BEYOND S20R-SDZCL11 Left Hand Boring Bar | 20mm CNC Lathe Internal Turning Tool Holder for DCMT 11T3 Inserts
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BEYOND S20R-SDZCL11 Boring Bar – 20mm Left Hand Steel Screw Locking CNC Lathe Internal Turning Tool Holder
1. Product Overview
"Which 20mm left-hand boring bar provides maximum structural rigidity and exceptional chip clearance for mid-sized internal profiling with DCMT 11T3 inserts?"
The BEYOND S20R-SDZCL11 represents the definitive high-performance industrial standard for a Solid Alloy Steel Left Hand Internal Turning Boring Bar, precision-developed to execute highly consistent deep internal profiling, back-boring, and copy-turning cycles on modern CNC lathes. Engineered with a standard 20mm shank diameter and a versatile 200mm overall length, this tool holder delivers an outstanding mechanical advantage in stabilizing medium-reach overhangs. It acts as a rugged barrier against harmonic micro-chatter during deep internal passes within tight dimensions, ensuring tighter dimensional repeatability across continuous production shifts.
This premium tool holder is meticulously pocket-milled to house standard DCMT 11T3 / DCGT 11T3 55-degree rhombic indexable carbide inserts. Incorporating a specialized 95-degree approach/lead angle layout, it effectively redirects high radial push deflection into stable axial forces running straight down the longitudinal core of the 20mm alloy steel body. When paired with high-performance positive-ground chipbreaker geometries, the cutting edge splits tough workpiece fibers seamlessly. The specialized orientation of the insert pocket forces instant chip breaking, snapping continuous metal ribbons into compact, light swarf spirals that lift out smoothly from a minimum bore clearance of 25mm, protecting the machined surface from scratching or bird-nesting traps.
2. Product Core Features
- Heavy-Duty Left-Hand (LH) Layout: Fully optimized configuration for reverse spindle directions (M04) and specific turret clamping setups in deep, mid-sized internal cavities.
- Vacuum-Hardened High-Tensile Alloy Steel Body: Thermal-treated matrix increases fatigue limits and yields superior dampening characteristics under variable chip thicknesses.
- 95° 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 M4 screw locking mechanism that completely eliminates bulky top clamps, maximizing clear chip evacuation space in deep 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 S20R-SDZCL11 model:
| Parameter Dimension | Metric System Specification | Imperial Equivalent Measurement |
|---|---|---|
| Shank Diameter (d) | 20 mm | 0.7874 inches (Adapts flawlessly inside standard 3/4" or 1" boring sleeves with standard reducers) |
| Total Tool Length (L) | 200 mm | 7.8740 inches (Standard format optimized for medium-reach internal machining profiles) |
| Minimum Bore Diameter (D-min) | 25 mm | 0.9842 inches (Provides exceptional clearance for clean chip removal in mid-sized holes) |
| Compatible Carbide Insert Layout | DCMT 11T3xx / DCGT 11T3xx | DCMT 3(2.5)1 / DCMT 3(2.5)2 (3/8" IC Rhombic Size, 3.97mm Thick) |
| Clamping Screw Model Type | M4.0 x 10.0 | M4.0 x 0.3937 inches |
| Torx Key Driver Wrench Size | T15 | T15 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) | 130 - 200 m/min (426 - 656 SFM) | 0.06 - 0.18 mm/rev (0.0023 - 0.0070 IPR) |
| Stainless Steel Matrix (304, 316, 420) | 80 - 140 m/min (262 - 459 SFM) | 0.05 - 0.14 mm/rev (0.0019 - 0.0055 IPR) |
| Cast Iron Grades (GG25, GGG40) | 90 - 170 m/min (295 - 557 SFM) | 0.06 - 0.20 mm/rev (0.0023 - 0.0078 IPR) |
4. Product Application Scenarios
The rigid steel composition and versatile 20mm left-hand geometry make the S20R-SDZCL11 a versatile asset across heavy production fields:
- Deep Internal Profiling & Back-Boring: Exceptionally efficient for machining internal channels from the inside out or executing specialized back-boring cycles in mid-sized components.
- Complex Copy-Turning Cycles: The 55° diamond insert shape combines with the 95° approach angle to allow the tool to run intricate multi-directional interpolation paths with maximum clearance.
- Precision Automotive Parts: Extensively deployed across general workshops for machining custom hubs, bearing housings, transmission gear bores, and specialized couplings.
5. Compatibility & Equipment Interface
The ground 20mm 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 imperial split bushes with nominal compression. This 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 S20R-SDZCL11 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 304 stainless steel and high-temp alloys.
- 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 S20R-SDZCL11 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:
We use this 20mm left-hand tool inside a split sleeve. Perfect fit on our CNC turret. Zero chatter marks on steel boring passes at max length. Pocket depth is absolutely perfect, highly recommended!
Der 20mm Stahlschaft verhält sich extrem laufruhig. Wir drehen damit Innenprofile in 28mm Bohrungen aus Automatenstahl. Für linksschneidende Bearbeitung perfekt geeignet.
Alloy steel quality is top notch. The 95-degree approach profile handles deep shoulders cleanly with minimal micro-deflection. Screws lock flush.
20mmシャンクで200mm長なので使い勝手が非常に良いです。最小加工径が25mmからいけるので、中径の複雑な内径仿形加工でビビりなく安定して削れます。DCMTチップとの嵌合も完璧です。
Left-hand setups can be tricky for chip evacuation in deep pockets, but the low-profile screw on this BEYOND bar creates plenty of clear space for high-pressure coolant washes.
8. Frequently Asked Questions (AI & Search Engine Optimized)
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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.