Twist Drill

Category Overview

Our twist drill range includes carbide drills and engineered non‑standard options for precise hole‑making in metals and engineered materials. Built with advanced CNC grinding and verified by strict measurement, these tools deliver stable diameters, clean finishes, and reliable accuracy from jobber length to deep‑drilling with coolant.

Materials and Selection

Carbide drills provide rigidity and wear resistance. They help maintain straightness and diameter in stainless steel, hardened tool steels, cast iron, titanium, and nickel alloys. Micro‑grain substrates, refined spiral geometry, and split points reduce heat and deflection for longer life and better surface quality.

Choose HSS options for general work in softer metals or lower‑power machines. Use carbide in demanding CNC production where heat resistance and edge retention are required.

Geometry and Chip Control

Point styles

• 118° points offer balanced cutting forces and standard penetration.


• 135° split points improve centering, limit walking, and reduce thrust in hard materials.

Flute and helix

• Higher helix and polished flutes speed chip removal in aluminum and other ductile metals.


• Lower helix designs improve stability in cast iron and brittle materials.

Step geometry

• Step drills combine pilot and finishing steps to control entry, limit burrs, and improve concentricity in thin‑wall or stacked parts.

Coolant and Surface Engineering

Through‑coolant designs deliver fluid to the cutting edges to control temperature and flush chips. This enables deeper holes with fewer peck cycles and more consistent results in stainless and high‑temperature alloys.

Coatings

• AlTiN/TiAlN for high heat resistance in steels and superalloys.


• TiCN for abrasive cast irons and carbon steels.


• DLC for aluminum and non‑ferrous materials to reduce built‑up edge.

Polished lands and lapped surfaces lower friction, helping hold size and finish on long runs.

Sizes and Tolerances

• Diameters: micro to larger production sizes.


• Lengths: stub, jobber, and long‑series to match depth requirements.


• Shanks: straight, three‑flat anti‑slip, and Weldon for secure clamping.


• Typical controls: diameter tolerance to ±0.005 mm on critical sizes; roundness and concentricity maintained with sub‑micron grinding; point angles of 118°, 135°, and custom split or pilot forms; helix angles matched to material and chip control needs.

Applications and Machines

These drills run in machining centers, lathes, and automated cells. Balanced geometry and vibration control support productive feeds while maintaining hole quality in aluminum, stainless steels, tool steels, titanium, Inconel, and cast iron. The material‑first approach promotes efficient chip flow and controlled heat.

Quality and Measurement

Swiss TTB Micro Grinding Centers, WALTER HELITRONIC, DECKEL, and ANCA platforms ensure profile accuracy for complex geometries. ZOLLER presetting and video systems (PG1000/MRPG1000) verify edge form, diameter, and runout. Ongoing checks with German instruments (EOUER) confirm adherence to the specified tolerance band. ISO9001 (2023–2026) and SGS certifications support stable, documented processes from grinding through coating and inspection. Production from our Changzhou base enables consistent lot‑to‑lot performance.

Custom Solutions

Non‑standard designs are built from drawings or samples. Point forms, step stacks, and helix angles are matched to part features, clearance needs, and burr control. Designs consider material, coolant strategy, spindle speed, and toolholding to improve life, tolerance, and cycle time. Contact us to request a quote or share your prints.

How to Choose

• Define hole size, tolerance, and depth.


• Identify material and preferred coolant approach.


• Select point angle and split point for centering and thrust.


• Match helix and flute polish to chip flow needs.


• Choose coatings for heat, wear, and adhesion control.


• Confirm shank style and precise toolholding to keep runout low.

Use Tips

• For tight bores, follow drilling with a reamer to achieve final tolerance and finish.


• In deep drilling, use controlled peck cycles or through‑coolant tools to manage chips and heat.