BEYOND SP C32-2D-SD31-SP09 Indexable U-Drill Body | 31mm 2D CNC Boring Drill
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BEYOND SP C32-2D-SD31-SP09
31mm 2D Heavy-Duty U-Drill | The Industry Standard for Blind Hole Boring
High-Performance 31mm Indexable Boring Solution
The BEYOND SP C32-2D-SD31-SP09 is a high-performance indexable insert drill engineered for large-diameter CNC boring and high-speed metal removal. With a 31mm cutting diameter and a 2D depth ratio (62mm reach), this tool is the professional choice for blind hole machining. Featuring internal cooling and a precision-engineered spiral flute, it ensures rapid chip evacuation and superior surface finish in carbon steel, alloy steel, and stainless steel.
Decoding the Model: SP C32-2D-SD31-SP09
Metric & Imperial Technical Specifications
| Feature | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Drilling Diameter (SD) | 31.0 mm | 1.220" |
| Shank Diameter (C) | 32.0 mm | 1.259" |
| Max Drilling Depth (2D) | 62.0 mm | 2.441" |
| Equivalent Model | SP-C1.25-2D-SD1.22-SP09 | |
Premium 20CrMnTi Alloy & High-Efficiency Flute Geometry
Industrial Build: Our U-drill body is forged from superior 20CrMnTi alloy steel and vacuum quenched (HRC 52-55). This core rigidity is essential for large diameter drilling stability and preventing tool deflection during heavy-duty cycles. The surface is treated with a Black Oxide finish for superior thermal wear resistance during rapid hole boring.
Advanced Slot Geometry: The tool features an optimized spiral flute (U-groove) specifically engineered to evacuate the high volume of chips produced by a 31mm bore. Integrated internal cooling holes allow high-pressure coolant to flush metal chips directly out of the cutting zone—essential for blind hole machining to prevent chip re-cutting.
Recommended Cutting Parameters (31mm 2D)
Optimal settings for General Steel. Adjust based on CNC rigidity and material grade:
Rotation Speed (N) = (Vc × 1000) / (π × 31)
- Cutting Speed (Vc): 100 - 180 m/min
- Feed Rate (f): 0.08 - 0.18 mm/rev
- Coolant: High-pressure internal cooling is mandatory.
Maximize precision with our high-rigidity BEYOND Side-Lock C32 Holder:
SHOP COMPATIBLE C32 TOOL HOLDERSVerified Customer Feedback
"Solid industrial tool"
"Using this for 31mm blind holes in alloy steel. The flat bottom geometry is perfect for my assembly needs."
- David K. (USA)
"Top quality from Beyond. The chip evacuation is fantastic and the body is very balanced."
- Marek W. (Poland)
"Fits SPMG09 inserts perfectly. Robust tool for high production runs."
- Pedro S. (Brazil)
"Fast shipping. Professional grade tooling."
- Arthur L. (UK)
"Solid 2D depth stability. No vibration at high feed."
- Kenji S. (Japan)
SP Series Indexable Drill: Advantages & Considerations
- Uses 4-edge SPMG square inserts for lower cost-per-edge.
- Optimized for Blind Hole Machining (Creates a flatter hole bottom).
- Stronger body core design reduces vibration in 31mm boring tasks.
- Higher power consumption than trigon-style drills.
- Performance drops significantly without high-pressure internal coolant.
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 SPMG09 inserts?
A: It is designed for standard SPMG090408 carbide inserts. Using BEYOND brand inserts is recommended for the best fit.
Q: What is the maximum depth for this 2D drill?
A: The 2D indicates 2x the diameter. For a 31mm drill, the maximum effective drilling depth is 62mm.
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.
WC Series (Trigon): Primarily used for Through Hole applications. WC inserts offer more edges but the body core is thinner, making it less rigid for 31mm 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.