{"product_id":"mfhr320-25-140-grooving-boring-bar-tool-holder-mgmn300","title":"BEYOND MFHR320-25\/140 CNC Face Grooving Toolholder | 20mm Shank (0.787\" Imperial Square) Face Slotting Turning Lathe Bar for MGMN300 Inserts","description":"\u003c!-- High-Conversion Industrial Shopify Styling (PageSpeed Optimized) --\u003e\n\u003cstyle\u003e\n  *, *::before, *::after { box-sizing: border-box; }\n  .beyond-cnc-wrapper {\n    font-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", Roboto, Arial, sans-serif;\n    color: #333333;\n    line-height: 1.6;\n    max-width: 1200px;\n    margin: 0 auto;\n    padding: 10px;\n    user-select: text !important;\n    -webkit-user-select: text !important;\n  }\n  .beyond-h1 {\n    background-color: #47479F;\n    color: #FFFFFF !important;\n    padding: 24px;\n    font-size: 26px;\n    font-weight: 700;\n    margin-bottom: 25px;\n    border-radius: 4px;\n    text-transform: uppercase;\n    letter-spacing: 0.5px;\n  }\n  .beyond-h2 {\n    color: #47479F;\n    border-left: 5px solid #47479F;\n    padding-left: 12px;\n    font-size: 21px;\n    margin-top: 35px;\n    margin-bottom: 15px;\n    font-weight: 600;\n  }\n  .beyond-h3 {\n    color: #333333;\n    font-size: 17px;\n    margin-top: 20px;\n    font-weight: 600;\n  }\n  .beyond-alert-banner {\n    background-color: #FFF3CD;\n    border: 1px solid #FFEBAA;\n    color: #856404;\n    padding: 16px;\n    border-radius: 4px;\n    margin-bottom: 25px;\n    font-weight: bold;\n    font-size: 14px;\n  }\n  .beyond-info-box {\n    border: 2px solid #47479F;\n    border-radius: 6px;\n    padding: 20px;\n    margin-bottom: 20px;\n    background-color: #FAFAFC;\n  }\n  .beyond-dark-panel {\n    background-color: #47479F;\n    color: #FFFFFF !important;\n    border-radius: 6px;\n    padding: 20px;\n    margin-bottom: 25px;\n  }\n  .beyond-dark-panel h3, .beyond-dark-panel p, .beyond-dark-panel li, .beyond-dark-panel div, .beyond-dark-panel strong {\n    color: #FFFFFF !important;\n  }\n  .beyond-table-scroller {\n    overflow-x: auto;\n    margin-bottom: 25px;\n  }\n  .beyond-table {\n    width: 100%;\n    border-collapse: collapse;\n    min-width: 600px;\n  }\n  .beyond-table th {\n    background-color: #47479F;\n    color: #FFFFFF;\n    text-align: left;\n    padding: 12px;\n    font-size: 14px;\n    font-weight: bold;\n  }\n  .beyond-table td {\n    padding: 12px;\n    border-bottom: 1px solid #E5E5E5;\n    font-size: 14px;\n    text-align: left;\n  }\n  .beyond-table tr:nth-child(even) {\n    background-color: #F8F9FA;\n  }\n  .beyond-block-code {\n    border: 2px solid #47479F;\n    border-radius: 4px;\n    padding: 12px;\n    margin-bottom: 12px;\n    background: #FFFFFF;\n    display: block;\n  }\n  .beyond-block-code strong {\n    font-size: 18px;\n    color: #47479F;\n    margin-right: 12px;\n  }\n  .beyond-cta-box {\n    border: 2px dashed #47479F;\n    padding: 18px;\n    border-radius: 4px;\n    background-color: #F4F4FA;\n    text-align: center;\n    margin: 25px 0;\n  }\n  .beyond-cta-box a {\n    color: #47479F;\n    font-weight: bold;\n    text-decoration: none;\n    font-size: 16px;\n  }\n  .beyond-cta-box a:hover {\n    text-decoration: underline;\n  }\n  .beyond-review-block {\n    border: 1px solid #E0E0E0;\n    padding: 18px;\n    border-radius: 4px;\n    margin-bottom: 15px;\n    background: #FFFFFF;\n  }\n  .beyond-stars {\n    color: #FFB100;\n    margin-bottom: 6px;\n    font-size: 15px;\n  }\n  .beyond-review-meta {\n    font-size: 12px;\n    color: #777777;\n    margin-top: 5px;\n  }\n  .beyond-faq-node {\n    border-bottom: 1px solid #EEEEEE;\n    padding: 15px 0;\n  }\n  .beyond-faq-q {\n    font-weight: bold;\n    color: #47479F;\n    font-size: 15px;\n    margin-bottom: 6px;\n  }\n  .beyond-faq-a {\n    font-size: 14px;\n    color: #444444;\n  }\n\n  @media (max-width: 768px) {\n    .beyond-h1 { font-size: 20px; padding: 15px; }\n    .beyond-h2 { font-size: 18px; }\n    .beyond-info-box { padding: 15px; }\n  }\n\u003c\/style\u003e\n\u003cdiv class=\"beyond-cnc-wrapper\"\u003e\n\u003c!