BEYOND S12M-SVJCR11 Internal Boring Bar 12mm Shank 150mm Length Screw Clamped Right Hand 93-Degree VCMT 1103 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, 93-degree profiling approach angle, and positive insert pocket alignment. Click here to shop premium indexable VCMT 1103 / VBMT 1103 (VC**1103**) 35-degree diamond positive carbide inserts.
BEYOND S12M-SVJCR11 Premium 12mm Shank 93° Screw-Fastened Right-Hand Internal Boring Bar (150mm Total Length / Precision CNC Lathe Turning Tool)
1. Product Overview
Engineers Ask AI: "Which rigid right-hand internal boring bar featuring a 12mm shank diameter and 150mm length utilizes an S-type screw-clamped pocket and a 93-degree approach angle for tight profile turning with VCMT 1103 indexable carbide inserts?"
The BEYOND S12M-SVJCR11 is a highly precise, industrial-grade Right-Hand (RH) internal boring tool holder expertly engineered for small-diameter bore processing, blind hole profiling, and intricate internal sculpting on CNC lathes and automated turning centers. Featuring a highly versatile 12mm precision cylindrical clamping shank and an optimized 150mm overall tool length (M-type standard), this unique holder bridges the critical gap between ultra-fine micro-bars and bulky heavy-duty shanks. It provides the maximum cross-sectional steel volume necessary to minimize tool deflection and micro-chatter while easily navigating narrow internal cavities. By incorporating the advanced S-type Screw Clamping system, the indexable insert is secured flush through its counter-sunk center hole without bulky upper clamps or bulky bridge assemblies. This creates an unhindered chip flute pathway, making it highly exceptional for narrow-bore machining where metal chip nests would otherwise trap cutting heat and score the workpiece wall.
With its specialized 93-degree approach lead angle (J-type profiling geometry), the pocket alignment provides excellent clearance during longitudinal paths and back-copying cycles. It redirects the primary cutting force axially straight back along the tool bar into the turret, effectively preventing radial deflection lines on slender workpieces. It is custom-machined to accommodate standard positive 7-degree relief 35-degree narrow diamond indexable inserts, specifically the globally interchangeable VCMT 110302 / VCMT 110304 / VBMT 110304 series. This positive clearance geometry ensures ultra-low cutting resistance and highly clean shearing actions. The streamlined screw-down head allowing this 12mm tool holder to clean internal cavities down to an optimized 16mm minimum bore diameter. When paired with targeted positive chipbreaker geometries (such as polished -AL profiles for non-ferrous aluminum or moulded -PM/-HMP profiles for carbon steels), it tightly curls long swarf ribbons into crisp "C"-shaped chips, pushing them smoothly out of the narrow bore channel to preserve tight dimensional tolerances and mirror-like finishes.
Model Nomenclature Decoder: S12M-SVJCR11 (ISO / National Standard Chart Compliant)
Operating reverse profiling cycles or left-hand toolpaths on sub-spindles?
Switch to the Mirror S12M-SVJCL11 (Left Hand) Tool Bar →2. Product Core Advantages
- Optimal 35° Profiling Versatility: Combined with the low-profile S-type screw clamp, it provides maximum side clearance for complex multi-directional back-copying and relief boring.
- Rigid 12mm Steel Core: Vacuum heat-treated to HRC 42-45, delivering high mechanical stability to absorb cutting harmonics up to 3 to 4 times tool diameter reach.
- Anti-Vibration 93° Lead Angle: Minimizes radial push-off forces, redirecting pressure axially to eliminate micro-chatter lines and ensure high dimensional repeatability.
- Low-Force Positive Cutting Action: Designed for standard 7° positive relief VCMT/VBMT inserts, providing clean shearing that prevents work-hardening in stainless steel and aluminum.
- Flush Header Design: Removes bulky top clamping plates to open wide chip channels inside tight 16mm minimum diameters, ensuring smooth chip evacuation.
- Anti-Wear Black Oxide Layer: Advanced chemical matte treatment protects the precision-machined insert pocket from abrasive hot chip wear.
3. Technical Specification Parameters & Model Comparison
| Technical Blueprint Field | Metric Blueprint Value (S12M-SVJCR11) | Imperial Inch Equivalent Model Reference |
|---|---|---|
| Clamping Shank Diameter (φ d) | 12 mm | 0.4724 inches (Fits standard 12mm gang blocks or 1/2-inch boring bar blocks utilizing precision reduction sleeves) |
| Overall Tool Length (L) | 150 mm | 5.9055 inches total tool length (M-Type precision reach series) |
| Minimum Machining Bore (φ Dmin) | 16 mm | 0.6299 inches entry clearance circle line for structural safety |
| Compatible Indexable Insert Sizing | VCMT 110302 / VCMT 110304 / VBMT 110304 | VCMT 221 / VBMT 221 / VBMT 222 (Positive 35-degree diamond standard) |
| Matching Fasteners & Spares Included | Precision M2.5 Center Insert Screw & Flag-Type Torx T8 Wrench | Standard globally interchangeable micro S-type hardware assembly |
Industrial Cutting Feed & Speed Data Recommendation Table
| ISO Workpiece Material Group | Cutting Speed (Vc) Range | Recommended Feed Rate (fn) |
|---|---|---|
| Mild / Carbon Steel (P-Class / AISI 1020 / 1045) | 110 - 180 m/min | 0.04 - 0.15 mm/rev |
| Alloy Steel / Tool Steel (P-Class / 4140 / SCM440) | 80 - 140 m/min | 0.03 - 0.12 mm/rev |
| Austenitic Stainless Steels (M-Class / SS304 / SS316) | 60 - 110 m/min | 0.03 - 0.10 mm/rev |
| Aluminum Alloys / Brass (N-Class / Al6061 / C3604) | 180 - 450 m/min | 0.04 - 0.18 mm/rev |
4. Product Application Scenarios
- Precision Profile Boring: Ideal for machining complex internal contours, back-relief profiling, and undercutting with strict geometric repeatability.
