HRC65 8D Solid Carbide Drill with Internal Coolant 19–20 mm carbide end milll
High Hardness Deep Hole Drill Bit 17.0–18.9mm carbide end milll
HRC65 8D Solid Carbide Drill with Internal Coolant 15–16.9mm carbide end milll
HRC65 8D Internal Coolant Solid Carbide Drill 13.0–14.9mm carbide end milll
8D HRC65 Internal Coolant Solid Carbide Drill 11.0–12.9mm carbide end milll
HRC65 8D Internal Coolant Solid Carbide Drill Bit – 9.0–10.9mm carbide end milll
HRC65 8D Internal Coolant Solid Carbide Drill Bit – 7.0–8.9mm carbide end milll
HRC65 8D Internal Coolant Solid Carbide Drill | 5.0–6.9mm carbide end milll
HRC65 8D Internal Coolant Solid Carbide Drill | 2.0–4.9mm carbide end milll
BEYOND Solid Carbide 8D Drill · HRC65 · KCPK15 Coated
HRC65 8D Internal Coolant Drill — Hardened Steel & Die Steel
The flagship BEYOND HRC65 8D drill for heavy deep-hole drilling in hardened steel up to HRC65, die steel, stainless, and high-temperature alloys. KCPK15 TiAlN-based coating tolerates 50–80 m/min cutting speed with internal coolant at 15–30 bar pressure.
🟢 Trusted by small workshops, individual machinists & garage CNC users worldwide. 1 piece welcome · WhatsApp reply within 2 hours · 3–7 day global shipping via DHL / UPS / FedEx.
Flute Length
8 × D
Hardness Tier
HRC65
Diameter Range
2 – 20 mm
Coolant Pressure
15 – 30 bar
BEYOND HRC65 8D Family — 9 Diameter Tiers
All diameter tiers share the same 8D flute length ratio, HRC65 substrate, KCPK15 TiAlN-based coating, and through-coolant DIN 69090-3 shank. Diameter tier determines price, rigidity, and required coolant pressure.
| Diameter Tier | Flute Length | Coolant Pressure | Typical Use |
|---|---|---|---|
| 2.0–4.9 mm | 8×Ø | 15–18 bar | Micro deep hole — instrument, micro mold cooling |
| 5.0–6.9 mm | 8×Ø | 15–20 bar | Precision deep hole — medical, mold cooling |
| 7.0–8.9 mm | 8×Ø | 18–22 bar | Mid deep hole — aerospace brackets, valve |
| 9.0–10.9 mm | 8×Ø | 20–24 bar | Heavy deep hole — mold ejector, hydraulic |
| 11.0–12.9 mm | 8×Ø | 22–26 bar | Industrial deep hole — large mold, transmission |
| 13.0–14.9 mm | 8×Ø | 24–28 bar | Heavy industrial — large mold core |
| 15.0–16.9 mm | 8×Ø | 26–30 bar | Heavy industrial — mold base / die set |
| 17.0–18.9 mm | 8×Ø | 28–30 bar | Extreme deep hole — large mold |
| 19.0–20.0 mm | 8×Ø | 30 bar | Extreme deep hole — large structural / die |
Why 8×D — Heavy Deep-Hole Drilling
8×D (8×Ø) is the heavy deep-hole length for mold ejector pin channels, valve body cavities, and structural components where standard 3D / 5D drills cannot reach. To run reliably at 8D, you need: HRC65 substrate + KCPK15 coating, internal coolant at 15–30 bar, hydraulic / shrink-fit chuck, and a dedicated peck cycle.
| Depth | Coolant | Holder | Peck Cycle |
|---|---|---|---|
| 3×D | 7–15 bar through-coolant | ER collet (sealed) or hydraulic | 1×Ø retract OK |
| 5×D | 10–20 bar through-coolant | Hydraulic or shrink-fit | 0.5–1.0×Ø retract |
| 8×D (this series) | 15–30 bar through-coolant | Hydraulic or shrink-fit only | 0.2–0.3×Ø retract + dedicated cycle |
| 12D+ Saber | 20–40 bar through-coolant | Hydraulic or shrink-fit only | 0.1–0.2×Ø + coolant-pulse cycle |
For depth > 8×D, see the BEYOND 12D Saber Tooth family.