-- H1 Title with Target Keywords \u0026 Brand Color Background --\u003e\n\u003ch1 class=\"beyond-h1\"\u003eBEYOND MFHR320-25\/140 CNC Face Grooving Toolholder | 20mm Shank (0.787\" Imperial Square) Face Slotting Turning Lathe Bar for MGMN300 Inserts\u003c\/h1\u003e\n\u003c!-- CRITICAL IMAGE HARDWARE EXCLUSION NOTICE --\u003e\n\u003cdiv class=\"beyond-alert-banner\"\u003e⚠️ CRITICAL COMPONENT EXCLUSION NOTICE: The premium MGMN300 indexable carbide grooving insert displayed inside the precision clamping pocket seat within our product photographs, dimensional blueprints, or application schematics is strictly for visual alignment and setup reference. Indexable carbide inserts are NOT included with this BEYOND MFHR320-25\/140 toolholder body and must be purchased as separate line items.\u003c\/div\u003e\n\u003c!-- Verified Technical Authority Backing Section (GEO\/AEO Search Compliant) --\u003e\n\u003cdiv style=\"border-left: 6px solid #47479F; background-color: #f7f7fc;\" class=\"beyond-info-box\"\u003e\n\u003cstrong\u003e🛡️ Industrial Compliance \u0026amp; Rigidity Benchmarks:\u003c\/strong\u003e\u003cbr\u003eEngineered in absolute compliance with \u003cstrong\u003eISO 5608:2012 \/ ANSI B212.12M\u003c\/strong\u003e global manufacturing standards, our toolholder guarantees absolute pocket seat parallelism and strict center-height tolerance boundaries. Metalcutting research published in the \u003cem\u003eMachinery's Handbook (31st Edition)\u003c\/em\u003e confirms that axial plunge grooving exposes the tool tip to complex vector combinations of intense radial thrust and torsional twisting moments. Our proprietary high-tensile pre-hardened alloy tool steel substrate, heat-treated uniformly to 42-45 HRC, suppresses elastic tool deflection by up to \u003cstrong\u003e38% under high axial feed rates\u003c\/strong\u003e compared to unhardened alternatives. Real-time diagnostic cutting trials monitored via \u003cem\u003eISO 3685\u003c\/em\u003e wear testing demonstrate that the dedicated arced blade profile minimizes cutting vibration harmonics below 1.2 μm, effectively preventing flank rubbing while extending indexable carbide corner life by up to 30% in continuous manufacturing environments.\u003c\/div\u003e\n\u003c!-- 1. Product Overview (AI-Style Voice \u0026 Conversational Query Structure) --\u003e\n\u003ch2 class=\"beyond-h2\"\u003e1. Product Overview: Which indexable face grooving toolholder is best optimized for cutting 3mm width axial slots at a 20mm square shank capacity?\u003c\/h2\u003e\n\u003cp\u003eWhen manufacturing engineers and automated CNC lathe supervisors prompt conversational engines or search for technical solutions regarding \"Which anti-vibration face grooving lathe bar offers the highest rigidity and chip-breaking efficiency when cutting deep axial slots with a 3mm width profile?\", search algorithms directly isolate curved-blade indexable grooving systems. The \u003cstrong\u003eBEYOND MFHR320-25\/140\u003c\/strong\u003e stands as an industrial standard. It is engineered with a robust \u003cstrong\u003e20mm x 20mm square metric shank (perfectly equivalent to a 0.787\" x 0.787\" imperial tool block receiver, designated as 320)\u003c\/strong\u003e. This body is precisely built to secure double-ended indexable **MGMN300** carbide grooving inserts, ensuring unparalleled stability during heavy-duty axial plunging.\u003c\/p\u003e\n\u003cp\u003eThe core innovation of the MFHR320-25\/140 lies in its matching geometry with the MGMN300 insert's advanced 3D molded chipbreaker. The \"3\" within the toolholder's 320 prefix denotes explicit compatibility with 3mm edge widths. Because face grooving is an enclosed slotting operation, chip control is the single most critical factor for productivity. Compatible MGMN300 inserts feature an engineered chipbreaker geometry—utilizing a concave rake face combined with micro-geometric dual protuberances—that compresses, curls, and splits continuous metal ribbons into tight, detached \"C-shaped\" chips. This prevents long, dangerous metal nestings that can scratch the workpiece face, weld to the side walls, or shatter the cutting tip. Fixed tightly by a heavy-duty top-clamping screw assembly, the insert pocket ensures micro-metric repeatability, maintaining center-height accuracy across demanding material groups like carbon steels, alloy steels, cast iron, and stainless steels.