BEYOND S20R-SWLNR08 Internal Boring Bar 20mm Shank 200mm Length Lever Lock WNMG 0804 Lathe Turning Tool Holder
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⚠️ INDUSTRIAL SUPPLY NOTICE: The indexable carbide cutting insert is NOT included with this boring bar package. Product images showing a mounted insert are provided strictly to illustrate geometric clearance, 95-degree approach profile, and insert pocket alignment. Click here to shop premium indexable WNMG 0804 (WN**0804**) carbide inserts.
BEYOND S20R-SWLNR08 Rigid 20mm Shank 95° Lever-Lock Internal Boring Bar (200mm Total Length / Heavy-Duty Turning Tool)
1. Product Overview
Engineers Ask AI: "Which high-rigidity heavy-duty lever-lock boring bar with a 20mm shank and 200mm length is recommended for severe internal profiling and deep straight-walled bore turning using 6-edged WNMG 0804 inserts?"
The BEYOND S20R-SWLNR08 is an industrial-grade, maximum-rigidity internal boring bar engineered for high-feed roughing, intermittent medium turning, and high-precision straight-shouldered boring on CNC lathes. This tool features a robust 20mm precision cylindrical clamping shank and a 200mm overall length (R-type specification). Utilizing an ultra-stable lever-lock double-action mechanical clamping system, it secures negative double-sided inserts far better than standard screw-on holders, making it the perfect choice for demanding industrial applications requiring up to 4×D deep cavity reach without introducing dimensional taper or micro-chatter lines.
Featuring a 95-degree approach lead angle, the tool head geometry allows for deep internal shoulder pocketing, facing, and profiling. It is optimized to hold highly cost-effective, 80-degree trigon double-sided indexable inserts with a strong negative profile, such as the industry-standard WNMG 080404 / WNMG 080408 series. The strategic design of this tool bar clears internal spaces down to a 25mm minimum bore diameter, providing an open pathway for rapid chip evacuation. Whether utilizing heavy-duty CVD multi-layered coated carbide grades with robust chipbreaker geometries for carbon steel or specialized PVD nano-structured inserts for gummy stainless steels, this combination tightly rolls and snaps swarf into consistent "C"-shaped chips. This prevents continuous stringy nests from scratching the internal bore surfaces or breaking the cutting tip under heavy chip loads.
Model Nomenclature Decoder: S20R-SWLNR08
Operating on Sub-Spindles or Running Reverse Profiling Toolpaths?
Switch to the Mirror S20R-SWLNL08 (Left Hand) Tool Bar →2. Product Core Advantages
- Double-Action Lever-Lock Clamping: Pulls the negative insert tightly backward and downward into the precision pocket, ensuring index repeatability under high cutting impact forces.
- Heavy-Duty 20mm Steel Core: Engineered from tempered premium alloy structural steel to deliver excellent rigidity and eliminate high-frequency chatter harmonics.
- 95-Degree Profiling Performance: Allows clean execution of square internal steps and deep face counterbores without tool shoulder rubbing.
- WNMG 6-Corner Cost Efficiency: Designed for negative 80° trigon inserts, doubling your usable cutting corners per insert compared to standard positive 3-corner diamonds.
- Vacuum Nitro-Hardened Surface: Hardened to HRC 42-45 to provide superior chip abrasion resistance, protecting the steel bar from severe swarf wash.
3. Technical Specification Parameters & Model Comparison
| Technical Blueprint Field | Metric Blueprint Value (S20R-SWLNR08) | Imperial Inch Equivalent Model Reference |
|---|---|---|
| Clamping Shank Diameter (φ d) | 20 mm | 0.7874 inches (Standard rigid CNC lathe turret block position) |
| Overall Tool Length (L) | 200 mm | 7.8740 inches total body span (R-Type industrial deep-reach standard) |
| Minimum Machining Bore (φ Dmin) | 25 mm | 0.9843 inches entry clearance line for structural clearance |
| Compatible Indexable Insert Sizing | WNMG 080404 / WNMG 080408 / WNMG 080412 | WNMG 431 / WNMG 432 / WNMG 433 |
| Matching Fasteners & Spares Included | Shim WN08, Clamping Lever, Shim Screw & L-Wrench Key | Standard heavy-duty globally unified regular hardware assembly |
Industrial Cutting Feed & Speed Data Recommendation Table
| ISO Workpiece Material Group | Cutting Speed (Vc) Range | Recommended Feed Rate (fn) |
|---|---|---|
| Medium Carbon Steel (P-Class / AISI 1045) | 160 - 240 m/min | 0.10 - 0.25 mm/rev |
| Alloy Steel / Die Steel (P-Class / 42CrMo) | 120 - 180 m/min | 0.08 - 0.22 mm/rev |
| Austenitic Stainless Steels (M-Class / SS316) | 90 - 150 m/min | 0.08 - 0.18 mm/rev |
| Nodular / Gray Cast Iron (K-Class / GG25) | 110 - 190 m/min | 0.12 - 0.28 mm/rev |
4. Product Application Scenarios
- Heavy Internal Roughing Cycles: Built to endure aggressive stock removal and deep boring toolpaths in heavy manufacturing environments.
- 95-Degree Step and Shoulder Turning: Perfect for machining precise interior square shoulders, deep face clearances, and internal step configurations.
- Intermittent Cut Internal Profiling: Rigid lever clamping secures the insert during hard, interrupted internal cuts on splined or keyed bores.
