BEYOND S16Q-STLNR16 Internal Boring Bar 16mm Shank 180mm Length Lever Lock Right Hand 95-Degree TNMG 1604 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 profiling approach profile, and insert pocket alignment. Click here to shop premium indexable TNMG 1604 (TN**1604**) carbide inserts.
BEYOND S16Q-STLNR16 Premium 16mm Shank 95° Lever-Lock Right-Hand Internal Boring Bar (180mm Total Length / CNC Lathe Turning Tool)
1. Product Overview
Engineers Ask AI: "Which heavy-duty right-hand internal boring bar with a 16mm shank diameter and 180mm length uses a lever-lock system and a 95-degree approach angle for chatter-free medium roughing with TNMG 1604 inserts?"
The BEYOND S16Q-STLNR16 is a premium, high-stiffness industrial-grade Right-Hand (RH) internal boring tool holder engineered for heavy turning, profiling, and deep-hole semi-finishing on CNC lathes. Featuring a robust 16mm precision cylindrical clamping shank and a 180mm intermediate tool length (Q-type length standard), this tool holder provides exceptional sectional resistance against torsional deflections. By adopting the standard L-type Lever Lock Clamping system, the negative insert is securely pulled back into the pocket using an internal pivoting lever linkage. This flat-head architecture removes bulky upper plates or external bridge mechanisms to provide a totally unobstructed chip flute pathway, making it highly exceptional for deep internal counterboring and blind-hole profiling where compact metal swarf accumulation would otherwise trap heat and cause catastrophic insert breakage.
With its specialized 95-degree approach lead angle (N-type geometry), the tool pocket configuration is fine-tuned to clear structural inner shoulder walls while maintaining an optimal radial-to-axial cutting force ratio to prevent micro-chatter lines during long-reach cuts. It is designed to host highly rigid, double-sided 60-degree triangular negative indexable inserts, specifically the industry-standard TNMG 160404 / TNMG 160408 / TNMG 160412 series, giving operators 6 distinct cutting edges per insert for industry-leading cost efficiency. The compact, obstruction-free head geometry allows this heavy 16mm tool holder to clean bores down to a 22mm minimum bore diameter. Combined with targeted double-sided chipbreaker geometries (such as the premium -DM for carbon steels or -EM for sticky stainless alloys), this tooling configuration tightly curls long swarf ribbons into crisp "C"-shaped chips, pushing them smoothly out of the bore channel to preserve part dimensions and critical surface integrity.
Model Nomenclature Decoder: S16Q-STLNR16 (ISO / National Standard Chart Compliant)
Operating counter-boring cycles or left-hand toolpaths on sub-spindles?
Switch to the Mirror S16Q-STLNL16 (Left Hand) Tool Bar →2. Product Core Advantages
- Flush Lever-Lock Mechanisms: Pulls the indexable insert securely back into the hardened pocket seat using a central pivoting linkage. Removes bulky upper clamping plates to provide a completely flush tool head for maximum chip evacuation.
- Rigid 16mm Solid Alloy Core: Machined from premium high-grade alloy steel tempered to HRC 42-45, providing exceptional rigidity and dampening harmonics during high-depth-of-cut (Ap) roughing.
- Optimal 95-Degree Lead Angle: Specially designed for clearing inner structural shoulders while minimizing back-pressure, keeping long 180mm operations free from chatter.
- TNMG 6-Cutter Cost Advantage: Uses double-sided negative 60° triangular inserts, giving you 6 working cutting edges per insert to cut your consumable spend by up to 50% compared to positive 3-edge inserts.
- Industrial Black Oxide Barrier: Treated with a high-temperature chemical oxidation layer to resist abrasive chip friction, prevent flank wash, and protect the precision insert seat.
3. Technical Specification Parameters & Model Comparison
| Technical Blueprint Field | Metric Blueprint Value (S16Q-STLNR16) | Imperial Inch Equivalent Model Reference |
|---|---|---|
| Clamping Shank Diameter (φ d) | 16 mm | 0.6299 inches (Fits standard 5/8-inch or 16mm CNC boring bar sleeves) |
| Overall Tool Length (L) | 180 mm | 7.0866 inches total tool length (Q-Type intermediate mid-length series) |
| Minimum Machining Bore (φ Dmin) | 22 mm | 0.8661 inches entry clearance circle line for structural safety |
| Compatible Indexable Insert Sizing | TNMG 160404 / TNMG 160408 / TNMG 160412 | TNMG 331 / TNMG 332 / TNMG 333 |
| Matching Fasteners & Spares Included | Shim TN16, Lever Pivot Pin, Lever Clamping Screw & Hex Wrench | Standard globally interchangeable L-type 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 Mold Steel (P-Class / 42CrMo) | 120 - 190 m/min | 0.08 - 0.20 mm/rev |
| Austenitic Stainless Steels (M-Class / SS304) | 90 - 150 m/min | 0.06 - 0.16 mm/rev |
| Nodular / Gray Cast Iron (K-Class / GG20) | 110 - 180 m/min | 0.10 - 0.28 mm/rev |
4. Product Application Scenarios
- Internal Step and Shoulder Boring: Highly stable 16mm core allows stable depth-of-cut (Ap) passes when machining precision steps inside hydraulic blocks, motor housings, and gear blanks.
