BEYOND SP C25-5D-SD25-SP07 Indexable U-Drill Body | 25mm 5D CNC Deep Hole Drill
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BEYOND SP C25-5D-SD25-SP07
25mm 5D Indexable U-Drill | Precision Blind Hole Boring Specialist
Industrial-Grade 25mm Deep Hole Boring
The BEYOND SP C25-5D-SD25-SP07 is a high-performance indexable insert drill engineered for precision metal removal. With a 25mm cutting diameter and a massive 5D depth-to-diameter ratio, this fast hole U-drill is the ultimate tool for deep hole boring. Designed specifically for CNC lathe metal boring, it excels in creating flat-bottom blind holes with its optimized internal cooling system.
What Does the Model Code Mean?
Technical Data & Size Conversion
| Specification | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Cutting Diameter (SD) | 25.0 mm | 0.984" |
| Shank Diameter (C) | 25.0 mm | 0.984" |
| Drilling Depth (5D) | 125.0 mm | 4.921" |
| Imperial Ref. Model | SP-C1.0-5D-SD0.984-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 specialized U-groove geometry features wide chip pockets. Combined with dual internal cooling holes, it allows high-pressure coolant to flush metal chips out of 125mm deep bores instantly, preventing chip packing and protecting the carbide inserts from heat failure.
Recommended Cutting Parameters (5D 25mm)
Baseline settings for Medium Carbon Steel. Adjust for your machine rigidity:
- Cutting Speed (Vc): 120 - 180 m/min
- Feed Rate (f): 0.05 - 0.11 mm/rev
- Rotation Speed (N): Calculated as $$N = \frac{Vc \times 1000}{\pi \times 25}$$
- Coolant: High-pressure internal cooling (Min 1.5 MPa) is mandatory for 5D depth.
SP Series U-Drill: Advantages & Considerations
- Uses 4-edge SPMG square inserts (Higher cost-efficiency).
- Superior stability for Blind Hole Machining.
- Thicker tool core provides higher rigidity than WC drills for 5D reach.
- Higher power requirement compared to trigon drills.
- Strict requirement for internal coolant pressure to flush chips.
Verified Customer Feedback
"Solid for 5D bores"
"I was worried about vibration at 125mm depth, but this body is incredibly rigid. Clean blind holes every time."
- Robert J. (USA)
"BEYOND Quality"
"Excellent price-to-performance ratio. Much better bottom finish for blind holes than WC types."
- Jurgen S. (Germany)
"Fast shipping to Japan. The 20CrMnTi steel feels very high quality."
- Kenji T. (Japan)
"Good chip evacuation with proper coolant pressure."
- Ahmed R. (UAE)
"Five stars. Solid tool body."
- Steve L. (Australia)
Technical Q&A
Q: Is a pilot hole required for 5D reach?
A: For 5D (125mm), we highly recommend starting with a 1D or 2D short U-drill to guide the tool for maximum straightness.
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 models.
Q: What happens if I don't use internal coolant?
A: For 5D depths, chips will pack and break the inserts. Internal cooling is mandatory for safety and performance.
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 more cutting edges but the tool core is 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.