposits (gold, copper, etc.).
Geotechnical Engineering: Soil/rock strength analysis for construction.
Oil & Gas: Shallow hydrocarbon reservoir studies.
Environmental Drilling: Groundwater or contamination studies.
Advantages:
High core recovery rates (90%+).
Reduced downtime with wireline retrieval.
Standardized sizing ensures global compatibility.