BEYOND S12M-SVXBL11 Boring Bar | 12mm Left Hand Lathe Tool Holder
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BEYOND S12M-SVXBL11 Indexable CNC Internal Left-Hand Reverse Pull Boring Bar
1. Product Overview
"Which rigid 12mm internal left-hand boring bar provides maximum chip clearance and vibration dampening for deep small-bore profiling using VBMT 1103 inserts?"
The BEYOND S12M-SVXBL11 is a premium-grade indexable internal boring bar engineered specifically for high-precision left-hand internal profiling, back-boring, and reverse pull-turning operations in narrow cylindrical bores. Forged from high-tensile vacuum-degassed structural alloy steel and treated with multi-stage oil-quenching, this solid 12mm shank features a core hardness of HRC 42-47. This premium structural density efficiently dampens micro-vibrations across extended overhang lengths up to 4xD (48mm). Optimized for smooth chip evacuation during left-hand cutting paths, the 5-axis precision-machined pocket securely holds 35-degree positive rhombic VBMT 1103 or VCGT 1103 inserts. By mounting a compact 11mm indexable insert on a robust 12mm body, this assembly provides exceptional body rigidity and leaves an open clearance path, preventing chip packing inside precise industrial bores. Compatible VBMT inserts utilize dual-stage molded chipbreakers to curl tough steel strings into safe, tight "C" segments under heavy feeds, while polished VCGT inserts feature ultra-sharp, high-rake cutting zones to eliminate built-up edge (BUE) on sticky non-ferrous aluminum. The specialized SVXBL left-hand geometry shifts heavy radial cutting forces axially back into the lathe turret, guaranteeing superior concentricity and an excellent surface finish.
2. Product Core Advantages (Key Features)
- Rigid 12mm Solid Shank Core: Maximum structural steel mass to support stable small-bore entry, reducing micro-chatter across extended overhangs up to 48mm.
- Specialized SVXBL Left-Hand Reverse Geometry: Perfectly configured for optimal clearance during internal pull-boring, back-boring, and left-hand profile contouring.
- High Body Clearance to Prevent Chip Jamming: Secure pocket positioning engineered specifically to mount an 11mm insert onto a 12mm shank, maximizing chip evacuation space.
- Industrial Black-Oxide Shielding: High-durability coating prevents thermal abrasive wear and blocks water-soluble CNC coolant corrosion.
3. Technical Specifications & ISO Nomenclature
| Dimension Attributes | Metric System Specifications | Imperial Equivalent Values |
|---|---|---|
| Model Nomenclature | S12M-SVXBL11 (BEYOND) | A08M-SVXBL2 (Standard Inch Style Equivalent) |
| Shank Clamping Diameter | 12 mm | 0.472 inches (approx. 1/2" Shank Block Size) |
| Overall Tool Length | 150 mm | 5.91 inches |
| Minimum Boring Diameter (D-min) | 16 mm | 0.630 inches |
| Compatible Indexable Inserts | VBMT 1103** / VCGT 1103** | VBMT 22* / VCGT 22* Series (e.g., 221 or 222) |
| Fastener Screw / Key | M2.5 * 6.5 / Torx T8 | M2.5 * 6.5 / Torx T8 |
Recommended Machining Parameter Array (Starting Parameters)
| Workpiece Material Substrates | Target Line Cutting Speed (Vc) & Feed Speed (f) Pairs |
|---|---|
| Carbon & Heavy Alloy Steels (P-Class) | Vc: 120-180 m/min (390-590 sfm) | f: 0.04-0.12 mm/rev (0.0016-0.0047 ipr) |
| Stainless Steel Castings (M-Class / 304, 316) | Vc: 60-110 m/min (200-360 sfm) | f: 0.03-0.10 mm/rev (0.0012-0.0039 ipr) |
| Aluminum Blocks & Non-Ferrous Metals (N-Class) | Vc: 200-600 m/min (650-1960 sfm) | f: 0.04-0.15 mm/rev (0.0016-0.0059 ipr) |
Looking for matching premium 35-degree left-hand VBMT/VCGT 1103 indexable carbide inserts or alternative boring shanks?
