Kyocera 5,5 TX SGS66425 Drill - Precision Drilling

Product Overview

The Kyocera 5,5 TX Solid Carbide Drill (MPN: SGS66425) is a precision-engineered precision-polished flute chipbreaker designed for high-volume production drilling in carbon steel. Manufactured to exacting ISO standards, this 2-flute 3xD drill delivers exceptional dimensional accuracy, superior surface finish, and extended tool life across demanding CNC production environments. The 5,5mm diameter is optimized for high-speed machining centers where repeatability and process reliability are critical.

ISO Designation Breakdown

Engineering Dimensions & Geometry

Grade Details — Key Grade Characteristics

The TX grade is a micro-grain tungsten carbide substrate featuring a multi-layer PVD coating engineered specifically for drilling applications in ferrous materials. Key characteristics include:

• Substrate Hardness: 92.4 HRA (ultra-fine grain structure, 0.7 μm)
• Coating Architecture: TiAlN-based multi-layer with optimized adhesion to substrate
• Coating Hardness: 3,300 HV (nano-indentation, ISO 14577)
• Coating Thickness: 2.5 ± 0.3 μm (balanced wear resistance and edge sharpness)
• Oxidation Resistance: Up to 900°C (suitable for dry and MQL machining)
• Coefficient of Friction: 0.35 against steel (reduces built-up edge formation)
• Coating Adhesion: HF1 (Rockwell C indentation, ISO 26423)
• Edge Preparation: Micro-honed radius of 15 ± 3 μm for chipping resistance

Grade Comparison Matrix

Chipbreaker Profile

The SGS66425 incorporates a precision-polished flute chipbreaker that ensures controlled chip formation across the full recommended feed range. The flute geometry features a variable helix distribution that disrupts harmonic vibration while promoting axial chip evacuation. Key chipbreaker attributes:

• Flute Form: Parabolic with polished surface (Ra ≤ 0.2 μm) to minimize chip adhesion
• Chipbreaker Angle: 12° positive rake at the periphery transitioning to 8° near the core
• Chipbreaker Width: 0.25 × D1, optimized for short, manageable chip segments
• Chip Curvature Radius: 2.5–4.0 mm (target for steel machining)
• Evacuation Capacity: Supports feed rates up to 0.25 mm/rev in steel without chip packing
• Coolant Channel: Internal through-coolant design with 1.2 mm diameter channels for 5,5 mm tool

Recommended Applications & Workpiece Materials

Application Map by Operation

Recommended Cutting Conditions

Note: Start at the lower end of the range for new applications or unstable setups. Increase parameters gradually based on tool life and surface finish requirements. Internal coolant pressure recommended ≥70 bar for optimal chip evacuation.

Operating Guidelines

• Run-in Procedure: For the first 5 holes, reduce v_c by 20% and feed by 10% to establish stable coating wear patterns.
• Tool Overhang: Minimize overhang to 3×D maximum. Use hydraulic or shrink-fit chucks for best results; collet chucks acceptable with ≤0.01 mm runout.
• Peck Cycle: For depths >2.5×D, implement peck drilling with 0.5×D peck depth and full retract to break chips. Do not use partial peck in blind holes.
• Coolant Strategy: Ensure coolant concentration of 6–8% for emulsion. For MQL, apply 20–50 mL/hour at the cutting edge. High-pressure internal coolant (70–150 bar) is strongly recommended for stainless steel and deep-hole applications.
• Entry Conditions: Use constant feed engagement; avoid dwell at entry. For inclined surfaces >5°, use helical entry or spot-face to ensure stable initial contact.
• Exit Protocol: Reduce feed by 30% in the last 1×D of through-holes to prevent burr formation and breakout.
• Tool Change Criteria: Monitor flank wear (VB). Replace when VB = 0.3 mm or when surface finish degrades beyond Ra 1.6 μm. Do not re-sharpen PVD-coated tools.
• Storage: Store in original packaging at 15–25°C with <60% relative humidity. Avoid contact with other tools to prevent edge damage.

Toolholder Compatibility

Packaging & Ordering Information

• Packaging: Each SGS66425 is supplied in a premium cardboard sleeve with foam lining. The packaging includes a printed specification label with barcode, batch number, and manufacturing date.
• Minimum Order Quantity: 1 piece (no MOQ for standard items).
• Order Code: SGS66425 (also searchable as Kyocera-5,5-TX-DRILL).
• Lead Time: Standard items ship within 24–48 hours of order confirmation.
• Certificate: Certificate of conformity available upon request for aerospace and medical orders.
• Custom Labeling: Private labeling and OEM packaging available for quantities exceeding 500 pieces.
• Warranty: 12-month manufacturer defect warranty from date of delivery.

Catalog Meta Data

Need application support? Our technical team can provide detailed cutting parameter recommendations, tool path optimization, and custom tooling quotations. Contact Kyotow.com support with your drawing and material specification for a free tooling audit.