Slotted Semi-countersunk Head Wood Screw

The slotted semi-countersunk head wood screw is a kind of fastener used for the connection of wood. It has some similarities with the slotted countersunk head wood screw in terms of structural features, dimensional specifications, materials, etc., but it also has some of its own characteristics:

Structural Features of the Slotted Semi-countersunk Head Wood Screw

Head Shape: The semi-countersunk head design is its main feature. This head shape is between the countersunk head and the round head. After installation, part of the head sinks into the surface of the wood, and the other part protrudes slightly, forming a shape similar to a spherical surface. In this way, it can ensure the flatness of the connection surface to a certain extent, and also retain a certain protruding part of the head, which is more suitable for some occasions that require both aesthetics and operational convenience.

Slotted Design: Just like the slotted countersunk head wood screw, there is a single-slot in the shape of a straight line on the head, which is convenient for tightening or loosening operations with a screwdriver. It can effectively transmit torque and enable the screw to be screwed in and out smoothly.

Thread Part: It is usually a coarse thread with a relatively large thread profile angle and a relatively deep thread depth to enhance the grip in the wood. The pitch of the thread varies according to the diameter and length of the screw. The pitch of screws with a larger diameter is relatively larger, which helps to screw into the wood quickly and provide a firm connection.

Dimensional Specifications of the Slotted Semi-countersunk Head Wood Screw

The diameter generally ranges from 1.6 to 10 millimeters, and common specifications include 2.5 millimeters, 3 millimeters, 4 millimeters, etc. The length usually ranges from 6 to 150 millimeters, such as 10 millimeters, 20 millimeters, 30 millimeters, etc., to meet the connection requirements of woods with different thicknesses.

The way to express the specifications is similar to that of the slotted countersunk head wood screw, expressed as "diameter × length". For example, "3×20" represents a slotted semi-countersunk head wood screw with a diameter of 3 millimeters and a length of 20 millimeters.

Materials of the Slotted Semi-countersunk Head Wood Screw

It usually adopts carbon steel material and undergoes heat treatment and surface treatment, such as galvanizing, nickel plating, etc., to improve the strength and corrosion resistance of the screw, prevent rusting, and extend the service life.

For environments with special corrosion resistance requirements, stainless steel material will be selected to ensure that it can still maintain good performance in corrosive environments such as humidity, acids, and alkalis.

Working Principle of the Slotted Semi-countersunk Head Wood Screw

When using a screwdriver to screw the slotted semi-countersunk head wood screw into the wood, the thread cuts out a spiral channel in the wood. The wood fibers are squeezed and deformed and surround the thread, generating frictional force and clamping force, thus connecting the wood together.

The semi-countersunk head design makes the connection surface relatively flat while ensuring the connection strength. The protruding part of the head is also convenient for using tools to screw the screw again when necessary. Compared with the fully countersunk head design, it is more operable during subsequent maintenance or adjustment.

Application Fields of the Slotted Semi-countersunk Head Wood Screw

Furniture Manufacturing: It is quite common in furniture assembly. For example, it is used to connect the frame and panels of furniture, which can not only make the connection part relatively flat but also make it convenient to find the head of the screw for operation when disassembly or adjustment is required. It may be used in parts such as the connection between the table legs and the tabletop of some solid wood tables, and the connection between the side panels and the top panel of cabinets.

Architectural Decoration: In interior decoration, it can be used to fix some wooden components that require a certain degree of aesthetics and may need later adjustment. For example, when installing wooden decorative lines, using slotted semi-countersunk head wood screws can fix the lines on the wall. The semi-countersunk head design makes the surface of the lines flatter, and it is also convenient to deal with the situation when the lines become loose or need to be replaced.

Wooden Handicraft Production: When making wooden handicrafts, the slotted semi-countersunk head wood screw is a good choice for some parts that require both a firm connection and a certain degree of decoration. For example, when making a wooden box, it is used to connect the box body and the box cover. The appearance of the semi-countersunk head can increase the delicacy of the handicraft, and it can also ensure the reliability of the connection.

Precautions for Selecting the Slotted Semi-countersunk Head Wood Screw

Select the size according to the thickness of the wood and the connection requirements: It is necessary to ensure that the length of the screw can properly penetrate the connected wood component. Generally, it needs to be slightly longer than the total thickness of the wood to ensure an adequate amount of thread embedding to provide a firm connection, but it should not be too long to avoid piercing through the surface of the wood. For parts that bear a large tensile force or shear force, screws with a larger diameter should be selected; for parts with a smaller force, screws with a smaller diameter can be selected.

Consider environmental factors: In humid, water-prone, or corrosive environments, slotted semi-countersunk head wood screws made of stainless steel material or with good anti-corrosion treatment should be selected to prevent rusting and corrosion from affecting the connection performance. In a high-temperature environment, the thermal stability of the screw needs to be considered, and appropriate materials and specifications should be selected to ensure that the connection is not affected by temperature changes.