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Construction Lag Screws
Frequently asked questions
What are construction lag screws?
Construction lag screw are long screws with a wide head that are most commonly used for securing wood. Think of canopies, porches, or cabins. Due to the wide screw head, construction lag screws have a high clamp force and large bearing surface. Construction lag screws are also known as cup head screws, wood construction screws, or pan head screws. Construction lag screws are seen as the replacement of wood bolts because they are much easier to use. The screws have a deep Torx drive head and have a sharp thread-cutting point, so they easily cut into the wood.
How long do my construction lag screws need to be?
For construction lag screws, it is important to know that the screw needs to go a minimum of 5 cm into the support beam or post. For example, if you want to join a 10 cm beam to a support beam, you need a 150 mm construction lag screw. Note: this is the minimum length for the screw. You cannot go wrong with using a screw that is a bit longer, so you can be flexible with the length. In short, the calculation for the length of the construction lag screw is: thickness of the beam + 5 cm.
How do I pre-drill for construction lag screws?
When you are using hardwood beams, it is important to pre-drill the holes. Use a drill bit that is 2 mm thinner than the construction lag screw. For example, for a construction lag screw of 6 mm, pre-drill with a drill bit of 4 mm. Do you need to drill deep holes? Then use auger drill bits. Also, for joining beams thicker than 80 mm, we recommend pre-drilling to prevent the screw from going in at an angle.
How wide is the head of a construction lag screw?
The wide head of the construction lag screw creates the high clamp force. The rule is: the thicker the screw, the wider the head. The first number in the title is the thickness of the screw. For example, an 8.0 x 150 mm screw has a thickness of 8 mm. A small overview:
Thickness construction lag screw
|Width screw head|
|6 mm||14 mm|
|8 mm||22 mm|
|10 mm||25 mm|
Which construction lag screw do I need?
Construction lag screws are available in grey galvanised steel, yellow galvanised steel, stainless steel, and with a special coating for hardwood. The grey galvanised screw is also available with a black head, so you can also find black galvanised screws. These screws are made for when you are working with black wood. When do you use the other screws?
Stainless steel construction lag screws are for projects that do not ask too much of the screw. With stainless steel screws, you are guaranteed that the screws will not rust, making them perfect for humid rooms. Because these screws are a bit softer, we recommend pre-drilling the wood.
Construction lag screws made from galvanised steel are often used for heavy construction, because they are incredibly strong. You only need to pay attention that you do not damage the screw, since this can result in oxidation in the long term. Yellow galvanised screws are slightly stronger and rust-resistant than grey galvanised screws.
Coated construction lag screws are coated with a special AR-coating. This coating protects the screw against the tannic acid in wood species like red cedar, oak, and garapa. An extremely strong screw with a protective layer.
How do I countersink construction lag screws?
Countersinking construction lag screws is made easy with spade drill bits. The size of the spade drill bit is determined by the size of the screw. A 6 mm construction lag screw needs a 14 mm spade drill bit, an 8 mm screw needs a 22 mm drill bit, and a 10 mm screw needs a 25 mm drill bit.
Carefully drill a few millimetres into the wood and the construction lag screw will sink in perfectly.
More and more Handyman companies, gardeners and timber merchants are choosing Wovar because of
- Extra discounts for large consumers;
- Direct contact with a trained specialist;
- Detailed order history;
Wovar Construction Lag Screws
These construction lag screws are also called the successor of the coach screws. After all, thanks to the Torx 40 head, these can be processed faster. More and more handymen are discovering this screw when building canopies and verandas from Larch Douglas or impregnated wood. Construction lag screws are also known as cup head screws, wood construction screws, or pan head screws. Due to the large disc head, these screws also provide great clamping capacity and an enormous support surface, ideal for wooden constructions. Choose from galvanized construction lag screws, these are stronger than stainless steel but can oxidize slightly over time.
Wovar supplies wood construction screws made of blue galvanized, yellow galvanized, and stainless steel everywhere in Europe and beyond! You will also find coated wood construction screws for use in tannic-acid woods such as Oak, Garapa, and Red Cedar. In addition to construction lag screws, you have also come to the right place for carriage bolts at Wovar!
Wovar has 5 different types of construction lag screws, namely zinc-plated construction lag screws, yellow zinc-plated construction lag screws, stainless steel construction lag screws, black construction lag screws, and coated construction lag screws.
Zinc Plated Construction Lag Screws
Wovar supplies construction lag screws of galvanized steel and stainless steel A2 quality. The zinc-plated lag screws are stronger than stainless steel construction lag screws. Galvanized wood construction screws are therefore recommended for heavier constructions. Zinc plated construction lag screws may oxidize slightly if damaged. Therefore, use the high-quality Torx 40 bits from Wovar for mounting. These have a perfect fit on the wood construction screws and therefore extra grip when screwing in. Using bits with a perfect fit reduces the chance of the construction lag screws being damaged when screwing in. For extra comfort when installing our wood construction screws, Wovar recommends our magnetic bit holder with 2 free TX 40 bits.
Stainless Steel Construction Lag Screws
Stainless steel construction lag screws are more suitable for less taxing constructions such as a lean-to or woodshed. With stainless steel wood construction screws, you can be sure that you will not suffer from oxidation. Stainless steel A2 steel is softer than galvanized steel. As a result, the stainless steel construction lag screws have less strength than galvanized construction lag screws. The screws have a handy cutting type 17 auger point. Because stainless steel construction lag screws are softer than galvanized construction lag screws, pre-drilling is recommended. This is easy with our 6 mm hardwood drill bits.
Discover the construction lag screws from premium brand Wovar! Many wood construction projects opt for construction lag screws with Torx head. This allows you to work much faster than with coach screws. Additionally, Wovar construction lag screws with Torx are available in sizes up to 30 cm. The wood construction screw has an oblique angle screw thread. This makes it easier to screw the screw through the wood. Additionally, construction lag screws with a flat head can be neatly concealed in your material.
Construction lag screws of stainless steel A2 quality are extremely suitable for constructions with oak wood. Oak contains very harsh tannic acids. This can affect galvanized wood construction screws. This does not have any effect though on our stainless steel construction lag screws!
Yellow Zinc Plated Construction Lag Screws
Yellow zinc-plated construction lag screws match better with the color of Douglas Fir wood. In terms of strength, the construction lag screws are equal. Yellow zinc-plated construction lag screws are slightly better protected against rust and oxidation. This is due to the yellow zinc coating.
Black Construction Lag Screws
Looking for construction lag screws that are black? Then you have come to the right place at Wovar. The black construction lag screws are simply our strong yellow galvanized construction lag screws, but their head is provided with a beautiful black coating. In addition to being extremely strong, the yellow galvanized layer also makes them more rust-resistant.
Coated Construction Lag Screws for Hardwood
Do you use hardwood and do you want to be sure that you are using the correct screws? Wovar's coated wood construction screws have an additional protective AR coating. This protects the construction lag screws against the tannic acid that is in these hardwoods. The head of the construction lag screws has a coating that is made up of different layers so that the screw has a recovering capacity. This creates a permanent protection against corrosion.
Construction Lag Screws Ordered Today, Delivered Fast to your Home Right Away!
Order these galvanized construction lag screws now from premium brand Wovar. We supply private individuals, timber traders, gardeners, construction companies, carpentry companies, and other handymen. With a business account, these companies in the wood, construction, and garden industry receive additional benefits such as extra discounts.