Product Overview

The Kyocera 21/64 DRILL 2FL 8XD TX IC SGS56488 is a premium solid-carbide drill engineered for ultra-deep-hole CNC machining. Featuring a 2-flute design with 8×D flute length, this tool delivers exceptional hole quality, dimensional accuracy, and extended tool life in demanding deep-hole production environments. The optimized TX grade substrate combined with advanced coating technology ensures stable chip evacuation and heat management across a wide range of ferrous and non-ferrous materials.

ISO Designation Breakdown

Engineering Dimensions & Geometry

Grade Details – Key Grade Characteristics

The TX grade is a nano-structured PVD-coated carbide substrate specifically developed for high-speed deep-hole drilling applications. Key characteristics include:

• Substrate: Ultra-fine grain tungsten carbide (0.5 μm grain size) with 12% cobalt binder for optimal hardness and toughness balance
• Coating: Multi-layer TiAlN + TiSiN PVD coating providing exceptional heat resistance up to 1,100°C
• Hardness: 1,930 HV30 substrate hardness with 3,200 HV coating surface hardness
• Oxidation Resistance: Enhanced thermal barrier properties for dry and MQL machining
• Coating Thickness: 3.5 μm total coating thickness with optimized adhesion layer
• Surface Finish: Mirror-polished flute surfaces (Ra 0.15 μm) to minimize chip adhesion and friction

Grade Comparison Matrix

Chipbreaker Profile

The 21/64 DRILL features an optimized chipbreaker geometry designed for 2-flute ultra-deep-hole drilling:

• Primary Land Width: 0.08 × D for stable cutting edge support
• Chipbreaker Groove Depth: 0.03 × D with variable pitch to prevent harmonic vibration
• Rake Angle: 12° positive rake for reduced cutting forces and improved chip flow
• Margin Design: Double-margin with 0.15 mm width for superior hole straightness and surface finish
• Web Thinning: Advanced web thinning reduces thrust force by up to 25% compared to standard geometries

Recommended Applications & Workpiece Materials

Application Map by Operation

Recommended Cutting Conditions

Note: Start at the lower end of the range for 8×D applications; increase gradually based on machine rigidity and hole quality requirements. Internal coolant is strongly recommended.

Operating Guidelines

• Pecking Cycle: For 8×D depths, use a high-precision peck cycle with retract to 1×D above the bottom of the previous peck. Peck depth should not exceed 1.0×D per step for optimal chip control.
• Tool Overhang: Minimize overhang to < 5×D for optimal rigidity. Use hydraulic or shrink-fit toolholders for best results.
• Coolant Pressure: Maintain internal coolant pressure ≥ 70 bar (1,000 psi) for effective chip evacuation in blind holes. Through-spindle coolant is essential for 8×D.
• Entry Surface: Ensure flat, perpendicular entry surface. Chamfer or spot-drill inclined surfaces before drilling.
• Pre-Drilling: For holes > 2×D in castings or forged surfaces, use a short drill or center drill to create a stable pilot.
• Tool Change Interval: Monitor flank wear (VB). Replace when VB reaches 0.3 mm or when hole tolerance begins to drift.
• Speed/Feed Adjustment: Reduce cutting speed by 15% when drilling stacked plates or materials with hard inclusions.

Toolholder Compatibility

Runout Requirement: Total indicated runout (TIR) at the tool point must not exceed 0.01 mm for holes requiring H7 tolerance.

Packaging & Ordering Information

• Packaging: Individual plastic protective tube with foam insert; 10 units per master carton
• Labeling: Each tube includes laser-etched part number, batch code, and ISO designation
• Minimum Order: 1 piece (no MOQ for standard items)
• Lead Time: Stock item – ships within 24 hours for orders placed before 2:00 PM
• Warranty: 12-month manufacturer defect warranty from date of purchase
• Storage: Store in original packaging at 15–25°C with < 60% relative humidity to prevent coating degradation

Catalog Meta Data

Need application support? Our technical team can assist with tool selection, parameter optimization, and custom quoting for production volumes. Contact Kyotow.com for expert CNC tooling assistance.