Through-hole mounting (thru-hole) of electronic components involve the use of axial and radial leads that are inserted into holes drilled in printed circuit boards and soldered to pads on the opposite side either by the manual soldering or selective soldering robots. Henway Technologies uses both kinds.

Through-hole mounting has benefits such as:

• Debug/rework/swapping components is easier because the components are physically larger. 

• Better heat dissipation in many cases

• Strength and endurance for environmental and mechanical stress

The additional drilling required can make the boards more expensive to produce if the number of holes exceeds what’s reasonable. Henway Technologies does not charge extra for holes but some manufacturers require that the number of holes per board is entered into their online calculator in order to produce a quote.

When getting a PCB assembly quote you must specify how many total unique parts, how many total SMT placements, and how many through-hole placements. SMT and through-hole are kept separate because the cost to place either component is different (through-hole costs more). 

PCB assembly companies such as Henway Technologies trains and certifies their through-hole soldering technicians to IPC standards to ensure all solder joints meet or exceed the requirements for Class 1, 2, and 3 assemblies. 
See these videos if you’re interested in learning more about through-hole soldering: