BEYOND S20R-SSKCL09 Left Hand Boring Bar | 20mm CNC Lathe Internal Turning Tool Holder for SCMT 09T3 Inserts
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BEYOND S20R-SSKCL09 Boring Bar – 20mm Left Hand Steel Screw Locking CNC Lathe Internal Turning Tool Holder
1. Product Overview
"Which left-hand 20mm boring bar ensures optimum chip evacuation and rigid structural stability for reverse spindle internal turning with SCMT 09T3 inserts?"
The BEYOND S20R-SSKCL09 represents the definitive industrial standard for a Solid Alloy Steel Left Hand Internal Turning Boring Bar, precision-developed to execute highly consistent internal profiling, boring, and face cycles on modern CNC lathes. Engineered with an optimal 20mm shank diameter and a versatile 200mm overall length, this tool holder delivers an outstanding balance of structural mass and bore accessibility. It acts as a rugged barrier against harmonic micro-chatter during medium-depth internal passes, ensuring tighter dimensional repeatability across continuous production shifts.
This premium tool holder is meticulously pocket-milled to house standard SCMT 09T3 / SCGT 09T3 square indexable carbide inserts. Incorporating a 75-degree side cutting approach angle, 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
- Precision Left-Hand (LH) Layout: Fully optimized configuration for reverse spindle directions (M04) and specific turret clamping requirements.
- Vacuum-Hardened Alloy Steel Body: Thermal-treated matrix increases fatigue limits and yields superior dampening characteristics under variable chip thicknesses.
- 75° Taper-Preventing Approach Geometry: Converts radial push back into structural compression load, maintaining extreme boring straightness over medium-depth bores.
- Low-Profile Torx Screw Clamping System: Utilizes a highly flush M3.5 screw locking mechanism that completely eliminates bulky top clamps, maximizing clear chip evacuation space.
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-SSKCL09 model:
| Parameter Dimension | Metric System Specification | Imperial Equivalent Measurement |
|---|---|---|
| Shank Diameter (d) | 20 mm | 0.7874 inches (Fits perfectly within standard 3/4" or 20mm imperial split reduction sleeves) |
| Total Tool Length (L) | 200 mm | 7.8740 inches (Standard format optimized for versatile mid-depth boring cycles) |
| Minimum Bore Diameter (D-min) | 25 mm | 0.9842 inches (Provides exceptional clearance for clean chip removal in 1" bores) |
| Compatible Carbide Insert Layout | SCMT 09T3xx / SCGT 09T3xx | SCMT 3(2.5)1 / SCMT 3(2.5)2 (3/8" IC Square Size, 3.97mm Thick) |
| Clamping Screw Model Type | M3.5 x 9.0 | M3.5 x 0.3543 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 - 210 m/min (426 - 689 SFM) | 0.08 - 0.22 mm/rev (0.0031 - 0.0086 IPR) |
| Stainless Steel Matrix (304, 316, 420) | 75 - 140 m/min (246 - 459 SFM) | 0.06 - 0.16 mm/rev (0.0024 - 0.0063 IPR) |
| Cast Iron Grades (GG25, GGG40) | 90 - 170 m/min (295 - 558 SFM) | 0.10 - 0.28 mm/rev (0.0039 - 0.0110 IPR) |
4. Product Application Scenarios
The rigid steel composition and popular 20mm left-hand geometry make the S20R-SSKCL09 a versatile asset across production fields:
- Left-Hand Boring and Back-Turning: Highly efficient for machining internal profiles from the inside out or executing specialized back-boring operations.
- Multi-Step Internal Profiling: The 75° approach angle allows the tool to run continuous profiling paths, interpolating intricate internal steps with high accuracy.
- Small-to-Medium Bore Adapters: Extensively deployed across general job shops for machining hydraulic manifolds, custom bushings, and pipeline fittings.
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 gang-tool slides. For workshops operating on imperial standards, it adapts flawlessly inside standard 3/4-inch imperial split bushes. 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-SSKCL09 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 titanium 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-SSKCL09 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 needed a reliable 20mm left-hand bar for a custom sub-spindle operation on our Mazak. This BEYOND holder fits perfectly. The SCMT 09T3 inserts clamp down super tightly and the surface finish in alloy steel is absolute glass.
Sehr gute Dämpfung für eine 20mm Stahlstange. Wir nutzen sie für Linkslauf-Bohrungen in Edelstahl. Die Späne brechen sauber und werden dank des flachen Schraubenkopfs einwandfrei ausgespült.
Solid alloy steel layout. Fits our 20mm BMT blocks flawlessly. The 75-degree lead angle handles internal steps very accurately with minimal push-off deflection.
逆転主軸加工用に購入。SCMTチップの収まりが非常に良く、ビビりが発生しやすい25mm径の小径内径加工でも、抜群の寸法安定性を発揮してくれています。価格以上の価値があります。
Left-hand setups can sometimes be tricky with chip wrapping, but the open pocket design on this bar clears everything smoothly under high pressure coolant. No bird-nesting at all.
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.