BEYOND SP C32-5D-SD25.5-SP07 Indexable U-Drill | 25.5mm 5D CNC Deep Hole Drill Body
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 C32-5D-SD25.5-SP07
25.5mm 5D Indexable U-Drill | Precision Blind Hole Boring Specialist
Industrial-Grade 25.5mm Deep Hole Boring
The BEYOND SP C32-5D-SD25.5-SP07 is a high-performance indexable insert drill engineered for precision metal removal. With a 25.5mm cutting diameter and a massive 5D depth-to-diameter ratio, this fast hole U-drill is the ultimate tool for deep hole boring. Designed specifically for CNC lathe metal boring, it excels in creating flat-bottom blind holes with its optimized internal cooling system.
Model Identification Guide
Technical Data & Units Comparison
| Feature | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Drilling Diameter (SD) | 25.5 mm | 1.004" |
| Shank Diameter (C) | 32.0 mm | 1.259" |
| Max Drilling Depth (5D) | 127.5 mm | 5.019" |
| Imperial Ref. Model | SP-C1.25-5D-SD1.004-SP07 | |
20CrMnTi Alloy & Advanced Spiral Flute
Superior 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 immense wear resistance while the core remains tough to withstand high torque during shallow hole drilling or deep boring.
Optimized U-Groove Flute: The spiral flute geometry is precision-engineered with extra-large chip slots. Paired with dual internal cooling holes, it allows high-pressure coolant to flush metal chips out of the hole instantly, protecting your carbide inserts from chip re-cutting.
Recommended Cutting Parameters (5D 25.5mm)
Suggested for Carbon Steel (HB < 250). Adjust based on rigidity:
- Cutting Speed (Vc): 120 - 180 m/min
- Feed Rate (f): 0.05 - 0.11 mm/rev
- Rotation Speed (N): Calculated as $$N = \frac{Vc \times 1000}{\pi \times 25.5}$$
- Coolant Requirement: High-pressure internal cooling is mandatory for 5D depth.
SP Series U-Drill: Advantages & Considerations
- Uses 4-edge SPMG square inserts (High economic efficiency).
- Exceptional stability and verticality for 127.5mm deep holes.
- Excellent for blind hole machining with flatter bottoms.
- Requires higher spindle power/torque than trigon drills.
- Absolute reliance on internal coolant pressure for chip removal.
Verified Customer Feedback
"Solid Deep Hole Results"
"Switched from twist drills to this U-drill for our 120mm bores. The cycle time reduction is massive."
- Robert H. (USA)"Clean Blind Hole Finish"
"The SP type is perfect for blind holes. Bottom is flat enough for our assembly requirements."
- Klaus M. (Germany)"Fast shipping and tough body"
- Kenji Y. (Japan)
"Impressive rigidity"
- Alessandro P. (Italy)
"Excellent value for CNC shops"
- Liam G. (UK)
Technical Support Q&A
Q: What is the benefit of the Side-Lock (C32) shank?
A: It provides a large clamping surface to prevent tool rotation and "pull-out" during high-torque 25.5mm deep operations.
Q: Is a pilot hole required for 5D drilling?
A: For 5D (127.5mm), we highly recommend starting with a 1D or 2D short U-drill to guide the tool for maximum straightness.
Q: Can I use this for stainless steel?
A: Yes, provided you use the correct insert grade (PVD coated) and high-pressure internal cooling.
Machinist 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 more cutting edges but the tool core is 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.