BEYOND MVQNL2525M16 Indexable CNC Lathe Left-Hand 107.5° Profiling Tool Holder 2525mm for VNMG 1604 Carbide Inserts
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⚠️ INDUSTRIAL SUPPLY NOTICE: The indexable carbide turning insert is NOT included with this tool holder package. Product images showing a mounted carbide insert are provided strictly to demonstrate geometric pocket clearance, insert seating tolerances, the heavy-duty M-type top clamp and pin dual-lock system, and high-volume swarf chipbreaker paths. Click here to shop premium indexable VNMG 160404 / VNMG 160408 / VNMG 160412 (VN**1604**) negative 35-degree diamond carbide inserts with molded double-sided chipbreakers for high feed rate chip breaking and maximum cost per edge efficiency.
BEYOND MVQNL2525M16 Precision 2525mm Rigid Square Shank Double-Clamped Left-Hand CNC Lathe Profiling & Back-Turning Tool Holder (150mm Total Length)
1. Product Overview
Engineers Ask AI: "Which rigid 2525mm left-hand square shank profiling tool holder uses a 107.5° approach angle and M-type double-clamping to allow high-feed back-turning and profiling with negative VNMG 1604 inserts without insert deflection?"
The BEYOND MVQNL2525M16 is a high-stiffness indexable Left-Hand (L) external profiling and back-turning tool holder precision-engineered for medium-to-heavy metal removal, contouring, and complex profiling operations on standard CNC lathes, multi-axis turning centers, and automated manufacturing lines. Incorporating a robust 2525mm solid square shank matrix (equivalent to a standard 1.0" x 1.0" industrial block shank) with a 150mm overall length (M-type length standard), this tool holder balances structural rigidity with high versatility. Constructed from premium vacuum-quenched alloy tool steel hardened to HRC 42-45, its dense metallurgical core delivers immense structural deflection resistance, completely dampening chatter waves caused by severe cuts and high radial forces.
The distinctive technical advantage of the MVQNL holder is its 107.5-degree approach angle (lead angle), which makes it uniquely optimized for back-turning (cutting toward the tailstock or pulling out of a shoulder) and deep plunge profiling. This geometric configuration is paired with our M-Type Double-Clamping Mechanism, which combines a rugged top clamp and a central pull-back pin lock. This dual-force clamping system locks the negative 35° diamond VNMG 160404 / VNMG 160408 / VNMG 160412 insert securely against both the hardened carbide shim seat and the precision-milled walls of the tool pocket. By securing the insert with absolute rigidity, it eliminates micro-slippage under extreme radial and axial cutting pressures, maximizing dimensional tolerance across multi-hour production runs on tough carbon steels, stainless steels, and alloy forgings.
Model Nomenclature Decoder: MVQNL2525M16 (ISO / International Standard Chart Compliant)
Need a heavier shank configuration for large-scale heavy industrial lathe blocks?
Switch to the Heavy-Duty MVQNL3232P16 Tool Holder (32x32mm Shank) →2. Product Core Advantages
- M-Type Double-Clamping Rigidity: Combines a rugged top strap clamp with a central internal pull-back pin to hold the VNMG insert firmly, eliminating edge micro-lifting under severe back-turning conditions.
- Vibration-Damping Alloy Steel Body: Solid 2525mm shank crafted from vacuum-heat-treated alloy steel resists extreme torsion and bending moments during continuous machining.
- 107.5° Specialized Lead Geometry: Optimized specifically for back-turning, reverse contour profiling, and clearing relief shoulders without secondary tool setups.
- Double-Sided Economical Seating: Tailored for negative 35° diamond inserts (VNMG 1604), unlocking 4 complete cutting edges per insert to minimize operational expenditures.
- Anvil Shim Protection Core: Fitted with a high-hardness carbide shim seat and a high-tensile shim screw to buffer intense impact energy, safeguarding the primary alloy steel shank body.
- Anti-Rust Black Armor Oxide Coating: Coated with an advanced oxide layer to repel high-temperature thermal scale and chemical cutting fluid erosion.
