{"product_id":"p-1874781","title":"0.85mm Micro Drill Bits 3.175mm Shank Carbide for Print Circuit Board 20pcs","description":"√FEATURE:\u003cbr\u003eMicro drill bit crafted from ultra-hard 92% Tungsten Carbide (WC) with 8% Cobalt (Co) binder\u003cbr\u003eExceptional Hardness (HRA 89-95) – 3× longer life than HSS\u003cbr\u003eUnmatched Wear Resistance - for stainless steel \u0026amp; hardened alloys\u003cbr\u003eHigh-Temperature Stability - Maintains cutting edge at 800°C+\u003cbr\u003ePrecision-Ground Flutes - Optimized chip evacuation \u0026amp; reduced heat buildup\u003cbr\u003eAn uncoated (Bright) surface - reduces friction resistance during cutting\u003cbr\u003eThe 135-degree tip angle - provides excellent processing stability\u003cbr\u003e\u003cbr\u003e√APPLICATION:\u003cbr\u003eTungsten 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.\u003cbr\u003eThe 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.\u003cbr\u003e\u003cbr\u003e√PACKING LIST:\u003cbr\u003e-Cutting Edge Diameter: 0.85mm\/0.03346inch\u003cbr\u003e-Shank Diameter: 3.175mm (1\/8inch) shank diameter\u003cbr\u003e-Flute Length: 8.3mm\/0.33inch\u003cbr\u003e-Total Length: 38mm\/1.5 inch\u003cbr\u003e-Package Content: 20pcs x Mini Drill\u003cbr\u003e\u003cbr\u003e√NOTE:\u003cbr\u003eWhen machining different materials, the spindle speed and feed rate vary.\u003cbr\u003eGenerally, the harder the material, the lower the spindle speed and feed rate need to be.  \u003cbr\u003ePosition the twist drill at 90° to the workpiece.\u003cbr\u003eFor thick materials, drill in multiple passes to prevent overheating or breakage.\u003cbr\u003eUse cutting fluid to improve efficiency, extend tool life, and reduce material damage.\u003cbr\u003eFor specific speed and feed rates recommended for common materials, please refer to the details provided on the product page.","brand":"Harfington","offers":[{"title":"Default Title","offer_id":47237669617913,"sku":"f25070700ux0115","price":8.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0595\/2477\/6095\/files\/ux_f25070700ux0115_ux_g03.jpg?v=1778514558","url":"https:\/\/www.harfington.com\/en-gb\/products\/p-1874781","provider":"Harfington","version":"1.0","type":"link"}