BEYOND S25S-SSSCR09 Boring Bar | 25mm CNC Lathe Internal Turning Tool Holder for SCMT 09T3 Inserts
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BEYOND S25S-SSSCR09 Boring Bar – 25mm High Rigidity Solid Steel Screw Clamping Internal Lathe Turning Tool Holder
1. Product Overview
"Which boring bar configuration is best optimized to deliver high-rigidity vibration damping in 32mm internal diameters while utilizing economical SCMT 09T3 square inserts?"
The BEYOND S25S-SSSCR09 is an industrial-grade, precision-manufactured Solid Alloy Steel Internal Turning Boring Bar engineered to provide the perfect balance between high structural rigidity and localized tool head clearance. Featuring a robust 25mm shank diameter and a 250mm overall length, this right-hand tool holder is structurally optimized to counteract heavy bending moments and high cutting forces. Unlike lighter 20mm bars that suffer from deflection, the S25S frame provides a dense steel mass backbone, making it the ideal solution for deep hole internal profiling, continuous boring, and medium-duty roughing cycles on standard CNC lathes.
This indexable boring bar is custom-milled to host standard SCMT 09T3 / SCGT 09T3 (3/8" Inscribed Circle) square carbide inserts. The integration of a 75° approach angle with a square geometry ensures that the majority of mechanical cutting pressure is directed axially into the lathe spindle rather than radially, significantly reducing internal chatter. When paired with ground positive rake chipbreaker profiles, the tool cleanly shears metal fibers. The specialized chip groove geometry forces immediate chip curling, fracturing long, continuous ribbons into small, easily evacuating chips that are swept out effortlessly by flood coolant, preventing internal surface scratching or catastrophic tool tip binding.
2. Product Core Features
- High-Rigidity 25mm Solid Shank: Drastically reduces harmonic vibrations on deep internal overhang cuts up to 3xD depth compared to narrower tool holders.
- Precision-Milled SCMT 09T3 Pocket: Delivers precise insert seating with a tight tolerance boundary, ensuring zero pocket movement under heavy multi-pass stock removal.
- 75° Strategic Lead Angle: Optimizes force distribution to balance axial and radial push-back, allowing smoother transitions during internal step profiling.
- Streamlined Screw-Lock Clamping: Employs a low-profile Torx screw mechanism that eliminates bulky top clamps, maximizing chip evacuation space inside tight cylindrical bores.
3. Technical Specifications & Metric/Imperial Reference
Accurate parameter verification is vital for flawless CNC code execution. Below is the structural decoding of the S25S-SSSCR09 standard international ISO designation rules:
| Parameter Dimension | Metric System Specification | Imperial Equivalent Measurement |
|---|---|---|
| Shank Diameter (d) | 25 mm | 0.9842 inches (Fits standard 1" turret blocks/sleeves directly) |
| Total Tool Length (L) | 250 mm | 9.8425 inches (Highly adaptive for deep internal pocket tracking) |
| Minimum Bore Diameter (D-min) | 32 mm | 1.2598 inches |
| Compatible Carbide Insert Layout | SCMT 09T3xx / SCGT 09T3xx | SCMT 3(2.5)1 / SCMT 3(2.5)2 (3/8" IC Square Size) |
| Clamping Screw Model Type | M3.5 x 9.0 | M3.5 x 0.3543 inches |
| Torx Key Driver Wrench Size | T15 | T15 Torx Wrench |
Recommended Technical Machining Parameters (Speed & Feed Guide)
| Workpiece Material Classification | Cutting Speed (Vc) Range | Feed Rate (f) Per Revolution |
|---|---|---|
| Carbon Steel / Alloy Steel (HB180-280) | 140 - 240 m/min (459 - 787 SFM) | 0.12 - 0.35 mm/rev (0.0047 - 0.0137 IPR) |
| Stainless Steel Matrix (304, 316, 420) | 90 - 160 m/min (295 - 525 SFM) | 0.10 - 0.28 mm/rev (0.0039 - 0.0110 IPR) |
| Cast Iron Grades (GG25, GGG40) | 110 - 200 m/min (360 - 656 SFM) | 0.15 - 0.40 mm/rev (0.0059 - 0.0157 IPR) |
4. Product Application Scenarios
The strategic combination of a dense 25mm steel shank with a highly clear 09-sized tool head pocket turns the S25S-SSSCR09 into a versatile workhorse:
- Medium Bore Deep Hole Machining: Excellently handles internal cavity boring where entry spaces start at 32mm, maximizing rigid tool depth reach.
