Double Ended Carbide Drill Bits

Double-Ended Carbide Drill Bits for Precision Metal Drilling

Manufactured from premium tungsten carbide, our double-ended drill bits feature dual cutting heads that extend operational life and reduce tool changeover frequency. The 135° self-centering point angle eliminates pre-drilling requirements for most ferrous metals. These tools complement our complete range of carbide drills for CNC machining centers processing steel, stainless, and cast iron workpieces.

Technical Specifications

Performance Advantages

Extended Tool Life

The double-ended configuration provides two independent cutting edges. When the first end reaches its wear limit (typically 0.010-0.015″ flank wear), the tool can be reversed to use the second end. This design may extend operational cycles between tool replacements depending on application conditions.

Reduced Setup Time

The 135° self-centering point angle provides stable starting without center drilling for most ferrous materials. This geometry can reduce setup operations compared to 118° conventional point drills.

Cost Efficiency

Tungsten carbide construction maintains edge sharpness longer than high-speed steel alternatives in most metalworking applications. Actual performance varies with material hardness, cutting parameters, and coolant conditions.

Compatible Equipment & Applications

Designed for CNC machining centers, drilling machines, and multi-spindle production equipment. Applications include:

• Automotive component manufacturing (engine blocks, transmission housings)
• Precision mold and die fabrication
• Aerospace part production (aluminum and titanium alloys)
• General metalworking and job shop operations
• Small to medium-batch production (100-10,000 parts)

Material Compatibility & Cutting Parameters

The following table provides starting parameters. Adjust based on your specific machine tool capabilities, workpiece condition, and quality requirements:

Application Boundaries:

• Not recommended for hardened steel above HRC 45 without consultation
• Titanium alloys require specialized parameters and coating selection
• Ceramic materials are outside the design envelope for this tool geometry

Application Guidelines

Setup & Installation

• Verify tool holder runout does not exceed 0.0005″ (0.013mm) to prevent premature wear
• Use precision collets (ER series) or drill chucks with gripping torque of 15-20 Nm
• Inspect chuck jaws and collet seats for wear before each setup
• Clean spindle taper and tool holder interface to maintain concentricity

Machining Parameters

• Reference the Material Compatibility table for starting parameters
• For difficult-to-machine materials, reduce cutting speed by 30-40% and apply high-pressure coolant (800-1,000 PSI minimum)
• Maintain consistent chip load of 0.001-0.004″ per revolution depending on material
• Use peck drilling cycle for holes deeper than 3x diameter to ensure effective chip evacuation

Chip Management & Coolant

• Maintain continuous chip evacuation to prevent chip packing, especially on holes exceeding 2x diameter depth
• Apply through-spindle coolant or high-pressure external coolant (minimum 100 PSI) for optimal heat dissipation
• For blind holes, reduce feed rate by 20% in final 0.5x diameter to prevent chip compaction

Tool Reversal & Inspection

• Clean tool shank thoroughly with solvent before reversing to secondary cutting end
• Inspect cutting edges under 10x magnification for chipping, excessive wear land (>0.010″), or built-up edge formation
• Replace or resharpen tool when flank wear exceeds 0.015″ or hole diameter variation exceeds tolerance requirements
• Document holes drilled per end to establish predictable tool life cycles for your specific applications

Quality Assurance

As an ISO 9001:2015 certified manufacturer, we implement comprehensive quality control throughout production. Each batch includes:

• Traceability documentation: Unique batch codes for complete material and process tracking
• Dimensional inspection reports: Diameter tolerance ±0.0005″, point angle ±2°, concentricity within 0.001″ TIR
• Material certification: Composition analysis confirming tungsten carbide grade and cobalt binder content
• Performance testing: Sample drilling tests on reference materials to verify cutting performance
• Extended certifications: Material test reports (MTR), PPAP documentation, and first article inspection available upon request

Technical support available for application troubleshooting and failure analysis.

