Kyocera 7.7 TA SGS68347 2FL Drill - Precision CNC Drilling

Product Overview

The Kyocera 7.7mm TA SGS68347 is a premium solid carbide 2-flute drill engineered for general engineering applications. Built on a ultra-fine 0.5μm carbide substrate and finished with a AlTiN-based nano-composite coating, this tool achieves exceptional hole quality, dimensional stability, and extended edge life in demanding CNC environments. Designed for through-hole and blind-hole operations, it delivers consistent performance across high-volume production cycles.

ISO Designation Breakdown

Engineering Dimensions & Geometry

Grade Details — Key Grade Characteristics

The TA grade is a high-performance carbide classification developed by Kyocera for medium-to-high speed drilling in stable machining conditions. Key characteristics include:

• Hardness: 1,650 HV30 — maintains edge integrity at elevated cutting temperatures
• Transverse Rupture Strength: 3,800 MPa — resists chipping in interrupted cuts
• Coef. of Thermal Expansion: 5.2 × 10⁻⁶ /°C — dimensional stability during thermal cycling
• Oxidation Threshold: 850°C — extends usable speed range
• Coating Adhesion: HF1 (Rockwell C) — prevents delamination under cyclic loading

Grade Comparison Matrix

Chipbreaker Profile

The 7.7mm TA drill features a polished flute surface with optimized chipbreaker geometry. The 2-flute design produces two equal chip streams that evacuate efficiently through helical flutes. Key profile attributes:

• Flute Form: Parabolic gash with polished rake face (γ₀ = 12°–14°)
• Chipbreaker Width: 0.15 × D — promotes curling without fragmentation
• Margin Width: 0.12 mm — stabilizes drill in bushing or pilot hole
• Web Thinning: S-point geometry reduces thrust force by 18–22%
• Surface Finish: Ra 0.2 μm flute surface minimizes built-up edge on stainless steels

Recommended Applications & Workpiece Materials

Application Map by Operation

Recommended Cutting Conditions

Values below are starting recommendations for external coolant in stable setups. Adjust based on machine rigidity and workpiece fixturing.

Operating Guidelines

• Runout: Maintain TIR < 0.01 mm at the tool tip; excessive runout accelerates corner wear
• Peck Cycle: For depths > 2.5×D, use peck depth of 0.5–1.0×D with full retract to break chips
• Coolant: Flood coolant at 6–8% concentration for steels; through-spindle coolant (70+ bar) preferred for >3×D holes
• Entry Angle: Use chamfer or center drill (90°) to prevent burr formation and ensure stable entry
• Feed Rate: Reduce feed by 30% at hole entry and 50% at breakthrough to minimize burr
• Tool Life Check: Monitor flank wear (VB); regrind or replace when VB > 0.15 mm or when hole tolerance degrades
• Storage: Keep in original packaging until use; avoid contact between carbide edges to prevent micro-chipping

Toolholder Compatibility

Packaging & Ordering Information

• Packaging: Individual plastic tube with protective wax tip; 10 pcs per inner box; 100 pcs per master carton
• Labeling: Each tube marked with Kyocera hologram, diameter, grade, MPN, and batch code for full traceability
• Minimum Order: 1 piece (no MOQ for standard catalog items)
• Lead Time: Stock items ship within 24–48 hours; non-stock items typically 2–3 weeks
• Unit Price: $135.9 per piece (volume discounts available for 50+ and 200+ quantities)
• HS Code: 8207.50.00 — Interchangeable tools for rock drilling or earth boring tools

Catalog Meta Data

Note: All technical data and recommendations are based on Kyocera laboratory testing under controlled conditions. Actual performance may vary depending on machine condition, workpiece material variability, coolant quality, and setup rigidity. Always conduct test cuts before full production implementation.