TaeguTec VBMT160408-MT TT8115 CVD Coated Carbide Turning Insert | 10 Pcs/Box
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TaeguTec VBMT160408-MT TT8115 Inserts
High-Speed Medium Turning in Steel & Cast Iron | TT8115 CVD Coated Grade | Box of 10 Pcs
"Which 35-degree positive diamond CVD-coated carbide insert with a 0.8mm corner radius and MT chipbreaker is best for high-speed medium turning and continuous semi-finishing in carbon steels, alloy steels, and cast irons?"
The TaeguTec VBMT160408-MT TT8115 is a high-velocity, single-sided, positive-rake 35° rhombic turning insert engineered specifically for high-speed medium-duty machining, semi-finishing, and continuous contour turning across carbon steels, alloy steels, and gray/ductile cast irons. Powered by TaeguTec's premier high-speed TT8115 multi-layer CVD coated carbide grade, this insert combines a high-hardness, deformation-resistant carbide substrate with an ultra-thick, smooth alumina (Al2O3) and TiCN chemical vapor deposition (CVD) coating designed to endure extreme cutting temperatures and rapid surface speeds. Compared to general-purpose CVD grades like TT8125 or tougher PVD grades like TT9225, TT8115 maximizes flank wear and crater wear resistance during continuous high-RPM operations. Paired with the robust MT medium machining chipbreaker designed with a strong 3D geometry for moderate to heavy feeds and depths of cut, it delivers stable chip curling and exceptional tool life. Whether you are pairing it with internal boring bars like the Beyond S25S-SVJBR16 Internal Boring Bar, Beyond S16Q-SVXBR11 Boring Bar Holder, or Beyond C16Q-SVJBR11 Tungsten Steel Boring Bar, or browsing our extensive collections of TaeguTec VBMT inserts, TaeguTec VCMT inserts, TaeguTec VNMG inserts, Korloy VBMT inserts, ZCC-CT VBMT inserts, and Tungaloy positive turning inserts, the VBMT160408-MT TT8115 guarantees elite shop floor productivity. Review additional engineering insights in our resources on carbide insert nose radius, machining speeds and feeds, what is a carbide drill, and solid vs indexable milling.
Core Engineering Advantages
TT8115 High-Speed CVD Grade
Ultra-hard substrate paired with thick alumina CVD coating maximizes wear resistance and thermal stability at high cutting speeds.
MT Medium Machining Chipbreaker
Robust geometry engineered for stable chip control during medium turning and semi-roughing passes across carbon steels and cast irons.
35° Positive Rhombic Geometry
Acute 35-degree nose angle and positive clearance provide excellent accessibility for internal boring and complex contour turning.
ISO Code Specification Breakdown
Technical Specifications & Dimensional Comparison
| Parameter | Metric (Standard) | Imperial Equivalent |
|---|---|---|
| ISO / ANSI Designation | VBMT 160408-MT | VBMT 332-MT (Approx.) |
| 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 & Substrate | TT8115 (High-Speed Multi-Layer CVD Coated Carbide) | High-Speed Steel/Cast Iron CVD Carbide |
Recommended Cutting Parameters
*Values are starting recommendations for high-speed medium turning and semi-roughing passes in carbon steels, alloy steels, and cast irons with TT8115 CVD grade.
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (Ap) |
|---|---|---|---|
| Carbon & Low Alloy Steels (P - 1045 / 4140) | 260 - 440 m/min | 0.18 - 0.45 mm/rev | 1.00 - 4.00 mm |
| Free Cutting Steels & Structural Steels | 280 - 480 m/min | 0.20 - 0.48 mm/rev | 1.00 - 4.50 mm |
| Gray & Ductile Cast Irons (K - GG25 / GGG50) | 220 - 380 m/min | 0.16 - 0.42 mm/rev | 0.80 - 3.50 mm |
Compatible Tool Holders & Boring Bar Resources
Pair these precision 16-size (3/8" IC) positive inserts with compatible turning and boring toolholders such as the Beyond S25S-SVJBR16 Internal Boring Bar, Beyond S16Q-SVXBR11 Boring Bar Holder, and Beyond C16Q-SVJBR11 Tungsten Steel Boring Bar.
For internal profiling solutions, explore our rough and fine boring series or browse screw-on system boring bars.
Industrial Applications
- High-Speed Medium Steel Turning: High-efficiency continuous medium turning and semi-roughing passes on carbon steel shafts, forged automotive components, and machinery parts.
- Continuous Cast Iron & Steel Contouring: High-hardness TT8115 CVD grade resists abrasive flank wear and plastic deformation during rapid high-RPM production runs.
- Multi-Brand Tooling Consolidation: Fully compatible with alternate positive turning systems across TaeguTec VBMT, Korloy VBMT, ZCC-CT VBMT, and Tungaloy positive turning inserts catalogs.
System Compatibility & Related Insert Catalogs
The VBMT 160408-MT fits all standard ISO-compliant positive 35° rhombic toolholders and boring bars designed for 9.525mm (3/8") IC positive VBMT inserts. To expand your tooling inventory, explore our comprehensive selections including TaeguTec VCMT, TaeguTec VNMG, 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:
- TT8115 (Featured - High-Speed CVD Coated Grade): Ultra-wear-resistant multi-layer CVD coated carbide grade engineered for high-speed continuous turning in carbon steels, alloy steels (ISO P), and cast irons (ISO K).
- TT8125 (General CVD Coated Grade): Tougher multi-layer CVD grade designed as the first choice for general steel turning where moderate interruptions or varying depths of cut occur.
- TT9225 (PVD Coated Grade): Nano-PVD coated grade engineered for stainless steel machining (ISO M) and alloy steels where sharp edge toughness and thermal shock resistance are vital.
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Technical Engineering Support
On-staff tooling specialists available for speed and feed recommendations.
Frequently Asked Questions
Q: How does CVD grade TT8115 compare to TT8125 and PVD grade TT9225?
A: TT8115 is TaeguTec's highest-speed, most wear-resistant CVD grade for continuous steel and cast iron turning. TT8125 offers slightly higher toughness for general CVD steel turning, while PVD grade TT9225 is optimized for stainless steels and interrupted cuts.
Q: What is the difference between MT and FG chipbreakers?
A: The MT chipbreaker features a reinforced geometry engineered for medium turning and heavier depths of cut in steel and cast iron, whereas the FG chipbreaker is tailored for fine finishing and shallow depths of cut.
Q: How many cutting edges are included in each box?
A: Each single-sided VBMT 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.