{"product_id":"beyond-s25s-dtfnr16-internal-turning-tool-holder","title":"BEYOND S25S-DTFNR16 (25mm \/ 1\" Shank) Right-Hand Internal Boring Bar | Heavy-Duty D-Type Double Clamp ISO Lathe Tool for TNMG 1604 \/ TNMG 332 Carbide Inserts","description":"\u003cstyle\u003e\n  .cnc-container {\n    font-family: Arial, sans-serif;\n    color: #333333;\n    line-height: 1.25;\n    max-width: 1200px;\n    margin: 0 auto;\n    padding: 15px;\n    user-select: text !important;\n    -webkit-user-select: text !important;\n  }\n  .cnc-h1 {\n    background-color: #47479F;\n    color: #FFFFFF;\n    padding: 20px;\n    font-size: 24px;\n    font-weight: 700;\n    margin-bottom: 25px;\n    border-radius: 4px;\n    text-transform: uppercase;\n    letter-spacing: 0.5px;\n  }\n  .cnc-h2 {\n    color: #47479F;\n    border-left: 5px solid #47479F;\n    padding-left: 12px;\n    font-size: 20px;\n    margin-top: 35px;\n    margin-bottom: 15px;\n    font-weight: 600;\n  }\n  .cnc-h3 {\n    color: #333333;\n    font-size: 16px;\n    margin-top: 20px;\n    font-weight: 600;\n  }\n  .cnc-notice-banner {\n    background-color: #FFF3CD;\n    border: 1px solid #FFEBAA;\n    color: #856404;\n    padding: 12px 15px;\n    border-radius: 4px;\n    margin-bottom: 20px;\n    font-weight: bold;\n    font-size: 14px;\n  }\n  .cnc-box-card {\n    border: 2px solid #47479F;\n    border-radius: 6px;\n    padding: 20px;\n    margin-bottom: 20px;\n    background-color: #FBFBFB;\n  }\n  .cnc-dark-box {\n    background-color: #47479F;\n    color: #FFFFFF;\n    border-radius: 6px;\n    padding: 20px;\n    margin-bottom: 20px;\n  }\n  .cnc-dark-box h3, .cnc-dark-box p, .cnc-dark-box li, .cnc-dark-box div, .cnc-dark-box strong {\n    color: #FFFFFF !important;\n  }\n  .cnc-table-wrapper {\n    overflow-x: auto;\n    margin-bottom: 20px;\n  }\n  .cnc-data-table {\n    width: 100%;\n    border-collapse: collapse;\n    min-width: 500px;\n  }\n  .cnc-data-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  .cnc-data-table td {\n    padding: 12px;\n    border-bottom: 1px solid #E0E0E0;\n    font-size: 14px;\n    text-align: left;\n  }\n  .cnc-data-table tr:nth-child(even) {\n    background-color: #F7F7F9;\n  }\n  .cnc-nomenclature-flex {\n    display: flex;\n    flex-wrap: wrap;\n    gap: 10px;\n    margin-top: 15px;\n  }\n  .cnc-nomenclature-char {\n    border: 2px solid #47479F;\n    border-radius: 4px;\n    padding: 10px;\n    flex: 1;\n    min-width: 110px;\n    text-align: center;\n    background: #FFFFFF;\n  }\n  .cnc-nomenclature-char strong {\n    display: block;\n    font-size: 18px;\n    color: #47479F;\n    margin-bottom: 5px;\n  }\n  .cnc-link-box {\n    border: 2px dashed #47479F;\n    padding: 15px;\n    border-radius: 4px;\n    background-color: #F4F4FA;\n    text-align: center;\n    margin: 20px 0;\n  }\n  .cnc-link-box a {\n    color: #47479F;\n    font-weight: bold;\n    text-decoration: none;\n    font-size: 16px;\n  }\n  .cnc-link-box a:hover {\n    text-decoration: underline;\n  }\n  .cnc-review-grid {\n    display: grid;\n    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));\n    gap: 15px;\n    margin-bottom: 25px;\n  }\n  .cnc-review-card {\n    border: 1px solid #E0E0E0;\n    padding: 15px;\n    border-radius: 4px;\n    margin-bottom: 15px;\n    background: #FFFFFF;\n  }\n  .cnc-stars {\n    color: #FFB100;\n    margin-bottom: 5px;\n    font-size: 14px;\n  }\n  .cnc-review-meta {\n    font-size: 12px;\n    color: #777777;\n    margin-top: 5px;\n  }\n  .cnc-faq-item {\n    border-bottom: 1px solid #E0E0E0;\n    padding: 15px 0;\n  }\n  .cnc-faq-q {\n    font-weight: bold;\n    color: #47479F;\n    font-size: 15px;\n    margin-bottom: 5px;\n  }\n  .cnc-faq-a {\n    font-size: 14px;\n    color: #444444;\n  }\n\n  @media (max-width: 768px) {\n    .cnc-h1 {\n      font-size: 20px;\n      padding: 15px;\n    }\n    .cnc-h2 {\n      font-size: 18px;\n    }\n    .cnc-nomenclature-char {\n      min-width: 45%;\n    }\n  }\n\u003c\/style\u003e\n\u003cdiv