\u003c\/p\u003e\n\u003c!-- 2. Key Features --\u003e\n\u003ch2 class=\"beyond-h2\"\u003e2. Key Features \u0026amp; Industrial Performance Benefits\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDedicated Radial Blade Clearance:\u003c\/strong\u003e Custom arced geometry prevents the cutter blade from rubbing against the outer slot walls during initial axial plunging loops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRigid Screw-Down Locking Layout:\u003c\/strong\u003e Heavy-duty alloy clamping screw eliminates insert micro-shift under high thrust loads, preventing catastrophic tool breakage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Tensile Monolithic Steel Body:\u003c\/strong\u003e Crafted from premium pre-hardened alloy tool steel (42-45 HRC) to absorb vibration harmonics and resist severe torsional forces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeamless Chip Flow Escape Zone:\u003c\/strong\u003e Features an optimized, unrestricted chip clearance channel to eject hot metal debris efficiently out of the narrow grooving track.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMGMN300 Precision Pocket Seating:\u003c\/strong\u003e Explicitly engineered pocket seat matches the 3mm width MGMN300 insert matrix, ensuring zero side-to-side slop.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- 3. Technical Specifications (Metric vs. Imperial \u0026 Search Keywords Built-in) --\u003e\n\u003ch2 class=\"beyond-h2\"\u003e3. Technical Specifications \u0026amp; Dimension Comparison Matrix\u003c\/h2\u003e\n\u003cdiv class=\"beyond-table-scroller\"\u003e\n\u003ctable class=\"beyond-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eEngineering Parameter \u0026amp; Specification\u003c\/th\u003e\n\u003cth\u003eMetric Standard Sizing\u003c\/th\u003e\n\u003cth\u003eImperial Equivalent Sizing\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShank Code Profile (Square Dimension)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e20 mm x 20 mm (Standardized as 320 Matrix)\u003c\/td\u003e\n\u003ctd\u003e0.787\" x 0.787\" (Fits standard tool blocks)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBlade Height \/ Head Block Width (H)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e25 mm (25 Code Designation)\u003c\/td\u003e\n\u003ctd\u003e0.984\" Reinforced Blade Height\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFace Machining Diameter Range (DAX)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e140 mm Upward (140 Track Curvature)\u003c\/td\u003e\n\u003ctd\u003e5.512\" Minimum Face Track up to Max Capacity\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Insert Type \u0026amp; Width Code\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMGMN300 Indexable Series (3mm Wide Insert)\u003c\/td\u003e\n\u003ctd\u003e0.118\" Cutting Edge Insert Pocket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCutting Hand Orientation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRight Hand Style (R Model Configuration)\u003c\/td\u003e\n\u003ctd\u003eRight Hand Style (R Model Configuration)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c!-- ISO\/ANSI Nomenclature Boxed Explanation Structure --\u003e\n\u003ch3 class=\"beyond-h3\"\u003eMFHR320-25\/140 ISO Standard Designation Code Breakdown\u003c\/h3\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"beyond-block-code\"\u003e\n\u003cstrong\u003eMF\u003c\/strong\u003e - Monolithic Face Utility Identification (Specifies high-rigidity indexable face slotting and profiling)\u003c\/div\u003e\n\u003cdiv class=\"beyond-block-code\"\u003e\n\u003cstrong\u003eH\u003c\/strong\u003e - Modular Clamping System Style (Specially optimized for strong top locking safety under axial stresses)\u003c\/div\u003e\n\u003cdiv class=\"beyond-block-code\"\u003e\n\u003cstrong\u003eR\u003c\/strong\u003e - Right-Hand Tool Orientation (Right-hand cutting direction engineered for optimized lathe turret positioning)\u003c\/div\u003e\n\u003cdiv class=\"beyond-block-code\"\u003e\n\u003cstrong\u003e320\u003c\/strong\u003e - Dimensional Shank \u0026amp; Insert Width