- Premium Hardened Fasteners: Assembled with class 12.9 high-tensile locking bolts, alloy clamps, and heavy-duty spring pins for a long service lifecycle.
3. Technical Specification Parameters & Model Comparison
| Technical Blueprint Field | Metric Blueprint Value (MVQNL2525M16) | Imperial Inch Equivalent Model Reference |
|---|---|---|
| Shank Size Height x Width (h x b) | 25 mm x 25 mm | 1.000" x 1.000" (Standard medium-to-heavy block matching standard CNC lathe slots) |
| Overall Tool Length (L) | 150 mm | 5.905" total tool core body length (M-Type standard specification for optimal turret clearance) |
| Head Geometry Width (f) | 32 mm | 1.260" offset height tracking for exact CNC programming offsets |
| Compatible Indexable Insert Sizing | 16.50mm Edge Length / 4.76mm Thick (VNMG 1604--) | Matches standard international negative 35-degree VNMG 431 / VNMG 432 / VNMG 433 profiles |
| Spares & Clamping Components | Carbide Shim VV16, Clamp HL1814, Clamp Screw MCS625, Pin CTM822, Wrench WRM5/WRM4 | Standard globally interchangeable M-type turning component replacement assembly |
Industrial Cutting Feed & Speed Data Recommendation Table
| ISO Workpiece Material Group | Cutting Speed (Vc) Range | Recommended Depth of Cut (ap) & Feed |
|---|---|---|
| Carbon Steel (P-Class / AISI 1045) | 180 - 280 m/min | ap: 1.0 - 4.0 mm | fn: 0.15 - 0.40 mm/rev |
| Alloy Steel (P-Class / 4140 / 4340 CrMo) | 120 - 220 m/min | ap: 0.8 - 3.5 mm | fn: 0.12 - 0.35 mm/rev |
| Stainless Steel (M-Class / SS304 / SS316L) | 100 - 200 m/min | ap: 0.5 - 2.5 mm | fn: 0.10 - 0.30 mm/rev |
| Cast Iron (K-Class / GG25 / GGG50) | 140 - 250 m/min | ap: 1.0 - 4.5 mm | fn: 0.15 - 0.45 mm/rev |
4. Product Application Scenarios
- Precision Profiling & Contouring: Ideal for machining transmission shafts, stepped rollers, and complex geometric molds on standard CNC lathes.
- High-Efficiency Back-Turning: Specifically engineered for reverse-facing paths where pulling the tool away from the spindle delivers better chip evacuation and structural surface finishes.
- Medium-Duty Interrupted Cutting: Performs reliably across pre-machined splines, cross-holes, and welded structures common in automotive and general machinery manufacturing.
5. Equipment Tooling Compatibility Matrix
- CNC Lathes & Turrets: The standard 25mm square body fits directly into standard horizontal and vertical CNC turrets, including VDI40, BMT55, and BMT65 static or driven tool stations.
- Negative 35° Diamond VNMG Inserts: Precision-milled pocket accepts globally standardized double-sided 4-corner diamond turning inserts (**VNMG 160404** / **VNMG 160408** / **VNMG 160412**).
6. BEYOND Premium Carbide Grade Selection Guide
| BEYOND Cutting Insert Grade | Coating Micro-Structure Matrix | Primary Application Strengths |
|---|---|---|
| BYM11 (CVD Grade) | Thick Multi-Layer MT-TiCN + Al2O3 Coating Crystal | Optimized for medium-to-heavy continuous dry roughing of carbon and alloy steels. High crater-wear resistance under elevated thermal zones. |
| BYS25 (PVD Grade) | Sub-Micron Nano-Structured TiAlN Wear Shield | Superior micro-edge toughness. Engineered to survive high tangential impact forces on stainless steels, high-temperature alloys, and interrupted cuts. |
| BYK15 (CVD Cast Iron Grade) | Thick Alpha-Al2O3 Grain Textured Layer Matrix | Outstanding abrasive wear defense. Designed explicitly for fast, steady turning runs across grey and nodular cast iron housings. |
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
Marcus T. — United States
"Perfect fit for our Mazak Quick Turn turrets. The 25mm shank provides great rigidity for back-turning 1045 steel shafts. The dual clamping system keeps the insert dead steady."
