Kyocera TKF12R050-S KW10 Cut-Off Insert

Product Overview

The Kyocera TKF12R050-S is a precision-engineered uncoated carbide indexable cut-off insert designed for small-parts machining and parting-off operations. Manufactured in Japan to stringent ISO standards, this KW10-grade insert delivers exceptional dimensional accuracy, clean cut-off surfaces, and extended edge life in high-volume CNC production environments.

Featuring a specialized S chipbreaker geometry and optimized cutting edge, the TKF12R050-S minimizes burr formation and reduces cutting forces during separation operations. The KW10 substrate provides the ideal balance of hardness and toughness for stable machining of non-ferrous alloys, cast iron, and titanium materials.

ISO Designation Breakdown

Engineering Dimensions & Geometry

Grade Details — Key Grade Characteristics

KW10 Grade Characteristics

The KW10 grade is a premium uncoated fine-grain tungsten carbide specifically developed by Kyocera for machining non-ferrous metals, cast iron, and titanium alloys. This grade combines high hardness with exceptional edge stability.

• Substrate: Ultra-fine grain tungsten carbide (WC) with cobalt binder optimized for cut-off, small parts machining applications
• Hardness: 92.0 HRA (approx. 1600 HV30) — provides excellent wear resistance at elevated cutting temperatures
• Transverse Rupture Strength: ≥2,800 MPa — resists chipping in interrupted cuts
• Grain Size: Sub-micron (0.5–0.8 μm) — ensures sharp cutting edges and superior surface finish
• Coating: Uncoated — ideal for materials where coating adhesion is problematic (aluminum, copper, titanium)
• ISO Application Group: K10-K20 (cast iron, non-ferrous metals, non-metals, titanium alloys)
• Color Code: Natural carbide gray (uncoated) for easy grade identification

Key Performance Advantage: The absence of coating eliminates built-up edge (BUE) formation on aluminum and copper alloys, delivering mirror-finish surfaces without edge degradation. The fine-grain structure maintains edge sharpness even at low cutting speeds common in small-parts and micro-machining operations.

Grade Comparison Matrix

Note: KW10 is the optimal choice for uncoated applications requiring maximum surface finish and minimal built-up edge. For ferrous materials, consider PR905 or PR930 coated grades.

Chipbreaker Profile

Chipbreaker Profile Analysis

The S-profile chipbreaker is specifically engineered for small-parts machining and cut-off operations. Its sharp, narrow groove minimizes cutting forces and reduces burr formation at the parting point, critical for maintaining dimensional accuracy on miniature components.

• Chipbreaker Code: S
• Chip Control: Excellent — narrow groove breaks chips into short segments
• Feed Range: 0.05–0.25 mm/rev
• Depth of Cut: 0.5–5.0 mm
• Chip Form: 6-shaped / C-shaped segments

Recommended Applications & Workpiece Materials

Recommended Applications & Workpiece Materials

The TKF12R050-S KW10 is specifically engineered for the following material groups and application scenarios:

• Aluminum Alloys (1xxx–7xxx series): Excellent — produces clean, burr-free cut-off surfaces with minimal edge buildup
• Copper & Copper Alloys: Excellent — mirror-finish parting surfaces achievable due to uncoated edge preventing material adhesion
• Cast Iron (Gray & Ductile): Very Good — stable cutting with controlled chip formation; dry machining recommended
• Titanium Alloys (Ti-6Al-4V): Good — suitable for small-diameter parting; use reduced speeds to manage heat
• Brass & Bronze: Excellent — high-speed parting with extended tool life
• Plastics & Composites: Very Good — clean shearing action without material melting or delamination

Material Compatibility Note: This uncoated grade is NOT recommended for unhardened steels (>0.3% C) or stainless steels where crater wear and built-up edge will rapidly degrade tool life. For ferrous materials, select a PVD-coated grade such as PR905 or PR930.

Application Map by Operation

Recommended Cutting Conditions

Critical Cut-Off Note: Reduce feed rate by 50% when approaching the center of the workpiece to prevent insert breakage from increased cutting forces. Use a spindle speed override or constant surface speed (CSS) programming to maintain optimal cutting velocity.

Operating Guidelines

Operating Guidelines & Best Practices

• Toolholder Selection: Use only Kyocera-approved toolholders with matching insert pocket geometry. Incorrect holder selection will result in poor chip control and premature insert failure.
• Insert Seating: Ensure the insert seats fully in the pocket without rocking. Clean the pocket and seating surface before every insert change. Torque clamping screws to manufacturer specifications.
• Run-In Procedure: For new installations, run at 70% of recommended cutting speed for the first 5 minutes to allow the cutting edge to stabilize and micro-polish.
• Chip Evacuation: Direct coolant nozzles to flush chips out of the groove immediately. Chip recutting is the primary cause of poor surface finish and edge chipping.
• Vibration Control: Minimize tool overhang. Use the shortest possible toolholder and ensure workpiece rigidity. Vibration will destroy cutting edge integrity in micro-grooving and small-parts operations.
• Edge Inspection: Inspect the cutting edge under magnification (10× minimum) after each machining cycle. Replace the insert when flank wear exceeds 0.15 mm or when chipping is visible.
• Speed/Feed Adjustment: If built-up edge (BUE) forms on aluminum or copper, increase cutting speed by 20% or switch to high-pressure coolant delivery.
• Depth Limitations: Do not exceed recommended maximum groove depths. Deep grooves require multiple passes with incremental depth increases of 0.5–1.0 mm per pass.
• Parting-Off Protocol: Slow feed rate to 50% when within 2 mm of the centerline. Use spindle synchronization or CSS to prevent speed increase as diameter decreases. Support the falling part to prevent damage to the insert.

Toolholder Compatibility

Toolholder Compatibility & Mounting

The TKF12R050-S is compatible with Kyocera KTKF series cut-off holders and equivalent ISO-standard toolholders. Key compatibility requirements:

• Holder Series: KTKF (primary), KGMF (alternative for modified geometries)
• Insert Pocket: 12 mm thickness pocket with right-hand orientation
• Clamping: Top-clamp or wedge-lock depending on holder model
• Coolant Delivery: Through-tool coolant recommended; minimum 10 bar pressure
• Holder Overhang: Maximum 8× holder width for stable parting
• Compatible Sleeves: Not applicable — direct pocket mounting

Mounting Verification: Before first use, verify that the insert sits flush in the pocket with no visible gaps. Use a dial indicator to check cutting edge height relative to the toolholder reference surface. Edge height should be within ±0.02 mm of centerline for optimal performance.

Packaging & Ordering Information

Packaging & Ordering Information

• Standard Packaging: Individual insert in protective plastic blister pack; 10 inserts per sealed plastic container
• Labeling: Each container includes ISO designation, grade, batch number, and manufacturing date code
• Minimum Order Quantity: 1 insert (bulk pricing available for quantities ≥50)
• Stock Availability: Standard stock item; typically ships within 24 hours of order confirmation
• Storage Recommendation: Store in original packaging at 15–25°C in a dry environment; avoid exposure to corrosive atmospheres
• Country of Origin: Japan (manufactured at Kyocera Precision Tools facility)
• Certification: ISO 9001:2015 quality management; inserts traceable to production batch
• Warranty: Full manufacturer warranty against material and manufacturing defects

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