BEYOND SP C20-5D-SD16.5-SP06 Indexable U-Drill Body | 16.5mm 5D CNC Deep Hole Drill
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BEYOND SP C20-5D-SD16.5-SP06
16.5mm 5D Indexable U-Drill | Precision Blind Hole Boring Specialist
Industrial 16.5mm Deep Hole Boring Specialist
The BEYOND SP C20-5D-SD16.5-SP06 is a high-performance indexable insert drill engineered for extreme stability in deep hole boring. With a 16.5mm cutting diameter and a 5D depth ratio (82.5mm reach), this tool is the primary choice for blind hole machining. Featuring internal cooling and a high-efficiency spiral flute, it ensures rapid chip evacuation and superior surface finish on CNC lathes. This rapid drill is designed for high-feed operations in steel, alloy, and cast iron.
Decoding the Model: SP C20-5D-SD16.5-SP06
Metric & Imperial Technical Specifications
| Feature | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Drilling Diameter (SD) | 16.5 mm | 0.650" |
| Shank Diameter (C) | 20.0 mm | 0.787" |
| Max Drilling Depth (5D) | 82.5 mm | 3.248" |
| Equivalent Model | SP-C0.75-5D-SD0.650-SP06 | |
20CrMnTi Alloy & Advanced Spiral Flute Design
Premium Body Material: This U-drill CNC tool body is manufactured from 20CrMnTi alloy steel. Through vacuum quenching and specialized tempering, the body reaches a surface hardness of HRC 50-55. This ensures the indexable drill resists deformation under high-pressure deep hole drilling while maintaining a shock-absorbing core for interrupted cuts.
High-Performance U-Slot: The spiral flute is precision-ground with a wide-opening U-shape. This geometry, coupled with internal coolant holes, prevents chip clogging—a common failure in 5D deep hole boring. By optimizing the chip evacuation path, it significantly extends the life of your carbide inserts.
Recommended Cutting Parameters (16.5mm 5D)
Optimized for Steel (HB < 250). Please adjust based on your CNC machine's rigidity:
- Cutting Speed (Vc): 110 - 170 m/min
- Feed Rate (f): 0.05 - 0.12 mm/rev
- Rotation Speed (N): Calculated as $$N = \frac{Vc \times 1000}{\pi \times 16.5}$$
- Coolant Requirement: High-pressure internal cooling (Center water) is 100% required for 5D depth.
Beyond SP Series: Performance Analysis
- 4-edge SPMG square inserts offer superior economy (4 usable corners).
- Optimized for Blind Hole Machining (flatter hole bottom).
- Thicker core for maximum body rigidity in deep hole boring.
- Higher cutting resistance than WC drills; requires stable spindle power.
- Coolant pressure must be maintained for chip flushing at 82.5mm depth.
Need a compatible holder for the 20mm shank?
VIEW COMPATIBLE C20 SIDE-LOCK HOLDERSWhat Our Global Clients Say
"Flawless 5D Drilling"
"I was worried about wandering at 82mm depth, but the SP body is incredibly stiff. 16.5mm hole came out spot on."
- John D. (USA)
"Best for Blind Holes"
"The flat bottom it leaves is exactly what we need for our valve blocks. High quality finish."
- Klaus M. (Germany)
"Very fast shipping and the tool body is very well machined. BEYOND is reliable."
- Hiroshi S. (Japan)
"Internal cooling works like a charm. No chip nesting issues."
- Luca P. (Italy)
"Solid 16.5mm U-drill. Great value compared to big European brands."
- Andre B. (France)
Frequently Asked Questions
Q: Does this include the SPMG06 inserts?
A: No, this is the tool body only. It is compatible with SPMG060204 inserts.
Q: Can I use this for through holes?
A: Yes, though SP is optimized for blind hole machining. For through-holes, our WC series offers lower cutting resistance.
Q: What material can this drill?
A: With the right SPMG inserts, it can handle carbon steel, stainless steel, cast iron, and high-temp alloys.
Machinist Tip: SP vs. WC U-Drills
SP Series (Square Inserts): The best choice for Blind Holes. Square inserts (SPMG) provide a flatter hole bottom and have a thicker drill core for maximum rigidity in deep boring (5D).
WC Series (Trigon Inserts): Specifically designed for Through Holes. The 3-sided inserts (WCMX/WCMT) reduce cutting force, but the body core is thinner than the SP series.
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.