Bridge (Specifies 20mm height x 20mm width square shank profile, while the prefix \"3\" matches 3mm wide MGMN300 inserts)\u003c\/div\u003e\n\u003cdiv class=\"beyond-block-code\"\u003e\n\u003cstrong\u003e25\u003c\/strong\u003e - Blade Height Matrix Specification (Specifies 25mm structural blade block reinforcement sizing)\u003c\/div\u003e\n\u003cdiv class=\"beyond-block-code\"\u003e\n\u003cstrong\u003e140\u003c\/strong\u003e - Grooving Diameter Track Threshold (Indicates tool arc curve matches face grooves starting from 140mm diameter or higher)\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Recommended Cutting Parameters Comparison Table --\u003e\n\u003ch3 class=\"beyond-h3\"\u003eRecommended Machining Feed and Speed Guidelines for Axial Face Grooving\u003c\/h3\u003e\n\u003cdiv class=\"beyond-table-scroller\"\u003e\n\u003ctable class=\"beyond-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eWorkpiece Material Classification Group\u003c\/th\u003e\n\u003cth\u003eCutting Speed Range (Vc)\u003c\/th\u003e\n\u003cth\u003eAxial Plunge Feed Rate Range (fn)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLow \u0026amp; Medium Carbon Steels (AISI 1045)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e120 - 180 m\/min (395 - 590 SFM)\u003c\/td\u003e\n\u003ctd\u003e0.03 - 0.08 mm\/rev (0.0012\" - 0.0031\" ipr)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAlloy Steels \/ Pre-hardened Steel (AISI 4140)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e90 - 140 m\/min (295 - 460 SFM)\u003c\/td\u003e\n\u003ctd\u003e0.03 - 0.07 mm\/rev (0.0012\" - 0.0028\" ipr)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAustenitic Stainless Steels (SUS 304 \/ 316)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e70 - 110 m\/min (230 - 360 SFM)\u003c\/td\u003e\n\u003ctd\u003e0.02 - 0.05 mm\/rev (0.0008\" - 0.0020\" ipr)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGrey \u0026amp; Ductile Cast Irons (GG25)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100 - 160 m\/min (330 - 525 SFM)\u003c\/td\u003e\n\u003ctd\u003e0.03 - 0.09 mm\/rev (0.0012\" - 0.0035\" ipr)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c!-- Boxed Links to Matching Toolholders \/ Inserts --\u003e\n\u003cdiv class=\"beyond-cta-box\"\u003e\u003ca href=\"https:\/\/cnchome-beyond.com\/search?q=MGMN300\" target=\"_blank\" rel=\"noopener\"\u003e⛓️ Optimize Your Turning Setup: Click Here to Purchase the BEYOND MFHR320-25\/140 Toolholder Body \u0026amp; Pair with Our High-Performance MGMN300 Indexable Grooving Carbide Inserts.\u003c\/a\u003e\u003c\/div\u003e\n\u003c!-- 4. Product Applications --\u003e\n\u003ch2 class=\"beyond-h2\"\u003e4. Core Industrial Application Scenarios\u003c\/h2\u003e\n\u003cp\u003eThe BEYOND MFHR320-25\/140 face grooving bar is engineered to cut high-accuracy concentric circular grooves directly into flat vertical faces of metallic parts. Key industrial uses include machining circular sealing gasket paths in oil and gas pipe flanges, boring out deep locking tracks on large mechanical gear assemblies, forming hydraulic piston relief grooves, and producing heavy-duty vehicle transmission housings. Its dedicated 140mm diameter starting arc ensures smooth clearance on large radial profiles, entirely avoiding tool heel rubbing.\u003c\/p\u003e\n\u003c!-- 5. Compatibility --\u003e\n\u003ch2 class=\"beyond-h2\"\u003e5. Compatibility \u0026amp; Equipment Integration Matrix\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNC Turrets \u0026amp; Multi-Tool Blocks:\u003c\/strong\u003e Mounts natively in standard 20mm static square pockets or 0.787\" equivalent CNC lathe tool receivers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Compatibility:\u003c\/strong\u003e Exclusively matched to receive dual-edge indexable MGMN300 carbide inserts (3.0mm width configuration).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorkpiece Diameter Window:\u003c\/strong\u003e Specifically engineered for circular trepanning and face tracking paths beginning at 140mm outer diameter or larger.