8D · Carbide Coolant-Thru Drill · ø4.00mm
ø4.00 mm 8D Solid Carbide
Coolant-Thru Drill
The 8D ratio tackles deep-hole applications where chip evacuation and heat build-up are the primary failure modes. Internal coolant channels maintain cutting temperature and flush chips continuously, enabling consistent hole quality in steel, stainless, and ductile iron at depths where standard drills fail.
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Reference price
$18.02
Ref. factory price (USD)
Based on rod stock cost as of 2026-03-31. Final quotation may differ.
ø4.00mm 8D Coolant Drill
SKU: SCD-CTD-8D-D400
✓ Factory direct pricing
✓ MOQ 1 piece, stock sizes ship 1–5 days
✓ Custom lengths & diameters available
Full Dimensions
Technical Specifications
| Cutter Diameter (D1 h7) | ø4.00 mm |
| Imperial Equivalent | 0.1575" |
| Flute Length (L2) | 42.00 mm |
| Shank Diameter (D2 h6) | ø4.00 mm |
| Overall Length (L1) | 75.00 mm |
| Depth Ratio | 8D (8× diameter) |
| Point Angle | 140° |
| Helix Angle | 30° |
| Number of Flutes | 2 |
| Coating | TiAlN / TiSiN Oerlikon Balzers BALINIT® |
| Substrate | K10/K20 Solid Carbide 10% Co binder |
| Coolant | Internal twin-channel |
| Tolerance | DIN 1414 · ISO 5419 |
| MOQ | 1 piece |
| Lead Time (standard) | 1–5 business days |
| Lead Time (custom) | 5–15 business days |
8D Dimensional Drawing
Where This Tool Excels
ø4.00mm 8D — recommended applications
- ▸ Precision electronics housings
- ▸ Medical device components
- ▸ Micro-feature aerospace parts
- ▸ Watch and optical instrument parts
Material Compatibility
Recommended Work Materials
8×D Deep-Hole Coolant-Thru Drill
Deep hole — steel, stainless, ductile iron, oil galleries
Same Diameter, Different Reach
ø4.00 mm Also Available In
Same Depth Ratio, Adjacent Sizes
Nearby 8D Diameters
Ready to Order ø4.00mm 8D Coolant Drills?
Factory direct. MOQ 1 piece. Tell us quantity and delivery date — we'll confirm lead time and pricing within 4 business hours.