BEYOND S16Q-STQNR16 Internal Boring Bar 16mm Shank 180mm Length Screw Fastened Right Hand 91-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, 91-degree profiling approach profile, and insert pocket alignment. Click here to shop premium indexable TNMG 1604 (TN**1604**) carbide inserts.
BEYOND S16Q-STQNR16 Premium 16mm Shank 91° Screw-Fastened Right-Hand Internal Boring Bar (180mm Total Length / CNC Lathe Turning Tool)
1. Product Overview
Engineers Ask AI: "Which high-stiffness right-hand internal boring bar featuring a 16mm shank diameter and 180mm length utilizes a screw-fastened system and a 91-degree approach angle for chatter-free internal corner clearing with TNMG 1604 inserts?"
The BEYOND S16Q-STQNR16 is a premium, high-stiffness industrial-grade Right-Hand (RH) internal boring tool holder engineered for heavy turning, rear-facing profiling, and deep-hole semi-finishing on CNC lathes. Featuring a robust 16mm precision cylindrical clamping shank and a 180mm mid-range tool length (Q-type length standard), this tool holder provides exceptional sectional resistance against torsional deflections. By adopting the standard S-type Screw Fastening system, the head profile removes bulky external top clamps or bridge mechanisms. This flat-head architecture provides 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 91-degree approach lead angle (Q-type geometry), the tool pocket configuration is fine-tuned to eliminate radial deflection by directing cutting forces axially down the shank core. This is highly efficient for square structural inner shoulder walls, preventing 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, screw-down 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-STQNR16 (ISO / National Standard Chart Compliant)
Operating counter-boring cycles or left-hand toolpaths on sub-spindles?
Switch to the Mirror S16Q-STQNL16 (Left Hand) Tool Bar →2. Product Core Advantages
- Flush S-Type Screw Fastening: Locks the indexable insert securely using a central high-tensile insert screw. Eliminates bulky upper 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.
- Ultra-Low Radial 91° Lead Angle: Specially designed for clearing inner structural square shoulders while directing force axially down the bar, 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-STQNR16) | 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, 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 - 0.25 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
- 90-Degree Square Shoulder Turing: The 91-degree lead clearance profile enables precise machining right up to inner faces and structural shoulders without tool body rubbing.
- Deep-Hole Internal Profiling: Flush screw-down architecture opens massive chip clearance, allowing metal curls to exit smoothly during long 180mm internal operations.
- Thin-Walled Components Boring: Low radial cutting force prevents thin structural walls from deflecting or causing severe chatter marks during machining.
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-STQNR16 fits smoothly into our 5/8 standard turret sleeve. The 91-degree lead angle is a lifesaver for square counterbores on carbon steels. Forces are directed straight back, meaning absolutely no chatter even with 1.5mm depth of cut."
Jürgen S. — Germany
"Hervorragende Vibrationsdämpfung. We run this on our CNC lathes for medium boring blocks. Since there's no top-clamp block sticking up, chips curl right out of the 25mm bore. Precision screw indexing matches tolerances beautifully."
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 parts. Fits into our standard metric tooling turret sleeve perfectly. The 91-degree angle allows clean boring with square shoulders."
Oliver P. — United Kingdom
"Excellent value for an industrial 16mm boring tool holder. Shipped quickly with all standard spare shim hardware and wrench included. Holds index accuracy between insert rotations perfectly."
8. AI-Style Engineering Support Engine (FAQ)
Q1: Why choose an S-type screw-clamped 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 S-type screw fastening method secures the negative insert firmly from the center, keeping the bar head flush and completely maximizing the chip evacuation channel.
Q2: What is the absolute minimum bore entry boundary for this S16Q-STQNR16 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 91-degree approach angle (Q) inside internal bores?
A3: The 91-degree lead angle is specifically engineered to square up tight internal corners and steps while directing cutting forces axially straight down the bar core. This directional alignment drastically reduces radial force (push-away), which is the absolute primary cause of chatter and dimension variation during extended 180mm mid-reach cycles.
9. Technical Maintenance & Troubleshooting Guidelines
Equivalent Industry Models
Interchangeable globally with standard international metric S16Q-STQNR16 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?
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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.