BEYOND SP C32-5D-SD31.5-SP09 Indexable U-Drill | 31.5mm CNC Deep Hole Drill Body
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BEYOND SP C32-5D-SD31.5-SP09
31.5mm 5D Indexable U-Drill | Professional CNC Deep Hole Boring Body
Industrial-Grade 31.5mm Deep Hole Drilling Specialist
The BEYOND SP C32-5D-SD31.5-SP09 is a high-performance indexable insert drill engineered for heavy-duty metal removal. With its 31.5mm cutting diameter and a massive 5D depth ratio, this fast hole U-drill is the ultimate solution for deep hole boring in industrial CNC applications. Utilizing internal cooling technology, it maintains stability during high-speed drilling in carbon steel, alloy, and stainless steel.
What Does the Model Code Mean?
Technical Data & Size Conversion
| Specification | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Cutting Diameter (SD) | 31.5 mm | 1.240" |
| Shank Diameter (C) | 32.0 mm | 1.259" |
| Max Drilling Depth (5D) | 157.5 mm | 6.200" |
| Overall Length (L) | 233 mm | 9.173" |
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 157.5mm depths, metal chips are effectively flushed out by the internal cooling holes, preventing chip packing and protecting the carbide inserts.
Recommended Cutting Parameters (5D 31.5mm)
Optimize your CNC machining with these baseline settings for 45# Steel:
- Cutting Speed (Vc): 100 - 150 m/min
- Feed Rate (f): 0.07 - 0.13 mm/rev
- Rotation Speed (N): Calculated as $$N = \frac{Vc \times 1000}{\pi \times 31.5}$$
- 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 deep hole boring.
- Thicker tool core provides higher rigidity than WC drills.
- Requires higher spindle power/torque for 31.5mm diameter.
- Absolute reliance on internal coolant systems.
Verified Customer Feedback
"Solid Deep Hole Performance"
"Drilling 31.5mm in structural steel was easy. The 5D length stays rigid without vibration."
- Mike T. (USA)
"Efficient Chip Flow"
"Polished flutes work wonders. No chip packing even at 150mm depth."
- Jurgen R. (Germany)
"Perfect fit for my CNC setup."
- Kenji A. (Japan)
"Best price for 5D reach."
- Ahmed S. (UAE)
"Very tough drill body, survived a crash with minimal damage."
- 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.
Q: What is the benefit of the Side-Lock (C32) shank?
A: It prevents the tool from rotating in the holder during high-torque 31.5mm cuts, ensuring operator safety.
Q: Can this handle intermittent cuts?
A: Yes, the 20CrMnTi core is tough enough for interrupted drilling in CNC lathes.
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.