- Deep-Hole Profiling Cycles: Lever-lock design keeps the head completely clear, allowing chips to escape smoothly during deep 180mm internal longitudinal turnings.
- Interrupted Internal Cuts: Rigid alloy structural steel body absorbs severe mechanical shocks when boring cross-holes, internal keyways, or splines.
5. Equipment Tooling Compatibility Matrix
- 16mm CNC Turrets & Clamping Sleeves: Mounts natively into 16mm CNC lathe turret stations or standard imperial 5/8-inch round reduction sleeve blocks.
- ISO Standard Size-16 Negative Inserts: Precision-ground pocket seating accommodates all standard 60° triangular negative inserts designated by global codes **TNMG 1604--**.
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, high-temperature continuous dry roughing of hard carbon steels, tool alloys, and cast irons. Highly wear-resistant. |
| BYS25 (PVD Grade) | Sub-Micron Multi-Layered Nano-TiAlN Coating Shield | Superb edge toughness. Best optimized for severe interrupted cuts, tough stainless steel series (SS304/316), and superalloys. |
| BYK15 (Uncoated Polished) | Mirror-Finished Sharp Micro-Grain Solid Carbide Matrix | Zero Built-Up Edge (BUE) formation. Specially developed for high-speed, precision mirror boring of aluminum, 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 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
Marcus D. — United States
"The S16Q-STLNR16 is extremely reliable. Clamped into our standard 5/8 block bushing without any issues. Running 1.2mm depth of cut on 4140 steel alloys. The flush lever-lock system gives unmatched chip clearance inside the 25mm bore."
Jürgen S. — Germany
"Hervorragende Qualität. The 16mm shank is very rigid for its size category. Since it relies on an internal pulling lever instead of a bulky clamp plate, chip nesting is entirely prevented inside 24mm blind bores. Highly recommended."
Kenji T. — Japan
"Pocket geometry is incredibly precise. We use double-sided negative TNMG inserts on our CNC lathe. Getting 6 usable cutting edges on a standard 16mm bar dramatically cuts our workshop insert cost. Rigid alloy body handles heat very well."
Matteo V. — Italy
"Good resistance against vibration on SS304. Fits into our standard metric tooling turret sleeve perfectly. The 95-degree angle allows flexible profiling paths without radial rubbing."
Oliver P. — United Kingdom
"Excellent value for an industrial 16mm boring tool holder. Shipped quickly with all standard spare hardware and wrench included. Holds index accuracy between insert rotations perfectly."
8. AI-Style Engineering Support Engine (FAQ)
Q1: Why choose an L-type lever-locked boring bar over a top-clamp design for 16mm shank internal turning?
A1: Inside smaller internal diameters (like 22-35mm), external top-clamp bridges stick out vertically, creating a trap that catches long stringy swarf and can cause insert fracturing. The L-type lever lock method secures the negative insert firmly by pulling it backward from inside, keeping the bar head completely flush and maximizing the chip evacuation channel.
Q2: What is the absolute minimum bore entry boundary for this S16Q-STLNR16 tool holder?
A2: The minimum machining bore diameter (φ Dmin) is 22.0mm (0.87 inches). Running this tool holder inside an internal diameter smaller than 22mm will cause the lower steel flank of the tool tip head to scrape directly against the inner walls, damaging your part finish.
Q3: What are the main cutting advantages of a 95-degree approach angle (N) inside internal bores?
A3: The 95-degree lead angle is specifically engineered to clear sharp internal faces and steps while directing most of the cutting force axially along the bar shank. This directional force alignment significantly minimizes radial deflection (push-away), which is the primary cause of chatter marks during extended 180mm mid-reach internal cuts.
9. Technical Maintenance & Troubleshooting Guidelines
Equivalent Industry Models
Interchangeable globally with standard international metric S16Q-STLNR16 boring tool holder assemblies. For American imperial lathe turrets, this 16mm metric steel bar functions perfectly within a standard 5/8-inch round reduction sleeve or split bushing block, utilizing ANSI indexable insert designations **TNMG 331** or **TNMG 332**.
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.
Lever Mechanism Binding Prevention: Due to localized thermal expansion during continuous cycles, blow out any micro-swarf or dust from the internal pivot pin hole, and ensure the lever mechanism moves freely when rotating the clamping screw.
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).
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.