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Frequently asked questions

Wafer Head Screws

These wafer head screws can be seen as the successor of the coach screws. This is because the Torx 40 drive allows you to work a lot faster. These wood screws are also referred to as washer head screws, construction lag screws, and structural screws. Due to the large head, the load is distributed evenly, and the screws have a high clamping range, which is ideal for wooden structures. More and more people are discovering these screws for building, for example, pergolas or sheds. 

Wafer head screws in all shapes and sizes

Wovar offers wafer head screws in galvanised steel, yellow galvanised steel, A2 and A4 stainless steel, coated steel, and with a black head. Coated screws are screws made specifically for use with wood types that contain tannic acid, such as oak, garapa, and red cedar wood. Further on, we will explain more about all the different types of screws we offer.

Stainless steel vs galvanised steel wood screws

Wovar offers these wood screws in galvanised steel, A2 stainless steel, and A4 stainless steel. Screws made from galvanised steel are stronger than those made from stainless steel. It is therefore recommended to use galvanised screws for heavier structures. However, galvanised screws are zinc plated, and when this zinc layer is damaged, they can oxidise. When used correctly, the likelihood of damaging this layer is significantly decreased. For example, use the correct torx 40 bits. By using screwdriver bits that fit the drive head exactly, you lower the chance of scratching the zinc layer. 

Stainless steel wood screws are better suited for lighter structures, such as a small shed or log store. Stainless steel is softer than galvanised steel, which means they are not as strong. Because of this, we recommend pre-drilling. The big advantage of stainless steel screws is that they do not rust. Additionally, while the tannic acids in, for example, oak affect galvanised screws, this is not the case for stainless steel screws. 

A2 and A4 stainless steel

Both A2 and A4 stainless steel screws are corrosion resistant. The main difference between the two types of steel is in the composition. Because A4 stainless steel has a slightly different composition than A2 stainless steel, it is even more corrosion resistant. This makes A4 stainless steel fasteners especially popular in coastal regions and for marine purposes. A4 stainless steel screws are also slightly stronger than A2 stainless steel screws. 

Discover the strength and efficiency of Wovar’s wafer head wood screws. These screws are available with torx drive and can be as long as 40 cm. The sharp cutting tip and diagonal threading make it easy to drive the screws into the wood. 

Yellow galvanised wafer head screws

Yellow galvanised wafer head screws blend in better with larch or Douglas wood. Compared to regular, grey galvanised screws, there is no difference in strength. The yellow galvanised screws are slightly better protected against corrosion thanks to the yellow zinc layer.

Black wafer head screws

Looking for screws that match your black hardware or black wood? Then our black wafer head screws might be just what you need. The screws are made of yellow galvanised steel, but the head is covered with a beautiful, black coating. These screws have the strength that comes with galvanised steel and the increased protection of yellow galvanised steel, finished off with a sleek, black coating.

Coated wood screws for hardwood

When you are working with hardwood, you want to be sure that you are using the correct screws. Wovar’s coated wafer head screws have received an extra AR-coating. This coating protects the screw against the tannic acid present in hardwood. The coating consists of several layers, which means the coating can fix itself when damaged. This creates permanent protection against corrosion as well as tannic acid. Combined with the strength of galvanised steel, these screws are perfect for heavy, hardwood structures.

Buy wafer head screws

Order wafer head wood screws in galvanised steel, stainless steel, or with a black head. Businesses in the construction and landscaping sector enjoy many benefits with a free business account.

Whether you are going to build a small log store or a large pergola with these wood screws, we also offer the other hardware you might need for your project. Explore our wide range of fasteners, including wall plugs, anchors and brackets, including pergola brackets, and tools, including hardwood drill bits