Korloy MGMN250-G NC3030 2.5mm Double-Ended Tough Grooving Insert for Steel (10pcs)
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The Original Korloy MGMN250-G NC3030 is a specialized 2.5mm Double-Ended Grooving Insert engineered for Impact Resistance and Stability. This 2.5mm intermediate width provides significantly better lateral rigidity than 2.0mm versions, making it ideal for deeper grooves where tool deflection must be minimized. Paired with the NC3030 CVD grade, it is the ultimate "safety-first" tool for machining Carbon and Alloy Steels in unstable conditions or during heavy interrupted cutting.
Built for Toughness: NC3030 is Korloy's most durable CVD grade for steel. If you are grooving through forgings, hex bars, or parts with pre-drilled holes, this insert provides the necessary edge strength to prevent catastrophic chipping.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | MGMN250-G |
| Insert Width (w) | 2.5 mm |
| Grade | NC3030 (Ultra-Tough CVD Coating) |
| Chipbreaker | -G (Reinforced Edge for General Use) |
Core Performance Benefits:
- Maximum Edge Reliability: The specialized substrate resists crack propagation, protecting the 2.5mm tip from breakage during sudden impacts.
- High Shock Resistance: Optimized for non-continuous cutting, such as machining splines, keyways, or hexagonal bars.
- Double-Ended Economy: Features two usable cutting edges, offering excellent cost-per-part value for roughing and parting-off.
- Optimized 2.5mm Kerf: Provides a perfect balance between tool rigidity and material savings compared to 3.0mm inserts.
Recommended Cutting Parameters:
| Operation Type | Cutting Speed (Vc) | Feed Rate (f) |
|---|---|---|
| Steel (Continuous) | 110 - 190 m/min | 0.05 - 0.16 mm/rev |
| Steel (Interrupted) | 80 - 140 m/min | 0.05 - 0.12 mm/rev |
| Rough Forgings | 70 - 130 m/min | 0.06 - 0.14 mm/rev |
Compatible Tool Holders:
Ensure your holder blade width matches the 2.5mm insert exactly for proper clamping:
- External Holders: MGEHR 1616-2.5 / 2020-2.5 / 2525-2.5
Steel Machining Logic: NC3030 vs. NC3020
At the 2.5mm width, selecting based on machine stability is vital:
The Toughness Specialist. First choice for interrupted cuts and unstable setups. Use this if your current inserts are snapping or chipping prematurely.
The Wear Specialist. Best for high-speed, continuous cutting on stable machines. Offers longer tool life when the cut is smooth and consistent.
Machinist's Pro Tip: For the MGMN250-G, the 2.5mm width requires precise alignment. Always ensure the center height is exact to maximize the toughness benefits of the NC3030 grade, especially when parting-off to the center of a bar.
Packaging: 10 pieces per box.
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