CD Series Solid Carbide Drill Bits | 1-20mm 5XD Coolant Through Drill for Cast Iron

Product Introduction

The CD Series Solid Carbide Drill Bits are designed specifically for cast iron machining, covering diameters from 1mm to 20mm with a standard 5XD drilling ratio and coolant-through design. They are suitable for gray cast iron, ductile cast iron, vermicular cast iron, chilled cast iron, and powder metallurgy materials.

Built with a K-grade ultra-fine grain carbide substrate, reinforced drill point, polished flute geometry, and nano composite coating, the drills are designed to handle abrasive and high-wear machining conditions. The structure supports stable centering, effective chip evacuation, and consistent hole quality during continuous production.

These carbide drills are suitable for CNC machining centers, CNC drilling and milling machines, and automated production lines used in automotive components, mechanical castings, hydraulic equipment, pumps, valves, and other industrial applications.

Key Product Features

K-Grade Ultra-Fine Grain Carbide Substrate

The drill uses a K-series ultra-fine grain carbide substrate, including YG6/YG8 grade options. The material provides high hardness, red hardness, and impact resistance for abrasive cast iron machining.

Compared with conventional HSS and cobalt drills, the carbide substrate is designed for longer service life and reduced tool replacement frequency in batch production.

Reinforced 140° Drill Point

The reinforced 140° drill point improves centering stability and cutting-edge strength. The rounded and honed cutting edge helps distribute cutting loads and improves resistance to chipping when drilling cast surfaces containing sand holes or hard inclusions.

The point geometry supports one-step positioning without requiring center spotting or pre-drilling under suitable machining conditions.

Optimized Flute for Cast Iron Chips

The widened low-helix flute geometry combines tool rigidity with efficient chip evacuation. The polished flute surface reduces the tendency of fine cast iron powder to adhere to the tool and helps prevent chip accumulation around the cutting area.

This design is particularly suitable for the short, powdery chips commonly generated during cast iron drilling.

Nano Composite Wear-Resistant Coating

The multi-layer nano composite coating helps reduce cutting friction, heat generation, and material adhesion. It supports stable cutting performance under high-speed machining conditions and helps maintain cutting-edge performance during extended production runs.

Coolant-Through Design

The internal coolant-through structure allows cutting fluid or compressed air to reach the cutting zone. It supports effective chip removal during 5XD drilling and can be used for wet or suitable dry cutting processes with compressed-air chip evacuation.

High-Speed and High-Feed Capability

The CD series is engineered for high-speed cast iron drilling. When the recommended cutting parameters and machine conditions are properly matched, it can support efficient batch processing while reducing tool changes and production interruptions.

Cast Iron Machining Advantages

Cast iron can contain abrasive graphite particles, casting sand, hard inclusions, and irregular surfaces that accelerate tool wear. The CD Series Solid Carbide Drill Bits address these conditions through a combination of wear-resistant carbide, reinforced cutting geometry, polished chip flutes, and low-friction coating.

The resulting tool configuration is intended to reduce common drilling issues such as:

• Premature cutting-edge wear

• Drill tip chipping

• Tip coking and material adhesion

• Chip accumulation

• Unstable centering

• Poor hole surface finish

• Tool damage during interrupted cutting

Applicable Materials

The CD series can be used for a range of cast iron and related materials, including:

• Gray cast iron such as FC250

• Ductile cast iron such as FCD450

• Vermicular cast iron

• Chilled cast iron

• Powder metallurgy materials

• Pre-cast holes and cast components requiring drilling or finishing

Actual tool selection and cutting parameters should be determined according to the material grade, workpiece structure, machine rigidity, hole depth, and production conditions.

Application Areas

Automotive Manufacturing

Suitable for drilling cast iron engine components, cylinder blocks, and other automotive castings requiring repeatable hole quality and production efficiency.

Pump and Valve Manufacturing

The drills can be applied to cast iron pump bodies, valve components, and related industrial castings.

Mechanical Equipment

Suitable for machining mechanical castings, machine tool components, equipment housings, and other cast iron parts.

Hydraulic Equipment

The 1-20mm diameter range provides options for drilling various holes in hydraulic castings and related components.

Automated CNC Production

The 5XD geometry and coolant-through design are suitable for CNC machining centers, drilling and milling machines, and automated production lines.

Technical Specifications

5XD Standard Size Parameters

Recommended Cutting Conditions

The following values are reference cutting conditions for gray cast iron FC250 and ductile cast iron FCD450.

Vc = Cutting Speed (m/min); f = Feed Rate (mm/rev)
Data sequence: Lower Limit – Recommended – Upper Limit.

