14-20mm HRC60 Internal Coolant Holes 5D carbide end milll
12-13.9mm HRC60 Internal Coolant Holes 5D carbide end milll
10-11.9mm HRC60 Internal Coolant Holes 5D carbide end milll
8.0-9.9mm HRC60 Internal Coolant Holes 5D carbide end milll
6.0-7.9mm HRC60 Internal Coolant Holes 5D carbide end milll
3.0-5.9mm HRC60 Internal Coolant Holes 5D carbide end milll
2.0-2.95mm Internal Coolant Holes HRC60 5D carbide end milll
BEYOND Solid Carbide 5D Drill · Internal Coolant · Through-Shank
HRC60 Internal Coolant 5D Carbide Drill Bit — Deep Hole, All Steel
The signature BEYOND HRC60 5D drill family with DIN 69090-3 through-coolant shank. Integrated coolant channels deliver high-pressure fluid directly to the cutting edge, enabling 5×D deep-hole drilling in stainless steel, hardened alloy, and titanium without chip welding or premature wear.
Flute Length
5 × D
Point Angle
140°
Diameter Range
2 – 20 mm
Coolant Pressure
7 – 15 bar
BEYOND Internal Coolant 5D Family — 7 Diameter Tiers
All diameter tiers share the same 5×D flute length ratio, 140° point angle, DIN 69090-3 through-coolant shank, and HRC60 carbide substrate. Diameter tier determines price, rigidity, and required coolant pressure.
| Diameter Tier | Flute Length | Coolant Pressure | Typical Use |
|---|---|---|---|
| 2.0–2.95 mm | 5×Ø | 7–10 bar | Micro deep hole — electronics, instrument, micro mold cooling |
| 3.0–5.9 mm | 5×Ø | 8–12 bar | Precision deep hole — medical implant, mold cooling channels |
| 6.0–7.9 mm | 5×Ø | 10–12 bar | Mid deep hole — aerospace brackets, valve bodies |
| 8.0–9.9 mm | 5×Ø | 11–13 bar | Heavy deep hole — mold ejector, hydraulic manifold |
| 10.0–11.9 mm | 5×Ø | 12–14 bar | Industrial deep hole — large mold, transmission |
| 12.0–13.9 mm | 5×Ø | 13–15 bar | Heavy industrial deep hole — large mold core |
| 14.0–20.0 mm | 5×Ø | 14–15 bar | Extreme deep hole — large injection mold, structural |
Through-Coolant vs External Coolant
For 5×D deep-hole drilling, external flood coolant is insufficient — chips clog the flutes before they can evacuate, cutting edge heat exceeds 600°C, and tool life collapses. Through-coolant (also called internal coolant or through-tool coolant) channels high-pressure fluid through sealed channels in the shank and drill body, delivering coolant directly to the cutting edge at 7–15 bar.
Through-Coolant (this series)
- 7–15 bar pressure at cutting edge
- Reduces edge temperature by up to 50%
- 2–5× longer tool life vs external
- Mandatory for ≥3×D depth on stainless / titanium
- Compatible with DIN 69090-3 sealed holders
External Coolant (Not Recommended)
- Chips clog at 3×D depth on steel
- Edge heat exceeds coating limit
- Drill breakage risk at depth
- OK for ≤2×D shallow holes only
DIN 69090-3 D-Type Shank Compatibility
All BEYOND HRC60 Internal Coolant 5D drills use the DIN 69090-3 D-Type shank — the standard for through-coolant drilling on machining centers. The shank has a sealed coolant channel that mates with sealed tool holders, maintaining pressure from the spindle through the drill body to the cutting edge.
Compatible holders:
- ER collet chuck (DIN 6499 / ISO 15488) with sealed nut — see ER collet chucks collection
- Hydraulic chuck with sealed coolant supply (best for Ø 6 mm+)
- Shrink-fit chuck with sealed holder (premium rigidity for heavy deep hole)
- Direct spindle with HSK / CAT sealed interface
⚠ Critical: Standard ER collets without sealed nut will leak coolant at the collet/nut interface. Use only sealed-nut ER collets or hydraulic chucks with through-coolant for the BEYOND Internal Coolant 5D series.
Cutting Parameter Quick Guide
Starting recommendations for the BEYOND HRC60 Internal Coolant 5D series. Through-coolant is mandatory.
| Material | Hardness | Vc (m/min) | Feed f (mm/rev) | Coolant |
|---|---|---|---|---|
| Carbon Steel (≤1500 N/mm²) | HRC60 | 80–120 | 0.10–0.24 | 10–15 bar |
| Alloy Steel / Tool Steel | HRC55 | 30–60 | 0.06–0.16 | 12–15 bar |
| Stainless Steel (SUS304–SUS420) | HRC60 | 40–80 | 0.08–0.18 | 12–15 bar |
| Titanium 6Al-4V | HRC60 | 30–50 | 0.06–0.12 | 15 bar |
| Hardened Steel (≤HRC65) | HRC65 | 50–80 | 0.04–0.10 | 15 bar |
5D Deep Hole Protocol
- Through-coolant mandatory — 7–15 bar pressure at the cutting edge (DIN 69090-3 sealed holder required).
- Peck cycle — retract every 0.5–1.0×Ø to evacuate chips. For Ø 5 mm, retract every 2.5–5 mm.
- Tool rigidity — use hydraulic or shrink-fit chucks for Ø 6 mm+; runout < 0.005 mm.