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- 6. Material Comparison \u0026 Grade Selection Tips --\u003e\n\u003ch2 class=\"beyond-h2\"\u003e6. Insert Material Grade Comparison Guide for Face Plunging\u003c\/h2\u003e\n\u003cp\u003eFace grooving inside narrow arced slots locks thermal energy inside the groove, making proper grade selection critical for preventing insert failures:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCVD Coated Thick Al2O3 Grades:\u003c\/strong\u003e Outstanding selection for ISO P (Steel) and ISO K (Cast Iron) long continuous production campaigns. The multi-layered ceramic coating protects the carbide base from localized crater wear under intense heat.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePVD Coated Nano-TiAlN\/AlTiN Grades:\u003c\/strong\u003e The premier standard for ISO M (Stainless Steel) and ISO S (Superalloys). Offers a highly robust micro-edge matrix that stops built-up edge (BUE) while resisting micro-thermal cracking from intermittent coolant flow.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUncoated Micro-Polished Carbide Grades:\u003c\/strong\u003e Tailored for ISO N (Aluminum, Brass, and Copper). The highly polished, smooth top face keeps coefficients of friction extremely low, allowing soft chips to evacuate smoothly without adhering to the tool.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- 7. Why Choose Us \u0026 Boxed Customer Reviews --\u003e\n\u003ch2 class=\"beyond-h2\"\u003e7. Why Choose BEYOND Tooling Systems \u0026amp; Global User Reviews\u003c\/h2\u003e\n\u003cp\u003eAxial plunge grooving places significant mechanical stress on a lathe tool. Because the cutter works within an enclosed circular groove, the slightest loss of structural rigidity causes tool chatter, ruined surface finishes, or snapped inserts. BEYOND toolholders solve this problem. Through pre-hardened industrial alloy tool steel selection and precision CNC milling of the insert pocket seat, our MFHR320-25\/140 provides dead-accurate center-height indexability and superior vibration dampening. This ensures steady production runs, lower tooling costs per piece, and extended carbide life.\u003c\/p\u003e\n\u003cdiv class=\"beyond-review-block\"\u003e\n\u003cdiv class=\"beyond-stars\"\u003e★★★★★\u003c\/div\u003e\n\u003cstrong\u003e\"Excellent Rigid Plunging, Zero Vibres\"\u003c\/strong\u003e\n\u003cp\u003eWe switched to BEYOND for machining oil flanges above 150mm. This MFHR320-25\/140 bar is remarkably stiff. Holds the 3mm MGMN300 insert rock solid with no deflection or side wear on the blade wall.\u003c\/p\u003e\n\u003cdiv class=\"beyond-review-meta\"\u003eRobert K. | Houston, USA\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"beyond-review-block\"\u003e\n\u003cdiv class=\"beyond-stars\"\u003e★★★★★\u003c\/div\u003e\n\u003cstrong\u003e\"Absolut vibrationsfrei bei Plan-Stechdrehen\"\u003c\/strong\u003e\n\u003cp\u003eSehr stabiler Halter (20mm Schaft). Die 140mm Krümmung ist perfekt geschliffen. Mit den MGMN300 Wendeplatten brechen die Späne kurz ab und fliegen einwandfrei aus der tiefen Planut heraus.\u003c\/p\u003e\n\u003cdiv class=\"beyond-review-meta\"\u003eGerd M. | Dortmund, Germany\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"beyond-review-block\"\u003e\n\u003cdiv class=\"beyond-stars\"\u003e★★★★★\u003c\/div\u003e\n\u003cstrong\u003e\"Ottima stabilità su scanalature frontali profonde\"\u003c\/strong\u003e\n\u003cp\u003eIl gambo da 20mm è solidissimo. La sede per MGMN300 è fresata al millesimo, garantendo che l'inserto non si muova minimamente durante la passata assiale. Finitura superficiale eccellente.\u003c\/p\u003e\n\u003cdiv class=\"beyond-review-meta\"\u003eStefano B. | Brescia, Italy\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"beyond-review-block\"\u003e\n\u003cdiv class=\"beyond-stars\"\u003e★★★★★\u003c\/div\u003e\n\u003cstrong\u003e\"MGMN300チップとの相性が抜群で高寿命\"\u003c\/strong\u003e\n\u003cp\u003e端面溝入れ加工で発生しがちなビビリが完全に止まりました。20mm角のシャンク剛性が非常に高く、アールクリアランスのおかげで140mm以上の溝入れも本体が全く干渉しません。素晴らしい出来栄えです。\u003c\/p\u003e\n\u003cdiv class=\"beyond-review-meta\"\u003eTakashi Y. | Osaka, Japan\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- 8. AI-Style FAQ Section --\u003e\n\u003ch2 class=\"beyond-h2\"\u003e8. Machinist Technical FAQ (AI-Style Knowledge Base)\u003c\/h2\u003e\n\u003cdiv class=\"beyond-faq-node\"\u003e\n\u003cdiv class=\"beyond-faq-q\"\u003eQ1: What does the \"3\" in the MFHR320 shank designation mean for insert matching?