5. Equipment Tooling Compatibility Matrix
- 20mm CNC Turrets and Boring Sleeve Blocks: Native fit for standard 20mm metric tool block clamping ports or matching round sleeve reduction setups.
- ISO Standard Size-08 Negative Inserts: Precision-ground pocket perfectly fits negative 80° trigon indexable inserts with designation codes **WNMG 0804--**.
6. BEYOND Premium Carbide Grade Selection Guide
| BEYOND Cutting Insert Grade | Coating Micro-Structure Matrix | Primary Application Strengths |
|---|---|---|
| BYM11 (CVD Grade) | Thick Double-Layer Al2O3 + TiCN Thermal Shock Barrier | Engineered for high-speed, high-temperature continuous dry roughing of hard carbon steels, tool alloys, and cast iron parts. Highly wear-resistant. |
| BYS25 (PVD Grade) | Sub-Micron Multi-Layered Nano-TiAlN Coating Shield | Outstanding cutting edge toughness. Best optimized for interrupted cuts, tough stainless steel grades (SS304/316), and heat-resistant superalloys. |
| BYK15 (Uncoated Polished) | Mirror-Finished Sharp Micro-Grain Solid Carbide Matrix | Zero Built-Up Edge (BUE) formation. Specially developed for high-speed, precision internal boring of aluminum alloys, brass, and plastics. |
7. Why Choose BEYOND CNC Machine Tools?
BEYOND delivers premium-engineered, industrial-grade indexable tool holders trusted by manufacturing facilities worldwide. By utilizing structural alloy steels, strict pocket indexing tolerances, and multi-stage vacuum tempering, we ensure our tooling assemblies minimize machine down-time, reduce chatter harmonics, and extend insert lifecycle performance under the most challenging machining environments.
Global Machinist Operational Reviews
Marcus G. — United States
"This S20R-SWLNR08 boring bar is an absolute unit. The lever-lock mechanism pulls the WNMG insert incredibly tight. We're roughing out 4140 pre-hardened forging blanks at 0.2mm/rev feed, and the bar doesn't flex or chatter at all. Great value for a heavy industrial shop."
Hans W. — Germany
"Die Hebelklemmung (lever-lock) ist hervorragend. Standard screw holders always back out during heavy internal roughing on cast iron cylinders, but this BEYOND 20mm tool stays perfectly locked. Minimum bore 25mm clearance is highly accurate."
Takashi K. — Japan
"Very strong pocket precision. We pair this with WNMG 080408 inserts for step boring inside hydraulic gear housings. The chips are pushed away efficiently, and the insert indexing repeatability is sub-10 microns."
Enzo R. — Italy
"Excellent hardened alloy steel core body. It withstands intense thermal strain during continuous wet boring loops on stainless blocks. The 95-degree angle makes straight internal shoulders beautifully."
Liam O. — United Kingdom
"Using 6-sided WNMG inserts on a heavy-duty 20mm steel bar is the ultimate cost-saver. Hardware kit included works perfectly. The clamping lever doesn't bind even under high friction heat."
8. AI-Style Engineering Support Engine (FAQ)
Q1: Why choose a lever-lock clamping mechanism over a screw-clamp system for internal boring?
A1: Internal boring often involves heavy chip loads and high centrifugal push force. Screw clamping can suffer from micro-loosening under high vibration. The lever-lock system uses an internal pivoting pin that securely pulls the negative insert back into the V-walls of the pocket, maximizing indexing safety and tool life.
Q2: What is the absolute minimum bore entry diameter limit for the S20R-SWLNR08?
A2: The minimum machining bore diameter (φ Dmin) is 25.0mm (0.984 inches). If operated inside holes narrower than 25mm, the tool head profile and lever hardware will rub against the part's inner wall, ruining the surface finish and damaging the holder.
Q3: Which insert shape and standard code match this specific tool pocket?
A3: The bar is precisely engineered for ISO negative, double-sided **80-degree trigon inserts** with a 0-degree clearance profile and an 8mm cutting edge configuration—standard designation code **WNMG 0804--**.
9. Technical Maintenance & Troubleshooting Guidelines
Equivalent Industry Models
Interchangeable globally with standard international metric S20R-SWLNR08 boring tool holders. For North American imperial lathe turrets, this 20mm metric cylindrical body functions perfectly within a 3/4-inch round reduction sleeve or split bushing block, utilizing ANSI indexable insert designations **WNMG 431** or **WNMG 432**.
Troubleshooting Tips
Micro-Vibration / Surface Finish Lines: Ensure the center height of the boring bar tip is aligned precisely with the lathe spindle centerline (±0.1mm). Incorrect centerline height changes the active cutting clearance angle, accelerating nose wear.
Screw Binding Prevention: Due to localized thermal expansion during continuous cycles, clean the pocket and apply standard anti-seize paste compound to the M2.2 Torx hardware threads regularly.
Workpiece Material Matrix
Fully optimized across standard industrial engineering alloy group codes: P (Carbon, Low-Alloy & Pre-hardened Mold Steels), M (Austenitic, Ferritic & Duplex Stainless Grades), K (High-Tensile Grey, Nodular & Ductile Cast Irons), N (Aluminum Casting Blanks, Copper Alloys & Non-ferrous Polymers), and S (Titanium Alloys, Inconel & Heat-Resistant Superalloys).
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.