HRC65 Substrate + KCPK15 TiAlN Coating
The BEYOND HRC65 8D series uses HRC65-grade ultra-fine grain carbide substrate (10% cobalt binder) with KCPK15 TiAlN-based composite coating (~3 µm thickness). The KCPK15 coating maintains thermal hardness above 80% at 800°C — the key to surviving HRC65 work at 50–80 m/min Vc with 15–30 bar through-coolant.
| Property | KCPK15 (this series) | Standard TiAlN |
|---|---|---|
| Max operating temp | 900°C (with coolant) | 800°C |
| HRC65 endurance | Excellent (50–80 m/min Vc) | Limited (max 50 m/min) |
| MQL compatibility | Yes (with through-coolant backup) | Limited |
| Thickness | 3 µm composite | 2–4 µm single-layer |
Internal Coolant at 15–30 Bar — DIN 69090-3 Standard
8×D deep-hole drilling on hardened steel requires much higher coolant pressure than 3D / 5D drilling. The HRC65 8D series uses DIN 69090-3 D-Type shank with sealed internal coolant channels, requiring 15–30 bar pressure at the cutting edge.
Compatible holders:
- Hydraulic chuck with sealed coolant supply (best for 8D drilling)
- Shrink-fit chuck with sealed holder (premium rigidity)
- ER collet chuck (DIN 6499 / ISO 15488) with sealed nut — see ER collet chucks
⚠ Critical: Standard ER collets without sealed nut will leak coolant at 15+ bar. For 8D HRC65 work, use hydraulic chuck (preferred) or shrink-fit chuck — never 3-jaw chuck. Runout < 0.005 mm at the drill point.
Cutting Parameter Quick Guide
Starting recommendations for the BEYOND HRC65 8D series. KCPK15 coating + internal coolant mandatory.
| Material | Hardness | Vc (m/min) | Feed f (mm/rev) | Coolant |
|---|---|---|---|---|
| Hardened Steel (HRC55–60) | HRC60 | 60–90 | 0.06–0.14 | 15–20 bar |
| Hardened Steel (HRC60–65) | HRC65 | 50–80 | 0.04–0.10 | 20–25 bar |
| Die Steel (HRC58–62) | HRC60 | 40–70 | 0.04–0.10 | 20–25 bar |
| Stainless Steel (SUS304–SUS420) | HRC60 | 40–70 | 0.06–0.12 | 20–25 bar |
| High-Temp Alloy (Inconel / Ti) | HRC60 | 20–40 | 0.03–0.08 | 25–30 bar |
For Individual Buyers & Small Workshops
You don't need to be a factory buyer. We ship 1 piece to your home, garage, or workshop — no MOQ, no pre-approval, no corporate paperwork.
💰 Volume Discounts (auto at checkout)
- 1 piece — list price
- 2–9 pieces — 6% OFF
- 10+ pieces — 12% OFF
📦 Shipping & Delivery
- Shipped from Hangzhou, China
- DHL / UPS / FedEx — 3–7 days to most countries
- Tracked & insured; signature on delivery
💬 Pre-Sale Technical Support
- WhatsApp reply within 2 hours (workdays)
- Email reply same business day
- Chinese & English supported
🎓 Perfect For
- Garage CNC / hobby machinists (small jobs)
- Engineering students & capstone projects
- Small prototype & R&D shops
- Repair & one-off die / mold shops
Not sure which diameter to pick? Send us your workpiece photo + material on WhatsApp — we'll recommend a size within 2 hours.
Solid 8D vs Indexable Insert 8D / 12D Saber
Solid carbide HRC65 8D (this collection) wins on rigidity and small-diameter precision (≤ Ø 20 mm). For ≥ Ø 20 mm or > 8D depth, switch to the 12D Saber Tooth or indexable insert family. All 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
Mold Ejector Pin Channels
HRC60 die steel deep ejector channels Ø 6–12 mm at 50–100 mm. HRC65 8D is the workhorse choice.
