BEYOND SP C32-3D-SD35.5-SP11 Indexable U-Drill Body | 35.5mm 3D CNC Boring Drill
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BEYOND SP C32-3D-SD35.5-SP11
35.5mm 3D Heavy-Duty U-Drill | Precision Blind Hole Boring Specialist
Industrial 35.5mm Indexable Boring Solution
The BEYOND SP C32-3D-SD35.5-SP11 is an industrial-grade indexable insert drill engineered for maximum stability in large diameter boring. With a 35.5mm cutting diameter and a 3D depth ratio (106.5mm 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 high-power CNC lathes.
Decoding the Model: SP C32-3D-SD35.5-SP11
Metric & Imperial Technical Specifications
| Feature | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Drilling Diameter (SD) | 35.5 mm | 1.398" |
| Shank Diameter (C) | 32.0 mm | 1.260" |
| Max Drilling Depth (3D) | 106.5 mm | 4.193" |
| Equivalent Model | SP-C1.260-3D-SD1.398-SP11 | |
Forged 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 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 deep bores instantly, preventing chip accumulation and protecting the carbide inserts during blind hole machining.
Recommended Cutting Parameters (35.5mm 3D)
Suggested for Carbon Steel and Alloy Steel. Use the formula below for your CNC setup:
Rotation Speed (N) = (Vc × 1000) / (π × 35.5)
Where: Vc = Cutting Speed | π ≈ 3.14 | D = 35.5mm (Drill Diameter)
- Cutting Speed (Vc): 110 - 180 m/min
- Feed Rate (f): 0.08 - 0.16 mm/rev
- Coolant: High-pressure internal cooling is mandatory for 35.5mm diameters.
Need a side-lock holder for your 32mm shank?
SHOP COMPATIBLE C32 TOOL HOLDERSVerified Global Reviews
"Solid 35.5mm Performance"
"I use this for blind holes in 4140 steel. The BEYOND body is very robust and handles high torque easily. Robert H. was right about the stability."
- Hans M. (Germany)
"Internal coolant works perfectly. No chip packing even at 3D depth."
- Marek W. (Poland)
"SPMG11 pockets are very precise. High industrial quality for the price."
- Pedro S. (Brazil)
"Fast shipping to the UK. Tooling is reliable for our CNC shop."
- Arthur L. (UK)
"Excellent for automotive parts. Works great on our Geely parts line."
- 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 35.5mm diameters.
- Requires high horsepower CNC machines to drive a 35.5mm drill effectively.
- Performance is highly dependent on high internal coolant pressure.
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.
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 35.5mm 3D heavy-duty tasks.
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.