BEYOND S20R-STLNR16 Boring Bar Tool Holder for TNMG Inserts
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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.
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.