BEYOND SP C32-5D-SD28.5-SP09 Indexable U-Drill | 28.5mm 5D CNC Deep Hole Drill Body
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BEYOND SP C32-5D-SD28.5-SP09
28.5mm 5D Indexable U-Drill | Professional Blind Hole Boring Specialist
High-Rigidity 28.5mm Deep Hole Drilling
The BEYOND SP C32-5D-SD28.5-SP09 is a premium indexable insert drill engineered for extreme stability in deep hole boring. With a 28.5mm cutting diameter and a 5D depth ratio, this tool is the industry standard for blind hole machining. Featuring internal cooling and a specialized spiral flute, it ensures high-speed efficiency in CNC lathe operations.
What Does the Model Code Mean?
Technical Data & Size Conversion
| Specification | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Cutting Diameter (SD) | 28.5 mm | 1.122" |
| Shank Diameter (C) | 32.0 mm | 1.259" |
| Max Drilling Depth (5D) | 142.5 mm | 5.610" |
| Overall Length (L) | 218 mm | 8.582" |
20CrMnTi Alloy & High-Efficiency Spiral Flute
Premium Tool Body Material: This indexable drill body is forged from 20CrMnTi high-strength alloy steel. The surface is vacuum-quenched to achieve HRC 50-55, providing incredible wear resistance. Its flexible core prevents catastrophic failure during shallow hole drilling and extreme 5D penetrations.
Advanced Spiral Flute (U-Groove): The spiral flute geometry is designed with extra-large chip slots. This ensures that even at 142.5mm depths, metal chips are effectively flushed out by the internal cooling holes, preventing chip packing and protecting the carbide inserts.
Recommended Cutting Parameters (5D 28.5mm)
Optimize your CNC machining with these baseline settings for 45# Steel:
- Cutting Speed (Vc): 110 - 160 m/min
- Feed Rate (f): 0.07 - 0.14 mm/rev
- Rotation Speed (N): Calculated as $$N = \frac{Vc \times 1000}{\pi \times 28.5}$$
- Requirement: High-pressure internal cooling (Min 1.5 MPa) is mandatory for 5D.
SP Type U-Drill: Pros and Cons
- Uses SPMG square inserts with 4 usable cutting edges (Higher economy).
- Superior hole verticality and accuracy in blind hole boring.
- Thicker tool core provides higher rigidity than WC drills for deep reach.
- Requires higher spindle power/torque for 28.5mm diameter.
- Absolute reliance on internal coolant systems for chip flushing.
Verified Customer Feedback
"Solid for Blind Holes"
"I use this for blind hole machining in carbon steel. The SP series provides a much flatter bottom than WC."
- Mike T. (USA)
"Rigid 5D Performance"
"Surprised by the stability at 140mm depth. Chip evacuation is smooth with good coolant pressure."
- Jurgen R. (Germany)
"Fast delivery and high build quality. Fits perfectly in my CNC lathe."
- Kenji A. (Japan)
"Excellent price-to-performance ratio."
- Ahmed S. (UAE)
"Highly durable tool body. Survived several hard runs without issues."
- Steve B. (Australia)
Technical Q&A
Q: Is a pilot hole required?
A: For 5D depths, we recommend starting with a short 2D U-drill starter hole to ensure the 5D tool enters perfectly straight and minimizes vibration.
Q: Can I use this for through holes?
A: Yes, but SP is specifically optimized for blind holes. For exclusively through-hole work, the WC series may be more cost-effective due to insert geometry.
Q: What material are the cooling holes?
A: They are precision-drilled internal passages designed for high-pressure coolant or air.
Technical Tip: SP vs. WC U-Drills
SP Series (Square): The professional choice for Blind Hole (Blind Bores). The square insert geometry provides a flatter hole bottom. Superior rigidity for Deep Hole (5D) drilling.
WC Series (Trigon): Primarily used for Through Hole applications. WC inserts offer 6 edges but the body core is thinner, making it slightly less rigid than SP for extreme depths.
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.