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.
Need Help With BEYOND Inserts?
Looking for a BEYOND equivalent, alternative grade, or sample catalog? Our CNC specialists have helped 50+ manufacturers in aerospace, automotive, and medical machining source the right tooling at 30–50% lower cost than OEM prices.
This BEYOND insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
Technical FAQ & Buying Guide
When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.
For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.
Check the product listing for the selling unit, pack quantity and included components. If it is unclear whether the price is per piece or per pack, or whether a tool body and inserts are sold separately, contact us before purchasing.
Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.
Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.
According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.