BEYOND SP C20-3D-SD16.5-SP06 Indexable U-Drill Body | 16.5mm 3D CNC Boring Drill
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BEYOND SP C20-3D-SD16.5-SP06
16.5mm 3D Heavy-Duty U-Drill | Precision Blind Hole Boring Specialist
Industrial-Grade 16.5mm Indexable Boring Solution
The BEYOND SP C20-3D-SD16.5-SP06 is a high-performance indexable insert drill engineered for maximum stability in CNC boring and deep hole operations. With a 16.5mm cutting diameter and a 3D depth ratio (49.5mm reach), this tool is the primary choice for blind hole machining. Featuring internal cooling and a precision-engineered spiral flute, it ensures rapid chip evacuation and superior surface finish in steel and stainless steel.
Decoding the Model: SP C20-3D-SD16.5-SP06
Metric & Imperial Technical Specifications
| Feature | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Drilling Diameter (SD) | 16.5 mm | 0.649" |
| Shank Diameter (C) | 20.0 mm | 0.787" |
| Max Drilling Depth (3D) | 49.5 mm | 1.948" |
| Equivalent Model | SP-C0.787-3D-SD0.649-SP06 | |
Forged 20CrMnTi Alloy & High-Efficiency Spiral Flutes
Industrial Build: This indexable drill body is forged from premium 20CrMnTi alloy steel and vacuum quenched (HRC 52-55). This core strength is critical for large diameter drilling stability and preventing tool deflection. The surface features a Black Oxide finish to resist corrosion and thermal wear.
Advanced Slot Design: The U-drill features an optimized spiral flute (U-groove) that creates a smooth pathway for chip removal. Integrated internal cooling holes allow high-pressure coolant to flush metal chips directly out of the cutting zone, essential for successful blind hole machining.
Recommended Cutting Parameters (16.5mm 3D)
Optimal settings for Carbon Steel and Alloy Steel. Adjust based on CNC rigidity:
Rotation Speed (N) = (Vc × 1000) / (π × 16.5)
Vc = Cutting Speed | π ≈ 3.14 | D = 16.5mm
- Cutting Speed (Vc): 130 - 210 m/min
- Feed Rate (f): 0.05 - 0.12 mm/rev
- Coolant: High-pressure internal cooling is mandatory for 16.5mm 3D depth.
Pair with a high-rigidity Side-Lock C20 Holder for zero vibration:
SHOP COMPATIBLE C20 TOOL HOLDERSVerified Global Reviews
"Solid 16.5mm Performance"
"Using this for blind holes in 4140 steel. The body is extremely rigid and chip evacuation is flawless."
- Hans M. (Germany)
"Perfect chip flow. The internal coolant holes are aligned perfectly for deep 3D bores."
- Marek W. (Poland)
"Precision is top-notch. Matches our SPMG06 inserts with zero play."
- Pedro S. (Brazil)
"Fast shipping to London. Great industrial quality tool."
- Arthur L. (UK)
"Highly recommended for production work. Consistent tool life."
- Y. Watanabe (Japan)
SP Series Indexable Drill: Advantages & Considerations
- Uses 4-edge SPMG square inserts for lower cost-per-edge.
- Optimized for Blind Hole Machining (Flatter hole bottom profile).
- Reinforced body core provides maximum rigidity for 16.5mm diameters.
- Requires high horsepower CNC machines to drive indexable inserts effectively.
- Performance is highly dependent on high-pressure internal coolant.
Technical Q&A
Q: Why choose SP over WC for blind hole drilling?
A: SP square inserts create a significantly flatter bottom. The SP body is also designed with a thicker core, which is essential for stability in large diameter boring.
Q: Is this tool body compatible with all SPMG06 inserts?
A: It is designed for standard SPMG060204 carbide inserts. Using BEYOND brand inserts is recommended for the best fit.
Q: Can I use this on a manual drill press?
A: No. Indexable U-drills require the high torque and rigidity of a CNC Lathe or Milling Machine.
Machinist Tip: SP vs. WC U-Drills
SP Series (Square): The professional choice for Blind Hole (Blind Bores). Square inserts create a flatter bottom and offer maximum core strength for large diameter machining.
WC Series (Trigon): Primarily used for Through Hole applications. WC inserts offer more cutting edges but the body core is thinner, making it less rigid for 16.5mm 3D tasks.
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.