- Ramp-in feed — start at 50% of target feed for the first 1 mm of engagement.
- Wear inspection — every 50 holes for Ø < 5 mm, every 200 for Ø > 10 mm.
Solid 5D vs Indexable Insert 5D Drills
Solid carbide internal-coolant 5D (this collection) wins on rigidity and small-diameter precision (≤ Ø 20 mm). When hole diameter exceeds 20 mm or you need indexable economics, switch to the indexable insert drill family below. All eight siblings share the same /collections/drill parent hub.
SP Insert Drills — 55° positive trigon (stainless / aluminum / mild steel)
WC Insert Drills — 80° trigon negative rake (steel / cast iron / high MRR)
Application Spotlight
Deep Mold Cooling Channels
Large injection mold cooling lines Ø 5–10 mm at 80+ mm depth. Mandatory through-coolant prevents chip welding.
Aerospace Titanium Brackets
Titanium 6Al-4V deep holes Ø 3–6 mm at 50 mm. Vc 30–50 m/min, 15 bar coolant mandatory.
Stainless Valve Bodies
316 stainless deep cavities Ø 6–12 mm at 60–100 mm. Through-coolant essential to prevent work hardening.
Hydraulic Manifold Blocks
Steel/cast iron manifolds Ø 6–14 mm at 80–100 mm. Pair with corn mill for cross-hole.
Medical Implant Pass
316L spinal / dental implants Ø 2–4 mm at 30+ mm. Mirror-grade finish, zero chip welding.
Long Reach >5D
Beyond 5×D depth, switch to 12D Saber Tooth with internal coolant + dedicated peck cycle.
Ordering Guide by Diameter Tier
| Diameter | Coolant Pressure | Notes |
|---|---|---|
| 2.0–2.95 mm | 7–10 bar | Micro deep hole — frequent peck 0.3×Ø |
| 3.0–5.9 mm | 8–12 bar | Mold cooling, medical implant |
| 6.0–7.9 mm | 10–12 bar | Aerospace, valve bodies |
| 8.0–9.9 mm | 11–13 bar | Mold ejector, hydraulic |
| 10.0–11.9 mm | 12–14 bar | Industrial deep hole |
| 12.0–13.9 mm | 13–15 bar | Heavy industrial — large mold core |
| 14.0–20.0 mm | 14–15 bar | Extreme deep hole — hydraulic chuck mandatory |
| > 20 mm | Switch to WC 5D indexable | Insert economics beat solid carbide ≥ Ø20 mm |
Frequently Asked Questions
What's the difference between internal-coolant and external-coolant 5D drills?
The BEYOND HRC60 Internal Coolant 5D series has DIN 69090-3 sealed coolant channels in the shank and drill body, delivering high-pressure fluid directly to the cutting edge. External-coolant drills (e.g., the straight-shank HRC60 5D series without internal coolant) rely on flood coolant reaching the cutting edge from outside the flute — insufficient for ≥3D depth on stainless / titanium because chips clog before they can evacuate.
What holder / chuck do I need for the internal-coolant feature?
You need a DIN 69090-3 sealed holder — sealed-nut ER collet chuck (DIN 6499 / ISO 15488), hydraulic chuck with sealed coolant supply, or shrink-fit chuck with sealed holder. Standard ER collets without sealed nut will leak coolant at the collet/nut interface — defeating the purpose of the internal-coolant drill.
What coolant pressure is required?
For Ø 2–6 mm: 7–12 bar. For Ø 7–12 mm: 11–13 bar. For Ø 13–20 mm: 13–15 bar. Below 7 bar, chip evacuation breaks down; above 15 bar on small diameters, vibration increases. Always verify your machine's coolant system can deliver sustained pressure at the required flow rate.
Can the internal-coolant 5D run on stainless steel and titanium?
Yes — that's the primary use case. For stainless 304/316, Vc 40–80 m/min, f 0.08–0.18 mm/rev. For titanium 6Al-4V, Vc 30–50 m/min, f 0.06–0.12 mm/rev, 15 bar coolant mandatory. For Inconel 718/625, Vc 20–35 m/min, f 0.04–0.08 mm/rev. The internal-coolant channels prevent work-hardening and chip welding that plague external-coolant drills on these alloys.
How does the BEYOND Internal Coolant 5D compare to the straight-shank 5D drill?
The straight-shank HRC60 5D (no internal coolant) is sufficient for ≤3D shallow holes on carbon steel with flood coolant. The internal-coolant 5D (this collection) extends to 5×D depth and handles stainless / titanium / hardened steel where external coolant is insufficient. Tool life is typically 2–5× longer with internal coolant at the same cutting parameters.
Is the internal-coolant 5D available in custom lengths?
Standard 5D series comes in 120mm OAL. For longer reach (8D, 12D), see the BEYOND 12D Saber Tooth deep-hole drill family. For custom non-standard lengths (e.g., 8×D at 200mm), contact BEYOND engineering on WhatsApp for a quote.
Need Internal-Coolant Drill Specs or Holder Recommendation?
BEYOND engineers respond same-day for through-coolant drill specs, sealed holder pairings, and bulk pricing for 10+ pieces (12% off). Reach our team on WhatsApp or email — we ship from Hangzhou via DHL / UPS / FedEx with 3–7 day transit to most countries.
Chat on WhatsApp · +86 15990663752 Email · chao@cnchome-beyond.com
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