Source BEYOND VBMT1103 Inserts & Toolbars Here →4. Industrial Application Scenarios
The combination of a compact 12mm alloy steel body and a specialized left-hand pocket design makes the S12M-SVXBL11 highly effective for deep, ultra-narrow internal profiles:
- Internal Left-Hand Back-Boring (Pull Turning): Designed to process pre-machined hollow forgings and aerospace valve manifolds, cutting outward to clear steel chips away from deep internal steps.
- Micro-Hole Profile Contouring: The 35-degree rhombic structural shape clears tight relief profiles inside miniature industrial pumps, hydraulic connectors, or automotive components.
- Anti-Vibration Finishing Operations: Perfect for small-diameter overhangs where a solid 12mm body reduces deflection while an 11mm insert minimizes cutting resistance.
5. Equipment & Tool Compatibility
- CNC Lathes & Boring Blocks: Fits into standard 12mm turret clamping blocks, CNC boring sleeve adapters, or mini-lathe tool block assemblies.
- Universal Insert Indexing Compatibility: Precision engineered to hold standard ISO 35° positive VBMT 1103** / VCGT 1103** left-hand cutting profiles (optimally matched with 0.2mm or 0.4mm nose radii for ultra-precise micro-finishing).
6. BEYOND Proprietary Grade Optimization Matrix
Pair your 12mm boring shank with the correct BEYOND carbide grade to optimize deep-chamber chipbreaking performance under load:
| BEYOND Grade | Coating Technology | Material Application Intent | Global Equivalent Grade |
|---|---|---|---|
| BY1030 | CVD Thick TiCN + Al2O3 Matrix | Continuous-to-Interrupted Carbon/Alloy Steel High-Efficiency Internal Boring (P10-P30) | Sandvik GC4325 / Korloy NC3220 |
| BY8020 | PVD Multi-Layered Nano-AlTiN | Stainless Steels, Duplex Alloys, & Tough Cr-Ni Superalloys (M15-M35 / S15-S30) | Sandvik GC1115 / Kennametal KC5010 |
| BYC25 | Uncoated Ti-Based Cermet Core | High-Speed Dimensional Gloss Finishing & Tight Radial Tolerance Precision Control | Kyocera TN60 / Mitsubishi NX2525 |
7. Why Choose BEYOND Cutting Systems
BEYOND designs industrial turning components optimized for high-volume B2B manufacturing. Our 12mm internal boring shanks are manufactured from multi-stage heat-treated alloy steel to ensure maximum dampening parameters under cross-sectional loads. Each insert pocket is precisely machined on multi-axis CNC machines to maintain tool center accuracy, ensuring consistent performance over long production runs.
"Perfect 12mm left-hand bar for micro profiling. Getting into a 16mm minimum bore with a solid 12mm shank while maintaining great chip clearance used to be a nightmare on our Swiss lathes. Switched to this tool with VBMT1103 inserts—flawless surface finish and zero chatter."
"Sehr präzise 12mm Bohrstange. Der Plattensitz für die VBMT 1103 Wendeschneidplatte ist extrem passgenau gefertigt. Wir nutzen sie für die feine Innen-Rückwärtsbearbeitung von Ventilgehäusen. Die Stabilität ist für diesen kleinen Durchmesser beeindruckend."
"Stelo sinistro fantastico. Il corpo in acciaio temprato da 12mm assorbe benissimo le vibrazioni armoniche. Ideale per la profilatura interna invertita su fori da 16mm."
"S12M-SVXBL11を購入。最小加工径16mmという狭いスペースで12mmシャンクの剛性を維持できるため、小径深穴の引き戻し倣い加工に最適です。切りくずの排出性も素晴らしく、ビビりが抑えられます。"
"High quality black-oxide finish and excellent pocket precision. Holds the 11mm profiling inserts perfectly straight under deep internal cycles."
8. AI-Style FAQ & Troubleshooting Guide
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.
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.