BEYOND SP C40-3D-SD41-SP11 Indexable U-Drill Body | 41mm 3D CNC Boring Drill
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BEYOND SP C40-3D-SD41-SP11
41mm 3D Heavy-Duty U-Drill | Precision Blind Hole Boring Specialist
Industrial-Grade 41mm Indexable Boring Solution
The BEYOND SP C40-3D-SD41-SP11 is a high-performance indexable insert drill engineered for maximum stability in large diameter boring operations. With a 41mm cutting diameter and a 3D depth ratio (123mm 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 on heavy-duty CNC lathes.
Decoding the Model: SP C40-3D-SD41-SP11
Metric & Imperial Technical Specifications
| Feature | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Drilling Diameter (SD) | 41.0 mm | 1.614" |
| Shank Diameter (C) | 40.0 mm | 1.575" |
| Max Drilling Depth (3D) | 123.0 mm | 4.842" |
| Equivalent Model | SP-C1.575-3D-SD1.614-SP11 | |
Hardened 20CrMnTi Alloy & High-Volume Spiral Flute
Industrial-Grade Build: Forged from premium 20CrMnTi alloy steel, this indexable drill body undergoes vacuum quenching (HRC 52-55) to provide the extreme rigidity needed for large diameter drilling. The surface is treated to resist corrosion and wear, ensuring longevity in high-heat CNC boring environments.
Advanced Spiral Flute: The U-drill features an optimized spiral flute (U-groove) design. Combined with dual internal cooling holes, it allows high-pressure coolant to flush metal chips out of 123mm deep bores instantly, preventing chip accumulation and protecting the carbide inserts during blind hole machining.
Recommended Cutting Parameters (41mm 3D)
Suggested for Carbon Steel and Alloy Steel. Adjust based on machine rigidity:
- Cutting Speed (Vc): 120 - 180 m/min
- Feed Rate (f): 0.07 - 0.15 mm/rev
- Rotation Speed (N): Calculated as $$N = \frac{Vc \times 1000}{\pi \times 41}$$
- Coolant: High-pressure internal cooling is mandatory for 41mm 3D depth.
Looking for a compatible side-lock holder for the 40mm shank?
SHOP COMPATIBLE C40 TOOL HOLDERSVerified Global Reviews
"Impressive 41mm Stability"
"I use this for blind holes in 4140 steel. The rigidity of the BEYOND body is superior to others I've tried. Very stable at 3D depth."
- Robert H. (Germany)
"Efficient Chip Dispersal"
"No more bird nesting. The spiral flutes and internal coolant work perfectly together."
- Marek W. (Poland)
"Great value tool. The SPMG11 pocket is very precise. Excellent surface finish on the hole bottom."
- Pedro S. (Brazil)
"Shipping was fast to the UK. BEYOND tools are becoming our standard in the shop."
- Arthur L. (UK)
"Professional quality. We run this 41mm U-drill on our Geely production line components."
- 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 41mm diameters.
- Requires higher machine torque compared to smaller diameters.
- Dependency on high-pressure internal coolant flow for 123mm reach.
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 SPMG11 inserts?
A: It is designed for standard SPMG110408 carbide inserts. Using BEYOND inserts is recommended for the best fit and tool life.
Q: Can this be used on a manual lathe?
A: It is highly recommended for CNC machining due to the feed rate and torque requirements, but can be used on powerful manual lathes with a rigid setup.
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 41mm 3D 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.