Product Overview

The Kyocera #31 PR SGS53031 is a premium solid carbide drill engineered for high-performance CNC machining operations. Featuring a 3-flute design with optimized flute geometry, this tool delivers exceptional hole quality, precise dimensional accuracy, and superior surface finish across a wide range of workpiece materials. The advanced PR grade substrate combined with optimized point geometry ensures reduced cutting forces, enhanced chip evacuation, and significantly extended tool life in demanding production environments.

ISO Designation Breakdown

Engineering Dimensions & Geometry

Grade Details - Key Grade Characteristics

The PR grade represents a significant advancement in carbide substrate technology, specifically developed for high-performance 3-flute drilling applications:

• Substrate Composition: Ultra-fine grain carbide (0.4μm particle size) with 10% cobalt binder for optimal hardness-toughness balance
• Coating Technology: Multi-layer PVD coating with TiAlN+TiSiN top layer providing exceptional heat resistance up to 950°C
• Hardness: 93.0 HRA (±0.5) ensuring superior wear resistance in continuous cutting operations
• Transverse Rupture Strength: 4,500 MPa for reliable performance under high mechanical loads
• Thermal Stability: Optimized for dry machining and minimal coolant applications
• Surface Finish: Mirror-polished flute surfaces reduce friction and prevent material adhesion

Grade Comparison Matrix

Chipbreaker Profile

The #31 series features an optimized chipbreaker geometry specifically designed for 3-flute drilling with enhanced stability:

• Primary Groove Width: 1.12 mm for controlled chip curling
• Land Width: 0.82 mm providing adequate support at cutting edge
• Rake Angle: 10° positive for reduced cutting forces and improved chip flow
• Chipbreaker Angle: 40° for effective chip division and evacuation
• Margin Design: Triple-margin configuration ensures superior hole straightness and surface finish
• Flute Profile: Optimized parabolic flute design maximizes core strength while maintaining efficient chip evacuation channels

Recommended Applications & Workpiece Materials

Application Map by Operation

Recommended Cutting Conditions

Operating Guidelines

• Spindle Runout: Maintain TIR ≤ 0.01 mm at tool tip for optimal hole quality and tool life
• Tool Overhang: Minimize overhang to 4×D or less; use hydraulic or shrink-fit holders for best results
• Peck Cycle: For holes deeper than 2×D, implement peck drilling with 1-1.5×D peck depth
• Coolant Pressure: When using internal coolant, maintain 70-100 bar pressure for effective chip evacuation
• Entry Angle: Ensure perpendicular entry (≤0.5° deviation) to prevent chipping and uneven wear
• Pre-Drilling: For cast iron and forged surfaces, consider a pilot hole or chamfer to protect the cutting edge
• Speed/Feed Ramp: Reduce feed by 30% for the first 1 mm of entry, then ramp to full parameters
• Tool Change Interval: Monitor flank wear; regrind or replace when VB > 0.3 mm to maintain dimensional accuracy

Toolholder Compatibility

Packaging & Ordering Information

• Individual Packaging: Each drill is supplied in a protective plastic tube with foam insert to prevent edge damage
• Label Information: Clear labeling includes MPN (SGS53031), diameter, grade, batch number, and manufacturing date
• Minimum Order Quantity: 1 piece (no minimum for standard items)
• Bulk Packaging: Available in quantities of 10, 50, or 100 pieces with volume pricing
• Storage Conditions: Store in original packaging at 15-25°C, humidity <60% RH to preserve coating integrity
• Shelf Life: 5 years from manufacturing date when stored under recommended conditions
• Traceability: Full batch traceability for quality assurance and warranty claims

Catalog Meta Data

Note: All technical specifications are provided for reference purposes. Actual performance may vary based on machine condition, workpiece material, setup rigidity, and coolant application. For application-specific recommendations, consult our technical support team.