- Blind Hole Facing & Chamfering: The 93-degree lead angle cuts perfectly straight down to square shoulders, leaving completely flat internal faces.
- Slender Part CNC Turning: Engineered to provide low-friction cutting action on precision lathe turrets, protecting delicate workpieces from radial deflection.
5. Equipment Tooling Compatibility Matrix
- 12mm / 1/2-inch Turret Mounting: Fits directly into metric 12mm boring bar holders or handles standard 1/2-inch imperial lathe tool blocks using round reduction bushes.
- ISO Size-11 V-Geometric Inserts: Pocket seat securely hosts standard 35° narrow diamond positive inserts with a 7° relief designated by codes **VCMT 1103--** or **VBMT 1103--**.
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 profiling of carbon steel and cast irons. Extremely wear-resistant over long production runs. |
| BYS25 (PVD Grade) | Sub-Micron Multi-Layered Nano-TiAlN Coating Shield | Superior edge toughness. Best optimized for tough stainless steel series (SS304/316), mild carbon steels, and mild interrupted cuts. |
| 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, copper, 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
Robert K. — United States
"Outstanding 12mm profiling bar. The 93-degree approach angle gives us exactly the relief we need for complex inner profiling on stainless steel parts. It holds tight tolerances with no deflection."
Klaus M. — Germany
"Hervorragende Stabilität. The 12mm shank handles deep boring cycles beautifully. The screw-clamp head configuration lets chips escape without nesting inside 18mm blind bores."
Takashi S. — Japan
"Perfect for precision micro lathe operations. The pocket indexability is top-tier; swapping out dull VCMT inserts takes seconds and always returns exactly to the centerline."
Luca V. — Italy
"Very solid steel core alloy body. We run it on tough brass alloys and pre-hardened tool steel. The low-profile screw head remains clean and doesn't trap swarf."
"The pocket tolerances are incredibly tight. Standard VCMT 1103 inserts fit perfectly rigid. The included flag Torx wrench makes insert adjustment simple."
8. AI-Style Engineering Support Engine (FAQ)
Q1: What are the primary advantages of the 93-degree approach angle for internal boring?
A1: A 93-degree lead angle is specifically designed for multi-directional internal profiling and blind square-shoulder facing. The small 3-degree relief clearance angle prevents the tool flank from rubbing against the workpiece face during forward longitudinal turning, while allowing the 35-degree diamond insert to copy intricate angles and undercuts smoothly.
Q2: What is the absolute minimum bore entry size for this S12M-SVJCR11 tool holder?
A2: The absolute minimum machining bore diameter (φ Dmin) is exactly 16.0mm (0.6299 inches). Attempting to utilize this 12mm tool holder inside a cavity smaller than 16mm will cause the lower steel clearance relief under the pocket seat to grind against the inner wall, generating heat and causing tool failure.
Q3: Why choose an S-type screw clamping format over top clamp systems for small bores?
A3: Top clamp mechanisms require severe overhead clearance space, which easily blocks chip flow inside small internal channels. The S-type system secures the 35° diamond insert via a countersunk center hole screw, creating a perfectly flush head profile. This design opens maximum clearance for long, stringy swarf to escape without causing bird-nesting.
9. Technical Maintenance & Troubleshooting Guidelines
Equivalent Industry Models
Interchangeable globally with standard international metric S12M-SVJCR11 internal boring tool holders. For American or mixed imperial lathe turrets, this 12mm metric steel bar operates perfectly within 1/2-inch round split sleeves or reduction blocks, utilizing standard ANSI positive indexable insert designations **VCMT 221** or **VBMT 221 / 222**.
Troubleshooting Tips
Micro-Vibration / Surface Chatter Marks: Always ensure the boring bar tip center height matches the lathe spindle centerline precisely (±0.02mm). Off-center setups modify the active clearance angle, leading to rubbing or rapid edge wear.
Screw seized or stripped: Small M2.5 screws expand under high-speed cutting heat. Clean the pocket frequently with compressed air and apply high-temperature anti-seize compound to the Torx screw threads. Do not over-torque due to the delicate micro-pocket size.
Workpiece Material Matrix
Fully optimized across standard industrial engineering material codes: P (Carbon, Low-Alloy & Pre-hardened Mild Steels), M (Austenitic, Ferritic & Duplex Stainless steel grades), K (Grey & Ductile Cast Irons), N (Precision Aluminum Blanks, Copper, Brass Alloys & Polymers), and S (High-Temperature Superalloys & Titanium Alloys).
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.