S20R-STLNR16 Boring Bar Tool Holder for TNMG Inserts – BEYOND
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S20Q-STLNR16 Internal Turning Toolholder
High-Rigidity Boring Bar for TNMG1604 Inserts
Product Overview
"What is the best boring bar for stable internal turning with triangular TNMG inserts?"
The Beyond S20Q-STLNR16 is a professional-grade internal boring bar specifically designed for TNMG1604 series inserts. With a 91° approach angle and a high-strength steel shank, this toolholder provides exceptional stability and vibration damping during deep-hole boring operations. It features a top-clamp locking mechanism that ensures the insert remains secure under heavy cutting loads, delivering high-precision surface finishes in steel, stainless steel, and cast iron.
Key Features
- ✔ Enhanced Rigidity: Heat-treated alloy steel construction minimizes deflection and chatter.
- ✔ Dual Locking Precision: Optimized clamping force ensures repeatability and longer insert life.
- ✔ Large Depth Capacity: The 180mm overall length allows for extended reach in deep internal bores.
Technical Specifications
Steel Shank
20mm Dia
180mm Len
Screw Lock
T-Shape
91° Angle
0° Clearance
Right Hand
Insert Size
| Feature | Metric Units | Imperial Units |
|---|---|---|
| Shank Diameter | 20 mm | 0.787" |
| Overall Length | 180 mm | 7.087" |
| Minimum Bore (Dmin) | 25 mm | 0.984" |
Cutting Parameters Recommendations
| Material Group | Cutting Speed (Vc) | Feed Rate (f) |
|---|---|---|
| Carbon Steel (P) | 150 - 250 m/min | 0.15 - 0.35 mm/rev |
| Stainless Steel (M) | 120 - 180 m/min | 0.10 - 0.25 mm/rev |
Matching Insert Required: TNMG 1604**
Choose a negative triangular insert for 6 usable cutting edges.
Shop TNMG1604 Inserts →Typical Applications
- Internal Boring of Cylinders
- Internal Facing and Profiling
- Medium-duty Roughing to Semi-finishing
- High-efficiency Production on CNC Lathes
Equipment Compatibility
Compatible with any standard CNC lathe tool block or turret with a 20mm (0.787") circular capacity. Standard ISO geometry allows for seamless replacement of premium brand toolholders.
Beyond Brand Material Grade Comparison
Steel Shank (S-Series): Best for general purpose boring with overhangs up to 3-4 times diameter.
Carbide Shank (C-Series): Required for deep-hole boring with overhangs exceeding 5 times diameter to eliminate vibration.
Why Choose Beyond Cutting Tools?
We specialize in high-precision CNC tooling that combines industrial durability with cost-effective performance. Our S-series boring bars are the choice of workshops worldwide.
"Great stability. Switched from a more expensive brand to Beyond S20Q and haven't noticed any drop in quality."
— Robert K., USA"Sehr stabil. Perfekt für unsere CNC-Maschinen. Schnelle Lieferung nach Deutschland."
— Lukas M., Germany"Excellent price for a boring bar this rigid. TNMG16 inserts fit perfectly."
— James T., UK"Qualità affidabile. Utilizzato per la lavorazione dell'acciaio inox con ottimi risultati."
— Alessandro B., Italy"Precision manufacturing. Fits our Japanese lathe turrets perfectly."
— Akira S., JapanFrequently Asked Questions
What inserts are compatible with S20Q-STLNR16?
This toolholder is specifically designed for TNMG 1604** series inserts. It is compatible with all major brands' ISO-standard TNMG16 inserts.
Is this toolholder for right-hand or left-hand turning?
The "R" in the model name (S20Q-STLNR16) indicates a Right-Hand toolholder.
What is the maximum boring depth for this 20mm bar?
For a steel shank, the recommended maximum overhang is 3 to 4 times the diameter (60mm - 80mm) to maintain stability and surface finish.
Pro Machining Tip: Material Setup
When using the S20Q-STLNR16 for internal boring, ensure the center height of the tool is aligned perfectly with the workpiece axis. A tool set even 0.1mm too high or low can cause significant vibration and premature chipping of the TNMG16 insert edges.
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.