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Harfington 0.85mm Micro Drill Bits 3.175mm Shank Carbide for Print Circuit Board 20pcs
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0.85mm Micro Drill Bits 3.175mm Shank Carbide for Print Circuit Board 20pcs

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About this item
  • PACKING LIST: 20 packs of micro drill bits in 0.85mm/0.03346inch cutting diameter, 3.175mm (1/8inch) shank diameter, 8.3mm/0.33 inch flute length, 38mm/1.5 inch overall length, 135° point angle, suitable for processing small components. NOTE: color is random
  • FEATURE: Our carbide twist drills combine ​92% Tungsten Carbide / ​​8% Cobalt for extreme hardness (HRA 89-95), wear resistance (3x HSS life), and heat stability (800°C+). Featuring razor-sharp cutting edges and precise milling grooves, ensuring maximum productivity and durability in demanding applications.
  • APPLICATION: With their high hardness, wear resistance, and precision machining capabilities, cemented carbide mini drill bits are widely used in high-precision applications, including electronics manufacturing (PCB micro-hole drilling), precision machinery (micro-component processing, micro-hole machining)
  • INSTRUCTION: Make sure the workpiece is firmly clamped (such as using a vise or fixture) to prevent it from sliding during drilling. Position the twist drill at 90° to the workpiece. For thick materials, drill in multiple passes to prevent overheating or breakage.
  • NOTE: When machining different materials, the spindle speed and feed rate vary. Generally, the harder the material, the lower the spindle speed and feed rate should be. Always use coolant in high-speed machining to protect carbide tools from heat-induced failure.
  • In stock, ready to ship
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About this item
  • PACKING LIST: 20 packs of micro drill bits in 0.85mm/0.03346inch cutting diameter, 3.175mm (1/8inch) shank diameter, 8.3mm/0.33 inch flute length, 38mm/1.5 inch overall length, 135° point angle, suitable for processing small components. NOTE: color is random
  • FEATURE: Our carbide twist drills combine ​92% Tungsten Carbide / ​​8% Cobalt for extreme hardness (HRA 89-95), wear resistance (3x HSS life), and heat stability (800°C+). Featuring razor-sharp cutting edges and precise milling grooves, ensuring maximum productivity and durability in demanding applications.
  • APPLICATION: With their high hardness, wear resistance, and precision machining capabilities, cemented carbide mini drill bits are widely used in high-precision applications, including electronics manufacturing (PCB micro-hole drilling), precision machinery (micro-component processing, micro-hole machining)
  • INSTRUCTION: Make sure the workpiece is firmly clamped (such as using a vise or fixture) to prevent it from sliding during drilling. Position the twist drill at 90° to the workpiece. For thick materials, drill in multiple passes to prevent overheating or breakage.
  • NOTE: When machining different materials, the spindle speed and feed rate vary. Generally, the harder the material, the lower the spindle speed and feed rate should be. Always use coolant in high-speed machining to protect carbide tools from heat-induced failure.
Specification

Specification

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Product Description:
√FEATURE:
Micro drill bit crafted from ultra-hard 92% Tungsten Carbide (WC) with 8% Cobalt (Co) binder
Exceptional Hardness (HRA 89-95) – 3× longer life than HSS
Unmatched Wear Resistance - for stainless steel & hardened alloys
High-Temperature Stability - Maintains cutting edge at 800°C+
Precision-Ground Flutes - Optimized chip evacuation & reduced heat buildup
An uncoated (Bright) surface - reduces friction resistance during cutting
The 135-degree tip angle - provides excellent processing stability

√APPLICATION:
Tungsten carbide twist drill bits (0.85mm) excel in precision applications: PCB micro-drilling (0.15-3mm holes), device components, aerospace turbine cooling holes, maintaining micron-level accuracy in demanding industrial environments.
The drills are suitable for high-hardness metals, such as steel, alloy cast iron, stainless steel, iron, copper, aluminum alloy, and cast iron. They are also effective in plastics and wood.

√PACKING LIST:
-Cutting Edge Diameter: 0.85mm/0.03346inch
-Shank Diameter: 3.175mm (1/8inch) shank diameter
-Flute Length: 8.3mm/0.33inch
-Total Length: 38mm/1.5 inch
-Package Content: 20pcs x Mini Drill

√NOTE:
When machining different materials, the spindle speed and feed rate vary.
Generally, the harder the material, the lower the spindle speed and feed rate need to be.  
Position the twist drill at 90° to the workpiece.
For thick materials, drill in multiple passes to prevent overheating or breakage.
Use cutting fluid to improve efficiency, extend tool life, and reduce material damage.
For specific speed and feed rates recommended for common materials, please refer to the details provided on the product page.
Warning: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
£8.00 Regular price
/
Wholesale Price
20%OFF
Order $5000+
  • 20%OFF
    Order $5000+
  • 15%OFF
    Order $2000+
  • 10%OFF
    Order $800+
  • 7%OFF
    Order $500+
  • 5%OFF
    Order $200+
  • In stock, ready to ship
Cart
Cart
Free Shipping over $20

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Description

Description

√FEATURE:
Micro drill bit crafted from ultra-hard 92% Tungsten Carbide (WC) with 8% Cobalt (Co) binder
Exceptional Hardness (HRA 89-95) – 3× longer life than HSS
Unmatched Wear Resistance - for stainless steel & hardened alloys
High-Temperature Stability - Maintains cutting edge at 800°C+
Precision-Ground Flutes - Optimized chip evacuation & reduced heat buildup
An uncoated (Bright) surface - reduces friction resistance during cutting
The 135-degree tip angle - provides excellent processing stability

√APPLICATION:
Tungsten carbide twist drill bits (0.85mm) excel in precision applications: PCB micro-drilling (0.15-3mm holes), device components, aerospace turbine cooling holes, maintaining micron-level accuracy in demanding industrial environments.
The drills are suitable for high-hardness metals, such as steel, alloy cast iron, stainless steel, iron, copper, aluminum alloy, and cast iron. They are also effective in plastics and wood.

√PACKING LIST:
-Cutting Edge Diameter: 0.85mm/0.03346inch
-Shank Diameter: 3.175mm (1/8inch) shank diameter
-Flute Length: 8.3mm/0.33inch
-Total Length: 38mm/1.5 inch
-Package Content: 20pcs x Mini Drill

√NOTE:
When machining different materials, the spindle speed and feed rate vary.
Generally, the harder the material, the lower the spindle speed and feed rate need to be.  
Position the twist drill at 90° to the workpiece.
For thick materials, drill in multiple passes to prevent overheating or breakage.
Use cutting fluid to improve efficiency, extend tool life, and reduce material damage.
For specific speed and feed rates recommended for common materials, please refer to the details provided on the product page.
Warning: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
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