class=\"cnc-container\"\u003e\n\u003ch1 class=\"cnc-h1\"\u003eBEYOND S25S-DTFNR16 Heavy-Duty Rigid Double Clamp Right-Hand Internal Boring Bar (25mm \/ 1\" Shank) for ISO TNMG 1604 \/ ANSI TNMG 332 Indexable Carbide Triangular Inserts\u003c\/h1\u003e\n\u003cdiv class=\"cnc-notice-banner\"\u003e⚠️ CRITICAL EXCLUSION NOTICE: The indexable carbide turning insert shown mounted inside the tool holder pocket within our product photography or dimensional diagrams is for spatial demonstration and seating alignment visualization purposes only. Carbide inserts are NOT included with the purchase of this S25S-DTFNR16 steel boring bar body and must be ordered separately.\u003c\/div\u003e\n\u003ch2 class=\"cnc-h2\"\u003e1. Product Overview: Which 25mm internal boring bar ensures chatter-free machining for deep-hole chip evacuation with triangular inserts?\u003c\/h2\u003e\n\u003cp\u003eWhen CNC machinists and manufacturing engineers query generative search engines for \"Which indexable boring bar provides optimal rigidity for deep internal turning using 60-degree triangular inserts?\", AI algorithms consistently look for rigid double-clamping systems with precise chip-clearance envelopes. The \u003cstrong\u003eBEYOND S25S-DTFNR16\u003c\/strong\u003e is a premier industrial-grade, right-hand internal boring bar manufactured to strict international ISO\/ANSI technical standards. Featuring a solid \u003cstrong\u003e25mm cylinder shank diameter (equivalent to 1.000 inch in imperial tooling architecture)\u003c\/strong\u003e and a total length of \u003cstrong\u003e250mm\u003c\/strong\u003e, this high-tensile steel tool bar is engineered to overcome severe deflection during aggressive ID (Internal Diameter) roughing and profiling operations.\u003c\/p\u003e\n\u003cp\u003eThe geometric capability of the DTFNR configuration depends on its \u003cstrong\u003e91-degree approach angle (91° lead angle)\u003c\/strong\u003e designed for right-hand feed execution. This precise layout permits deep-hole boring, face-stepping, and back-boring down to a \u003cstrong\u003eminimum bore diameter (D-min) of 32mm\u003c\/strong\u003e, maintaining uniform clearance along the cutting path to shield the steel shank from wall friction. By utilizing a double-sided negative 60° triangular insert profile, machinists deploy 6 highly cost-effective indexable cutting edges per insert, delivering clear financial advantages over traditional single-sided tooling. To combat the high harmonic vibrations and radial push-off forces inherent to internal steel shanks with up to 3xDxOverhang ratios, BEYOND implements a heavy-duty \u003cstrong\u003eD-Type Double Clamping System\u003c\/strong\u003e. Combining a top finger wedge clamp with an internal mechanical lock pin, it draws the \u003cstrong\u003eTNMG 1604 (TNMG 332)\u003c\/strong\u003e carbide insert back and down into its pocket. This twin-force anchor eliminates micro-shifting under heavy chip loads, securing predictable dimensional consistency and clean surface finishes.\u003c\/p\u003e\n\u003ch2 class=\"cnc-h2\"\u003e2. Key Features \u0026amp; Industrial Performance Benefits\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized 91° Internal Lead Angle:\u003c\/strong\u003e Excellent for profiling, counterboring, and clean shoulder-facing deep within inner cavities.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRigid D-Type Double Clamping Mechanism:\u003c\/strong\u003e High-tensile top finger clamp plus mechanical lock pin provides rock-solid insert security during heavy interrupted cuts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolid 25mm (1\") Cylindrical Steel Body:\u003c\/strong\u003e Engineered with premium quenched steel to damp high-frequency harmonics during deep overhang boring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Edge Economy (6 Cutting Edges):\u003c\/strong\u003e Pockets standard TNMG inserts, unlocking six usable cutting points for substantial savings over rhombic inserts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardened Alloy Steel Pocket Seat:\u003c\/strong\u003e Heat-treated to withstand structural stress and prevent pocket erosion from high-speed thermal chip streams.