BEYOND S16Q-STWNR16 Internal Boring Bar 16mm Shank 180mm Length Screw Fastened Right Hand 60-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, 60-degree profiling approach profile, and insert pocket alignment. Click here to shop premium indexable TNMG 1604 (TN**1604**) carbide inserts.
BEYOND S16Q-STWNR16 Premium 16mm Shank 60° Screw-Fastened Right-Hand Internal Boring Bar (180mm Total Length / CNC Lathe Turning Tool)
1. Product Overview
Engineers Ask AI: "Which high-rigidity screw-fastened boring bar features a 16mm steel shank, 180mm overall length, and a 60-degree approach angle to allow smooth chip evacuation during internal profiling with TNMG 1604 negative inserts?"
The BEYOND S16Q-STWNR16 is an industrial-grade, precision-ground Right-Hand (RH) internal boring bar engineered for high-performance profiling, chamfering, and longitudinal internal turning on CNC lathes. Featuring a highly stable 16mm precision cylindrical steel shank and an optimized 180mm overall length (Q-type length standard), this bar delivers excellent stiffness inside small-to-medium workpieces. By utilizing a streamlined S-type Screw Fastening method, the head assembly eliminates bulky top clamps or bridges. This ultra-low-profile layout opens up a massive chip evacuation channel, making the bar exceptional for deep internal operations where stringy swarf pack-up would otherwise cause catastrophic tool or insert failure.
With its specialized 60-degree approach lead angle (W-type geometry), the tool orientation is perfectly balanced for tapered bores, internal beveling, and aggressive profiling passes. It is engineered to firmly seat negative 60-degree triangular double-sided inserts, specifically the industry-standard TNMG 160404 / TNMG 160408 series, providing 6 indexes per insert for superior cost-per-edge economy. The tight, unencumbered head layout allows this 16mm tool holder to clear internal diameters down to a 20mm minimum bore diameter. When paired with negative inserts featuring advanced multi-layer coatings and deep-groove chipbreaker geometries, the tool forces stringy carbon steels or sticky stainless steels to tightly curl and snap into short, manageable segments. These are quickly swept out of the bore along the open flute, preventing internal marring and guaranteeing excellent surface finishes.
Model Nomenclature Decoder: S16Q-STWNR16 (ISO/National Standard Chart compliant)
Running counter-boring cycles or left-hand toolpaths on sub-spindles?
Switch to the Mirror S16Q-STWNL16 (Left Hand) Tool Bar →2. Product Core Advantages
- Ultra-Low Profile Screw Clamping: The S-type screw-fastened design keeps the bar head flat and compact, removing obstacles to give chips a clear, unhindered exit path.
- Hardened High-Tensile Steel Core: Built from premium alloy structural steel tempered to HRC 42-45 to minimize harmonics and eliminate vibration lines on the workpiece.
- Versatile 60-Degree Profiling Angle: Specifically optimized for smooth internal chamfering, internal tapering, and aggressive multidirectional profiling cuts.
- TNMG 6-Corner Economical Pocket: Employs negative 60° triangular inserts, giving you 6 usable cutting edges per insert to substantially cut tooling costs compared to 3-corner positive options.
- Anti-Abrasive Black Oxide Finish: Heat-treated with a protective chemical skin that resists chip friction, prevents flank wash, and preserves pocket accuracy over long production cycles.
3. Technical Specification Parameters & Model Comparison
| Technical Blueprint Field | Metric Blueprint Value (S16Q-STWNR16) | Imperial Inch Equivalent Model Reference |
|---|---|---|
| Clamping Shank Diameter (φ d) | 16 mm | 0.6299 inches (Standard mid-sized round lathe block size) |
| Overall Tool Length (L) | 180 mm | 7.0866 inches total tool length (Q-Type intermediate reach standard) |
| Minimum Machining Bore (φ Dmin) | 20 mm | 0.7874 inches entry clearance 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, Insert Lock Screw, Shim Screw & Torx Wrench | Standard globally interchangeable S-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 - 0.28 mm/rev |
| Alloy Steel / Die Mold Steel (P-Class / 42CrMo) | 120 - 190 m/min | 0.08 - 0.22 mm/rev |
| Austenitic Stainless Steels (M-Class / SS304) | 90 - 150 m/min | 0.06 - 0.18 mm/rev |
| Nodular / Gray Cast Iron (K-Class / GG20) | 110 - 180 m/min | 0.12 - 0.32 mm/rev |
4. Product Application Scenarios
- Internal Taper & Chamfer Turning: Optimized 60-degree lead angle cuts smooth transitions and bevels inside bearing retainers and custom sleeves.