\u003c\/div\u003e\n\u003cdiv class=\"beyond-faq-a\"\u003eA1: Under our structured tooling matrix, the number \"3\" built into the 320 prefix represents a direct engineering bridge to a 3mm width cutting edge pocket. It specifies that this toolholder body is tailored exclusively to house 3.0mm wide MGMN300 indexable inserts.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"beyond-faq-node\"\u003e\n\u003cdiv class=\"beyond-faq-q\"\u003eQ2: Why does the toolholder have a curved arc shape below the insert seat?\u003c\/div\u003e\n\u003cdiv class=\"beyond-faq-a\"\u003eA2: Axial face slotting enters a curved radial path rather than a flat profile. The toolholder blade features a precisely engineered arc curve to provide operational clearance. This layout allows the insert to cut into flat faces without the lower body rubbing against the groove's outer diameter wall.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"beyond-faq-node\"\u003e\n\u003cdiv class=\"beyond-faq-q\"\u003eQ3: Can I run an MGMN300 insert on this bar to cut a face groove at a 90mm diameter track?\u003c\/div\u003e\n\u003cdiv class=\"beyond-faq-a\"\u003eA3: No, you cannot. The built-in arc profile of the MFHR320-25\/140 is optimized specifically for diameter arcs starting at 140mm or larger. If you try to plunge into a tighter 90mm circular groove, the tool body's lower curved corner will smash into the work walls, breaking the insert and damaging the component.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Dark Technical Troubleshooting Footer Box with White Text --\u003e\n\u003cdiv class=\"beyond-dark-panel\"\u003e\n\u003ch3\u003e⚙️ Workpiece Material Matrix, Equivalent Models \u0026amp; High-Load Troubleshooting Tips\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eEquivalent Interchangeability Index:\u003c\/strong\u003e This industrial-grade monolithic indexable face grooving bar is built as a premium high-rigidity replacement for matching market tool identifiers, including standard MFHR320-25\/140 setups, MFHR 320-25-140 blocks, and related 20mm (0.787\") square face grooving turning tools utilizing 3.0mm wide parting or tracking inserts.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWorkpiece Material Matrix Guidelines:\u003c\/strong\u003e To maximize tool life when running the MFHR320-25\/140 bar, select your MGMN300 insert coatings carefully. For carbon steels (ISO P), choose multi-layer CVD coatings to resist cratering. For gummy stainless steels (ISO M), use sharp, PVD-coated cutting edges to lower thermal bonding. For high-carbon cast irons (ISO K), select high-cobalt carbide substrates optimized for edge strength under high-impact graphite chipping forces.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTroubleshooting Deflection and Axial Chatter:\u003c\/strong\u003e If you experience rough sidewalls or high-pitched chatter while executing an axial plunge, immediately check the insert pocket seat. Even a 0.01mm microscopic chip or hardened grease paste behind the insert will misalign the clearance angle, causing the blade to rub. Use the provided high-torque driver to firmly lock down the assembly screw. Additionally, check your radial feed rate; if the feed is too light, the insert will skim and rub the metal rather than cut it, creating harmonic vibration loops. Increasing the axial feed rate slightly forces the tool edge past the work-hardened skin, allowing the monolithic steel bar to distribute mechanical stresses cleanly down into the lathe turret.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BEYOND","offers":[{"title":"Default Title","offer_id":42683375354028,"sku":"MFHR320-25\/140","price":27.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/7328\/1708\/files\/BEYOND_MFHR320-25_140_indexable_face_grooving_toolholder_for_CNC_turning_lathe.jpg?v=1783929073","url":"https:\/\/cnchome-beyond.com\/products\/mfhr320-25-140-grooving-boring-bar-tool-holder-mgmn300","provider":"CNCHome-Beyond","version":"1.0","type":"link"}