Kyocera 7.6mm PR1535 SGS63073 3FL Carbide Drill - Steel Machining

Product Overview

The Kyocera 7.6mm 3FL Solid Carbide Drill (SGS63073) is a precision-engineered cutting tool designed for high-performance hole-making operations in demanding manufacturing environments. Manufactured in Japan to exacting ISO standards, this drill combines an advanced PR1535 substrate with optimized 3-flute geometry to deliver exceptional productivity, dimensional accuracy, and extended tool life across a broad spectrum of workpiece materials.

With a diameter of 7.6 mm, this tool is ideally suited for applications requiring high-precision holes with excellent surface integrity. The PR1535 grade features a multi-layer PVD coating that minimizes built-up edge, reduces friction, and provides superior heat resistance—enabling reliable performance in both wet and MQL machining environments.

ISO Designation Breakdown

Engineering Dimensions & Geometry

Grade Details - Key Grade Characteristics

The PR1535 grade represents Kyocera's advanced micro-grain carbide technology, engineered specifically for high-speed drilling in ferrous and non-ferrous materials. This grade integrates a sub-micron tungsten carbide substrate (grain size <0.5 μm) with a proprietary TiAlN-based PVD multi-layer coating system.

• Substrate Hardness: 1,620 HV ±30 – Exceptional wear resistance at elevated cutting temperatures
• Coating Composition: Multi-layer TiAlN + TiN PVD architecture, 3.0 ±0.3 μm total thickness
• Oxidation Resistance: Stable performance up to 900°C in dry cutting applications
• Coating Adhesion: HF1 rating (ISO 2640 Rockwell C indentation test) – Superior bond strength prevents flaking
• Surface Finish: Mirror-polished rake and flank surfaces (Ra <0.2 μm) to minimize built-up edge and improve chip flow
• Edge Preparation: Micro-honed T-land (0.03 mm × 20°) for enhanced edge stability without sacrificing sharpness

Grade Comparison Matrix

Chipbreaker Profile

Unlike traditional 2-flute drills, the 3-flute geometry of the SGS63073 provides superior chip division and evacuation—critical for deep-hole drilling and high-feed applications. The flute profile has been optimized through finite element analysis (FEA) and validated in live cutting trials.

• Flute Configuration: 3 unequal helical flutes with variable pitch to suppress regenerative chatter
• Rake Angle (γ): 12° positive rake on primary cutting edge for reduced cutting forces and improved chip curl
• Chipbreaker Geometry: Parallel land chipbreaker with 0.15 mm land width and 8° secondary relief
• Chip Curl Radius: Designed for conical chip formation (C-type chips in ISO 3685 classification) for reliable evacuation through the flutes
• Core Taper: Gradual web thinning toward the point (from 1.9 mm to 1.37 mm) to balance rigidity with point geometry efficiency
• Coolant Through Capability: Compatible with external coolant delivery; optimized flute gullet area ensures no chip packing at feeds up to 0.30 mm/rev in steel

Recommended Applications & Workpiece Materials

Application Map by Operation

Recommended Cutting Conditions

Note: Values are starting recommendations. Adjust based on machine rigidity, coolant delivery, and hole depth. For depths >3×D, reduce feed by 10–15%.

Operating Guidelines

• Tool Runout: Maintain total indicator runout (TIR) below 0.01 mm at the tool tip. Excessive runout causes uneven wear and premature corner breakdown.
• Coolant Strategy: Flood coolant is recommended with a minimum concentration of 6–8% soluble oil for steel. For cast iron, dry machining or minimum quantity lubrication (MQL) is acceptable.
• Peck Cycle: For holes deeper than 3×D, implement a peck drilling cycle with 1.5×D peck depth and full retract to break chips. For 5×D or deeper, reduce peck to 1.0×D.
• Entry Angle: When drilling on curved or angled surfaces, create a flat spot or chamfer (≥0.5 mm wide) to prevent drill walk and corner chipping.
• Feed Rate Consistency: Avoid feed interruptions during cutting. Momentary stops can cause work-hardening in stainless steel and adhesive wear in aluminum.
• Tool Change Criteria: Replace the drill when flank wear (VB) reaches 0.3 mm, or when hole diameter tolerance exceeds 75% of the specified limit—whichever occurs first.
• Storage: Store in original packaging away from direct sunlight and humidity. Carbide is brittle; avoid dropping or contacting hard surfaces.

Toolholder Compatibility

Packaging & Ordering Information

• Packaging: Each drill is individually packed in a protective plastic tube with foam insert to prevent edge damage during transit. Outer carton contains 10 units maximum.
• Minimum Order Quantity (MOQ): 1 piece. Volume discounts available for quantities of 10, 50, and 100+.
• Lead Time: In-stock items ship within 24–48 hours. Back-ordered items typically arrive within 5–7 business days.
• Unit Price: $81.2 USD per piece (ex-works, subject to applicable taxes).
• Catalog Number for Ordering: SGS63073 – Always verify diameter and grade before placing an order.
• Warranty: Genuine Kyocera product backed by manufacturer's standard warranty against material and manufacturing defects.

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