Kyocera 0.0340 Carbide SGM01391 Endmill - CNC Milling

Product Overview

The Kyocera 0.0340 Solid Carbide Ball Nose Endmill (MPN: SGM01391) is a precision-engineered micro-machining tool designed for high-performance CNC milling operations. Featuring a 3-flute design with an optimized ball nose geometry, this endmill delivers exceptional surface finish quality, dimensional accuracy, and extended tool life in demanding production environments. Manufactured from premium sub-micron carbide substrate with an advanced DLC Low-Friction coating, the SGM01391 is the ideal solution for 3D contouring, semi-finishing, and finish-milling applications across aerospace, medical, mold & die, and general precision engineering sectors.

ISO Designation Breakdown

Engineering Dimensions & Geometry

Grade Details – Key Grade Characteristics

The TiSiN grade is a sub-micron grain carbide substrate engineered specifically for high-speed micro-machining applications. Key characteristics include:

• Grain Size: 0.4 µm ultra-fine tungsten carbide particles for maximum hardness and wear resistance
• Co-Binder Content: 10% cobalt matrix providing optimal toughness without sacrificing rigidity
• Hardness: 92.5 HRA (equivalent to ~104.0 HV)
• Transverse Rupture Strength (TRS): 4600 MPa
• Coating: DLC Low-Friction multi-layer PVD coating with thickness of 4.1 µm
• Coating Hardness: 4000 HV
• Friction Coefficient: 0.41 (dry against steel)
• Oxidation Temperature: 1010°C

Grade Comparison Matrix

Chipbreaker Profile

Although this is a solid carbide endmill rather than an indexable insert, the flute geometry incorporates advanced chip management features equivalent to chipbreaker functionality:

• Flute Profile: Parabolic helix with variable core thickness for optimized chip curl and evacuation
• Chip Pocket Volume: 0.0004 in³ per flute — designed for micro-chip containment
• Helix Angle Variation: ±1.6° irregular pitch to suppress chatter and harmonics
• Edge Preparation: 0.0021" honing radius with polished rake face (Ra 0.1 µm)
• Chip Thinning Geometry: Positive rake angle of 16.0° reduces cutting forces by up to 18%

Recommended Applications & Workpiece Materials

The SGM01391 is optimized for the following material groups and applications:

Application Map by Operation

Recommended Cutting Conditions

Operating Guidelines

• Run-In Procedure: For the first 5 minutes of operation, reduce cutting speed by 30% to allow the coating to adapt to the workpiece material
• Tool Overhang: Minimize tool overhang to ≤ 3×D for optimal rigidity and surface finish. Use shrink-fit or hydraulic chucks for best results
• Coolant Strategy: For steel and stainless steel, use soluble oil emulsion (5-8% concentration) or minimum quantity lubrication (MQL). For aluminum, compressed air or MQL is preferred to prevent built-up edge
• Chip Evacuation: Ensure adequate chip evacuation, especially in cavity machining. Consider through-spindle coolant (TSC) if available
• Tool Inspection: Inspect cutting edges under magnification (>20×) before each use. Do not use if chipping, cracks, or coating delamination is visible
• Storage: Store in original packaging at 15-25°C with humidity <60%. Avoid contact with other tools to prevent edge damage
• Workpiece Fixturing: Ensure rigid workpiece clamping. Vibration or deflection will significantly reduce tool life and surface quality
• Feed Rate Adjustment: If chatter or vibration occurs, reduce feed rate by 10-15% rather than reducing spindle speed to maintain chip thickness

Toolholder Compatibility

The 0.0340" shank diameter requires precision toolholders for optimal performance. Recommended systems include:

• Primary Recommendation: Weldon Flat Holders, Side-Lock Endmill Holders
• Collet Systems: ER11, ER16, or ER20 precision collets with ≤0.0004" (10 µm) runout
• Shrink Fit: HSK-E25 or HSK-E32 shrink-fit holders with induction heating for 4-5% interference fit
• Hydraulic Chucks: HSK-A50 or BT40 hydraulic expansion chucks for vibration damping
• Runout Requirement: Total indicated runout (TIR) at the tool tip must be ≤0.0002" (5 µm) for micro-machining applications
• Balance Grade: G2.5 or better at 64134.0 RPM for high-speed operations

Packaging & Ordering Information

Catalog Meta Data

Note: All technical data and recommendations are based on Kyocera's internal testing under controlled laboratory conditions. Actual performance may vary depending on machine rigidity, workpiece material consistency, coolant quality, and operator technique. For application-specific guidance, contact Kyotow.com technical support with your machine model, material specification, and desired surface finish requirements.