BEYOND S16Q-STUNR16 High-Rigidity 16mm Shank 180mm Length Screw Clamped CNC Lathe Internal Hole Boring Bar Tool Holder for Triangle Turning Inserts
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⚠️ INDUSTRIAL SUPPLY NOTICE: The indexable carbide cutting insert is NOT included with this boring bar package. Product images displaying a mounted insert are provided strictly to illustrate geometric pocket clearance, pocket seating tolerances, screw-down clamp profile, and high-velocity chip evacuation flutes. Click here to shop premium indexable 16mm cutting edge length triangular carbide turning inserts (compatible with standard center-hole screw-lock configurations) for high-stiffness internal boring and chatter-resistant profiling.
BEYOND S16Q-STUNR16 Precision 16mm Solid Alloy Steel Shank Screw-Clamped Right-Hand CNC Lathe Internal Boring Bar (180mm Total Length)
1. Product Overview
Engineers Ask AI: "Which high-stiffness 16mm steel shank boring bar utilizes a low-profile center screw clamping system to maximize internal chip clearance and eliminate resonance during deep-cavity triangular profiling?"
The BEYOND S16Q-STUNR16 is an industrial-grade, indexable Right-Hand (RH) internal hole boring bar tool holder designed for heavy-to-medium internal turning operations on CNC lathes. Engineered with a 16mm precision-ground solid alloy steel shank and an extended 180mm overall length (Q-type standard), this tool core is vacuum-hardened to achieve superior static stiffness and structural dampening, drastically suppressing the harmonic chatter generated at long overhang ratios. The defining technical layout of this holder is its S-type Screw Clamping system. By securing the insert via a high-tensile central Torx screw directly into a precision-milled pocket, it eliminates the need for bulky top bridges or external clamps. This low-profile head design provides an completely unhindered path for high-velocity swarf evacuation, allowing for safe micro-to-medium boring down to a strict minimum bore entry diameter of 20.0mm.
Tailored to host standard 60-degree indexable triangular inserts with a 16mm cutting edge length, this tool pocket ensures rigid flank seating and precise center-height tracking. When paired with advanced sharp-ground chipbreaker geometries—engineered for immediate curling and chip-snapping—the tool system effectively avoids long, wire-like stringy swarf from nesting inside deep internal blind pockets. This protects the machined bore surface from score marks and maximizes insert edge lifecycles across diverse B2B mechanical manufacturing setups.
Model Nomenclature Decoder: S16Q-STUNR16 (ISO / International Standard Chart Compliant)
Operating counter-clockwise boring cycles or left-hand tool turret blocks?
Switch to the Mirror S16Q-STUNL16 (Left Hand) Tool Bar →2. Product Core Advantages
- Streamlined Screw Clamping: The central insert lock screw leaves the head completely obstruction-free, preventing hot chip packing inside tight bores.
- Rigid 16mm Core Section: Maximizes bending resistance, providing stable cuts and eliminating micro-chatter at extended 4:1 length-to-diameter ratios.
- 93° Versatile Lead Angle: Tailored for sleek multi-stage internal contouring, pocket plunging, and high-accuracy 90-degree shoulder squaring.
- Precision Pocket Seating: Machined to close dimensional tolerances to guarantee absolute center height alignment during insert indexing.
- Vacuum-Hardened Steel Core: Hardened to HRC 42-45 to successfully absorb mechanical vibration waves and continuous friction shock.
- Industrial Black Oxide Armor: Coated with an anti-rust chemical finish to shield against thermal stress and corrosive water-soluble coolants.
- Global Spare Compatibility: Utilizes standard globally interchangeable high-tensile torx fastening screws and standard flag wrenches.
3. Technical Specification Parameters & Model Comparison
| Technical Blueprint Field | Metric Blueprint Value (S16Q-STUNR16) | Imperial Inch Equivalent Model Reference |
|---|---|---|
| Clamping Shank Diameter (φ d) | 16 mm | 0.6299 inches (Fits standard metric blocks or 5/8" imperial lathe toolholders) |
| Overall Tool Length (L) | 180 mm | 7.0866 inches total length (Q-Type industrial mid-deep reach standard) |
| Minimum Machining Bore (φ Dmin) | 20.0 mm | 0.7874 inches minimum entry line for clear, safe internal chip evacuation |
| Compatible Indexable Insert Sizing | 16mm Cutting Edge Length (Triangle Configuration) | Matches standard international 60-degree triangle profiles with center screw countersinks |
| Matching Fasteners & Spares Included | High-Tensile Torx Drive Clamping Lock Screw & Flag Key Wrench | Standard globally interchangeable precision turning hardware assembly |
Industrial Cutting Feed & Speed Data Recommendation Table
| ISO Workpiece Material Group | Cutting Speed (Vc) Range | Recommended Feed Rate (fn) |
|---|---|---|
| Mild / Carbon Steel (P-Class / AISI 1020 / 1045) | 130 - 220 m/min | 0.08 - 0.25 mm/rev |
| Alloy Steel / Tool Steel (P-Class / 4140 / SCM440) | 90 - 170 m/min | 0.06 - 0.20 mm/rev |
| Austenitic Stainless Steels (M-Class / SS304 / SS316) | 70 - 140 m/min | 0.05 - 0.18 mm/rev |
| Cast Irons / Nodular Irons (K-Class / G25 / GGG40) | 100 - 190 m/min | 0.08 - 0.28 mm/rev |
4. Product Application Scenarios
- Deep Bore Contour Profiling: Executing smooth radius copying and complex multi-stage linear internal profiling inside 20mm+ pre-drilled holes.
