BEYOND SP C25-2D-SD21.5-SP06 Indexable U-Drill Body | 21.5mm 2D CNC Boring Drill
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BEYOND SP C25-2D-SD21.5-SP06
21.5mm 2D Heavy-Duty U-Drill | Precision Blind Hole Boring Specialist
Industrial 21.5mm Indexable Boring Solution
The BEYOND SP C25-2D-SD21.5-SP06 is a professional-grade indexable insert drill engineered for high-speed CNC boring and rapid hole drilling. Featuring a 21.5mm cutting diameter and a 2D depth ratio (43mm reach), this tool is the primary choice for blind hole machining. Equipped with internal cooling and optimized spiral flutes, it ensures superior chip evacuation and surface finish in carbon steel, alloy steel, and stainless steel.
Decoding the Model: SP C25-2D-SD21.5-SP06
Metric & Imperial Technical Specifications
| Feature | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Drilling Diameter (SD) | 21.5 mm | 0.846" |
| Shank Diameter (C) | 25.0 mm | 0.984" |
| Max Drilling Depth (2D) | 43.0 mm | 1.693" |
| Equivalent Model | SP-C1.0-2D-SD0.846-SP06 | |
Premium 20CrMnTi Alloy & High-Efficiency Flute Design
Industrial Build: Our U-drill body is forged from superior 20CrMnTi alloy steel, vacuum quenched to HRC 52-55. This core rigidity is essential for large diameter drilling stability and preventing tool deflection. The surface features a Black Oxide finish for superior thermal wear resistance during rapid hole boring cycles.
Advanced Slot Geometry: The tool features an optimized spiral flute (U-groove) specifically engineered to evacuate the high volume of chips produced by a 21.5mm bore. Integrated internal cooling holes allow high-pressure coolant to flush metal chips directly out of the cutting zone—essential for blind hole machining to prevent chip re-cutting.
Recommended Cutting Parameters (21.5mm 2D)
Optimal settings for General Steel and Carbon Steel. Adjust based on CNC rigidity:
Rotation Speed (N) = (Vc × 1000) / (π × 21.5)
- Cutting Speed (Vc): 120 - 200 m/min
- Feed Rate (f): 0.06 - 0.16 mm/rev
- Coolant: Center-through internal cooling is mandatory for chip flushing.
Maximize precision with our high-performance SPMG06 Carbide Inserts:
SHOP SPMG06 CARBIDE INSERTSVerified Customer Feedback
"Superior for Blind Holes"
"Using this 21.5mm SP drill for blind bores in alloy steel. The bottom finish is remarkably flat. Body is very rigid."
- Mike T. (USA)
"The spiral flutes clear chips very well with internal coolant. Zero vibration."
- Pierre B. (France)
"Solid construction and fits SPMG06 inserts perfectly. Excellent value."
- Luca R. (Italy)
"Fast shipping to the UAE. Tool performs exactly as described on my CNC lathe."
- Ahmed H. (UAE)
"Great rigidity even at higher feeds. Beyond tools never disappoint."
- Steve J. (Australia)
SP Series Indexable Drill: Advantages & Considerations
- Uses 4-edge SPMG square inserts for lower cost-per-edge.
- Optimized for Blind Hole Machining (Creates a flat-bottom profile).
- Thicker body core provides maximum stability for 21.5mm drilling.
- Requires slightly higher CNC torque than trigon drills.
- Performance is 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: What is the maximum depth for this 2D drill?
A: The 2D indicates 2x the diameter. For a 21.5mm drill, the maximum effective drilling depth is 43mm.
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.
WC Series (Trigon): Primarily used for Through Hole applications. WC inserts offer more edges but the body core is thinner, making it less rigid for 21.5mm 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.