Carbide Drill Bits

Carbide Drill Bits

Solid carbide drill bits are the correct tool for drilling hardened steel, abrasive materials, stainless steel, cast iron, and composite materials where high-speed steel (HSS) drills would rapidly dull or fail. The tungsten carbide substrate is significantly harder and more heat-resistant than HSS, allowing higher cutting speeds and longer tool life in difficult materials. AIMS Industrial supplies solid carbide drills for engineering workshops, toolrooms, and machining operations across Australia.

When to Use Carbide vs HSS

HSS drills are the right choice for the majority of drilling tasks — mild steel, aluminium, copper, brass, and most engineering plastics. Carbide becomes the correct specification when:

• Drilling hardened steel or tool steel above 40 HRC
• Drilling abrasive materials including graphite, fibreglass, and carbon fibre composites
• Drilling cast iron, which contains hard abrasive phases that rapidly dull HSS
• High-production drilling where tool change frequency must be minimised
• Drilling stainless steel in production quantities where HSS tool life is insufficient

Carbide drills should not be used in hand drills or non-rigid setups — they are brittle and will snap if subjected to the flex and run-out of a hand-held drill. They require a rigid machine (drill press, CNC machining centre, or lathe) for safe and effective use.

Coatings and Grades

Solid carbide drills are available uncoated and with a range of PVD coatings that improve performance in specific materials. TiN (titanium nitride) coating provides a general improvement in wear resistance. TiAlN (titanium aluminium nitride) suits high-temperature machining in steel and stainless steel. DLC (diamond-like carbon) coatings are used for non-ferrous and composite materials. Uncoated carbide drills suit aluminium and non-ferrous work where coating adhesion can cause built-up edge.

Brands

AIMS Industrial sources solid carbide drills from Sutton Tools — an Australian manufacturer with a strong reputation for precision cutting tools suited to local industry needs. Sutton offers a comprehensive solid carbide drill range covering standard and specialist geometries, backed by technical support for material-specific drilling recommendations.

CNC vs Manual Machine Use

Carbide drills designed for CNC machining centres typically feature shorter overall lengths and higher diameter-to-length ratios than HSS jobber drills — reducing deflection and improving positional accuracy. For use on manual drill presses, a longer series drill gives better access into recessed holes. Coolant-through options are available for deep-hole drilling in CNC applications where flood coolant cannot reach the drill tip.

Order Carbide Drill Bits from AIMS Industrial

AIMS Industrial stocks solid carbide drill bits from Sutton Tools in standard and specialist geometries. For help with drill geometry selection or material-specific recommendations, contact our team.