Screws are one of the most versatile and important fasteners, from simple, everyday tasks to complex product design. But there are many different types of screws and determining the correct ones for a particular job can be tricky. From head-size to length, a lot of variables must be taken into account when choosing the proper screw for a job.

The first factor to consider is the screw head-size, which can be round, flat, oval, or pan. The type of head you choose will impact not only the appearance of your finished product but also what tools you can use to install it. For example, a flat countersunk screw will rest flush with the surface of the material it is being installed in, while an oval countersunk screw will have its point end extend below the surface.

Once you have decided on a head-type, the next factor to take into account is the screw size, which includes its diameter and thread spacing. These values are typically expressed in either metric or imperial measurements. The imperial system commonly uses a three-value set, with the first number indicating the diameter and the second indicating the thread spacing (or pitch). The third value is usually the screw’s length.

The sizing of wood screws is particularly complicated by factors like the thickness and density of the material, lateral versus sheer forces on the shank, and whether the screw will be used in a pilot hole or not. For this reason, it is often best to consult a member of the Jaycon Systems team for project-specific guidance when choosing the appropriate screw size, length, and gauge.1/4" to mm