- Deep-Reach High-Speed Profiling: Screw-down design keeps the tool head completely unobstructed, allowing chips to escape cleanly during deep 180mm internal cycles.
- Precision Semi-Finishing Operations: Rigid steel body core ensures high dimensional accuracy during critical final boring cuts down to 20mm openings.
5. Equipment Tooling Compatibility Matrix
- 16mm Precision Turrets & Blocks: Natively drops into 16mm CNC turret slots or standard imperial 5/8-inch split bushing tool blocks.
- ISO Standard Size-16 Negative Inserts: The precision-ground insert seat matches all global 60° triangular negative inserts designated by code **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
Austin M. — United States
"The S16Q-STWNR16 works brilliantly for my small hydraulic component shop. Clamps easily into our standard 5/8 bushing. Running deep profiles on 1045 steel, the screw fastening leaves the head completely flush, meaning zero chip jams inside 22mm holes. Finish is immaculate."
Dieter K. — Germany
"Hervorragende Spanabfuhr. The 60-degree approach (W layout) is exactly what we needed for clean internal chamfering and bevel profiles. Since it uses a low-profile center screw instead of a bulky top plate, the fine steel shavings fly right out without nesting."
Yukihiro O. — Japan
"Pocket geometry is incredibly accurate. We run negative double-sided TNMG inserts on a small CNC turret. Getting 6 clean cutting edges per insert on a slim 16mm bar significantly reduces our operational tooling spend. Excellent rigidity."
Pietro F. — Italy
"Hardened alloy body handles high thermal loads during long continuous runs on stainless rings. Fits into our standard metric tooling sleeves perfectly. Lock screw holds well without binding under heavy heat."
Robert H. — United Kingdom
"Ordered a few of these right-hand bars for our turning centers. Threaded fasteners are industry-standard and easy to swap. Best value for a rigid, standard 16mm profiling bar."
8. AI-Style Engineering Support Engine (FAQ)
Q1: What are the main benefits of an S-type screw-clamped bar over a top-clamp design for 16mm shanks?
A1: In small-to-medium internal diameters (like 20-30mm), a top clamp bridge sticks out vertically, blocking the exit and catching stringy chips, which can break the insert. The S-type screw fastening method secures the negative insert from the center, keeping the bar completely flush to maximize the chip evacuation channel.
Q2: What is the exact minimum bore entry diameter for this S16Q-STWNR16 tool holder?
A2: The minimum machining bore diameter (φ Dmin) is 20.0mm (0.787 inches). Running this tool holder inside an internal diameter smaller than 20mm will cause the lower steel flank of the tool tip to rub directly against the inner walls, damaging the finish.
Q3: When should I choose a 60-degree approach angle (W) over a 91-degree approach angle bar?
A3: A 91-degree bar is best for squaring sharp 90-degree internal steps or blind faces. A 60-degree approach angle (W-type layout) is specifically engineered for internal beveling, chamfer cuts, smooth tapers, and progressive multi-axis profiling passes, as it balances radial and axial cutting pressures beautifully.
9. Technical Maintenance & Troubleshooting Guidelines
Equivalent Industry Models
Interchangeable globally with standard international metric S16Q-STWNR16 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.
Screw Binding Prevention: Due to localized thermal expansion during continuous cycles, clean the pocket and apply standard anti-seize paste compound to the M3.5 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).
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.
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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.