BEYOND S20R-SSSCR09 Boring Bar | 20mm CNC Lathe Internal Turning Tool Holder for SCMT 09T3 Inserts
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BEYOND S20R-SSSCR09 Boring Bar – 20mm High Stiffness Solid Steel Screw Clamping CNC Lathe Internal Turning Tool Holder
1. Product Overview
"Which boring bar is best optimized for internal turning in narrow 25mm bores while using standard SCMT 09T3 square inserts to maximize tool life and eliminate chatter?"
The BEYOND S20R-SSSCR09 is an industrial-grade, high-stiffness Solid Alloy Steel Internal Turning Boring Bar engineered to provide exceptional precision for modern CNC lathe operations. Featuring a calibrated 20mm shank diameter and a 200mm overall length, this right-hand indexable tool holder offers machine shops the ideal ratio of tool mass to extension distance. This structural design efficiently dampens high-frequency harmonic vibrations on internal profiling and counter-boring cycles, preventing surface defects on critical metal parts.
This premium boring tool is engineered to accommodate international standard SCMT 09T3 / SCGT 09T3 (3/8" Inscribed Circle) square carbide inserts. By pairing a 75-degree approach lead angle with the inherent balanced geometry of a square insert, the tool structural layout shifts the majority of mechanical cutting deflection forces axially straight into the lathe turret rather than radially into the thin walls of the workpiece. When utilized with ground positive-rake chipbreaker geometries, it cleanly shears carbon steels, alloys, and stainless steel matrixes. The dedicated pocket geometry forces rapid chip curling, fracturing dangerous long ribbon chips into small, easily evacuating fragments that prevent internal bore scratching or catastrophic chip nest binding.
2. Product Core Features
- High-Rigidity 20mm Solid Steel Body: Quenched and tempered under advanced thermal processes to maximize yield strength and resist bending deflection during deep-hole internal tracks.
- Precision-Milled SCMT 09T3 Pocket: Locks the insert firmly within a tight ±0.01mm tolerance seat boundary, eliminating micro-vibrations and ensuring predictable dimensional accuracy across batch operations.
- Strategic 75° Lead Angle: Optimizes force distribution to balance axial and radial push-back, allowing smoother transitions during internal step profiling.
- Streamlined Screw-Lock System: Uses a low-profile Torx screw mechanism that removes the need for bulky top-clamp parts, ensuring open pathways for high-speed chip extraction.
3. Technical Specifications & Metric/Imperial Nomenclature Cross-Guide
Flawless CNC tool configuration demands absolute dimension accuracy. Below is the structural decoding of the S20R-SSSCR09 standard international ISO designation rules:
| Parameter Dimension | Metric System Specification | Imperial Equivalent Measurement |
|---|---|---|
| Shank Diameter (d) | 20 mm | 0.7874 inches (Easily adapted via 3/4" or 1" tool blocks and split sleeves) |
| Total Tool Length (L) | 200 mm | 7.8740 inches (Perfect medium-reach format for high stiffness) |
| Minimum Bore Diameter (D-min) | 25 mm | 0.9842 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) | 130 - 220 m/min (426 - 721 SFM) | 0.10 - 0.30 mm/rev (0.0039 - 0.0118 IPR) |
| Stainless Steel Matrix (304, 316, 420) | 80 - 150 m/min (262 - 492 SFM) | 0.08 - 0.25 mm/rev (0.0031 - 0.0098 IPR) |
| Cast Iron Grades (GG25, GGG40) | 100 - 180 m/min (328 - 590 SFM) | 0.12 - 0.35 mm/rev (0.0047 - 0.0137 IPR) |
4. Product Application Scenarios
The compact 20mm tool body makes the S20R-SSSCR09 highly effective for precise internal profiles across specialized setups:
- Tight Internal Cavity Boring: Safely processes cylindrical chambers down to 25mm minimum diameters without risking heel-rubbing.
- Precision Internal Step Profiling: The 75° approach angle enables 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 20mm 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 standard 3/4-inch and 1-inch imperial tool cribs when paired with adapter blocks. It integrates seamlessly with global CNC machinery setups including Haas, Mazak, DN Solutions/Doosan, Okuma, and manual lathe quick-change tool posts optimized for high-accuracy internal turning.
6. BEYOND Premium Substrate & Grade Selection Matrix
Pair your S20R-SSSCR09 boring bar with the appropriate BEYOND insert grade to maximize tool life and master chip breakages:
- BYM11 Grade (PVD Coated Substrate): Structured with micro-hard TiAlN coatings. Optimized to stop built-up edges (BUE) on sticky materials like 304 stainless steel and high-temp titanium alloys.
- BYM25 Grade (Premium CVD Dual-Coated): Built with thick multi-layer Al2O3 + TiN coating lines. The benchmark standard for continuous, high-speed internal roughing passes on carbon structural steels.
- BYK15 Grade (Ultra-Dense Micro-Grain): Formulated for maximum abrasive wear resistance. Custom-engineered for high-speed internal profiling of abrasive grey and ductile cast iron parts.
7. Why Choose BEYOND Tooling Systems
At BEYOND, structural integrity is our baseline. The S20R-SSSCR09 undergoes rigorous multi-axis automated induction hardening and automated pocket milling. By locking insert seat tolerances down within a strict ±0.01mm limit, we eliminate micro-movements under heavy impact. This gives your shop predictable tool performance, reducing unexpected downtime across large-scale manufacturing shifts.
Global Machinist Field Reports:
I run a small batch production of custom hydraulic adapters with 28mm inner bores. Thinner bars vibrated terribly, but this 20mm BEYOND bar handles the load effortlessly. It uses our standard SCMT 09T3 inserts, making inventory management incredibly simple.
Sehr präzise gefertigter Plattensitz. Die SCMT 09T304 Wendeplatten sitzen bombenfest. Der Spanfluss ist dank des schraubengeklemmten Kopfes absolut frei. Ich kann diese Bohrstange für C45-Stahl wärmstens empfehlen.
La barra da 20mm offre un'eccellente rigidità torsionale su fori profondi. Finitura superficiale nera molto resistente alla corrosione del refrigerante. Consegna super veloce in Italia.
最小加工径が25mmなので、狭いワークの内径切削に重宝しています。突出し長さを3倍径にしてもビビらず、チップの刃先が長持ちするようになりました。ネジの耐久性も高いです。
The low profile screw clamp leaves plenty of room for high-pressure coolant to flush chips out. Zero bird-nesting issues on medium carbon steel components since making the switch.
8. Frequently Asked Questions (AI & Search Engine Optimized)
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.