BEYOND SP C32-5D-SD27-SP07 Indexable U-Drill | 27mm 5D CNC Deep Hole Drill Body
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BEYOND SP C32-5D-SD27-SP07
27mm 5D Indexable U-Drill | Professional Blind Hole CNC Boring Body
Precision 27mm Deep Hole Machining
The BEYOND SP C32-5D-SD27-SP07 is a high-rigidity indexable insert drill engineered for extreme stability in deep hole boring. With a 27mm cutting diameter and a 5D depth ratio, this tool is the industry choice for blind hole machining. Featuring internal cooling and a specialized spiral flute, it ensures high-speed efficiency and superior surface finish on CNC lathes.
What Does the Model Code Mean?
Metric & Imperial Specifications
| Feature | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Cutting Diameter (SD) | 27.0 mm | 1.063" |
| Shank Diameter (C) | 32.0 mm | 1.259" |
| Drilling Depth (5D) | 135.0 mm | 5.315" |
| Imperial Ref. Model | SP-C1.25-5D-SD1.063-SP07 | |
20CrMnTi Alloy & High-Efficiency Spiral Flute
Superior 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 while the core remains shock-resistant to withstand interrupted cuts during deep hole boring.
Optimized Spiral Flute (U-Groove): The spiral flute geometry is designed with extra-large chip slots. Paired with dual internal cooling holes, it allows high-pressure coolant to flush metal chips out of 135mm deep bores instantly, preventing chip packing and protecting the carbide inserts from heat failure.
Recommended Cutting Parameters (5D 27mm)
Suggested for Carbon Steel (HB < 250). Adjust based on machine rigidity:
- Cutting Speed (Vc): 120 - 175 m/min
- Feed Rate (f): 0.06 - 0.12 mm/rev
- Rotation Speed (N): Calculated as $$N = \frac{Vc \times 1000}{\pi \times 27}$$
- Coolant: High-pressure internal cooling (Min 1.5 MPa) is mandatory for 5D.
SP Series U-Drill: Advantages & Considerations
- Uses 4-edge SPMG square inserts (Cost-effective).
- Exceptional stability for Blind Hole Machining.
- High core thickness ensures minimal deflection at 135mm reach.
- Higher power requirement compared to standard twist drills.
- Sensitive to unstable coolant pressure.
Global Customer Feedback
"Solid Blind Boring"
"Switched from WC to this SP drill for blind bores. Bottom finish is much flatter and stable at 5D depth."
- Robert H. (USA)"Highly Rigid"
"20CrMnTi steel is very tough. Zero vibration in 4140 steel."
- Klaus W. (Germany)"Great for the price"
- Hiroshi T. (Japan)
"Accurate deep holes"
- Marc L. (France)
"Fast chip flow"
- Liam G. (UK)
Technical Q&A
Q: Why is SP better for blind holes?
A: SP square inserts provide a flatter hole bottom profile and higher body rigidity compared to WC trigon models.
Q: What is the benefit of the Side-Lock shank?
A: The C32 (32mm) straight shank with a flat allows for massive clamping force, preventing the tool from rotating under high torque.
Q: Can I use this for shallow hole drilling?
A: Yes, while rated for 5D, it works perfectly for 2D or 3D depths as well.
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 5D depths.
WC Series (Trigon): Primarily used for Through Hole applications. WC inserts offer 6 edges but the body core is thinner, making it 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.