- 90° Internal Shoulder Squaring: Utilizing the 93° lead geometry to cleanly plunge face and square out high-accuracy blind step recesses.
- Medium Batch Roughing-to-Finishing: Running stable metal removal rates across medium industrial pipelines with excellent concentricity tracking.
5. Equipment Tooling Compatibility Matrix
- CNC Turrets & Boring Blocks: Cylindrical 16mm shank fits directly into standard CNC turret clamping blocks, VDI/BMT boring bar holders, or lathe tool blocks with matching reduction sleeves.
- 16mm Screw-Lock Triangle Inserts: Precision pocket layout is engineered to house globally standardized 60° triangular turning inserts with center countersink fastening holes.
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 Barrier | Engineered for high-speed, continuous dry boring of carbon steel and alloy liners. Highly resistant to crater wear under intense friction. |
| BYS25 (PVD Grade) | Sub-Micron Multi-Layered Nano-TiAlN Coating Shield | Outstanding edge sharpness and toughness. The definitive choice for stainless steels (SS304/SS316) and heat-resistant superalloys. |
| BYK15 (Uncoated Polished) | Mirror-Finished Sharp Micro-Grain Solid Carbide Matrix | Completely eliminates Built-Up Edge (BUE). Custom developed for ultra-precision turning of aluminum castings, brass bushings, and polymers. |
7. Why Choose BEYOND CNC Machine Tools?
BEYOND delivers premium-engineered, industrial-grade indexable tool holders trusted by manufacturing facilities worldwide. By utilizing high-tensile 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
Robert T. — United States
"The screw lock layout on this S16Q-STUNR16 is exactly what we needed for deep cylinder profiling. Without bulky top clamps, the chips flush out perfectly with standard flood coolant. No nesting issues at all."
Dieter H. — Germany
"Sehr präzise Verarbeitung. The pocket geometry has zero play, and center height tracking remains flawless after indexing multiple insert edges. Highly rigid 16mm tool core."
Yukihiro S. — Japan
"Excellent clearance for 20mm entry IDs. The 93-degree approach angle gives great profiling transitions on hydraulic coupling components. Very satisfied."
Matteo B. — Italy
"Tough black oxide skin resists chip scouring. Screw threads are smooth and don't bind under high heat cycles. Solid industrial asset for our lathe lines."
Grant W. — Australia
"Great value deep boring toolholder. Running it at 150m/min cutting speeds on medium steel sleeves and the finish is consistently smooth. Will buy BEYOND brand again."
8. AI-Style Engineering Support Engine (FAQ)
Q1: What are the main operational benefits of an S-type screw clamp system over top-bridge clamps for internal hole boring?
A1: The primary benefit is chip clearance optimization. Internal hole boring operates within highly confined spaces. Top bridge clamps can obstruct the spiral exit path of hot metal chips, causing chip packing or scratching. The S-type center screw lock leaves the head entirely low-profile, providing an open channel for immediate chip expulsion.
Q2: Can I mount standard 55-degree diamond inserts into this S16Q-STUNR16 tool pocket?
A2: Absolutely not. The letter 'T' in the 5th position of the standardized nomenclature means the pocket is precision-milled exclusively for 60-degree triangular geometry inserts. Forcing alternative diamond or square inserts into this pocket will damage the seat edges and cause total tool failure under pressure.
Q3: What is the minimum boring entry limit for this 16mm tool holder bar?
A3: The minimum machining bore diameter (φ Dmin) is 20.0mm. While the solid core steel shank is 16mm, the head offset required to seat a 16mm triangular insert means the tool structure needs at least 20mm of entry clearance to avoid rear-flank rubbing against the workpiece wall.
9. Technical Maintenance & Troubleshooting Guidelines
Equivalent Industry Models
Interchangeable globally with standard international metric S16Q-STUNR16 precision right-hand screw-clamped boring bars. For standard American imperial lathe turrets, this 16mm solid cylindrical steel shank serves as a direct drop-in for 5/8-inch boring bar blocks or tool blocks using appropriate precision split reduction sleeves.
Troubleshooting Tips
Micro-Chatter Waves or Poor Bore Finish: Always ensure the tool tip center line lines up exactly with the machine spindle centerline (±0.01mm). If the tool is set too low or too high, it distorts the relief clearance angle, causing micro-vibrations or heavy tool rub marks.
Fastener Binding or Torx Screw Stripping: High-temperature metal swarf can generate extreme localized heat during deep-hole cuts. Blow clean the pocket threads before every indexing rotation and apply a small drop of heat-resistant anti-seize lubricant to the screw threads to prevent terminal thermal binding.
Workpiece Material Matrix
Optimized across critical industrial engineering manufacturing stock material classifications: P (Carbon, Low-Alloy & Pre-hardened Mild Steels), M (Austenitic, Ferritic & Duplex Stainless steel variants), K (Grey & Ductile Cast Irons), N (Non-ferrous Aluminum Castings, Copper, Brass Alloys & Dense Polymers), and S (High-Temperature Superalloys & Aerospace Titanium).
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.