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Speedometer head screws vs lag screws what's the difference?

 It is a common question at Sugatsune: "What is the difference between a counter-head screw and a lag screw?". Of course, you want to choose the right screw for your new job project. In this blog we explain the difference.

Difference between a counter-head screw and a lag screw?

The difference between counter-head screws and lag screws is immediately apparent when you look at the screws. A counter head screw has a wide counter head of approximately 21 mm with a torx 40 impression. A lag screw, on the other hand, has a large hex head that must be tightened with a socket, spanner, or ring spanner. Check out our amazing collection of aluminium door locks and handles

 

The advantage of screws with a torx impression is that they are easier to mount. But with a hex head you can apply more force while screwing in. However, pre-drilling is necessary for both screws. Pre-drilling ensures that the screws are turned straight into the wood. Pre-drilling also ensures that the risk of damage to the head is much smaller.

What are the benefits of a counter head screw?

Counter-head screws, also called cup-head screws, flange-head screws or wood construction screws, are also seen as the successor to lag screws. They are not only easier to assemble, but also provide more load-bearing capacity and a higher clamping range thanks to the large disc head. Counter head screws are available in four variants. Namely in stainless steel a2 steel, yellow galvanized with a black head, gray galvanized steel and yellow galvanized steel. The yellow galvanized counter-head screw is mainly used for roofs made of Larch Douglas wood. The yellow galvanized steel looks beautiful with Larch wood. In addition, this type of steel is more resistant to rust than gray galvanized counter-head screws and cheaper than stainless steel counter-head screws. Visit our plastic handle suppliers in Mumbai.

Sugatsune counter-head screws have a handy drill point with opposite threads. As a result, the screw enters the wood faster, which speeds up the screwing in process. In addition to the drill point, counter head screws also have handy shank ribs. This is also called a wokkel and is located above the screw thread. A wokkel ensures that tension is released from the screw and that the optimum bearing capacity is maintained. The screw also has less screw-in resistance, so your machine can screw in more screws per battery charge.

Why choose lag screws?

As described above, a counter-head screw has many properties that a lag screw does not have. For example, lag screws have no shank ribs, cutting point and a variant in yellow galvanized steel. Yet lag screws are still extremely popular today. This is because the hex head makes it possible to mount the bolts very tightly. You do this with a ring, nut or open-ended spanner. With a washer you create almost the same load-bearing capacity and clamping range as with counter-head screws. 

Threaded bolts are therefore still widely used for anchoring posts at point post holders , flat post holders and pergola connecting pieces .

In addition, black lag screws are widely used for mounting the Sugatsune black thumb heavy duty lift assist hinges.

Related post:

https://sugatsunekogyo.wordpress.com/2020/12/03/how-do-i-replace-a-mortise-lock/

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