Deep-hole drill Drilling Inserts
Zhuzhou Kingdon Industrial & Commercial Co., Ltd (ZZKD) – Established 2004, Zhuzhou Hunan (tungsten/molybdenum hub), 10,000 m² plant, 30+ yr-experience engineers, supplying carbide and hardmetal solutions to USA, UK, Germany, Japan, Singapore, India etc.
What Makes Deep-hole Drilling Different from Standard Drilling
Deep-hole drilling (typically depth-to-diameter ratios exceeding 5:1 or 10:1) operates under extreme thermal and mechanical stress. The cutting zone is enclosed, making chip evacuation and cooling the primary failure points . Kingdon's deep-hole drill inserts are built around four non-negotiables: aggressive chip-splitting geometry, high-pressure coolant compatibility, high-toughness substrates, and precise guide pad integration.
Product Series & Parameter Integration
We cover LNMT / EOMT / MOGT style insert bodies, perfectly matching standard global deep-hole drill bodies (Gun drill, BTA, and indexable drill systems).
- LNMT2508: ØI.C 8.00 mm, T 4.50 mm, Φd 4.30 mm, Neutral (N) angle, double-sided economical design for general deep-hole roughing.
- EOMT08T308-MC / EOMT08T308-MI: ØI.C 9.87 mm, T 3.97 mm, Φd 2.90 mm, 17° angle, Re 0.8. MC (Medium Cut) and MI (Intermediate) chipbreakers for controlled evacuation in steel and stainless.
- MOGT09T308-HP: ØI.C 9.00 mm, T 3.97 mm, Φd 2.90 mm, 11° angle, Re 0.8. HP (High Performance) geometry designed for high feed rates and excellent hole straightness.
- Substrates & Coatings: Fine-grain PVD TiAlN/TiCN for stainless steel and alloy drilling; tough CVD grades for high-temp alloys; polished options for non-ferrous materials.
Geometry Logic (not grade talk)
- Chip-Splitting Edges: Unlike standard drills that produce long, continuous ribbons, our EOMT and MOGT series feature multi-facet geometries that break chips into small, manageable segments, preventing nest formation inside the bore .
- Coolant Channel Synergy: The insert geometry (including the specific Φd and thickness T) is designed to work seamlessly with high-pressure through-coolant holders (up to 100 bar), directing fluid exactly to the cutting edge to flush chips and reduce heat .
- Guide Pad Stability: For Gun drill and BTA applications, the insert's relief and angle ensure the guide pads carry the radial load, keeping the drill on center and ensuring bore straightness (±0.02mm/100mm) .
- Toughness vs. Wear Resistance: Deep holes expose the insert to cyclic shock at entry/exit. ZZKD grades prioritize substrate toughness to prevent micro-chipping, especially in interrupted cuts or alloy materials.
Where They Go
Hydraulic cylinder barrels, injector nozzles, turbine shafts, aerospace landing gear struts, oil & gas drill collars, mold cooling channels, and medical bone screws. Ideal for 5–30×D deep-hole operations on specialized gun drill machines, BTA systems, and CNC lathes.
|
Type |
Dimensions(mm) |
||||
|
ØI.C |
T |
Фd |
Angle |
Re |
|
|
LNMT2508 |
8.00 |
4.50 |
4.30 |
N |
\ |
|
EOMT08T308-MC |
9.87 |
3.97 |
2.90 |
17 |
0.8 |
|
EOMT08T308-MI |
9.87 |
3.97 |
2.90 |
17 |
0.8 |
|
MOGT09T308-HP |
9.00 |
3.97 |
2.90 |
11 |
0.8 |
ZZKD B2B Terms
Substrate + PVD/CVD + edge-prep all in Zhuzhou plant; batch-level geometry check, not mixed trading stock.
OEM/ODM: laser mark, private box, mixed-series starter kits (LNMT + EOMT + MOGT) for distributor shelf.
Grade mapping: P-class PVD for steel deep holes, M-class for 304/316 stainless deep drilling, specialized tough grades for high-temp alloys.
Free 5-piece sample (one type × 3 materials) for deep-hole test; quote with FOB Zhuzhou/Shanghai and repeat-lot lead time.
Inquiry format: hole depth-to-diameter ratio / material / machine type (gun drill/BTA/CNC) → code + grade + holder match in 2 working days.
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