extended length Tungsten Carbide Twist Drill Bit

• Material: tungsten carbide
• Size: 1.0mm-13mm
• length:100mm or customized
• Super sharpness and wear resistance.
• Used for stainless steel, cast iron, mould steel, carbon steel etc.

Technical Data

• Material & Hardness: Ultra-fine grain tungsten carbide (e.g., YG10X), HRA 89+ or HRC 92 – 94, compatible with workpieces up to HRC 65.
• Key Dimensions: Diameter 0.3 – 40mm, overall length 38 – 330mm (customizable), 2 flutes common; tip angle 118°/135°, spiral angle 15° – 35°, tolerance up to 0~-0.01mm.
• Coatings & Precision: TiAlN, AlTiN, DLC coatings available; machining precision ±0.005 – 0.01mm.
• Cutting Params: Suitable for CNC machines; adaptable to oil mist, water – cooling modes; feed rate and speed need proper reduction for overlength extension.

Advantages

• Deep/Hard-to-Reach Drilling: Extra length enables deep hole machining and access to narrow, hard-to-reach areas of workpieces.
• Stable & Precise: Large core diameter and polished flutes reduce vibration; special drill tip enhances centering, avoiding drilling deviation.
• Durable & Wear-Resistant: Tungsten carbide plus high-heat-resistant coatings boost wear/heat resistance, extending service life vs. HSS bits.
• Efficient Chip Evacuation: Smooth, wide spiral flutes speed up chip discharge, preventing clogging and heat accumulation during drilling.
• Wide Adaptability: Fits stainless steel, cast iron, titanium alloy, etc., applicable to CNC machining centers and drilling machines; supports ODM/OEM customization.