BEYOND SP C25-3D-SD21-SP06 Indexable U-Drill Body | 21mm 3D CNC Boring Drill
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BEYOND SP C25-3D-SD21-SP06
21mm 3D Heavy-Duty U-Drill | Precision Blind Hole Boring Specialist
Industrial-Grade 21mm Indexable Boring Solution
The BEYOND SP C25-3D-SD21-SP06 is a high-performance indexable insert drill engineered for maximum stability. With a 21mm cutting diameter and a 3D depth ratio (63mm reach), this tool is the primary choice for blind hole machining. Utilizing internal cooling and a precision-engineered spiral flute, it ensures rapid chip evacuation and superior surface finish in CNC boring operations.
Decoding the Model: SP C25-3D-SD21-SP06
Metric & Imperial Technical Specifications
| Feature | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Drilling Diameter (SD) | 21.0 mm | 0.827" |
| Shank Diameter (C) | 25.0 mm | 0.984" |
| Max Drilling Depth (3D) | 63.0 mm | 2.480" |
| Equivalent Model | SP-C0.984-3D-SD0.827-SP06 | |
Forged 20CrMnTi Alloy & High-Efficiency Spiral Flute
Industrial Build: This indexable drill body is forged from 20CrMnTi alloy steel and vacuum quenched (HRC 52-55) for maximum rigidity. The surface is treated with a Black Oxide finish to resist corrosion and thermal wear. This provides the extreme core rigidity required for large diameter drilling stability.
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 from the cutting zone, essential for blind hole machining.
Recommended Cutting Parameters (21mm 3D)
Guidelines for Steel and Cast Iron applications. Adjust based on CNC rigidity:
Rotation Speed (N) = (Vc × 1000) / (π × 21)
Vc = Cutting Speed | π ≈ 3.14 | D = 21mm
- Cutting Speed (Vc): 120 - 190 m/min
- Feed Rate (f): 0.06 - 0.14 mm/rev
- Coolant: High-pressure internal cooling is mandatory for 21mm 3D depth.
Achieve maximum stability with a high-rigidity C25 side-lock holder:
SHOP COMPATIBLE C25 TOOL HOLDERSVerified Global Reviews
"Solid 21mm Performance"
"I use this for blind holes in 45# steel. Stability of the BEYOND body is superior. Great build."
- Hans M. (Germany)
"Perfect chip flow. The internal coolant makes a huge difference at 3D depth."
- Marek W. (Poland)
"Precise SPMG06 pockets. Excellent price for a high-quality U-drill."
- Pedro S. (Brazil)
"Fast shipping to the UK. Very reliable tooling for our workshop."
- Arthur L. (UK)
"Very robust tool. Perfect for our Geely production lines."
- 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 21mm diameters.
- Requires high horsepower CNC machines to drive a 21mm drill 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 inserts is recommended for the best fit.
Q: Can this be used on a manual lathe?
A: It is highly recommended for CNC machining due to the high feed rate and torque requirements.
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 21mm 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.