SMT, PCB Electronics Industry News


May 16, 2019

Many Cusromers inquiry Headpcb's capabilty of counter sink board, and they are easy to mismatch counter sink with counterbore. In fact, there have big difference between counter sink and counterbore, today Headpcb's senior RD engineer Macros Zhang spare an article about  counter sink and counterbore, hope this will help you having a better understanding about them.


Countersinking is done by making a cone shaped hole which allows a flat head fastener to sit flush when installed. This prevents any snagging or damage from the top of the fastener, which can happen if it isn't flush to the surface.

With wood if you don't countersink and force the screw into the surface it will not only look bad, but the stability of the wood will be compromised. The wood can crack and split from the screw being forced and the fibers become damaged and dented. Countersinking also allows you to have all your screws at the same consistent depth.


Counterbore is a similar concept to countersinking except the hole is bigger with a flat bottom to allow the screw or bolt to fit into and be flush to the surface. The screw or bolt has a flat underside that allows a sturdy stable hold.

The counterbore is often made large enough for a socket to go on the fastener for attachment.

The below anatomy will help to understanding them more easily.


The Counter sink are used more in Headpcb's experience, so we explain the application ans angles for counter sink individually.

Countersinks have a greater range of applications and angles. In Headpcb's drill bite warehouse, standard sizes include 60°, 82°, 90° as well as less popular 100°,110⁰ and 120° included angles.  Because of the angle on this shank driven rotary tool they can be used to remove burrs or chamfer the corner of a part.

Many styles of countersink are popular and each has distinct advantages. Fluteless countersinks are cone shape in the desired included angle with a hole drilled through the side of the cone, clearance exists to ensure free cutting. The most practical use is deburring.

Single and multiple flute countersinks are used to chamfer threaded holes or provide a good seat for counter sunk fastener. There are also tools designed to chamfer or face the back side of a drilled or tapped hole. The shank of the tool is inserted through the drilled or tapped hole and a cutter is assembled on the back side.  The tool is then rotated and performs the chamfering or face operation.

Additionally there is another similar tool called a combination drill and countersink.  These doubled ended tools are used to produce a center in the end of a round product so that the part can be held between centers on a lathe or CNC machine.

May 16, 2019 -

Immersion gold VS Plating gold

May 16, 2019 -

Resin plug application and process

Jul 10, 2012 -

chinese famous pcb(printed circuit board) manufacturer with top quality and lower price

May 22, 2019 -

Get to Know Your PCB Printer Stencil Wiping Roll

May 22, 2019 -

Get to Know Your PCB Printer Stencil Wiping Roll

May 21, 2019 -

SpiderSoM Opens Broad Access to FPGA Technology

May 20, 2019 -

National Circuit Assembly Hires New VP of Operations

May 20, 2019 -

Scienscope Introduces New Team Leader for X-ray Division Danny Lumbreras - U.S. Sales Manager

May 20, 2019 -

SCS to Host New Webinar: “Robust, Lightweight Protection for Challenging Harsh Environments Using Parylene Conformal Coatings”

May 20, 2019 -

Thermaltronics Offers Free Review and Trials of Soldering Robot

May 20, 2019 -

KYZEN to Exhibit at the 16th Philippine Semiconductor & Electronics Convention and Exhibition

May 20, 2019 -

East/West Manufacturing Enterprises Purchases New X-Ray System

May 20, 2019 -

SMTA Releases Free BGA Defect Guide for Download

See electronics manufacturing industry news »

COUNTER SINK VS COUNTERBORE news release has been viewed 64 times

3D solder paste inspection system