High-precision solid carbide drill for flat-bottom holes, blind holes, counterbores, and step-hole machining.

Product Overview

High Precision Solid Carbide Flat Bottom Drill is designed for CNC machining applications where conventional twist drills cannot provide the required bottom geometry and dimensional consistency. Its flat cutting geometry is optimized for producing flatter hole bottoms, making it suitable for blind holes, counterbores, step holes, and precision finishing operations.

Manufactured from ultra-fine grain solid tungsten carbide and processed through CNC ultra-precision grinding, the drill is designed to deliver stable cutting performance, low runout, and consistent hole quality. It is available for different metal materials and can be customized for specific machining requirements.

Key Product Advantages

1. Flat Bottom Hole Machining

The flat-bottom cutting geometry helps produce a more uniform hole bottom than a conventional pointed drill. This makes the tool particularly suitable when the bottom surface affects component positioning, assembly, sealing, or functional performance.

It can help reduce additional machining and deburring operations, improving efficiency in repetitive CNC production.

2. High Precision and Low Runout

The drill is manufactured using one-piece sintering and full CNC ultra-precision grinding. Diameter tolerance can reach H7/H8, while total tool runout can be controlled to 0.005 mm under specified manufacturing conditions.

Low runout helps improve cutting stability, reduce vibration, and maintain consistent hole dimensions during precision machining.

3. Ultra-Fine Grain Solid Carbide

The solid carbide substrate provides high hardness and wear resistance for demanding metalworking applications. With a hardness of HRA92-93, the tool is designed to resist friction, deformation, and cutting-edge wear.

Under suitable machining conditions, its service life can reach approximately 5–8 times that of conventional HSS drills, helping reduce tool changes and maintain production consistency.

4. Multiple Coating Options

Different workpiece materials require different cutting-tool characteristics. Available coating options include:

• TiN

• TiCN

• TiAlN

• AlCrN

These coatings provide options for wear resistance, high-temperature machining, and different material-processing requirements.

5. Wide Material Compatibility

The drill can be applied to a variety of metal materials, including:

• Mild steel

• Carbon steel

• Alloy steel

• Die steel

• Stainless steel

• Cast iron

• Aluminum alloy

• Copper alloy

• Titanium alloy

With the appropriate configuration and cutting parameters, it can also be used for materials with hardness up to approximately HRC65.

Product Specifications

Recommended Applications

The High Precision Solid Carbide Flat Bottom Drill is suitable for machining operations where controlled hole geometry is important.

Typical applications include:

• Blind hole drilling

• Flat-bottom hole machining

• Counterboring

• Step-hole machining

• Mold manufacturing

• Automotive components

• Aerospace parts

• Electronic hardware

• Medical device components

• Hydraulic components

• Pneumatic components

• General precision CNC machining

For mold components, hydraulic parts, and automotive components, a consistent flat-bottom hole can simplify assembly and reduce the need for secondary finishing.

Recommended Cutting Conditions

Cutting speed and feed should be selected according to tool diameter, workpiece material, machine rigidity, coolant, hole depth, and workholding.

For reference, a 6 mm drill can use approximately:

These values should be treated as starting parameters. Actual production settings should be verified through machining trials and adjusted according to the specific CNC equipment and workpiece conditions.

Installation and Machining Guidelines

Proper tool setup is essential for achieving the accuracy expected from a precision carbide drill.

• Keep tool overhang as short as practical.

• Control tool runout within 0.02 mm during installation.

• Avoid lateral feeding and helical milling.

• When machining inclined surfaces, reduce spindle speed and feed by approximately 50% as a starting point.

• Use an appropriate peck drilling cycle when chip evacuation becomes difficult.

• Ensure suitable coolant delivery for the selected material and cutting conditions.

Correct installation helps reduce vibration and cutting-force imbalance while allowing the tool's precision-ground geometry to perform effectively.

Why Use a Flat Bottom Drill Instead of a Conventional Twist Drill?

A conventional twist drill uses a pointed cutting geometry that naturally creates a conical bottom in a blind hole. If a flat seating surface is required, an additional machining operation may be necessary.

A flat bottom carbide drill is designed specifically around this requirement. It can produce a flatter bottom directly during drilling, potentially reducing secondary operations, machining time, and process variation.

For batch production, this can be particularly valuable because eliminating an additional finishing step can simplify workflow and improve repeatability across large quantities of parts.

OEM and Customized Tool Solutions

Standard tools may not always match a customer's exact machining process. Diameter, overall length, flute length, shank dimensions, coating, and cutting geometry can be customized according to specific applications.

Available customization options include:

• Non-standard diameters

• Customized overall lengths

• Special flute designs

• Customized point geometry

• Different coating selections

• Laser logo marking

• Private-label packaging

The diameter range covers 1.0–20.0 mm, providing flexibility for different precision drilling requirements.

Manufacturer Capability

CHANGZHOU BOSTONTOOL CO.,LTD. specializes in the development and production of precision cutting tools, including solid carbide drills, milling cutters, reamers, and customized tools.

Established in 2013, the company has developed manufacturing capabilities supported by more than 20 high-precision SAACKE and WALTER machines and an MES-based production management system. Its production capabilities cover both standard tooling and customized solutions for specialized machining applications.

For distributors, machining companies, and industrial buyers, customized dimensions, coatings, marking, and packaging can be developed according to project requirements.

Application-Focused Precision Drilling

A reliable blind-hole process requires more than simply selecting a drill with the correct diameter. Bottom geometry, dimensional tolerance, runout, substrate quality, coating, machine setup, and cutting parameters all contribute to the final result.

The High Precision Solid Carbide Flat Bottom Drill provides a dedicated tooling option for manufacturers that need controlled flat-bottom holes, counterbores, step holes, and blind-hole machining. Its solid carbide construction, precision grinding, low-runout design, multiple coating options, and customizable configurations make it suitable for a wide range of CNC metalworking applications.

For manufacturers seeking to improve blind-hole consistency while reducing unnecessary secondary machining, High Precision Solid Carbide Flat Bottom Drill offers a practical precision-cutting solution from CHANGZHOU BOSTONTOOL CO.,LTD.