Carbide drill bits

KERNVEX External Cooling 2 Flutes Drills

Range reference: KVX-001

workpiece material: Soft steel; Hardened and tempered steel; Tempering stainless steel; Cast iron; Bearing steel; Deep hole working
application type: Drilling
Coating: Self development comparable to DR coating

• Material: MG-grade carbide rods,ultra-fine grain size 0.8um，10% Coblat • Coating: Self-develped coating (benchmarking B-a-l-z-a-s DR Coating) • Coating hardness: 2000-4000HV • Ultra-low friction coefficient:0.05-0.15 • Helix angle: 30° • Point angle:138.9° • Large rake angle: 16° • Negative chamfer: -6° • Variable core thickness: 30–40% • Variable outer diameter: 0.8°

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Technical data

Product Name	External Coolant Drill Bit
Material	Solid carbide
Process	Fully Gorund (Roll Forged & Polished, Roll Forged, Milled are Available)
Size	Standard size or as request
Point Type	118 Degree Regular Point (1-3mm); 138 Degree Split Point(3-20mm)
Shank Type	Straight Shank (Tree Flats Shank, 1/2" Shank Sliver & Deming, Reduced Shank,1/4" Quick Change Hex Shank are Available)
Surface Finish	Amber Color (Bright, Black Oxide, Titanium, Black & Gold, are Available)
Package	Plastic Box or as request

Additional technical data

Product Code	Blade diameter	Blade Length H			Full L			Shank D
Product Code	Blade diameter	3XD	5XD	8XD	3XD	5XD	8XD	3XD	5XD	8XD
EXWL00400	4	24	36	43	66	74	81	6	6	6
EXWL00450	4.5	24	36	43	66	74	81	6	6	6
EXWL00500	5	28	44	57	66	82	95	6	6	6
EXWL00550	5.5	28	44	57	66	82	95	6	6	6
EXWL00600	6	28	44	57	66	82	95	6	6	6
EXWL00650	6.5	34	53	76	79	91	114	8	8	8
EXWL00700	7	34	53	76	79	91	114	8	8	8
EXWL00750	7.5	41	53	76	79	91	116	8	8	8
EXWL00800	8	41	53	76	79	91	116	8	8	8
EXWL00850	8.5	47	61	95	89	103	142	10	10	10
EXWL00P00	9	47	61	95	89	103	142	10	10	10
EXWL00950	9.5	47	61	95	89	103	142	10	10	10
EXWL01000	10	47	61	95	89	103	142	10	10	10
EXWL01050	10.5	55	71	114	102	118	162	12	12	12
EXWL01100	11	55	71	114	102	118	162	12	12	12
EXWL01150	11.5	55	71	114	102	118	162	12	12	12
EXWL01200	12	55	71	114	102	118	162	12	12	12
EXWL01250	12.5	60	77	133	107	124	178	14	14	14
EXWL01300	13	60	77	133	107	124	178	14	14	14
EXWL01350	13.5	60	77	133	107	124	178	14	14	14
EXWL01400	14	60	77	133	107	124	178	14	14	14
EXWL01450	14.5	65	83	152	115	133	204	16	16	16
EXWL01500	15	65	83	152	115	133	204	16	16	16
EXWL01550	15.5	65	83	152	115	133	204	16	16	16
EXWL01800	16	65	83	152	115	133	204	16	16	16
EXWL01850	16.5	73	93	171	123	143	223	18	18	18
EXWL01700	17	73	93	171	123	143	223	18	18	18
EXWL01750	17.5	73	93	171	123	143	223	18	18	18
EXWL01800	18	73	93	171	123	143	223	18	18	18
EXWL01850	18.5	79	101		131	153		20	20	20
EXWL01900	19	79	101		131	153		20	20	20
EXWL01950	19.5	79	101		131	153		20	20	20
EXWL02000	20	79	101		131	153		20	20	20

Technical notes

This external coolant solid carbide drill is designed for stable and efficient drilling in steel and general metal applications.
Ideal for ≤ 3×D drilling , standard CNC machines, and applications without internal coolant supply.
1. Premium Carbide Substrate
• Manufactured from imported MG-grade carbide rods
• Ultra-fine grain size: 0.8 μm
• 10% cobalt content for excellent toughness and wear resistance
• Suitable for high-speed and stable drilling in steel materials
This substrate provides a good balance between hardness and toughness, ensuring consistent performance under general machining conditions.
(Benchmarking Balzers DR Coating)
• Independently developed coating with in-house coating equipment
• Optimized for steel and general-purpose drilling
• Coating hardness: 2000–4000 HV
• Low friction coefficient: 0.05–0.15
• Effectively reduces:
• Built-up edge
• Surface scratching
The coating ensures smooth chip flow and extended tool life in continuous production.
3. Optimized Drill Geometry for External Coolant
• Point angle: 138.9°
• Double cutting edge design improves:
• Cutting stability
• Wear resistance
• Equalized web design reduces drill wandering and improves hole accuracy
• Optimized for external coolant or dry-assisted machining
This geometry provides reliable performance in standard drilling operations.
4. Efficient Flute & Core Design
This design improves cutting smoothness and chip evacuation, especially in shallow and medium-depth holes.
5. Application Materials
Suitable for drilling:
• Quenched and tempered steel
• Quenched and tempered stainless steel
• Bearing steel
Recommended for general-purpose drilling and standard production environments .
To ensure stable performance, long tool life, and consistent quality, every external coolant carbide drill is produced under a fully controlled manufacturing and inspection system.
Precision Edge Preparation Technology
• Drill tips are manually edge-honed and chamfered to improve edge strength and reduce micro-chipping
• Final edge preparation completed by fully automatic passivation equipment
• Rubber-bonded diamond abrasive polishing process ensures uniform edge radius on all cutting edges
• Edge passivation tolerance strictly controlled within ±0.003 mm
• Optimized edge preparation improves:
• Tool life in continuous production
Advanced Manufacturing Equipment
• High-precision grinding ensures:
• Accurate drill geometry
• Sharp and consistent cutting edges
• Smooth and stable drilling performance
• In-house grinding capability allows flexible production and OEM customization
Strict Quality Inspection & Control
• Profile accuracy and corner radius controlled within 3 μm
• 100% visual inspection at 300× magnification
• No edge chipping
• No serrations
• No surface defects
• In-house coating machines ensure full control over:
• Coating thickness consistency
• Adhesion reliability
• Batch-to-batch stability
• Integrated inspection system guarantees consistent quality from raw material to finished product
Helix angle: 30°
Large rake angle: 16°
Negative chamfer: -6°
Variable core thickness: 30–40%
Variable outer diameter: 0.8°