BEYOND SP C40-3D-SD39.5-SP11 Indexable U-Drill Body | 39.5mm 3D CNC Boring Drill
Free shipping on all orders.
Check compatibility: Confirm the model and dimensions before ordering.
Need help choosing? Contact us before ordering.
💰 Bulk savings 2-9 pcs · 6% OFF | 10+ pcs · 12% OFF
BEYOND SP C40-3D-SD39.5-SP11
39.5mm 3D Indexable U-Drill | The Blind Hole Machining Expert
High-Precision 39.5mm CNC Boring Solution
The BEYOND SP C40-3D-SD39.5-SP11 is an industrial-grade indexable insert drill designed for heavy-duty large diameter boring. With a 39.5mm cutting diameter and a 3D depth ratio (118.5mm reach), this tool excels in blind hole machining where a flat bottom and high wall accuracy are required. Engineered for the modern CNC shop, it features integrated internal cooling to handle the heat of deep-hole production.
Model Breakdown: SP C40-3D-SD39.5-SP11
Technical Specifications: Metric vs. Imperial
| Parameter | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Drilling Diameter (SD) | 39.5 mm | 1.555" |
| Shank Diameter (C) | 40.0 mm | 1.575" |
| Max Depth (3D) | 118.5 mm | 4.665" |
| Equivalent Model | SP-C1.575-3D-SD1.555-SP11 | |
Premium 20CrMnTi Construction & Chip Flow
Anti-Vibration Body: Built from high-strength 20CrMnTi alloy steel and quenched to HRC 52-55, this tool body provides the rigid foundation needed for large diameter drilling without chatter. The Black Oxide finish prevents surface galling and extends tool life.
Optimized Chip Flutes: The wide-opening spiral flute design, paired with dual internal cooling holes, creates a high-velocity "flush" effect. This ensures that chips are discharged immediately from the 39.5mm bore, preventing insert breakage caused by chip recutting.
Recommended Cutting Parameters (39.5mm)
For Carbon Steel & Alloy Steel production. Use this formula for RPM settings:
Rotation Speed (N) = (Vc × 1000) / (π × 39.5)
Vc = Cutting Speed | π ≈ 3.14 | D = 39.5mm
- Cutting Speed (Vc): 110 - 180 m/min
- Feed Rate (f): 0.08 - 0.16 mm/rev
- Coolant Strategy: Continuous high-pressure internal cooling is required.
Maximize rigidity with a dedicated C40 side-lock holder:
VIEW COMPATIBLE TOOL HOLDERSGlobal Customer Testimonials
"Top Tier 39.5mm Body"
"Perfect for our blind hole requirements. The tool body doesn't flex, which keeps the hole perfectly straight."
- Robert H. (Germany)
"Impressive Flow"
"Internal coolant is powerful. Even at 3D depth, the chips come out fast and clean."
- Marek W. (Poland)
"Using BEYOND for 6 months. Best price-to-performance for indexable drills."
- Pedro S. (Brazil)
"Solid industrial tool. Arrived in London in less than 10 days."
- Arthur L. (UK)
SP Series Performance Profile
- 4 cutting edges per insert for cost efficiency.
- Optimized for Blind Hole Machining (Flatter bottom profile).
- High core rigidity for large diameter boring torque.
- Requires high horsepower CNC machines for 39.5mm.
- Performance drops if internal coolant pressure is inconsistent.
Technical Q&A
Q: Why use SP for blind holes instead of WC?
A: The SP U-drill uses square inserts which produce a flatter hole bottom. WC (Trigon) drills are better for through holes but leave a conical shape at the bottom of blind bores.
Q: What inserts should I use with this?
A: This body is precision-machined for SPMG110408 inserts. We recommend BEYOND series inserts for the most rigid fit.
Quick Tip: SP vs. WC for 39.5mm Holes
Choose SP Series for precision Blind Bores where bottom flatness is critical. The square insert design provides the highest core strength for heavy production boring. Choose WC Series for rapid Through Hole drilling where cutting edge count is more important than hole bottom geometry.
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.