Printed circuit boards are usually made of fiberglass (FR4), which is highly abrasive and given the many hundreds or thousands of holes on modern circuit boards, requires the use of specialist drill bits. PCB Supplies supplies the highest of quality Drill Bits manufactured by Union Tools. These Drill Bits are made of top quality Tungsten Carbide.

We hold stock of standard drills in the ST and UC Series. The ST Series are a universal drill bit witch can be used for many materials. The UC Series bits are and undercut bit which is used for small through holes or via interconnectors, they allow improved inner hole wall quality, whilst maintaining good registration accuracy. This makes them ideal for high density multilayer boards.

The drill bits are perfect for drilling FR-4 circuit board materials. The drill element is fabricated of solid carbide since carbide is the preferred material for drilling glass epoxy circuit board laminates due to its exceptional hardness. These carbide bits are capable of several hundred or even thousands of hits before significant degradation of sharpness. The number of holes that can be drilled is dependent on a number of factors including feed rate, speed, material characteristics, and what the user considers acceptable hole quality. Due to the brittleness of carbide these drill bits are recommended for use with drill presses or precision equipment. Care must be taken not to drop or flex them as breakage may occur.

Features

• Common 3.15mm 1/8" shanks
• Solid carbide drill element
• Designed for high speed equipment operating up to 80,000 RPM
• Can be used at lower speeds by using a slower feed rate

We also stock Extended Flute Drills of the STX series which have elongated flutes in comparison to the equivalent standard version in the same diameter.

Finally we stock Micro Drills in the MV and MC Series these are ideal for through holes and blind via hole drilling. These drills are made of hyper fine grade carbide alloy to ensure they are robust.

We recommend that bits are fitted with depth setting rings This will allow you to set the plunge depth stop on your drill press to a single value that will work for all bit diameters.
All of our bits can be purchased with or without rings. When ordering drills with depth rings, you may specify the depth ring position to suit your requirements.