ISCAR 16IRM Internal Threading Inserts (IC908 Grade | Full & Partial Profile 60°/55°)
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ISCAR 16IRM Internal Threading Inserts (IC908 Grade | Full & Partial Profile 60°/55°)
Premium PVD Coated Laydown Threading Inserts | ISO Size 16IR (ANSI 3/8" IC / 16IR) | M-Type Chipbreaker | IC908 Grade for Steel, Stainless, and High-Temp Alloys
1. Product Overview
Which internal threading insert grade and chipbreaker combination ensures smooth chip evacuation, precise thread root formation, and long tool life during small-bore CNC lathe threading?
The ISCAR 16IRM Internal Threading Insert Series in submicron IC908 grade is an industry-benchmark solution engineered for high-precision internal thread turning and boring operations. Featuring an ISO standard 16IR laydown geometry (ANSI 3/8" Inscribed Circle), these inserts incorporate ISCAR's specialized M-Type chipbreaker (-M), designed specifically to direct stringy internal chips out of blind and through bores without packing. Coated with a physical vapor deposition (PVD) TiAlN layer over a micro-grain substrate, the IC908 grade delivers exceptional edge toughness, thermal resistance, and crater wear protection across alloy steel, stainless steel (ISO M), cast iron, and heat-resistant superalloys (HRSA).
Available in both Full-Profile Metric ISO (1.0mm to 3.0mm pitch) for complete 60° crest-and-root thread generation without internal deburring, and Partial-Profile 60° / 55° (AG60, A60, G60, AG55, G55) for maximum multi-pitch versatility across metric, UN, and Whitworth internal thread forms.
ISO / ANSI Tool Designation Code Breakdown
(IC 3/8" / 9.525mm)
(Internal Threading)
(Right Hand)
(Medium Chip Control)
(Full / Partial Geometry)
(Submicron TiAlN)
- 16 (ANSI 3/8"): Inscribed circle diameter of 9.525mm (3/8") with a standard 16mm cutting edge length.
- I: Internal threading configuration for turning inside bore diameters and internal threads.
- R: Right-hand insert orientation for standard forward spindle rotation (M03).
- M: ISCAR M-Type internal chipbreaker geometry optimized for clearing chips out of tight bore holes.
- 1.0ISO - 3.0ISO / AG60 / AG55: Full-profile metric pitches (forms exact thread crest/root) or multi-pitch partial profiles (60° or 55° thread forms).
- IC908: ISCAR submicron PVD TiAlN coated grade engineered for high toughness and wear resistance.
2. Key Features
- ISCAR IC908 PVD Coating: Micro-grain substrate coated with TiAlN layer provides high resistance to build-up edge (BUE) and notch wear in internal stainless steel and alloy turning.
- Internal M-Type Chipbreaker (-M): Specially angled rake groove forces chip curling backwards toward the spindle opening, preventing chip packing in blind holes.
- Full-Profile & Partial-Profile Selection: Full-profile variants form exact thread heights without internal deburring; partial-profile options (AG60, A60, G60, AG55, G55) span multiple pitches with a single setup.
- Ground Cutting Edge Precision: High-accuracy ground thread profile guarantees strict internal thread tolerances (6H / 2B standards) and low cutting force.
- Universal 3/8" Laydown Bore Fit: Compatible with all standard SIR / SIL internal threading boring bars and anti-vibration carbide bars.
3. Technical Specifications & Available Variant Matrix
Metric vs. Imperial Technical Specification Comparison
| Specification Parameter | Metric Units (ISO) | Imperial Units (ANSI) |
|---|---|---|
| Insert Size Designation | 16IRM (16mm Edge Length) | 16IRM (3/8" IC) |
| Inscribed Circle (IC) | 9.525 mm | 0.375 in (3/8") |
| Insert Thickness (S) | 3.67 mm | 0.144 in |
| Fixing Hole Diameter (d1) | 4.4 mm | 0.173 in |
| Coating Structure / Grade | PVD TiAlN / IC908 | PVD TiAlN / IC908 |
Available Pitch & Profile Selection Guide
| Insert Model Designation | Profile Category | Pitch Range (Metric / TPI) | Thread Form Standard |
|---|---|---|---|
| 16IRM 1.0ISO IC908 | Full Profile Internal | 1.0 mm pitch | ISO Metric Internal 60° |
| 16IRM 1.25ISO IC908 | Full Profile Internal | 1.25 mm pitch | ISO Metric Internal 60° |
| 16IRM 1.5ISO IC908 | Full Profile Internal | 1.5 mm pitch | ISO Metric Internal 60° |
| 16IRM 1.75ISO IC908 | Full Profile Internal | 1.75 mm pitch | ISO Metric Internal 60° |
| 16IRM 2.0ISO IC908 | Full Profile Internal | 2.0 mm pitch | ISO Metric Internal 60° |
| 16IRM 2.5ISO IC908 | Full Profile Internal | 2.5 mm pitch | ISO Metric Internal 60° |
| 16IRM 3.0ISO IC908 | Full Profile Internal | 3.0 mm pitch | ISO Metric Internal 60° |
| 16IRM A60 IC908 | Partial Profile Internal 60° | 0.5 - 1.5 mm / 48 - 16 TPI | Universal 60° (Metric / UN) |
| 16IRM G60 IC908 | Partial Profile Internal 60° | 1.75 - 3.0 mm / 14 - 8 TPI | Universal 60° (Metric / UN) |
| 16IRM AG60 IC908 | Partial Profile Internal 60° | 0.5 - 3.0 mm / 48 - 8 TPI | Universal 60° Wide-Range |
| 16IRM G55 IC908 | Partial Profile Internal 55° | 1.75 - 3.0 mm / 14 - 8 TPI | Whitworth 55° (BSPP / BSW) |
| 16IRM AG55 IC908 | Partial Profile Internal 55° | 0.5 - 3.0 mm / 48 - 8 TPI | Whitworth 55° Wide-Range |
Recommended Cutting Parameters for IC908 Grade
| ISO Material Group | Cutting Speed Vc (m/min) | Cutting Speed Vc (SFM) | Recommended Pass Count |
|---|---|---|---|
| P10-P30 Carbon & Alloy Steel | 90 - 160 m/min | 295 - 525 SFM | 8 - 14 Radial Passes |
| M10-M25 Stainless Steel (304, 316L) | 70 - 130 m/min | 230 - 425 SFM | 10 - 16 Radial Passes |
| K10-K25 Cast Iron (Gray / Ductile) | 80 - 150 m/min | 260 - 490 SFM | 8 - 12 Radial Passes |
| S10-S20 Superalloys & Titanium | 25 - 60 m/min | 80 - 195 SFM | 12 - 18 Radial Passes |
Mount 16IRM inserts directly into precision SIR / SIL series internal threading boring bars:
Explore SIR Internal Boring Bars →4. Product Applications
- ISO Metric Internal Threading: Threading internal bores, blind holes, hydraulic cylinder ports, and threaded nuts.