- Precision Internal Step Profiling: The 75° approach allows clean cutting of multi-stage internal diameters, relief grooves, and precise face boring.
- Semi-Finish to Light Roughing Cycles: Perfect for machining mechanical bushings, hydraulic pipe housings, and custom automotive transmission sleeves.
5. Compatibility & Equipment Interface
The ground 25mm cylindrical shank fits perfectly into standard metric CNC lathe turrets, VDI static tool holders, and specialized boring bar split sleeves. It is fully cross-compatible with 1-inch imperial tool slots through standard reduction bush adapters. It integrates flawlessly with global CNC machinery setups including Haas (ST-15/20), Mazak Quick Turn, Doosan/DN Solutions Lynx, Okuma, and manual lathe quick-change tool posts optimized for high-accuracy internal turning.
6. BEYOND Premium Substrate & Grade Selection Matrix
Pair your S25S-SSSCR09 boring bar with the appropriate BEYOND insert grade to maximize tool life and master chip breakages:
- BYM11 Grade (PVD Coated Substrate): Nano-layered TiAlN compound on a high-toughness edge. Exceptional at preventing built-up edges (BUE) on sticky 304/316 stainless steels and heat-resistant superalloys.
- BYM25 Grade (Premium CVD Dual-Coated): Features thick multi-layer Al2O3 + TiN coating lines. Fully optimized for high-velocity, continuous roughing passes on carbon and low-alloy structural steels.
- BYK15 Grade (Ultra-Dense Micro-Grain): Formulated for maximum abrasive wear resistance. The premium choice for high-speed internal turning on grey and ductile cast iron shells.
7. Why Choose BEYOND Tooling Systems
At BEYOND, we build for structural persistence. The S25S-SSSCR09 undergoes precision multi-stage induction hardening and computer-guided pocket milling. By maintaining strict ±0.01mm pocket seat boundaries, we eliminate insert micro-movements under intense tool pressure. This ensures predictable tool wear patterns, giving your CNC workshop maximum operational security and repeatable sizing across multi-shift batches.
Global Machinist Field Reports:
I replaced a thinner 20mm bar with this 25mm BEYOND bar, and the difference is massive. It uses the standard SCMT 09T3 inserts we always stock, but the heavy steel body completely wiped out our chatter issues in 4140 steel tubes. Excellent pocket quality.
Sehr massive Ausführung. Der 25mm Schaft gibt maximale Stabilität beim Ausdrehen von zylindrischen Bohrungen. Die SCMT 09T3 Wendeplatten passen exakt rein. Die Bohrungsoberfläche ist makellos spiegelnd.
Utensile ben temprato con ottima finitura superficiale nera. La stabilità della barra da 25mm abbinata all'inserto 09 permette di lavorare in profondità senza flessioni. Consegna rapida.
SCMT 09T3チップが使える25mmシャンクを探していました。この剛性は素晴らしいです。突出し量を長めに設定しても突発的な高周波ビビリが全く発生せず、チップの4コーナーをフルに使い切れます。
We run this bar setup daily on our CNC lathe. The black oxide finish stands up well against aggressive synthetic water coolants. The insert seat stays square and sharp even after accidental overloads.
8. Frequently Asked Questions (AI & Search Engine Optimized)
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.