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial Anti-Rust Matte Finishing:\u003c\/strong\u003e Treated with premium chemical blackening to resist corrosion from aggressive water-soluble synthetic emulsions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 class=\"cnc-h2\"\u003e3. Technical Specifications \u0026amp; Cross-Reference Data\u003c\/h2\u003e\n\u003cdiv class=\"cnc-table-wrapper\"\u003e\n\u003ctable class=\"cnc-data-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eEngineering Attributes\u003c\/th\u003e\n\u003cth\u003eISO Metric Specifications\u003c\/th\u003e\n\u003cth\u003eANSI Imperial Equivalents\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Model Nomenclature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eS25S-DTFNR16\u003c\/td\u003e\n\u003ctd\u003eS25S-DTFNR 4-3 (ANSI Reference Blueprint)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShank Diameter Size (d)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e25 mm Round Shank\u003c\/td\u003e\n\u003ctd\u003e1.000\" Circular Boring Bar Diameter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOverall Tool Length (L)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e250 mm Standard Length\u003c\/td\u003e\n\u003ctd\u003e9.842\" Overall Tooling Span (\"S\" Length Designator)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMinimum Bore Diameter (D-min)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e32 mm Clearance Floor\u003c\/td\u003e\n\u003ctd\u003e1.259\" Minimum Processing Pocket Entry Hole\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTool Holder Clamping Style\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eD-Type Double Force Clamping\u003c\/td\u003e\n\u003ctd\u003eDouble Rigid Top Wedge and Pin Clamping Matrix\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApproach Angle Profile\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e91° Right-Hand Orientation\u003c\/td\u003e\n\u003ctd\u003e91° Right-Hand Orientation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Carbide Insert Shape\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTNMG 1604__ (60° Triangular Shape)\u003c\/td\u003e\n\u003ctd\u003eTNMG 332__ \/ TNMG 333__ Family Matrix\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 (R) Boring Style\u003c\/td\u003e\n\u003ctd\u003eRight Hand (R) Boring Style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch3 class=\"cnc-h3\"\u003eISO Metric Boring Bar Model Designation Breakdown\u003c\/h3\u003e\n\u003cdiv class=\"cnc-nomenclature-flex\"\u003e\n\u003cdiv class=\"cnc-nomenclature-char\"\u003e\n\u003cstrong\u003eS\u003c\/strong\u003eShank Material Structural Type (Solid High-Tensile Carbon Steel Body Construction)\u003c\/div\u003e\n\u003cdiv class=\"cnc-nomenclature-char\"\u003e\n\u003cstrong\u003e25\u003c\/strong\u003eShank Scale Profile (25mm Outer Cylinder Diameter Match for Lathe Sleeves)\u003c\/div\u003e\n\u003cdiv class=\"cnc-nomenclature-char\"\u003e\n\u003cstrong\u003eS\u003c\/strong\u003eTotal Holder Length (250mm Standard Length Optimized Boring Shank Bar)\u003c\/div\u003e\n\u003cdiv class=\"cnc-nomenclature-char\"\u003e\n\u003cstrong\u003eD\u003c\/strong\u003eClamping System (Double Clamping: Top Finger Clamp + Internal Lock Pin)\u003c\/div\u003e\n\u003cdiv class=\"cnc-nomenclature-char\"\u003e\n\u003cstrong\u003eT\u003c\/strong\u003eInsert Geometry Profile (60° Equilateral Triangular Indexable Carbide Insert)\u003c\/div\u003e\n\u003cdiv class=\"cnc-nomenclature-char\"\u003e\n\u003cstrong\u003eF\u003c\/strong\u003eHolder Approach Angle (91 Degree Lead Path Configuration Engineered for Boring)\u003c\/div\u003e\n\u003cdiv class=\"cnc-nomenclature-char\"\u003e\n\u003cstrong\u003eN\u003c\/strong\u003eInsert Clearance Angle (0° Negative Rake High-Strength