BEYOND SP C32-5D-SD31.5-SP09 Indexable U-Drill | 31.5mm CNC Deep Hole Drill Body
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BEYOND SP C32-5D-SD31.5-SP09
31.5mm 5D Indexable U-Drill | Professional CNC Deep Hole Boring Body
Industrial-Grade 31.5mm Deep Hole Drilling Specialist
The BEYOND SP C32-5D-SD31.5-SP09 is a high-performance indexable insert drill engineered for heavy-duty metal removal. With its 31.5mm cutting diameter and a massive 5D depth ratio, this fast hole U-drill is the ultimate solution for deep hole boring in industrial CNC applications. Utilizing internal cooling technology, it maintains stability during high-speed drilling in carbon steel, alloy, and stainless steel.
What Does the Model Code Mean?
Technical Data & Size Conversion
| Specification | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Cutting Diameter (SD) | 31.5 mm | 1.240" |
| Shank Diameter (C) | 32.0 mm | 1.259" |
| Max Drilling Depth (5D) | 157.5 mm | 6.200" |
| Overall Length (L) | 233 mm | 9.173" |
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 157.5mm depths, metal chips are effectively flushed out by the internal cooling holes, preventing chip packing and protecting the carbide inserts.
Recommended Cutting Parameters (5D 31.5mm)
Optimize your CNC machining with these baseline settings for 45# Steel:
- Cutting Speed (Vc): 100 - 150 m/min
- Feed Rate (f): 0.07 - 0.13 mm/rev
- Rotation Speed (N): Calculated as $$N = \frac{Vc \times 1000}{\pi \times 31.5}$$
- 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 deep hole boring.
- Thicker tool core provides higher rigidity than WC drills.
- Requires higher spindle power/torque for 31.5mm diameter.
- Absolute reliance on internal coolant systems.
Verified Customer Feedback
"Solid Deep Hole Performance"
"Drilling 31.5mm in structural steel was easy. The 5D length stays rigid without vibration."
- Mike T. (USA)
"Efficient Chip Flow"
"Polished flutes work wonders. No chip packing even at 150mm depth."
- Jurgen R. (Germany)
"Perfect fit for my CNC setup."
- Kenji A. (Japan)
"Best price for 5D reach."
- Ahmed S. (UAE)
"Very tough drill body, survived a crash with minimal damage."
- 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.
Q: What is the benefit of the Side-Lock (C32) shank?
A: It prevents the tool from rotating in the holder during high-torque 31.5mm cuts, ensuring operator safety.
Q: Can this handle intermittent cuts?
A: Yes, the 20CrMnTi core is tough enough for interrupted drilling in CNC lathes.
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.