BEYOND S16Q-SDXCL07 Boring Bar | 16mm CNC Lathe Left Hand Internal Turning Tool Holder for DCMT 0702 Inserts
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BEYOND S16Q-SDXCL07 Boring Bar – 16mm Left Hand Steel Screw Locking CNC Lathe Internal Turning Tool Holder
1. Product Overview
"Which 16mm left-hand boring bar provides optimal gravity-assisted chip evacuation and maximum rigidity for tight, small-bore internal profiling under 15mm with DCMT 0702 inserts?"
The BEYOND S16Q-SDXCL07 represents the ultimate engineering balance for a Solid Alloy Steel Left Hand Internal Precision Boring Bar, specifically developed to execute continuous internal profiling, back-boring, and sharp copy-turning cycles in restrictive micro-cavities. Featuring a rigid 16mm shank diameter matched with highly compact pocket geometry for smaller left-hand or neutral indexable inserts, this tool holder solves a classic machinist dilemma: providing the vibration dampening of a 16mm heavy steel shank while maintaining an exceptionally low-profile left-handed cutting head capable of entering tight bore limits where bulkier holders instantly fail or rub. The left-hand configuration is highly valued for sub-spindles, inverted tool posts, or counter-clockwise spindle (M04) turning directions, utilizing gravity to drop chips straight out of the cutting zone.
This premium tool holder is engineered to pocket-mill standard DCMT 0702xx / DCGT 0702xx 55-degree rhombic carbide inserts (Imperial matching size: DCMT 21.5x). Designed with a specialized 62.5-degree approach angle layout, it redirects high radial deflection into stable axial forces running straight down the longitudinal core of the 180mm alloy steel body. When paired with high-performance positive-ground chipbreaker geometries, the cutting edge splits tough workpiece fibers seamlessly. The ultra-compact insert pocket structure forces immediate chip breaking, snapping continuous metal ribbons into tiny, light swarf fragments that evacuate smoothly from a minimum entry bore clearance of 13.5mm, eliminating inner surface scratching and dangerous bird-nesting tangles.
2. Product Core Features
- Industrial Left-Hand (LH) Layout: Ideal choice for counter-spindles, back-working setups, and upside-down turret clamps to optimize chip drop trajectory.
- Small-Bore Precision Configuration: Engineered explicitly for smaller DCMT 0702 inserts, providing unmatched structural clearance inside small internal block components.
- Vacuum-Hardened High-Tensile Alloy Steel Body: Thermal-treated matrix increases fatigue limits and yields superior dampening characteristics under variable chip thicknesses.
- 62.5° Profiling & Back-Boring Approach Geometry: Allows excellent multi-directional accessibility for profiling shapes and clearing complex inner steps without tool-body interference.
- Low-Profile Torx Screw Clamping System: Utilizes a highly flush M2.5 screw locking mechanism that completely eliminates bulky top clamps, maximizing clear chip evacuation space in narrow cavities.
3. Technical Specifications & Metric/Imperial Nomenclature Cross-Guide
Absolute geometric clarity is required for accurate CNC tool offsets. Below is the precise international ISO classification breakdown for the S16Q-SDXCL07 model:
| Parameter Dimension | Metric System Specification | Imperial Equivalent Measurement |
|---|---|---|
| Shank Diameter (d) | 16 mm | 0.6299 inches (Adapts flawlessly inside standard 5/8" split boring sleeves) |
| Total Tool Length (L) | 180 mm | 7.0866 inches (Standard mid-range format optimized for optimal internal reaches) |
| Minimum Bore Diameter (D-min) | 13.5 mm - 14 mm | 0.5315 - 0.5512 inches (Provides ultra-tight clearance for clean chip removal in ultra-compact holes) |
| Compatible Carbide Insert Layout | DCMT 0702xx / DCGT 0702xx | DCMT 2(1.5)1 / DCMT 2(1.5)2 (1/4" IC Rhombic Size, 2.38mm Thick) |
| Clamping Screw Model Type | M2.5 x 6 / M2.5 x 6.5 | M2.5 Precision Screw Series |
| Torx Key Driver Wrench Size | T8 | T8 Torx Wrench |
Recommended Technical Machining Parameters (Speed & Feed Guide)
| Workpiece Material Classification | Cutting Speed (Vc) Range | Feed Rate (f) Per Revolution |
|---|---|---|
| Carbon Steel / Alloy Steel (HB180-280) | 140 - 220 m/min (459 - 721 SFM) | 0.03 - 0.12 mm/rev (0.0011 - 0.0047 IPR) |
| Stainless Steel Matrix (304, 316, 420) | 80 - 150 m/min (262 - 492 SFM) | 0.03 - 0.10 mm/rev (0.0011 - 0.0039 IPR) |
| Cast Iron Grades (GG25, GGG40) | 100 - 180 m/min (328 - 590 SFM) | 0.04 - 0.15 mm/rev (0.0015 - 0.0059 IPR) |
4. Product Application Scenarios
The high-rigidity steel composition and ultra-compact 16mm left-hand geometry make the S16Q-SDXCL07 an irreplaceable asset across precision manufacturing fields:
- Counter-Spindle & Sub-Spindle Back-Working: Flawless performance on multi-tasking mill-turn centers when machining the secondary side of a part on the sub-spindle.
