BEYOND SP C40-3D-SD55-SP09 Indexable U-Drill Body | 55mm 3D CNC Large Hole Drill
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BEYOND SP C40-3D-SD55-SP09
55mm 3D Heavy-Duty U-Drill | Precision Large Diameter Blind Hole Specialist
Industrial-Grade 55mm Indexable Boring Solution
The BEYOND SP C40-3D-SD55-SP09 is a high-performance indexable insert drill engineered for maximum material removal in large diameter boring. With a massive 55mm cutting diameter and a 3D depth ratio (165mm reach), this tool is the ultimate choice for blind hole machining. Featuring internal cooling and a precision-engineered spiral flute, it ensures stable chip evacuation even in heavy-duty CNC applications.
Decoding the Model: SP C40-3D-SD55-SP09
Metric & Imperial Technical Specifications
| Feature | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Drilling Diameter (SD) | 55.0 mm | 2.165" |
| Shank Diameter (C) | 40.0 mm | 1.575" |
| Max Drilling Depth (3D) | 165.0 mm | 6.496" |
| Equivalent Model | SP-C1.575-3D-SD2.165-SP09 | |
Reinforced 20CrMnTi Alloy & Power-Groove Flute
Industrial-Grade Build: Forged from high-tensile 20CrMnTi alloy steel, the body is vacuum-quenched to HRC 52-55. This provides the extreme rigidity required for large diameter drilling, preventing chatter and ensuring a high-quality surface finish. The black oxide surface treatment enhances corrosion resistance and reduces friction.
Heavy-Duty Spiral Flute: The specialized spiral flute (U-groove) is optimized for high-volume chip evacuation. Paired with central internal cooling, it flushes chips out of 165mm deep bores with ease, protecting your carbide inserts from heat build-up and chip packing.
Recommended Cutting Parameters (55mm 3D)
Optimal for Steel and Cast Iron. Adjust based on machine power (high torque required):
- Cutting Speed (Vc): 100 - 150 m/min
- Feed Rate (f): 0.08 - 0.15 mm/rev
- Rotation Speed (N): Calculated as $$N = \frac{Vc \times 1000}{\pi \times 55}$$
- Coolant: High-pressure internal cooling is mandatory for large 55mm diameters.
Looking for a compatible side-lock holder for the 40mm shank?
SHOP COMPATIBLE C40 TOOL HOLDERSGlobal Machinist Reviews
"Incredible Power"
"Drilling 55mm holes in 1045 steel. The tool body is extremely rigid. No vibration at all on our heavy CNC lathe."
- Robert H. (Germany)
"Clean Blind Holes"
"Needed a flat bottom for a large manifold. This SP series delivered perfectly. High quality from China."
- Marek W. (Poland)
"Great B2B procurement experience. Fits SPMG09 inserts perfectly. Durable for 24/7 production."
- Pedro S. (Brazil)
"Strong chip evacuation even at 160mm deep. Internal cooling is key. Highly recommend."
- Arthur L. (UK)
"Very cost-effective for large diameters. Tool body holds up well to repeated use."
- Y. Watanabe (Japan)
SP Series Indexable Drill: Advantages & Considerations
- Uses 4-edge SPMG square inserts for low cost-per-edge.
- Optimized for Blind Hole Machining (Flatter hole bottom).
- Massive 40mm shank for maximum torque transmission.
- Requires high-power spindle/machine due to large diameter.
- Critical dependency on high-flow internal coolant.
Technical Q&A
Q: Why use SP instead of WC for a 55mm hole?
A: SP inserts are square and provide much higher stability and core rigidity, which is essential for massive 55mm cuts. It also leaves a much flatter bottom for blind bores.
Q: Are inserts included?
A: No, this is for the tool body only. You will need SPMG090408 inserts.
Q: Can I use this on a CNC lathe?
A: Absolutely. It is widely used on CNC lathes with C40 side-lock holders for heavy-duty boring.
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): Better suited for Through Hole applications. WC inserts offer more cutting edges but the body core is thinner, making it less rigid for 55mm heavy-duty 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.