Construction screw 5x90, FUR-038

Construction screw 5x90, article FUR-038 — a specialized high-strength fastening element for professional assembly of furniture made from solid natural wood, glued laminated timber, and wood composite materials. Length of 90 millimeters and diameter of 5 millimeters ensure deep penetration into the wood structure, creating a strong load-bearing connection capable of withstanding significant static and dynamic loads. Construction screws represent a modern alternative to traditional furniture dowels, providing invisible and extremely reliable connections between elements without the need for metal brackets or surface plates.

Manufacturing materials and protective coating

The shank of the construction screw FUR-038 is made of high-carbon alloyed steel, which provides exceptional tensile and bending strength. Special heat treatment — quenching followed by tempering — imparts the fastener with an optimal combination of hardness and ductility. The hardened surface resists abrasion and deformation, while the ductile core prevents brittle failure under impact loads and bending moments.

Threaded part construction and thread geometry

Threaded part of the construction screw is designed with variable pitch and increased thread depth. Double-threaded design creates two parallel threads, which speed up the screwing process by 2 times compared to single-threaded analogs. Sharp cutting edges of the thread cut into wood fibers, creating a secure grip without damaging the material structure. The incomplete thread occupies approximately 50-55 millimeters of the screw length, leaving a smooth central part of the shank.

The smooth part of the shank without threads plays a critically important role in creating clamping connections. When the screw head contacts the first part, and the thread works only in the second part, the smooth part freely passes through the first part without creating resistance. This ensures tight contact between connected elements without gaps or gaps. Such a design is ideal for assembling furniture carcasses, connecting tabletops, and mounting heavy structural elements.

The smooth portion of the screw shaft without threads plays a critically important role in creating clamping connections. When the screw head contacts the first part, and the threads engage only in the second part, the smooth section freely passes through the first part without creating resistance. This ensures tight, gap-free contact between connected elements. This construction is ideal for assembling furniture carcasses, connecting tabletops, and mounting heavy structural components.

Cutting grooves and self-tapping technology

The shank of the construction screw FUR-038 has sharp longitudinal cutting grooves that serve as an integrated chip removal system. During screwing, these grooves instantly cut and eject wood chips from the installation channel, preventing jamming of the fastener and reducing load on the drill. Cutting ridges are especially important when working with long screws, where chip accumulation deep in the hole could create critical resistance.

Countersunk head and invisible fastening system

The head of the construction screw is designed in a countersunk configuration with a conical profile at a 60-degree angle. When fully tightened, the conical part of the head enters the material's countersink, and the upper flat part becomes flush with the wood surface or is recessed 1-2 millimeters below. This design ensures the creation of an invisible connection, where the fastener does not protrude above the surface and does not interfere with the installation of surface-mounted parts.

Under the screw head is a stabilizing zone with a double angle, which ensures optimal centering during screwing and even distribution of clamping force. This structural feature prevents screw misalignment during tightening and eliminates wood compression around the head. The location of the countersunk screw can be easily concealed with wood-colored putty, decorative plugs, or furniture wax, making the connection completely invisible.

Located beneath the screw head is a stabilizing zone with a double angle, which ensures optimal centering during tightening and even distribution of clamping force. This structural feature prevents screw misalignment during tightening and eliminates wood compression around the head. The location of the concealed screw can be easily concealed with wood-colored putty, a decorative plug, or furniture wax, making the connection completely invisible.

TORX T-25 slot and advantages of star-shaped profile

The head of the screw FUR-038 is equipped with a TORX T-25 slot — a six-pointed star-shaped system that ensures maximum efficient transmission of torque from the tool to the fastener. Unlike Phillips or Pozidriv cross slots, the TORX profile creates contact along the side edges rather than in the recesses, distributing the load evenly and preventing the bit from being ejected from the slot under high torque.

key TORX T-25or a bit of similar size, which will ensure comfortable and safe installation.or a bit of similar size, which will ensure comfortable and safe installation.

Application in furniture manufacturing and woodworking

Construction screws 5x90 are indispensable for manufacturing solid wood furniture, where invisible strong connections are required without using traditional metal hardware. Assembly of dining tables, coffee tables, and work surfaces made from glued laminated timber of 40-60 millimeters thickness requires reliable fastening — screws FUR-038 create a strong clamping connection that withstands vertical and horizontal loads without weakening over time.

Assembly of frame structures and load-bearing elements

Manufacturing bed, sofa, and cabinet frames from solid wood requires exceptionally strong fasteners capable of withstanding dynamic loads and vibrations. Construction screws FUR-038 provide reliable connection of longitudinal and transverse beams with cross-sections of 40x40 or 50x50 millimeters. Length of 90 millimeters allows the screw to fully pass through the first part and deeply penetrate into the second, creating a strong connection that does not weaken under constant loads.

Assembly of chair backs, armrests of chairs, and load-bearing furniture elements is performed using construction screws driven through the ends of parts. This mounting technique makes the fastener completely invisible from the front surfaces and ensures an aesthetically pleasing appearance of the finished product. The countersunk head allows covering the fastening location with a decorative plug or leaving it open — in either case, the connection looks neat and professional.