Die Set Cooling Lines
Hardened die steel Ø 8–16 mm at 100+ mm. Pair with face mill for top cleanup.
Valve Body Deep Cavities
316 stainless hardened valve cavities Ø 6–14 mm. KCPK15 + 20 bar coolant mandatory.
Aerospace Hardened Bracket
HRC60 titanium / Inconel brackets Ø 4–10 mm at 50+ mm. Reduce Vc by 50% for Ti / Inconel.
Medical Implant Pass
316L hardened medical implant Ø 2–4 mm at 30+ mm. Mirror-grade finish required.
Long Reach >8D
Beyond 8×D depth, switch to 12D Saber Tooth with 20–40 bar coolant + dedicated cycle.
Ordering Guide by Diameter Tier
| Diameter | Coolant Pressure | Notes |
|---|---|---|
| 2.0–4.9 mm | 15–18 bar | Micro deep hole — frequent peck 0.2×Ø |
| 5.0–6.9 mm | 15–20 bar | Mold cooling, medical implant |
| 7.0–8.9 mm | 18–22 bar | Aerospace, valve bodies |
| 9.0–10.9 mm | 20–24 bar | Mold ejector, hydraulic |
| 11.0–12.9 mm | 22–26 bar | Industrial deep hole |
| 13.0–14.9 mm | 24–28 bar | Heavy industrial — large mold core |
| 15.0–16.9 mm | 26–30 bar | Heavy industrial — mold base |
| 17.0–18.9 mm | 28–30 bar | Extreme deep hole |
| 19.0–20.0 mm | 30 bar | Extreme deep hole — hydraulic chuck mandatory |
| > 20 mm | Switch to WC 5D indexable or 12D Saber | Insert economics beat solid carbide ≥ Ø20 mm |
Frequently Asked Questions
Why HRC65 specifically, and how is it different from HRC60?
HRC65 substrate is the heavy-duty grade for workpieces up to HRC65 hardness — pre-hardened die steel, hardened stainless, and high-temperature alloys. Standard HRC60 drills wear fast above HRC60. The HRC65 8D series uses higher cobalt binder (10%) and KCPK15 coating to survive 50–80 m/min Vc on HRC60–65 work.
What holder / chuck do I need for 8D HRC65 work?
For Ø ≤ 6 mm: hydraulic chuck (best) or shrink-fit chuck. For Ø 7+ mm: hydraulic or shrink-fit only — never 3-jaw chuck (runout will break the drill). All holders must have sealed coolant supply. See ER collet chucks for sealed-nut options. Runout must be < 0.005 mm at the drill point.
Can the HRC65 8D drill run on Inconel or titanium?
Yes — but reduce Vc by 50% vs steel. For Inconel 718/625: Vc 20–40 m/min, f 0.04–0.10 mm/rev, 25–30 bar coolant. For titanium 6Al-4V: Vc 30–50 m/min, f 0.06–0.12 mm/rev, 25 bar coolant. KCPK15 coating is mandatory for both.
📦 Do you ship to my country? How fast?
Yes — we ship globally from Hangzhou, China via DHL / UPS / FedEx. Standard transit is 3–7 business days to most countries in North America, Europe, Asia-Pacific, and the Middle East. Shipping cost is calculated at checkout based on weight and destination; tracking number is emailed within 24 hours of dispatch.
🛒 Can I order just 1 piece? Is there a minimum order?
Yes — no MOQ. Order 1 piece at list price, 2–9 pieces at 6% OFF (auto-discount at checkout), 10+ pieces at 12% OFF. Whether you're a hobby machinist with one die to repair or a manufacturer with 500, you're welcome.
↩️ What's your return / refund policy?
Unopened, unused stock can be returned within 7 days of delivery for a full refund (buyer pays return shipping). Defective or wrong items are replaced at our cost. WhatsApp us with your order number and a photo — we respond within 2 hours on workdays.
Need a Custom HRC65 Drill Spec or Bulk Quote?
BEYOND engineers respond same-day for hardened steel drill specs, custom diameters, 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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