BEYOND SP C40-3D-SD39.5-SP11 Indexable U-Drill Body | 39.5mm 3D CNC Boring Drill
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BEYOND SP C40-3D-SD39.5-SP11
39.5mm 3D Indexable U-Drill | The Blind Hole Machining Expert
High-Precision 39.5mm CNC Boring Solution
The BEYOND SP C40-3D-SD39.5-SP11 is an industrial-grade indexable insert drill designed for heavy-duty large diameter boring. With a 39.5mm cutting diameter and a 3D depth ratio (118.5mm reach), this tool excels in blind hole machining where a flat bottom and high wall accuracy are required. Engineered for the modern CNC shop, it features integrated internal cooling to handle the heat of deep-hole production.
Model Breakdown: SP C40-3D-SD39.5-SP11
Technical Specifications: Metric vs. Imperial
| Parameter | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Drilling Diameter (SD) | 39.5 mm | 1.555" |
| Shank Diameter (C) | 40.0 mm | 1.575" |
| Max Depth (3D) | 118.5 mm | 4.665" |
| Equivalent Model | SP-C1.575-3D-SD1.555-SP11 | |
Premium 20CrMnTi Construction & Chip Flow
Anti-Vibration Body: Built from high-strength 20CrMnTi alloy steel and quenched to HRC 52-55, this tool body provides the rigid foundation needed for large diameter drilling without chatter. The Black Oxide finish prevents surface galling and extends tool life.
Optimized Chip Flutes: The wide-opening spiral flute design, paired with dual internal cooling holes, creates a high-velocity "flush" effect. This ensures that chips are discharged immediately from the 39.5mm bore, preventing insert breakage caused by chip recutting.
Recommended Cutting Parameters (39.5mm)
For Carbon Steel & Alloy Steel production. Use this formula for RPM settings:
Rotation Speed (N) = (Vc × 1000) / (π × 39.5)
Vc = Cutting Speed | π ≈ 3.14 | D = 39.5mm
- Cutting Speed (Vc): 110 - 180 m/min
- Feed Rate (f): 0.08 - 0.16 mm/rev
- Coolant Strategy: Continuous high-pressure internal cooling is required.
Maximize rigidity with a dedicated C40 side-lock holder:
VIEW COMPATIBLE TOOL HOLDERSGlobal Customer Testimonials
"Top Tier 39.5mm Body"
"Perfect for our blind hole requirements. The tool body doesn't flex, which keeps the hole perfectly straight."
- Robert H. (Germany)
"Impressive Flow"
"Internal coolant is powerful. Even at 3D depth, the chips come out fast and clean."
- Marek W. (Poland)
"Using BEYOND for 6 months. Best price-to-performance for indexable drills."
- Pedro S. (Brazil)
"Solid industrial tool. Arrived in London in less than 10 days."
- Arthur L. (UK)
SP Series Performance Profile
- 4 cutting edges per insert for cost efficiency.
- Optimized for Blind Hole Machining (Flatter bottom profile).
- High core rigidity for large diameter boring torque.
- Requires high horsepower CNC machines for 39.5mm.
- Performance drops if internal coolant pressure is inconsistent.
Technical Q&A
Q: Why use SP for blind holes instead of WC?
A: The SP U-drill uses square inserts which produce a flatter hole bottom. WC (Trigon) drills are better for through holes but leave a conical shape at the bottom of blind bores.
Q: What inserts should I use with this?
A: This body is precision-machined for SPMG110408 inserts. We recommend BEYOND series inserts for the most rigid fit.
Quick Tip: SP vs. WC for 39.5mm Holes
Choose SP Series for precision Blind Bores where bottom flatness is critical. The square insert design provides the highest core strength for heavy production boring. Choose WC Series for rapid Through Hole drilling where cutting edge count is more important than hole bottom geometry.
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.