Flat Bottom Drill

Overview

A Flat Bottom Drill in solid carbide creates clean, burr‑free bottoms without secondary milling or counterboring. The design combines sub‑micron edge accuracy, stable geometry, and an optional internal coolant path. It performs reliably in steels, stainless steel, cast iron, aluminum, and other non‑ferrous materials.

Key Advantages

• Forms a true flat with a near 180° point.


• Reduces entry and exit burrs, even on angled faces.


• Resists walking and chatter on intersecting or cross‑holes.


• Low axial force protects thin webs and delicate features.


• Tight runout control supports precision fits and reaming‑ready finishes.


• Consistent cycle time reduction through one‑pass bottom finishing.

Applications

Use this drill to replace multi‑step drilling and counterboring while improving bottom flatness. It is effective on angled surfaces and when breaking into or out of intersecting features. Typical uses include:

• Spotfacing and O‑ring seats


• Pocket bottom cleanup


• Thin‑wall and stacked setups


• Non‑ferrous work where low burr and good finish are critical

Specifications & Options

Diameters are available in metric and inch sizes, with short to extended flute options. Standard sizes cover common ranges; micro sizes protect small features with optimized web thinning and edge prep.

Geometry uses a reinforced core for stability, tailored chisel and corner design for chip control and flatness, plus edge honing and polished flutes to resist wear and micro‑chipping. Corner protection options include a chamfer or small radius for harder materials.

Flute count and helix angle are tuned for chip evacuation. A higher helix supports non‑ferrous materials; balanced helix suits steels and stainless.

Choose the coolant‑through option for deeper features or high‑duty cycles. Internal ports direct flow to the cutting edges for chip control and thermal stability. Solid versions suit short holes, dry cutting, or MQL.

Materials & Coatings

A premium carbide substrate is matched with coatings by material class:

• Aluminum and non‑ferrous: DLC or TiB2 minimizes built‑up edge and improves finish.


• Steels, stainless, and cast iron: AlTiN, TiAlN, or nano‑layer systems increase hot hardness and oxidation resistance.

Toolholding & Shank Options

Each balanced tool features an h6 shank for secure clamping. Choose a plain shank for maximum concentricity or a Weldon shank for pull‑out resistance.

Follow recommended runout tolerances and use a precision collet or hydraulic chuck to safeguard hole quality and tool life.

How to Specify

Share workpiece material and hardness, hole stack and bottom condition, machine rigidity, spindle power, coolant capability, and clamping method.

Drawings or samples help tailor geometry, corner prep, chip breakers, and coolant paths. Support is available from prototype through scalable production.

Manufacturing & Quality

Tools are ground on Swiss TTB, WALTER HELITRONIC, DECKEL, and ANCA systems for sub‑micron accuracy and a smooth cutting edge.

ZOLLER measuring and video inspection verify diameter, runout, and edge prep for repeatability.

ISO 9001 processes and automated production ensure consistent quality. Our Changzhou facility supports fast lead times, a stable supply, and responsive technical assistance, with proven presence at JIMTOF and the Canton Fair.

Selection Tips

• For non‑ferrous materials, use DLC or TiB2 to reduce burrs and cutting forces.


• In steels and stainless, choose AlTiN/TiAlN or nano‑layer coatings for heat resistance.


• On thin or angled surfaces, a flat‑bottom drill offers more stable bottoms than an end mill.


• Balance core strength with available machine torque.


• Use coolant‑through for deeper features; start with conservative speeds and feeds, read chip color and shape, then adjust.

Related Tools

Pair with solid carbide end mills and forming cutters for chamfering and deburring. Follow with reamers or boring tools for tighter hole tolerances and fine finishes. Prepare threads with threading tools and tungsten steel taps. Match h6 shanks with a high‑precision collet chuck or hydraulic chuck to control runout.

Contact

Discuss your application or request a quote to select the right tool and options.