Solid Carbide Drill Bit 5D with Internal Coolant, 3-15mm Straight Shank CNC Twist Drill for Stainless Steel Metal Drilling (5D Internal Cooling, D6.9x53xd8x91)

The 5D straight-shank internal-cooling solid carbide drill bit is a high-performance cutting tool specifically designed for medium-deep hole precision machining. Made from solid carbide material and equipped with an axial internal cooling channel, it enables efficient and stable chip evacuation and cooling at a drilling depth of 5 times the diameter (5×D). It is widely used for CNC machining of difficult-to-cut materials such as stainless steel, alloy steel, and cast iron.

• Efficient Chip Evacuation — Internal coolant pressure flushes chips from the bottom of the hole, preventing chip clogging and drill bit breakage.
• Extended Tool Life — Coolant reaches the cutting zone directly, reducing cutting temperature by 30-50%.
• Improved Machining Accuracy — The straight-shank design ensures high concentricity, with hole diameter tolerances achievable up to H7-H8.