Request Custom Quote

For Engineering Teams

Send us your technical requirements for application-specific recommendations within 24 hours:

Required Information:

• Workpiece material grade and hardness (e.g., AISI 4140 HRC 28-32)
• Machine tool model and spindle speed range (e.g., DMG Mori NLX 2500, max 6,000 RPM)
• Coolant system type and pressure (flood/mist/through-spindle, PSI rating)
• Hole specifications: diameter, depth, and length-to-diameter ratio (L/D)
• Tolerance requirements (e.g., H7, ±0.002″)

You Will Receive:

• Tool specification recommendations
• Starting parameter window (speeds and feeds)
• Coating selection guidance
• Failure troubleshooting checklist

For Procurement Teams

Request pricing within 24 hours by providing:

1. Quantity requirements: Unit quantity and annual volume forecast
2. Delivery schedule: Target lead time and recurring order frequency
3. Specifications: Diameter, coating type, overall length
4. Additional requirements: Custom packaging, inspection certificates, or special marking

Ordering Options:

• Standard specifications: MOQ 50 pieces, 7-10 working days
• Custom specifications: MOQ 100-200 pieces, 15-25 working days depending on complexity
• OEM/private labeling supported with volume commitments

Submit your technical specifications or call our engineering hotline for immediate assistance.

Technical FAQ

Q1: How does the dual-head design affect tool life compared to single-ended drills?

The double-ended configuration provides two independent cutting edges. When the first end reaches its wear limit (typically 0.010-0.015″ flank wear), the tool can be reversed to use the second end. This effectively extends the operational cycle before tool replacement is required.

Example application data (AISI 1045 steel, 3x diameter depth, flood coolant):

• First end: approximately 2,000-2,400 holes (results may vary)
• Second end: approximately 1,800-2,200 holes
• Total: 3,800-4,600 holes per tool

Results depend heavily on material condition, machine rigidity, cutting parameters, and quality requirements.

Q2: What is your minimum order quantity and lead time?

Standard specifications (1/8″ diameter, uncoated, 135° point):

• MOQ: 50 pieces
• Lead time: 7-10 working days from order confirmation

Custom specifications (non-standard diameters, special coatings, modified geometries):

• MOQ: 100-200 pieces depending on complexity
• Lead time: 15-25 working days

Expedited production may be available for critical applications. Premium pricing and MOQ adjustments apply.

Q3: How do I select the appropriate coating for my application?

Coating selection depends on workpiece material thermal properties and chemical reactivity:

• Uncoated: Aluminum alloys and non-ferrous materials (coating may cause aluminum adhesion and built-up edge formation)
• TiN (Titanium Nitride): General-purpose for low-carbon steel and cast iron; increases surface hardness to approximately HV 2,300
• TiAlN (Titanium Aluminum Nitride): Alloy steels and materials up to HRC 45; heat resistance to approximately 800°C
• AlTiN (Aluminum Titanium Nitride): Stainless steel, high-temperature alloys, and abrasive materials; maximum heat resistance to approximately 900°C

For operations requiring pre-drilling or chamfering before using double-ended drills, consider pairing with carbide spot drill bits for center starting. Our technical team provides coating recommendations based on your specific material grades, hardness readings, and cutting parameters.

Q4: Can these drills be resharpened, and do you offer regrinding services?

Yes, double-ended drills can be professionally resharpened when flank wear reaches 0.010-0.015″. Proper regrinding typically restores 85-90% of original tool life depending on remaining tool body and web thickness.

Regrinding services available:

• Factory regrinding with strict adherence to original point angle, web thickness, and clearance angle specifications
• Approximate cost: 30-40% of new tool price
• Turnaround: 7-10 working days

Alternatively, we can provide detailed grinding specifications for local tool room operations using 5-axis CNC tool grinders.

Q5: What information do I need to provide for a technical consultation?

For accurate tool recommendations and cutting parameter guidance, provide:

1. Material specification: Grade designation (e.g., AISI 4140, SS 316L) and hardness reading (HRC or HB)
2. Machining operation: Hole diameter, depth, and blind/through specification
3. Machine tool data: Model, spindle speed range, and maximum feed rate capability
4. Coolant system: Type (flood/mist/through-spindle) and delivery pressure (PSI)
5. Quality requirements: Tolerance band, surface finish requirement (Ra value), and hole straightness specification
6. Production volume: Batch size and annual forecast

Our engineering team will respond within 24 hours with tool specifications, starting parameters, and expected performance envelope.

Additional Resources

For high-volume requirements, custom geometries, or application engineering support, our technical team provides comprehensive machining consultation. Contact our engineering team to discuss your specific drilling applications and receive detailed technical recommendations for tungsten carbide tooling solutions.