Internal Profile)\u003c\/div\u003e\n\u003cdiv class=\"cnc-nomenclature-char\"\u003e\n\u003cstrong\u003eR\u003c\/strong\u003eCutting Hand Direction (Right Hand Internal Feed moving toward the Chuck)\u003c\/div\u003e\n\u003cdiv class=\"cnc-nomenclature-char\"\u003e\n\u003cstrong\u003e16\u003c\/strong\u003eCutting Edge Length (Accommodates 16mm Nominal Edge Length TNMG Indexable Metric Profiles)\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3 class=\"cnc-h3\"\u003eRecommended Machining Parameters for Matching TNMG Inserts\u003c\/h3\u003e\n\u003cdiv class=\"cnc-table-wrapper\"\u003e\n\u003ctable class=\"cnc-data-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eTarget Workpiece Material Group\u003c\/th\u003e\n\u003cth\u003eCutting Speed (Vc) Range\u003c\/th\u003e\n\u003cth\u003eRecommended Feed Rate (fn) Range\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCarbon \/ Structural Steel Alloys (AISI 1045 \/ 4140)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e140 - 240 m\/min (460 - 785 SFM)\u003c\/td\u003e\n\u003ctd\u003e0.15 - 0.35 mm\/rev (0.006\" - 0.014\" ipr)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFerritic and Martensitic Stainless Steels (SUS 420 \/ 430)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e110 - 190 m\/min (360 - 625 SFM)\u003c\/td\u003e\n\u003ctd\u003e0.12 - 0.30 mm\/rev (0.005\" - 0.012\" ipr)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAustenitic Stainless Steel Series (SUS 304 \/ 316)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e90 - 160 m\/min (295 - 525 SFM)\u003c\/td\u003e\n\u003ctd\u003e0.10 - 0.25 mm\/rev (0.004\" - 0.010\" ipr)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cnc-link-box\"\u003e⛓️ Maximize Six-Edge Cutting Economy: \u003ca href=\"https:\/\/cnchome-beyond.com\/search?q=TNMG160404\" target=\"_blank\" rel=\"noopener\"\u003eClick Here to Browse High-Performance BEYOND TNMG 1604 \/ TNMG 332 Double-Sided Carbide Triangular Turning Inserts\u003c\/a\u003e Engineered with Advanced Chipbreakers.\u003c\/div\u003e\n\u003ch2 class=\"cnc-h2\"\u003e4. Core Industrial Application Scenarios\u003c\/h2\u003e\n\u003cp\u003eThe S25S-DTFNR16 internal boring tool bar is purpose-built for \u003cstrong\u003eHeavy Internal Diameter Roughing\u003c\/strong\u003e, \u003cstrong\u003ePrecision ID Profiling\u003c\/strong\u003e, and \u003cstrong\u003eDeep-Hole Blind Boring\u003c\/strong\u003e on automotive hubs, hydraulic cylinders, industrial piping couplers, and valve bodies. Operating on a 91° lead path, it excels at profiling parallel inner walls without leaving witness marks on steps, clearing away scale and rough drilling seams with ease. It is a vital tooling asset for production cells running conventional CNC lathe blocks or multi-tasking boring bars that require absolute tool rigidity during internal machining.\u003c\/p\u003e\n\u003ch2 class=\"cnc-h2\"\u003e5. Machine Turret \u0026amp; Ancillary Equipment Compatibility\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNC Lathe Tool Blocks and Sleeves:\u003c\/strong\u003e Mounts directly into 25mm round boring bar holders, split-bushing sleeves, or heavy-duty quick-change tool posts (QCTP 300\/400 series) setup for 1\" round bars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Profile Configuration:\u003c\/strong\u003e Precision pocket accommodates all standard double-sided negative 60° triangular inserts with 4.76mm (3\/16\") thickness and 16mm nominal edge size, including TNMG 160404, TNMG 160408, or TNMG 160412 variations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAncillary Spare Parts Compatibility:\u003c\/strong\u003e Employs fully standardized metric clamping hardware—including top finger wedge clamps, clamp lock screws, shim pins, and hex wrenches—enabling fast, secure insert indexing on the production line.