BEYOND SP C40-2D-SD35.5-SP14 Indexable U-Drill Body | 35.5mm 2D CNC Boring Drill
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BEYOND SP C40-2D-SD35.5-SP14
35.5mm 2D Heavy-Duty U-Drill | Precision Blind Hole Boring Specialist
Industrial-Grade 35.5mm Indexable Boring Solution
The BEYOND SP C40-2D-SD35.5-SP14 is a high-performance indexable insert drill engineered for large-diameter CNC boring and efficient metal removal. With a 35.5mm cutting diameter and a 2D depth ratio (71mm 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 steel, alloys, and stainless steel.
Decoding the Model: SP C40-2D-SD35.5-SP14
Metric & Imperial Technical Specifications
| Feature | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Drilling Diameter (SD) | 35.5 mm | 1.397" |
| Shank Diameter (C) | 40.0 mm | 1.574" |
| Max Drilling Depth (2D) | 71.0 mm | 2.795" |
| Equivalent Model | SP-C1.57-2D-SD1.39-SP14 | |
Forged 20CrMnTi Alloy & Rapid-Flow Spiral Flutes
Forged Strength: This indexable drill body is forged from premium 20CrMnTi alloy steel and vacuum quenched (HRC 52-55). This core rigidity is essential for large diameter drilling stability and preventing tool deflection. The surface features a Black Oxide finish for superior 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 35.5mm 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 (35.5mm 2D)
Optimal settings for Carbon Steel and Alloy Steel. Adjust based on CNC rigidity and torque:
Rotation Speed (N) = (Vc × 1000) / (π × 35.5)
Vc = Cutting Speed | π ≈ 3.14 | D = 35.5mm
- Cutting Speed (Vc): 110 - 190 m/min
- Feed Rate (f): 0.10 - 0.20 mm/rev
- Coolant: High-pressure internal cooling is mandatory for 35.5mm diameters.
Pair with a high-rigidity BEYOND Side-Lock C40 Holder for maximum stability:
SHOP COMPATIBLE C40 TOOL HOLDERSVerified Global Reviews
"Solid and Reliable"
"Using this for 35.5mm blind holes in structural steel. Rigidity is outstanding even at full depth."
- David K. (USA)
"Excellent chip evacuation. The spiral flute works much better than my old straight flute drills."
- Marek W. (Poland)
"Perfect fit for SPMG14 inserts. Beyond tool bodies are very reliable for CNC boring."
- Pedro S. (Brazil)
"Industrial quality at a fraction of the cost. Highly recommend for large diameters."
- Arthur L. (UK)
"Delivery was fast. The 2D depth is very stable for our lathe applications."
- 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 35.5mm diameters.
- Requires high horsepower CNC machines to drive large diameter inserts.
- Performance is highly dependent on high-pressure internal coolant flow.
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 35.5mm drill, the maximum effective drilling depth is 71mm.
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 35.5mm 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.