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Dia Edge Mitsubishi CNMG120408-GK
Engineered for precision and performance, the Dia Edge Mitsubishi CNMG120408-GK inserts are high-quality, double-sided turning inserts ideal for roughing to medium finishing applications. These inserts are specifically designed for steel machining, including low to medium carbon steels, alloy steels, and mild structural steels.

The GK chipbreaker geometry offers excellent control of medium to long chips, reducing built-up edge and promoting stable cutting at a wide range of speeds and feeds. Whether you’re operating under dry or wet conditions, these inserts deliver consistent surface finishes with excellent edge wear resistance.

Key Features:
- Insert Style: CNMG120408 – 80° diamond, double-sided with 4 cutting edges
- Chipbreaker: GK – optimized for general-purpose turning of steel
- Material Compatibility: Best suited for steel; can also perform well on cast steel and certain stainless steels
- Applications: Roughing to semi-finishing
- Finish: Delivers a clean, smooth surface with predictable chip evacuation
- Coating: High-performance PVD/CVD coating (depending on grade) for extended tool life
Ideal for CNC lathes or manual turning machines, these inserts strike the perfect balance between durability, chip control, and surface quality — making them a reliable choice for production environments and job shops alike.
Sumitomo WNMG080408N-UP
Precision-crafted by Sumitomo, the WNMG080408N-UP inserts are premium-grade, double-sided turning inserts designed for high-efficiency machining of steel and stainless steel. Featuring a negative 80° trigon (triangular) shape with six usable cutting edges, these inserts offer excellent cost-per-edge value for medium to finishing applications.

The UP chipbreaker geometry provides smooth cutting action with low cutting forces, making it ideal for operations that demand a superior surface finish and reliable chip evacuation — even on tougher materials or interrupted cuts.

Key Features:
- Insert Style: WNMG080408 – 80° trigon, double-sided, 6 cutting edges
- Chipbreaker: UP – optimized for finishing to medium turning
- Material Compatibility: Designed primarily for stainless steel and steel (including alloy and carbon steels)
- Applications: Light to medium cuts, finishing operations
- Finish Quality: Excellent surface finish with minimal vibration or chatter
- Grade Options: Typically offered in high-performance CVD/PVD-coated grades for long tool life and heat resistance
These inserts are ideal for use on CNC lathes and turning centers in industries requiring tight tolerances, clean finishes, and consistent chip control — such as automotive, energy, and general engineering sectors.
Tungaloy WNMG080408 T505
Built for performance and longevity, the Tungaloy WNMG080408 T505 inserts are high-efficiency negative-style turning inserts designed for cast iron machining. With their classic 80° trigon shape and six cutting edges, they offer excellent edge economy and consistent results in medium to roughing operations.

The T505 grade features a durable CVD coating over a tough substrate, specifically developed for high-speed turning of gray and ductile cast iron. Its superior wear resistance and thermal stability make it a go-to choice for demanding cast iron applications where productivity and surface integrity are key.

Key Features:
- Insert Style: WNMG080408 – 80° trigon, double-sided, 6 cutting edges
- Grade: T505 – CVD-coated for excellent performance on cast iron
- Material Compatibility: Optimized for gray cast iron (GG) and ductile iron (GGG)
- Applications: Medium to heavy turning, roughing
- Chip Control: Designed to manage abrasive cast iron chips and minimize tool wear
- Finish: Reliable dimensional accuracy with a good machined surface in cast iron
Ideal for use in high-volume production or tough cast iron jobs, these inserts are trusted by professionals in the automotive, heavy machinery, and foundry industries.
Square 5c Collet Block 12mm

This Square 5C Collet Block is designed for securely holding workpieces in milling, drilling, or grinding operations, featuring a 5C collet system for precise clamping. The block accepts a 12 mm 5C collet (included), suitable for holding round stock or tools with a 12 mm shank diameter. Constructed from hardened steel, the square block ensures stability and accuracy during machining, with four sides for versatile positioning in a vise or fixture. The block includes a threaded closing nut and a lever for quick collet tightening and release. This used unit shows minor surface wear, including light scratches, but remains fully functional. Ideal for machinists needing a reliable workholding solution. No additional accessories are included.
MT4 Face Mill

This MT4 Face Mill is a milling cutter with an 80 mm diameter, designed for face milling operations on milling machines. It features a Morse Taper No. 4 (MT4) shank for secure mounting on compatible spindles, commonly used in manual or CNC milling setups. The cutter has four insert pockets, each holding a square carbide insert (inserts included)
NOS Speedcut MT 3-4 Drill Bits
Explore the reliability and craftsmanship of NOS Speedcut drill bits, offered in both Morse Taper 3 (MT3) and Morse Taper 4 (MT4) shanks. Carefully preserved in their original plastic or wax paper, these drill bits are in excellent condition and ready to deliver exceptional performance.

Chip Breaker Design on Large HSS Drill Bits

A chip breaker design is a specialized feature on large High-Speed Steel (HSS) drill bits that enhances drilling efficiency and performance. This design includes strategically placed grooves or notches along the cutting edge, which work to:
1. Break Long Chips into Smaller Pieces: Prevents the formation of long, continuous metal chips that can clog the drill bit or workpiece.
2. Improve Heat Dissipation: Reduces friction and heat buildup by allowing smaller chips to evacuate quickly, ensuring longer tool life.
3. Enhance Cutting Efficiency: Maintains consistent contact with the material, reducing cutting forces and making the drilling process smoother.
4. Boost Safety and Precision: Minimizes the risk of chip jamming, which can lead to uneven cuts or tool damage.
Chip breaker designs are particularly useful for drilling tougher materials, such as stainless steel, and are a valuable feature for achieving clean, precise results on larger-scale projects.

Why Choose Speedcut?

Speedcut drill bits are engineered for accuracy and long-lasting durability, making them perfect for demanding drilling tasks in industrial or professional settings. Their NOS condition ensures like-new performance for your projects.

Browse our extensive range of other top-quality drill bits and sizes here.
NOS Frost MT4 Drill Bits

Discover genuine NOS Frost drill bits, proudly made in Australia over 30 years ago. These vintage, high-quality drill bits are a testament to Frost’s craftsmanship, offering reliable precision and durability. Most are still sealed in their original plastic or wax paper, ensuring they’re in pristine condition and ready for your toughest projects.

All are MT4 shank

Browse our wide selection of other premium brands and sizes here.
Sutton MT3 Taper Drill Bits
Discover these high-quality Sutton drill bits, New Old Stock (NOS), with a Morse Taper 3 (MT3) shank. Most are still sealed in their original plastic or wax paper and in flawless condition. Perfect for precision drilling and long-lasting performance.

Browse our wide selection of other premium brands and sizes here.
- 1 – 1/16″ (26.98mm)
- 1 7/64″ (28.17mm)
Why Sutton Drill Bits?

Sutton is synonymous with premium-quality tooling, offering exceptional performance and longevity. These NOS drill bits are perfect for professional machinists, contractors, and enthusiasts.

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Key Features:

Key Features:

Key Features:

Chip Breaker Design on Large HSS Drill Bits

Why Choose Speedcut?

Why Sutton Drill Bits?