BEYOND SP C25-5D-SD24.5-SP07 Indexable U-Drill | 24.5mm 5D CNC Deep Hole Drill Body
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BEYOND SP C25-5D-SD24.5-SP07
24.5mm 5D Indexable U-Drill | Precision Blind Hole Boring Specialist
Industrial 24.5mm Deep Hole Boring Specialist
The BEYOND SP C25-5D-SD24.5-SP07 is a high-rigidity indexable insert drill engineered for extreme stability in deep hole boring. With a 24.5mm cutting diameter and a 5D depth ratio (122.5mm reach), this tool is the industry choice for blind hole machining. Featuring internal cooling and a specialized spiral flute, it ensures high-speed efficiency and superior surface finish on CNC lathes.
What Does the Model Code Mean?
Metric & Imperial Technical Specifications
| Feature | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Drilling Diameter (SD) | 24.5 mm | 0.964" |
| Shank Diameter (C) | 25.0 mm | 0.984" |
| Drilling Depth (5D) | 122.5 mm | 4.822" |
| Imperial Ref. Model | SP-C1.0-5D-SD0.964-SP07 | |
20CrMnTi Alloy & High-Efficiency 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 incredible wear resistance while the core remains shock-resistant to withstand interrupted cuts during shallow hole drilling or deep boring.
Optimized Spiral Flute (U-Groove): The specialized U-groove geometry features wide chip pockets. Combined with dual internal cooling holes, it allows high-pressure coolant to flush metal chips out of 122.5mm deep bores instantly, preventing chip packing and protecting the carbide inserts from heat failure.
Recommended Cutting Parameters (5D 24.5mm)
Suggested for Carbon Steel (HB < 250). Adjust based on machine rigidity:
- Cutting Speed (Vc): 120 - 180 m/min
- Feed Rate (f): 0.05 - 0.11 mm/rev
- Rotation Speed (N): Calculated as $$N = \frac{Vc \times 1000}{\pi \times 24.5}$$
- Coolant: High-pressure internal cooling (Min 1.5 MPa) is mandatory for 5D.
SP Series U-Drill: Advantages & Considerations
- Uses 4-edge SPMG square inserts (Higher cost-efficiency).
- Exceptional stability for Blind Hole Machining.
- Thicker tool core provides higher rigidity than WC drills for 5D reach.
- Higher power requirement compared to trigon drills.
- Requires stable and high coolant pressure for chip flushing at depth.
Verified Customer Feedback
"Solid Deep Bores"
"Running this on our CNC lathe for 115mm deep blind holes. Zero vibration and perfect diameter control."
- Mark T. (USA)"Superior Rigidity"
"The 20CrMnTi steel is very tough. Much better bottom finish than the WC drills we used to use."
- Hans B. (Germany)"Excellent price-to-performance ratio. BEYOND is now our primary supplier."
- Kenji Y. (Japan)
"Fast shipping to Italy. Tool body is perfectly balanced."
- Alessandro P. (Italy)
"Reliable tool for 24.5mm deep boring."
- Liam G. (UK)
Technical Q&A
Q: Can I use this for through holes?
A: Yes, but SP is specifically optimized for blind holes. For pure through-hole high-volume production, a WC drill might be slightly faster, but SP is more versatile for rigidity.
Q: Is a pilot hole required?
A: For 5D (122.5mm), we highly recommend starting with a short 2D U-drill to ensure the entry is perfectly centered before going deep.
Q: What happens if coolant pressure is low?
A: At 5D depth, low pressure will lead to chip clogging, which can break the drill body. Ensure your internal cooling system is clear.
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 for 5D depths.
WC Series (Trigon): Primarily used for Through Hole applications. WC inserts offer 6 edges but the body core is thinner, making it 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.