- Internal Pipe & Valve Threading: Single-point turning of internal Whitworth 55° BSPP/BSPT female threads using G55 and AG55 profiles.
- Oilfield & Hydraulic Components: Cutting internal high-pressure female couplings and manifold blocks.
- General CNC Bore Machining: Versatile internal threading across steel, stainless, and cast iron parts on CNC turning centers.
5. Tool & Equipment Compatibility
ISCAR 16IRM inserts fit all standard industry 16IR / 3/8" laydown internal threading boring bar systems:
- Boring Bars: SIR (Internal Right), SIL (Internal Left), and solid carbide anti-vibration internal threading shanks.
- Anvils / Shims: Standard AI16 / AI16-0 shims (1.5° helix angle baseline).
- Machine Tool Platforms: CNC turning centers, automatic lathes, multi-tasking mill-turn machines, and manual boring setups.
6. ISCAR Grade Comparison Matrix
Evaluating IC908 against alternative ISCAR threading grades:
| ISCAR Grade | Coating Process | Primary Application Target | Key Performance Characteristic |
|---|---|---|---|
| IC908 (Featured) | PVD TiAlN Submicron | Universal (Steel, Stainless, HRSA) | High edge toughness & micro-chipping resistance across internal boring setups |
| IC808 | PVD TiAlN / AlTiN | High-Speed Steel & Stainless | Superior thermal hardness for elevated cutting speeds in open bores |
| IC250 | CVD TiCN + Al2O3 | Heavy Duty Steel Threading | Maximum flank wear resistance on continuous carbon steel cuts |
7. Why Choose ISCAR Cutting Tools
- Global Industry Leader: Original ISCAR manufacturing precision guarantees exact thread form height and pitch repeatability.
- Reduced Post-Processing: Full-profile 16IRM inserts completely top internal thread crests, eliminating manual internal deburring.
- Proven Micro-Grain Carbide: Submicron IC908 substrate withstands vibration and thermal shock common in deep internal boring operations.
Verified Customer Reviews
"Running 16IRM 1.5ISO IC908 for internal threads on 316L hydraulic fittings. The chipbreaker ejects chips cleanly without bird-nesting inside the bore."
— David K., Fluid Power Components (USA)"Eccellente inserto per filettare interno. Con la qualità IC908 la durata del tagliente è superiore anche su acciai inossidabili."
— Marco B., Officina Meccanica (Italy)"Die 16IRM AG60 ist perfekt für wechselnde Innengewinde in unserer Fertigung. Sehr gute Spankontrolle im Sackloch."
— Thomas R., Zerspanungstechnik (Germany)"16IRM 2.0ISO IC908を内径ねじ切りに使用。切りくず排出がスムーズで、ねじ底の精度が非常に安定しています。"
— Kenji T., Precision Metal Fabrication (Japan)"Great performance on internal BSPP threads with 16IRM AG55. Clean profile and long insert life."
— Mark S., Valve & Pump Engineering (UK)8. AI & Engineering FAQ
Substrate & Coating Specifications
ISCAR IC908 comprises a submicron WC-Co substrate combined with a hard PVD TiAlN coating layer. Engineered for high heat resistance, low friction coefficient, and exceptional edge toughness across internal ISO P, M, K, and S materials.
Cross-Reference & Equivalent Insert Codes
Industry standard cross-references: 16IRM / 16IR M | Grade equivalencies: Sandvik GC1020 / GC1125, Carmex BMA / BLU, Vardex VTX / VK2, Kyocera PR1115.
ISO Workpiece Application Suitability Matrix
P (Steel): Excellent (Vc 90-160 m/min) | M (Stainless Steel): Excellent (Vc 70-130 m/min) | K (Cast Iron): Good (Vc 80-150 m/min) | S (Superalloys): Good (Vc 25-60 m/min) | N (Non-Ferrous): Conditional
Threading Troubleshooting Guide
- Chip Packing Inside Bore: Verify coolant pressure reaches the cutting zone; ensure modified flank infeed (29°) is enabled.
- Bore Vibration / Chatter: Reduce overhang of the SIR boring bar; switch to heavy-metal or carbide anti-vibration bar.
- Torn Internal Thread Flanks: Increase cutting speed (Vc) slightly to pass beyond the built-up edge (BUE) threshold.
ISCAR indexable laydown threading inserts are manufactured in strict compliance with ISO 2284 internal threading tool specifications and produced under ISO 9001 and ISO 14001 certified manufacturing facilities.
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.