BEYOND SP C40-4D-SD39.5-SP11 Indexable U-Drill Body | 39.5mm 4D CNC Deep Hole Drill
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BEYOND SP C40-4D-SD39.5-SP11
39.5mm 4D Heavy-Duty U-Drill | High-Rigidity Blind Hole Boring Specialist
Industrial 39.5mm High-Efficiency Boring Specialist
The BEYOND SP C40-4D-SD39.5-SP11 is a professional indexable insert drill engineered for extreme stability in deep hole boring. With a 39.5mm cutting diameter and a 4D depth ratio (158mm reach), this tool is the primary choice for blind hole machining. Featuring internal cooling and a high-efficiency spiral flute, it ensures rapid chip evacuation and superior surface finish on CNC lathes and machining centers. This rapid drill is optimized for high-torque operations in steel, alloy, and cast iron.
Decoding the Model: SP C40-4D-SD39.5-SP11
Metric & Imperial Technical Specifications
| Feature | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Drilling Diameter (SD) | 39.5 mm | 1.555" |
| Shank Diameter (C) | 40.0 mm | 1.575" |
| Max Drilling Depth (4D) | 158.0 mm | 6.220" |
| Equivalent Model | SP-C1.575-4D-SD1.555-SP11 | |
Premium 20CrMnTi Steel & Advanced Spiral Flute
Industrial Grade Material: This indexable drill body is forged from 20CrMnTi high-strength alloy steel. The surface is vacuum-quenched to reach HRC 52-55, providing immense wear resistance and preventing tool deflection during large diameter drilling. The shock-resistant core is perfect for handling interrupted cuts in heavy-duty machining.
High-Efficiency Spiral Flute (U-Groove): The specialized U-groove geometry features wide, polished chip pockets designed for massive chip flow. Combined with dual internal cooling holes, it allows high-pressure coolant to flush metal chips out of deep bores instantly, preventing chip packing and protecting the carbide inserts from heat failure during blind hole machining.
Recommended Cutting Parameters (39.5mm 4D)
Suggested for Carbon Steel (HB < 250). Adjust based on machine rigidity:
- Cutting Speed (Vc): 110 - 180 m/min
- Feed Rate (f): 0.08 - 0.18 mm/rev
- Rotation Speed (N): Calculated as $$N = \frac{Vc \times 1000}{\pi \times 39.5}$$
- Coolant: High-pressure internal cooling is mandatory for 4D depth.
Need a side-lock tool holder for your 40mm shank U-Drill?
SHOP COMPATIBLE C40 TOOL HOLDERSVerified Customer Reviews
"Exceptional Stability"
"I was worried about 39.5mm at 4D reach, but the BEYOND body is rock solid. Minimal vibration."
- David H. (USA)
"Perfect Blind Holes"
"The flat bottom from the SP inserts is exactly what we needed for our blind bores. Great tool."
- Klaus M. (Germany)
"Very fast shipping to Brazil. The surface finish is excellent."
- Ricardo S. (Brazil)
"Using this on a CNC lathe. Chip evacuation is smooth with thru-coolant."
- Mark B. (Australia)
"Excellent price-to-performance ratio compared to our previous brand."
- S. Patel (India)
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).
- Reinforced core provides superior rigidity for 4D deep bores.
- Higher torque/power requirement for 39.5mm diameter.
- Coolant pressure is critical for chip removal at 158mm depth.
Technical Q&A
Q: Why is SP better than WC for blind holes?
A: SP square inserts provide a flatter profile at the bottom of the bore. The SP tool body also has a thicker core, providing the rigidity needed for deep holes.
Q: Does this include the inserts?
A: No, this is for the tool body only. It is compatible with SPMG110408 carbide inserts.
Q: Can I use this on a CNC lathe without a rotating spindle?
A: Yes, as long as you have internal coolant through the turret and proper alignment.
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 4D deep hole boring.
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 than SP for extreme depths.
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.