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AYSNAGLSDHSS-CO Long Drill GLSDSold0pcsHSS-CO Long Drill GLSD (6550P), a cobalt HSS straight shank long drill that passes through thick plates and deep holes in one shot, eliminating re-chucking. Diameter 1~13mm, overall length 100~300mm, 9~40xD, available in 173 sizes. G coating boosts wear resistance and tool life. Drills carbon steel, alloy steel and stainless steel up to HRC40 - a strong deep-hole performer. Japanese brand, consistent quality.
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$ 470 ~ $ 5,700
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HSS-CO Long Drill GLSD
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【Product Name】The NACHI G-Coated Cobalt HSS Long Drill (Model: 6550P) is a high-performance tool engineered for ultra-deep hole applications. It effectively addresses chip packing, thermal drift, and the risk of tool breakage inherent in extended-reach drilling.

【Key Features & Benefits】

  • HSS-CO Substrate with G Coating: Crafted from Cobalt High-Speed Steel (HSS-CO) for superior thermal stability. The G (TiN) coating reduces friction and prevents material welding, a critical requirement for ISO M materials (Stainless Steel) up to HRC40.

  • 38° High Helix Geometry: The aggressive 34 to 38-degree helix ensures maximum chip uplift. In ultra-deep holes, it forces chips out efficiently, preventing the accumulation that leads to catastrophic tool failure.

  • 125° Point Angle & Enhanced Core: The 125-degree point angle improves centering performance, while the reinforced core structure provides the torsional rigidity needed for deep penetration without deviation.

  • Optimized for Ultra-Deep Reach: Specifically designed for hole depths far exceeding standard drills, maintaining dimensional accuracy and hole straightness.

【Applications & Usage】

  • Primary Applications: Ideal for ultra-deep hole drilling, mold cooling channels, and long internal fluid circuits.

  • Recommended Materials:

    • ISO M (Stainless Steel): Tackles work-hardening and chip evacuation in tough alloys.

    • ISO P (Carbon/Alloy Steel): Delivers stable performance and long tool life for steels under HRC30.