BEYOND SP C40-2D-SD39-SP14 Indexable U-Drill Body | 39mm 2D CNC Boring Drill
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BEYOND SP C40-2D-SD39-SP14
39mm 2D Heavy-Duty U-Drill | High-Precision Blind Hole Specialist
Industrial-Grade 39mm Indexable Boring Solution
The BEYOND SP C40-2D-SD39-SP14 is a professional-grade indexable insert drill engineered for high-performance CNC boring and large-diameter metal removal. With a 39mm cutting diameter and a 2D depth ratio (78mm reach), this tool is the industry benchmark for blind hole machining. Featuring internal cooling and a precision-engineered spiral flute, it ensures rapid chip evacuation and superior surface finish in steel, alloys, and stainless steel.
Decoding the Model: SP C40-2D-SD39-SP14
Metric & Imperial Technical Specifications
| Feature | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Drilling Diameter (SD) | 39.0 mm | 1.535" |
| Shank Diameter (C) | 40.0 mm | 1.574" |
| Max Drilling Depth (2D) | 78.0 mm | 3.070" |
| Equivalent Model | SP-C1.57-2D-SD1.53-SP14 | |
Premium 20CrMnTi Alloy & Rapid-Flow Chip Flutes
Forged Strength: This indexable drill body is forged from premium 20CrMnTi alloy steel and vacuum quenched (HRC 52-55). This provides the core rigidity required for large diameter drilling stability and prevents deflection. The surface features a Black Oxide finish for thermal wear resistance during rapid hole boring.
Advanced Slot Geometry: The U-drill features an optimized spiral flute (U-groove) specifically engineered to evacuate the high volume of chips produced by a 39mm bore. Integrated internal cooling holes allow high-pressure coolant to flush metal chips directly out of the cutting zone, essential for successful blind hole machining.
Recommended Cutting Parameters (39mm 2D)
Optimal settings for Carbon Steel and Alloy Steel. Adjust based on CNC rigidity:
Rotation Speed (N) = (Vc × 1000) / (π × 39)
Vc = Cutting Speed | π ≈ 3.14 | D = 39mm
- Cutting Speed (Vc): 110 - 190 m/min
- Feed Rate (f): 0.10 - 0.20 mm/rev
- Coolant: Center-through internal cooling is mandatory for 39mm bores.
For maximum rigidity, use a BEYOND Side-Lock C40 Holder:
SHOP COMPATIBLE C40 TOOL HOLDERSVerified Global Reviews
"Industrial Quality"
"I use this for 39mm blind holes in 1045 steel. The flat bottom finish is perfect. No vibration."
- David K. (USA)
"Chip flow is better than expected for a 39mm diameter. Very stable."
- Marek W. (Poland)
"Matches SPMG14 inserts perfectly. Zero play. BEYOND tool bodies are solid."
- Pedro S. (Brazil)
"Great industrial value. Delivered fast to UK."
- Arthur L. (UK)
"Perfect for our CNC lathe. 39mm bore finish is smooth."
- Y. Watanabe (Japan)
SP Series Indexable Drill: Advantages & Considerations
- Uses 4-edge SPMG square inserts for lower cost-per-edge.
- Optimized for Blind Hole Machining (Flatter hole bottom profile).
- Reinforced body core provides maximum rigidity for 39mm diameters.
- Requires high horsepower CNC machines compared to smaller sizes.
- Performance is highly dependent on 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 SPMG14 inserts?
A: It is designed for standard SPMG140512 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 39mm drill, the maximum effective drilling depth is 78mm.
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 39mm tasks.
Need Help With BEYOND Inserts?
Looking for a BEYOND equivalent, alternative grade, or sample catalog? Our CNC specialists have helped 50+ manufacturers in aerospace, automotive, and medical machining source the right tooling at 30–50% lower cost than OEM prices.
This BEYOND insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
Technical FAQ & Buying Guide
When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.
For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.
Check the product listing for the selling unit, pack quantity and included components. If it is unclear whether the price is per piece or per pack, or whether a tool body and inserts are sold separately, contact us before purchasing.
Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.
Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.
According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.