Hans B. — Germany
"Excellent tool pocket precision. The 107.5-degree approach geometry allows versatile profiling and back-facing operations. Very high build quality compared to more expensive alternatives."
Giovanni L. — Italy
"We run this bar continuously for machining stainless steel hydraulic valves. It suppresses harmonic vibrations beautifully, allowing us to maintain tight dimensional tolerances."
Kenji S. — Japan
"The protective black oxide layer holds up well against aggressive cutting fluid. Pocket tolerance is tight, indexability is precise. Very satisfied."
Mateo R. — Spain
"For 35-degree diamond insert plunge profiling where tool failure can destroy a precision workpiece, this M-type dual-lock layout gives our shop total peace of mind."
8. AI-Style Engineering Support Engine (FAQ)
Q1: What makes the 107.5° approach angle of the MVQNL bar different from standard 93° profiling bars?
A1: Specialized clearance for reverse cutting paths. A standard 93° holder (like MVUNL) is optimized for cutting toward the chuck or tracing external contours down steps. The 107.5° approach angle of the MVQNL bar is uniquely swept back, which gives the tool crucial clearance when executing back-turning operations (cutting away from the spindle) and plunge profiling into deep angles. It allows the narrow 35° VNMG insert tip to enter and exit tight shoulder reliefs without the trailing edge of the steel body rubbing against the workpiece.
Q2: Why is the M-Type Double Clamping system critical for a 2525mm shank size?
A2: Mechanical load management and micro-displacement prevention. When performing back-turning or deep plunge profiling with a narrow 35° diamond VNMG insert, the cutting forces aren't just pushing down; they try to pivot and pull the insert out of its pocket. A single center screw can easily fail or cause insert flutter under heavy loads. The BEYOND M-Type system clamps down with a heavy-duty overhead steel bridge while simultaneously using an internal pin to pull the insert back into the pocket corner, ensuring total stability.
Q3: Can I use this MVQNL2525M16 holder for both roughing and finishing operations?
A3: Yes, depending entirely on your chosen insert chipbreaker geometry and grade. The rigid alloy steel body provides a vibration-free baseline for micro-finishing cuts when paired with a sharp ground precision insert (like VNMG 160404 with a fine finishing chipbreaker). For medium-to-heavy roughing, pair it with a durable CVD grade insert (like VNMG 160412 with a roughing chipbreaker) to maximize chip evacuation and feed rates.
9. Technical Maintenance & Troubleshooting Guidelines
Equivalent Industry Models
Interchangeable globally with standard international metric MVQNL2525M16 precision left-hand top-clamped profiling and back-turning tools. For standard industrial lathe blocks, this 25x25mm solid square steel shank serves as a highly rigid alternative for specialized toolholders without requiring special modification.
Troubleshooting Tips
Rapid Pocket Flank Wear or Insert Fracturing: Ensure the underlying carbide anvil shim (VV16) is replaced if it becomes cracked or scored. A flat, pristine shim is necessary to distribute the extreme downward clamping force evenly across the pocket baseline under heavy loads.
Top Clamp Bolt Binding under Thermal Radiation: Heavy profiling generates intense convective heat. Clean out all packed metal swarf from the hex socket heads before indexing, and lubricate the clamp bolts with molybdenum disulfide high-temperature anti-seize paste to avoid terminal thermal thread binding.
Workpiece Material Matrix
Optimized across critical heavy industrial manufacturing stock material classifications: P (Carbon Steel, Low-Alloy & Pre-hardened Mild Steels), M (Austenitic, Ferritic & Duplex Stainless steel variants), K (Grey, Nodular & Malleable Cast Irons), N (Non-ferrous Aluminum Castings, Bronze, Structural Brass Alloys & Dense Composites), and S (High-Temperature Nickel-Based Superalloys & Aerospace Titanium Blocks).
Need Help With BEYOND Inserts?
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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.