TaeguTec VCMT160408-PC TT8125 Carbide Turning Insert | 10 Pcs/Box
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TaeguTec VCMT160408-PC TT8125 Inserts
First-Choice General Steel & Cast Iron Profiling | TT8125 Multi-Layer CVD Grade | Box of 10 Pcs
"Which 35-degree positive diamond carbide insert with a 0.8mm corner radius and PC chipbreaker is the most reliable all-around choice for medium-to-high speed finishing and internal boring in carbon steels, alloy steels, and cast irons?"
The TaeguTec VCMT160408-PC TT8125 is a single-sided, positive-rake 35° rhombic turning insert engineered as the primary workhorse for general-purpose steel finishing, copy profiling, and internal bore machining across carbon steels, alloy steels, and gray/ductile cast irons. Powered by TaeguTec's flagship TT8125 CVD coating grade, this insert combines a tough, gradient-sintered carbide substrate with a thick, ultra-smooth multi-layer TiCN + Al₂O₃ Chemical Vapor Deposition (CVD) thermal barrier coating. Unlike ultra-hard P05 grades that can micro-chip when encountering slight scale or intermittent cuts, TT8125 balances high-temperature crater resistance with superior edge toughness—making it the go-to grade for medium-to-high cutting speeds (ISO P15-P30). Paired with the sharp, positive-rake PC finishing-to-medium chipbreaker and a durable 0.8mm corner radius, it minimizes radial cutting forces to prevent chatter in slender shafts and internal boring bars while curling chips cleanly. Whether you are boring internal diameters with Beyond S16Q-SVXCR16 Boring Bar Holder or browsing our broader selections of TaeguTec VCMT inserts, TaeguTec VBMT inserts, and TaeguTec VNMG inserts, the VCMT160408-PC TT8125 ensures consistent, predictable production output. Explore further design insights in our resources on carbide insert nose radius and insert grade speeds and feeds.
Core Engineering Advantages
TT8125 Balanced CVD Shield
Thick multi-layer TiCN + Al₂O₃ CVD coating over a tough gradient substrate combines thermal crater resistance with reliable edge security.
PC Finishing Chipbreaker
Positive-rake geometry curls finishing chips smoothly and maintains low radial cutting forces across light-to-medium depths.
35° Positive Profiling Access
Slender rhombic shape and 0.8mm nose radius provide excellent clearance in tight internal profiles and complex internal bores.
ISO Code Specification Breakdown
Technical Specifications & Dimensional Comparison
| Parameter | Metric (Standard) | Imperial Equivalent |
|---|---|---|
| ISO / ANSI Designation | VCMT 160408-PC | VCMT 332-PC |
| Inscribed Circle (IC) | 9.525 mm | 0.375" (3/8") |
| Thickness (S) | 4.76 mm | 0.1875" (3/16") |
| Corner Radius (RE) | 0.80 mm | 0.0315" (approx. 1/32") |
| Grade & Coating | TT8125 (Multi-Layer CVD TiCN + Al₂O₃) | General Steel & Cast Iron CVD Carbide |
Recommended Cutting Parameters
*Values are starting recommendations for medium-to-high speed finishing and internal boring in carbon steels, alloy steels, and cast irons.
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (Ap) |
|---|---|---|---|
| Carbon Steel (1045 / S45C) | 180 - 320 m/min | 0.10 - 0.30 mm/rev | 0.40 - 2.50 mm |
| Alloy & Tool Steel (4140 / 4340) | 160 - 280 m/min | 0.10 - 0.28 mm/rev | 0.40 - 2.20 mm |
| Gray & Ductile Cast Iron (FC250 / FCD450) | 170 - 300 m/min | 0.12 - 0.32 mm/rev | 0.50 - 2.50 mm |
Compatible Tool Holders & Boring Bar Resources
Pair these positive inserts with compatible 16-size (3/8" IC) positive turning and boring toolholders such as the Beyond S16Q-SVXCR16 Boring Bar Holder, Beyond S16Q-SVQCL11 Boring Bar Holder, and Beyond C16Q-SVJCR11 Tungsten Steel Boring Bar.
For internal profiling solutions, explore our rough and fine boring series or browse screw-on system boring bars.
Industrial Applications
- General Steel & Cast Iron Internal Boring: Delivering reliable tool life and smooth surface finishes in continuous and lightly interrupted bore profiling.
- Slender Shaft & Contour Profiling: 7° positive clearance and sharp PC edge geometry minimize radial cutting forces to prevent deflection on delicate steel components.
- Multi-Brand Tooling Consolidation: Fully compatible with alternate positive turning systems across Korloy VCMT, Korloy VCGT/VCMT, and ZCC-CT VCMT catalogs.
System Compatibility & Related Insert Catalogs
The VCMT 160408-PC (ANSI VCMT 332-PC) fits all standard ISO-compliant positive 35° rhombic boring bars and turning toolholders. To expand your tooling inventory, explore our comprehensive selections including TaeguTec VCMT, TaeguTec VBMT, and TaeguTec negative turning inserts. Review additional application guides such as CNMG grade cross reference guide, chipbreaker family guide, inserts by material, inserts by operation, and top global CNC insert brands.
TaeguTec Grade Selection Matrix
Selecting the optimal TaeguTec turning grade for positive inserts:
- TT8125 (Featured - First-Choice Steel & Cast Iron CVD Grade): Thick multi-layer TiCN + Al₂O₃ CVD coating over a tough gradient substrate—ideal for general-purpose steel (ISO P15-P30) and cast iron (ISO K) finishing.
- TT8115 (CVD): Harder, higher-speed CVD coated grade recommended for continuous high-speed finishing of steels (ISO P05-P20) when maximum crater resistance is desired.
- TT9225 (PVD): High-density nano-PVD TiAlN grade designed for stainless steels (ISO M) and sticky alloys where sharper edge geometry is required.
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On-staff tooling specialists available for speed and feed recommendations.
Frequently Asked Questions
Q: How does TT8125 compare to TT8115?
A: Both are multi-layer CVD grades for steel and cast iron, but TT8125 offers higher substrate toughness for general-purpose steel turning and light interruptions, whereas TT8115 prioritizes maximum wear resistance at higher continuous speeds.
Q: When should I choose a positive VCMT insert over a negative VNMG insert?
A: Choose positive VCMT inserts when performing internal boring or machining slender, vibration-sensitive parts where lower cutting forces and 7° clearance angles are required to prevent chatter.
Q: How many cutting edges are included in each box?
A: Each single-sided VCMT insert provides 1 precision indexable cutting edge (10 edges total per factory-sealed box).
Need Help With TaeguTec Inserts?
Looking for a TaeguTec 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 TaeguTec 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.