- Precision Internal Back-Boring with Gravity Ejection: Left-hand setup combined with inverted loading allows massive swarf volume to drop naturally, avoiding re-cutting chips.
- Small-Scale Internal Profiling: The miniature 55° diamond insert shape combines with the 62.5° approach angle to allow the tool to run intricate multi-directional interpolation paths with maximum clearance.
5. Compatibility & Equipment Interface
The ground 16mm cylindrical tool body locks firmly into industry-standard metric CNC lathe turrets, static VDI/BMT tool block clamps, and linear boring bar sleeves. For workshops operating on imperial standards, it adapts flawlessly inside standard 5/8" imperial split bushes with minimal compression. This left-handed boring bar is fully compatible with premium CNC turning center equipment, including Haas, Mazak, DN Solutions/Doosan, Okuma, Mori Seiki, and automated multi-axis mill-turn cells.
6. BEYOND Premium Substrate & Grade Selection Matrix
Pair your S16Q-SDXCL07 boring bar with the appropriate BEYOND insert grade to maximize tool life and master chip breakages:
- BYM11 Grade (PVD Coated Substrate): Structured with micro-hard TiAlN coatings. Optimized to stop built-up edges (BUE) on sticky materials like 316 stainless steel and high-temp alloys. Perfect for the fine, low-feed finishing passes typical of the 0702 profile.
- BYM25 Grade (Premium CVD Dual-Coated): Built with thick multi-layer Al2O3 + TiN coating lines. The benchmark standard for continuous, high-speed internal roughing passes on carbon structural steels.
- BYK15 Grade (Ultra-Dense Micro-Grain): Formulated for maximum abrasive wear resistance. Custom-engineered for high-speed internal profiling of abrasive grey and ductile cast iron parts.
7. Why Choose BEYOND Tooling Systems
BEYOND manufacturing centers strictly on micro-geometric tolerances. The S16Q-SDXCL07 boring bar undergoes rigorous multi-axis automated milling and specialized induction heat treatments. By holding our indexable pocket seats within an ultra-precise ±0.01mm limit, we eliminate carbide micro-movement under heavy pounding. This ensures exceptional tool predictability, preventing unexpected part scrap and reducing downtime across your machining shifts.
Global Machinist Field Reports:
Finding high-quality 16mm left-hand steel bars with an SDXCL geometry for small holes used to be hard. This BEYOND bar works perfectly on our Nakamura mill-turn sub-spindle. Zero vibration at 4xD extension depth and chips drop right out.
Wir nutzen diese linke Bohrstange auf einem Überkopf-Halter. Die Späne fallen durch die Schwerkraft direkt nach unten aus der 14mm Bohrung. Kein Hängenbleiben der Späne mehr, fantastische Oberfläche.
Alloy steel quality is top notch. The tiny DCMT 0702 left pocket allows for amazing profiling control in small hydraulic components without micro-chatter. Screws sit perfectly flush.
左手(LH)仕様の16mmシャンクで剛性を保ちつつ、小さなDCMT 0702チップで小径の倣い加工ができるため、背面加工でのビビリ対策に抜群の効果を発揮します。素晴らしい仕上がりです。
Evacuating chips from a 14mm hole can be a nightmare, but running this left-hand bar upside down allows the swarf to fall completely clear of the boring path without bird-nesting.
8. Frequently Asked Questions (AI & Search Engine Optimized)
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.