Actual cutting parameters should be adjusted according to machine rigidity, spindle capability, workpiece condition, hole depth, workholding, and cooling method.

Dry Cutting and Compressed Air

Cast iron machining can often be performed with limited cutting fluid because of the material's chip characteristics. The CD series supports dry cutting under suitable machining conditions.

When dry drilling is selected, compressed air can be supplied through the coolant-through channel to assist chip evacuation and reduce heat accumulation around the cutting edge. For demanding applications, the cooling and chip-removal method should be evaluated together with cutting speed and feed rate.

Hole Quality and Machining Stability

The reinforced point geometry helps maintain stable centering when drilling cast surfaces, while the polished flute supports continuous chip evacuation. The combination is intended to improve hole consistency during repeated CNC machining.

For irregular castings, interrupted cutting, or workpieces containing casting sand and hard inclusions, appropriate feed rates, machine rigidity, and workholding remain important for preventing tool damage and maintaining hole accuracy.

OEM and Custom Tool Options

In addition to standard 1-20mm 5XD sizes, customization can be provided for specific machining requirements.

Potential customization options include:

• Non-standard drill diameters

• Special cutting lengths

• Customized flute geometry

• Special coatings

• Customer logo laser engraving

• OEM/ODM tool configurations

Sample testing and bulk production orders can be arranged according to the required specification and quantity.

B2B Purchasing Advantages

Complete Diameter Range: Standard sizes from 1mm to 20mm cover a broad range of cast iron drilling requirements.

Cast Iron-Oriented Design: The carbide substrate, reinforced point, flute geometry, and coating are optimized for abrasive cast iron machining.

Production Efficiency: Long-wear cutting performance helps reduce tool changes and production interruptions in batch processing.

Flexible Cooling: The coolant-through design supports liquid coolant and compressed-air chip removal.

CNC Compatibility: Suitable for machining centers, CNC drilling and milling machines, and automated production lines.

Custom Manufacturing: Non-standard dimensions, flute configurations, coatings, and logo engraving can be considered for OEM/ODM orders.

Quality Control and Manufacturing

CHANGZHOU BOSTONTOOL CO.,LTD. focuses on the development and production of carbide cutting tools for industrial machining applications. Tool manufacturing covers carbide blank selection, precision grinding, cutting-edge preparation, coating treatment, and final inspection.

Quality control is applied throughout the production process to help maintain dimensional consistency, cutting-edge quality, and stable batch performance.

For customers purchasing tools for continuous cast iron production, technical support can also be provided for cutting parameter selection and machining-condition optimization.

Packaging, Delivery and Storage

The drills should be securely packaged to protect the cutting edges during handling and long-distance transportation. Packaging can be arranged according to order requirements.

Delivery time depends on the selected specifications and order quantity. Standard sizes and customized tools may have different production schedules.

For transportation and export orders, packing and shipping arrangements can be confirmed with the supplier before order placement. Customers should store carbide drills in a clean, dry environment and protect the cutting edges from impact or contamination.

FAQ

What makes these drills suitable for cast iron?

The CD series combines a K-grade ultra-fine grain carbide substrate, reinforced drill point, polished low-helix flute, and nano composite coating to address abrasive wear, chip accumulation, and edge damage commonly encountered in cast iron drilling.

What cast iron materials can be machined?

The drills are suitable for gray cast iron, ductile cast iron, vermicular cast iron, chilled cast iron, and selected powder metallurgy materials.

Can the drills be used for dry cutting?

Yes. The design supports dry cutting under suitable conditions, with compressed air available through the coolant-through channel for chip evacuation. Actual machining conditions should be selected according to the workpiece and machine setup.

Why is the reinforced drill point important?

Cast iron castings may have uneven surfaces, sand holes, and hard inclusions. The reinforced point and rounded cutting-edge design improve resistance to chipping and help maintain stable centering under demanding drilling conditions.

Are custom drill sizes available?

Yes. OEM/ODM options can include non-standard diameters, special flute lengths, customized coatings, flute configurations, and customer logo engraving, subject to technical evaluation.

Product Supply

For standard or customized cast iron drilling requirements, buyers can provide the required diameter, drilling depth, cast iron grade, machine type, cooling method, and expected production volume for tool selection.

The CD Series Solid Carbide Drill Bits provide a dedicated solution for cast iron drilling where wear resistance, chip evacuation, hole quality, and production stability are important. They are available for standard B2B orders as well as customized machining-tool requirements.

CHANGZHOU BOSTONTOOL CO.,LTD. supports industrial customers with solid carbide cutting tools and application-oriented machining solutions. For cast iron drilling projects, the tool configuration can be matched to the material, machine, hole geometry, and production conditions.