Kyocera GER300-020B KW10 TWE16900 Grooving Insert - External Grooving

Product Overview

The Kyocera GER300-020B is a precision-engineered uncoated carbide indexable grooving insert designed for external groove generation on CNC turning centers. Manufactured in Japan to exacting ISO standards, this KW10-grade insert delivers superior surface finish quality, tight dimensional tolerances, and extended tool life in continuous and interrupted grooving operations.

Featuring optimized B chipbreaker geometry and a 0.008" nose radius, the GER300-020B ensures controlled chip formation and reduced cutting forces across a wide range of groove widths and depths. The KW10 uncoated carbide substrate is specifically formulated for stable machining of cast iron, aluminum alloys, copper, and titanium workpiece 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 grooving applications
• Hardness: 92.0 HRA (approx. 1600 HV30) — provides excellent wear resistance at elevated cutting temperatures
• Transverse Rupture Strength: ≥2,600 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 B-profile chipbreaker features a medium-land geometry with a shallow groove designed for general grooving applications. It provides balanced chip control across a wide feed range and ensures smooth chip evacuation in both continuous and lightly interrupted cuts.

• Chipbreaker Code: B
• Chip Control: Good — medium groove for general applications
• 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 GER300-020B KW10 is specifically engineered for the following material groups and application scenarios:

• Aluminum Alloys (1xxx–7xxx series): Excellent — external grooves for shafts, pulleys, and housings with mirror finish
• Cast Iron (Gray & Ductile): Very Good — external grooves for piston rings, seal seats, and retaining rings
• Copper & Copper Alloys: Excellent — groove generation on electrical contacts and busbars
• Titanium Alloys: Good — external grooves for aerospace and medical fasteners
• Brass & Bronze: Excellent — decorative and functional grooves on fittings and valves
• Plastics & Composites: Very Good — clean groove cutting without melting or fiber pull-out

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

External Grooving Note: For groove depths exceeding 3× the groove width, use a pecking cycle or stepped groove program to reduce cutting forces and prevent insert breakage. Maintain consistent coolant delivery to the cutting zone for optimal chip evacuation and surface finish.

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.

Toolholder Compatibility

Toolholder Compatibility & Mounting

The GER300-020B is compatible with Kyocera SIGE series external grooving holders and standard external grooving toolholders. Key compatibility requirements:

• Holder Series: SIGE (primary), GE (alternative pocket geometries)
• Insert Pocket: GE-style pocket with right-hand orientation
• Clamping: Top-clamp or lever-lock depending on holder model
• Coolant Delivery: External flood coolant or through-tool coolant (if holder equipped)
• Holder Overhang: Maximum 6× groove width for stable machining
• Compatible Systems: Standard CNC turning center turret systems with 20×20 mm or 25×25 mm shanks

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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