BEYOND SP C32-5D-SD28.5-SP09 Indexable U-Drill | 28.5mm 5D CNC Deep Hole Drill Body
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BEYOND SP C32-5D-SD28.5-SP09
28.5mm 5D Indexable U-Drill | Professional Blind Hole Boring Specialist
High-Rigidity 28.5mm Deep Hole Drilling
The BEYOND SP C32-5D-SD28.5-SP09 is a premium indexable insert drill engineered for extreme stability in deep hole boring. With a 28.5mm cutting diameter and a 5D depth ratio, this tool is the industry standard for blind hole machining. Featuring internal cooling and a specialized spiral flute, it ensures high-speed efficiency in CNC lathe operations.
What Does the Model Code Mean?
Technical Data & Size Conversion
| Specification | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Cutting Diameter (SD) | 28.5 mm | 1.122" |
| Shank Diameter (C) | 32.0 mm | 1.259" |
| Max Drilling Depth (5D) | 142.5 mm | 5.610" |
| Overall Length (L) | 218 mm | 8.582" |
20CrMnTi Alloy & High-Efficiency Spiral Flute
Premium 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. Its flexible core prevents catastrophic failure during shallow hole drilling and extreme 5D penetrations.
Advanced Spiral Flute (U-Groove): The spiral flute geometry is designed with extra-large chip slots. This ensures that even at 142.5mm depths, metal chips are effectively flushed out by the internal cooling holes, preventing chip packing and protecting the carbide inserts.
Recommended Cutting Parameters (5D 28.5mm)
Optimize your CNC machining with these baseline settings for 45# Steel:
- Cutting Speed (Vc): 110 - 160 m/min
- Feed Rate (f): 0.07 - 0.14 mm/rev
- Rotation Speed (N): Calculated as $$N = \frac{Vc \times 1000}{\pi \times 28.5}$$
- Requirement: High-pressure internal cooling (Min 1.5 MPa) is mandatory for 5D.
SP Type U-Drill: Pros and Cons
- Uses SPMG square inserts with 4 usable cutting edges (Higher economy).
- Superior hole verticality and accuracy in blind hole boring.
- Thicker tool core provides higher rigidity than WC drills for deep reach.
- Requires higher spindle power/torque for 28.5mm diameter.
- Absolute reliance on internal coolant systems for chip flushing.
Verified Customer Feedback
"Solid for Blind Holes"
"I use this for blind hole machining in carbon steel. The SP series provides a much flatter bottom than WC."
- Mike T. (USA)
"Rigid 5D Performance"
"Surprised by the stability at 140mm depth. Chip evacuation is smooth with good coolant pressure."
- Jurgen R. (Germany)
"Fast delivery and high build quality. Fits perfectly in my CNC lathe."
- Kenji A. (Japan)
"Excellent price-to-performance ratio."
- Ahmed S. (UAE)
"Highly durable tool body. Survived several hard runs without issues."
- Steve B. (Australia)
Technical Q&A
Q: Is a pilot hole required?
A: For 5D depths, we recommend starting with a short 2D U-drill starter hole to ensure the 5D tool enters perfectly straight and minimizes vibration.
Q: Can I use this for through holes?
A: Yes, but SP is specifically optimized for blind holes. For exclusively through-hole work, the WC series may be more cost-effective due to insert geometry.
Q: What material are the cooling holes?
A: They are precision-drilled internal passages designed for high-pressure coolant or air.
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 6 edges but the body core is thinner, making it slightly less rigid than SP for extreme depths.
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.