BEYOND SP C40-4D-SD39-SP11 Indexable U-Drill Body | 39mm 4D CNC Deep Hole Drill
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BEYOND SP C40-4D-SD39-SP11
39mm 4D Heavy-Duty U-Drill | Precision Blind Hole Boring Specialist
Industrial-Grade 39mm Large Diameter Boring Tool
The BEYOND SP C40-4D-SD39-SP11 is a high-performance indexable insert drill engineered for extreme stability in deep hole boring. With a 39mm cutting diameter and a 4D depth ratio (156mm reach), this tool is the primary choice for blind hole machining. Featuring internal cooling and a precision-engineered spiral flute, it ensures rapid chip evacuation and superior surface finish on CNC lathes and machining centers.
Decoding the Model: SP C40-4D-SD39-SP11
Metric & Imperial Technical Specifications
| Feature | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Drilling Diameter (SD) | 39.0 mm | 1.535" |
| Shank Diameter (C) | 40.0 mm | 1.575" |
| Max Drilling Depth (4D) | 156.0 mm | 6.142" |
| Equivalent Model | SP-C1.575-4D-SD1.535-SP11 | |
High-Strength 20CrMnTi Alloy & Optimized Flute Design
Durable Tool Body Material: This indexable drill body is forged from premium 20CrMnTi high-strength alloy steel. The surface is treated with a vacuum-quenched hardening process (HRC 52-55), providing incredible wear resistance and preventing tool deflection during large diameter drilling. Its shock-resistant core is perfect for handling interrupted cuts in heavy-duty machining.
Optimized Spiral Flute (U-Groove): The specialized U-groove geometry features wide, polished chip pockets designed for high-volume chip flow. Combined with dual internal cooling holes, it allows high-pressure coolant to flush metal chips out of 156mm deep bores instantly, preventing chip packing and protecting the carbide inserts from thermal failure during blind hole machining.
Recommended Cutting Parameters (39mm 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 $$N = \frac{Vc \times 1000}{\pi \times 39}$$
- Coolant: High-pressure internal cooling (Thru-spindle) is mandatory for 4D depth.
Looking for a compatible heavy-duty holder for the 40mm shank?
SHOP COMPATIBLE C40 TOOL HOLDERSVerified Customer Reviews
"Solid Performance"
"I was worried about 39mm at 4D reach, but the BEYOND body is rock solid in 4140 steel. Minimal vibration."
- James M. (USA)
"Efficient Chip Removal"
"Internal cooling flushes chips out perfectly even at 150mm deep. Build quality is top-notch."
- Klaus R. (Germany)
"Top quality 20CrMnTi alloy steel. Arrived in Brazil quickly. Very satisfied."
- Felipe G. (Brazil)
"Perfect for blind holes. Square inserts leave a very clean bottom. Much better than WC for this."
- Liam O. (UK)
"Better performance than more expensive European brands. Great value indexable tool."
- S. Tanaka (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).
- Reinforced tool body core for superior 4D depth rigidity.
- Higher torque requirement for large 39mm diameter.
- Requires high-pressure coolant to ensure chip evacuation at 156mm.
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. Additionally, the tool body is thicker and more rigid, which is essential for deep bores.
Q: Does this include the inserts?
A: No, this is for the tool body only. It is compatible with SPMG110408 carbide inserts.
Q: What is the benefit of the Side-Lock (C40) shank?
A: The 40mm straight shank allows for massive clamping force in side-lock holders, preventing tool rotation under high torque.
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-5D 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.