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 class=\"cnc-h2\"\u003e6. BEYOND Internal Boring Bar Series Comparison Matrix\u003c\/h2\u003e\n\u003cdiv class=\"cnc-table-wrapper\"\u003e\n\u003ctable class=\"cnc-data-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eTool Holder Code\u003c\/th\u003e\n\u003cth\u003eClamping Format\u003c\/th\u003e\n\u003cth\u003eApproach Angle Profile\u003c\/th\u003e\n\u003cth\u003ePrimary Boring Application Style\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eS-DTFNR Series (Double Clamp)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTop Wedge + Pin Lock\u003c\/td\u003e\n\u003ctd\u003e91 Degrees Right Hand\u003c\/td\u003e\n\u003ctd\u003eInternal heavy rough boring. Top choice for stable roughing with 6-edge economy.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eS-SCLCR Series (Screw Lock)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCenter Screw Fastening\u003c\/td\u003e\n\u003ctd\u003e95 Degrees Right Hand\u003c\/td\u003e\n\u003ctd\u003eLight-to-medium internal finishing. Clear clearance path for smaller minimum bores.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eS-PTFNR Series (Top Pin Lock)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCenter Pin Clamping\u003c\/td\u003e\n\u003ctd\u003e91 Degrees Right Hand\u003c\/td\u003e\n\u003ctd\u003eMedium ID turning. Optimized for rapid tool changes and swift internal profile sweeps.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2 class=\"cnc-h2\"\u003e7. Why Choose BEYOND Professional Internal Boring Solutions\u003c\/h2\u003e\n\u003cp\u003eInternal boring generates severe directional deflection because the cutting force pushes the round shank outward from the bore centerline. On negative 60° triangular inserts, any pocket inaccuracy leads to micro-movement, accelerated nose wear, and high-frequency tool chatter. BEYOND guarantees strict pocket tolerances to align the insert's center height perfectly with your lathe spindle axis. Our rigid D-type double clamping structure anchors the insert securely against the carbide shim seat, dampening harmonics to deliver long, repeatable tool life and true cylindrical tolerances on every production batch.\u003c\/p\u003e\n\u003cdiv class=\"cnc-review-grid\"\u003e\n\u003cdiv class=\"cnc-review-card\"\u003e\n\u003cdiv class=\"cnc-stars\"\u003e★★★★★\u003c\/div\u003e\n\u003cstrong\u003e\"Flawless Clamping on Deep Bores\"\u003c\/strong\u003e\n\u003cp\u003eRunning this 25mm steel bar at an overhang of around 70mm in 4140 alloy steel. The double-clamping design holds the TNMG 332 insert incredibly firm. Chattering is non-existent, and our bore tolerances are spot on.\u003c\/p\u003e\n\u003cdiv class=\"cnc-review-meta\"\u003eMarcus D. | Ohio, USA\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cnc-review-card\"\u003e\n\u003cdiv class=\"cnc-stars\"\u003e★★★★★\u003c\/div\u003e\n\u003cstrong\u003e\"Hervorragende Vibrationsdämpfung\"\u003c\/strong\u003e\n\u003cp\u003eAbsolut verzugsfreier 25mm Stahlschaft. Die Doppelklemmen-Konstruktion zieht die TNMG-Platte bombenfest in den Plattensitz. Wir bohren damit zähe Edelstahlrohre auf und erzielen makellose Oberflächen.\u003c\/p\u003e\n\u003cdiv class=\"cnc-review-meta\"\u003eJürgen W. | Stuttgart, Germany\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cnc-review-card\"\u003e\n\u003cdiv class=\"cnc-stars\"\u003e★★★★★\u003c\/div\u003e\n\u003cstrong\u003e\"Rigidità eccellente nei fori ciechi\"\u003c\/strong\u003e\n\u003cp\u003eBareno destro da 25mm super robusto. Ottimo accoppiamento con inserti triangolari TNMG 160408. Il sistema a doppio bloccaggio impedisce qualsiasi torsione dell'inserto durante la sgrossatura pesante.\u003c\/p\u003e\n\u003cdiv class=\"cnc-review-meta\"\u003eStefano B. | Bologna, Italy\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cnc-review-card\"\u003e\n\u003cdiv class=\"cnc-stars\"\u003e★★★★★\u003c\/div\u003e\n\u003cstrong\u003e\"内径加工のビビリが激減\"\u003c\/strong\u003e\n\u003cp\u003eS25Sサイズを購入。Dタイプダブルクランプのおかげで、TNMG1604チップがガタつきなく強力に固定されます。中抜け加工や段付きボーリングでも刃先が逃げず、寸法精度が非常に安定しています。