Assembly of chair backs, armrests of chairs, and load-bearing furniture elements is performed using structural screws driven through the ends of parts. This mounting technique makes the fastening completely invisible from the front surfaces and ensures an aesthetically pleasing appearance of the finished product. The concealed head allows covering the fastening location with a decorative plug or leaving it open — in either case, the connection looks neat and professional.

Mounting hardware and installation of furniture legs

Construction screws FUR-038 are actively used for installingfurniture for furniture legsand fastening elements. Mounting wooden mounting plates, metal brackets, and foot supports requires reliable deep fastening that ensures stability of supports even under significant furniture weight. Screws 90 millimeters long pass through the mounting plate and embed into solid wood to a depth of 70-80 millimeters, creating a high-strength load-bearing connection.

Installation of adjustable washers and bolts for furniture legs is performed through wooden bases or directly into the solid wood body of the furniture. Construction screws ensure secure fastening of fasteners without risk of loosening or thread disengagement. The combination of FUR-038 screws with various typesfurniture hardwareallows creating universal fastening systems for any type of furniture.

Technology of proper installation and installation recommendations

To achieve maximum connection strength when working with FUR-038 construction screws, certain installation rules must be followed. When joining parts up to 40 millimeters thick, no pre-drilling is required — the self-tapping tip easily enters the wood structure. For hardwoods with density above 700 kg/m³, it is recommended to drill a pilot hole of 3–3.5 mm diameter to a depth of 40–50 mm.

Screwing the screw should be performed at a medium drill speed of 800–1200 rpm with a torque limiter set at 8–10 Nm. Excessive rotational speed causes overheating of the fastener and burning of the wood around the hole, while excessive tightening torque may strip the threads or break the screw. When working with soft coniferous woods, the tightening torque should be reduced to 6–8 Nm to prevent compression of the wood under the head.

Working with various types of wood

Construction screws FUR-038 are universally applicable for all types of wooden materials. Soft coniferous woods — pine, spruce, cedar — easily accept screws without pre-drilling even in dry condition. Medium-hardness deciduous woods — birch, aspen, linden — also do not require hole preparation provided a quality drill with power of 18 Volts is used.

Hard deciduous woods — oak, beech, ash, acacia — have high density and require a more careful approach. For these materials, it is recommended to drill a pilot hole of 3 mm diameter to a depth of 30–40 mm. Such preparation reduces the risk of splitting the wood and facilitates screwing. When working with oak, especially, it is crucial not to over-tighten the connection, as excessive torque may lead to hidden cracks in the wood structure.

Application in working with wood composites

Construction screws FUR-038 work effectively with particleboard, MDF, OSB, and plywood. When installing in particleboard 16–22 mm thick, the screw creates a strong connection capable of withstanding up to 150–180 kg of pull-out load. For laminated boards, a concealed head is especially important, as it does not damage the decorative finish and neatly embeds into the material structure.

Working with multi-layer plywood 18–24 mm thick requires caution during tightening — the screw must pass through all veneer layers without delamination. Construction screws with sharp tips minimize the risk of delamination due to clean fiber cutting. When assembling plywood structures, screws should be placed at least 30 mm from the edge of the part and 50 mm apart from each other to ensure even load distribution.

Advantages of using in professional furniture assembly

Construction screws FUR-038 significantly speed up furniture assembly compared to traditional fastening methods. The absence of need for pre-drilling saves up to 40% of installation time. Invisible connections eliminate the need for decorative plates and plugs, reducing the cost of finished furniture. High fastener strength allows reducing the number of connection points without compromising structural reliability.

The universal application of construction screws makes them indispensable fasteners in the professional furniture maker’s toolkit. One size 5x90 is suitable for solving many installation tasks — from assembling frames to installingfastening hardware. This simplifies material logistics and reduces warehouse inventory.

Economic efficiency and longevity of connections

Investment in quality construction fasteners pays off through increased lifespan of furniture items and reduced percentage of production defects. Connections using FUR-038 construction screws retain strength for decades without weakening or loosening. Protective zinc coating prevents corrosion, eliminating rust stains on light-colored wood and painted surfaces.

Fastener reliability reduces customer complaints and warranty claims. Furniture assembled with construction screws withstands multiple disassembly-reassembly cycles during moves without damaging connections. Fastener longevity is especially important for commercial furniture in offices, restaurants, and public spaces, where intensive use requires maximum reliability.

Compatibility with Stavros hardware assortment

The Stavros online store offers comprehensive solutions for furniture production, where FUR-038 construction screws perfectly complement other catalog items. Mounting plates, wooden bases, adjustable washers and metric bolts fromhardware assortmentare installed using construction screws to create strong, durable connections.

Furniture leg fastening kits often require additional fixation with threaded connections — FUR-038 screws provide secure fastening of all system elements. Wooden mounting plates at a 10-degree angle are installed on construction screws to create angled supports. Wool and plastic washers are mounted to the furniture base through pre-installed wooden platforms using construction screws.

Purchase construction screws 5x90, article FUR-038 from the Stavros store — the choice of professional furniture makers and carpenters who value reliability, fast installation, and flawless fastener connections.