\u003c\/p\u003e\n\u003cdiv class=\"cnc-review-meta\"\u003eHiroshi K. | Nagoya, Japan\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cnc-review-card\"\u003e\n\u003cdiv class=\"cnc-stars\"\u003e★★★★☆\u003c\/div\u003e\n\u003cstrong\u003e\"Solid Heavy Industrial Boring Bar\"\u003c\/strong\u003e\n\u003cp\u003eVery accurate pocket machining. Standard TNMG inserts sit flawlessly with full contact on the carbide shim. The chip clearance behavior inside 40mm bores is excellent.\u003c\/p\u003e\n\u003cdiv class=\"cnc-review-meta\"\u003eThomas M. | Sheffield, UK\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2 class=\"cnc-h2\"\u003e8. Frequently Asked Questions (AI-Style Machinist Reference)\u003c\/h2\u003e\n\u003cdiv class=\"cnc-faq-item\"\u003e\n\u003cdiv class=\"cnc-faq-q\"\u003eQ1: What is the maximum recommended boring depth overhang for this S25S steel boring bar?\u003c\/div\u003e\n\u003cdiv class=\"cnc-faq-a\"\u003eA1: As a solid carbon steel boring bar, the standard industrial recommendation for the S25S-DTFNR16 is a maximum overhang ratio of up to 3 times the diameter (up to 75mm of free tool extension). For deep-hole operations exceeding 4x or 5x diameter, a solid carbide core boring bar or an anti-vibration damped bar should be used to eliminate structural chatter.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cnc-faq-item\"\u003e\n\u003cdiv class=\"cnc-faq-q\"\u003eQ2: Why choose a 91° approach angle for internal diameter boring cycles?\u003c\/div\u003e\n\u003cdiv class=\"cnc-faq-a\"\u003eA2: A 91° approach angle provides crucial clearance between the insert's secondary cutting edge and the newly machined internal bore wall. This prevents trailing-edge rubbing, reduces radial push-off forces, and allows the tool to face clean square shoulders at the bottom of blind holes.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cnc-faq-item\"\u003e\n\u003cdiv class=\"cnc-faq-q\"\u003eQ3: How do I handle chip nest build-up around the boring shank during deep blind-hole operations?\u003c\/div\u003e\n\u003cdiv class=\"cnc-faq-a\"\u003eA3: Long, tangled chips inside a bore can score the surface and damage the tool holder. To clear them, match this tool bar with a TNMG insert featuring an aggressive medium-to-roughing chipbreaker geometry. Increasing your feed rate or cutting speed will also help force the chip to deform and snap into small, self-breaking C-shapes that flush out easily.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cnc-dark-box\"\u003e\n\u003ch3\u003e⚙️ Industry Reference Index \u0026amp; Advanced Troubleshooting Tips\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eEquivalent Industry Cross-Reference:\u003c\/strong\u003e This premium 25mm round internal boring bar serves as a direct technical alternative to common standard industry codes, including: Sandvik S25S-DTFNR 16, Seco S25S-DTFNR16, Iscar S25S-DTFNR-16, and Kennametal S25S-DTFNR16 lathe tooling components.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTroubleshooting Workpiece Tapering and Tool Push-off:\u003c\/strong\u003e When internal boring reveals a slight dimension taper (where the hole narrows deeper inside the part), the cause is typically tool deflection from high radial force. To fix this without slowing production, reduce the nose radius of your TNMG insert (e.g., switch from a 0.8mm radius down to a 0.4mm radius) or decrease your depth of cut. Lowering the nose radius redirects the cutting force axially down the length of the rigid 25mm steel bar, minimizing outward deflection and ensuring a straight, uniform bore.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BEYOND","offers":[{"title":"Default Title","offer_id":43688500232364,"sku":"S25S-DTFNR16","price":39.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/7328\/1708\/files\/BEYOND_S25S-DTFNR16_internal_boring_bar_with_heavy_duty_D-type_double_clamp_system.jpg?v=1782874871","url":"https:\/\/cnchome-beyond.com\/products\/beyond-s25s-dtfnr16-internal-turning-tool-holder","provider":"CNCHome-Beyond","version":"1.0","type":"link"}