Construction screw 5x70, FUR-037

Construction screw 5x70, article FUR-037 — professional high-strength fastening element for mounting furniture made of solid wood, plywood, and glued laminated timber. Length of 70 mm and diameter of 5 mm provide optimal balance between connection strength and minimal risk of material splitting during driving. Construction screws FUR-037 are ideal for assembling medium-thickness frame elements, installing surface-mounted parts, and mounting furniture hardware, where reliable invisible connections without metal brackets or clamps are required.

Materials and protective anti-corrosion coating

The shank of the construction screw FUR-037 is made of high-carbon hardened steel with increased carbon content, providing exceptional tensile strength and resistance to deformation. The heat treatment includes full quenching of the shank followed by tempering, which gives the fastener an optimal combination of surface hardness and internal ductility. This structure allows the screw to bend under load without brittle fracture, which is critically important when working with wood, whose geometry constantly changes under humidity.

Protective coating with yellow zinc is applied by electrolytic zinc plating followed by chromating. A zinc layer thickness of 5-8 microns creates a reliable barrier protecting steel from corrosion, oxidation, and atmospheric moisture. The yellow passivation forms an additional chemically stable film, increasing corrosion resistance 3-4 times compared to simple zinc plating. The golden hue of the coating gives the fastener an aesthetic appearance and makes it less noticeable on light wood surfaces.

Thread construction and clamping effect optimization

The threaded portion of the construction screw FUR-037 has a length of approximately 40 mm, which is slightly more than half the total length of the fastener. The incomplete thread leaves a smooth central part of the shank with a diameter of 3.6-3.8 mm, which plays a key role in creating clamping connections. When the recessed head presses against the first part, and the thread works only in the second part, the smooth section freely passes through the first part, ensuring tight contact without gaps.

Double-start thread with variable pitch creates two parallel threads that speed up the screwing process twice compared to single-start screws. The sharp cutting edges of the threads cut into the wood structure at an optimal angle, creating maximum grip without crushing fibers. The thread depth is designed to ensure reliable holding in materials with density from 350 to 750 kg/m³, covering practically all wood species from soft pine to hard oak.

Fluting grooves and chip removal system

Longitudinal fluting grooves are machined on the smooth part of the shank of the construction screw FUR-037 — sharp notches that serve as an integrated chip breaker. During screwing, these cutting elements grab the wood shavings generated by the thread, grind them down, and expel them outward through the helical channel. This chip removal system prevents the screw from jamming deep in the hole and significantly reduces the load on the battery-powered drill.

Fluting grooves are especially important when working with dense wood species, where chip accumulation in the mounting channel creates critical rotational resistance. Without a chip removal system, the fastener may stop halfway, requiring unscrewing and reinstallation. The grooves on FUR-037 screws completely eliminate this problem, ensuring smooth insertion to full depth even when working with oak or beech.

Self-tapping tip with cutting edges

The tip of the construction screw FUR-037 is equipped with a specially chamfered tip with four cutting edges forming a cross configuration. Each cutting edge acts as a miniature drill, cutting through wood fibers and creating a guiding channel of optimal diameter. The tip chamfer angle is 25-30 degrees, ensuring easy penetration into the material structure without excessive pressure.

The self-tapping design allows screwing FUR-037 screws without pre-drilling in most wood species, including hardwoods. The cutting edges cut fibers in the direction of the fastener’s movement, minimizing internal stresses and preventing splitting even when working close to the edge of a part. The minimum distance from the edge is 25-30 mm for coniferous species and 35-40 mm for oak or ash.

Recessed head and creation of hidden connections

The head of the construction screw FUR-037 is designed in a classic recessed configuration with a conical profile. The cone angle is 60 degrees, corresponding to international standards for furniture fasteners. The head diameter of 9.5-10 mm provides sufficient bearing area for reliable pressing of connected parts without compressing soft wood. When fully tightened, the conical part enters the material’s countersink, and the flat top surface becomes flush with the surface or is recessed by 1-2 mm.

Recessed head design makes the fastener practically invisible after installation. The small depression remaining above the head can easily be covered with furniture wax, wood-colored putty, or decorative plugs. Such an invisible connection is especially valued in high-end furniture manufacturing, where visible fasteners are considered a sign of low quality. The stabilizing zone under the head with a double angle ensures proper centering during tightening and even load distribution.

TORX T-25 slot for effective torque transmission

The head of the screw FUR-037 is equipped with a TORX T-25 slot — a six-pointed star-shaped system that significantly outperforms traditional cross-shaped profiles in efficiency. The increased contact area between the bit and the slot distributes torque evenly across all six sides, eliminating point overloads and profile deformation. The slot depth is 3-4 mm, ensuring reliable bit engagement even when working at an angle up to 15 degrees from vertical.

The TORX profile prevents the bit from being ejected from the slot under high tightening forces — a problem characteristic of Phillips cross systems. The side contact of the sides allows torque transmission up to 45 Nm without risk of damaging the head or tool. For working with construction screws FUR-037, it is recommended to useprofessional TORX T-25 keyor a high-quality bit of the corresponding size made of chrome-vanadium steel.

Application in furniture manufacturing and carpentry

Construction screws 5x70 are ideally suited for assembling medium-thickness furniture frames, where parts have a cross-section of 25-40 mm. Mounting table aprons, chair legs, drawer sides, and bed support beams is performed using FUR-037 screws driven at 30-45 degree angles to create strong diagonal connections. The 70 mm length ensures that the threaded portion penetrates 40-45 mm into the second part, guaranteeing reliable connection under any operational loads.

Assembly of facade frames from 30x40 mm timber for furniture doors and drawers requires delicate fastening that does not split the material during tightening. FUR-037 screws with self-tapping tips perfectly handle this task, creating invisible strong corner joints. Installation of surface-mounted decorative elements, moldings, panels, and carved details on furniture facades is performed using 5x70 screws driven from the back of the base for complete concealment of the fastener.

Mounting shelves, drawers, and internal elements

Construction screws FUR-037 are indispensable for manufacturing pull-out drawers for chests, cabinets, and tables. Connecting drawer sides of 16-20 mm thickness to front and back panels requires fasteners 60-80 mm long — FUR-037 5x70 screws fall precisely within this range. Screwing is performed through the side of the drawer into the front panel, ensuring a strong clamping connection without using metal brackets or dowels, which spoil the appearance of the product.

Shelf mounting in cabinet furniture can be performed using construction screws driven through drawer sides into the ends of shelf boards. For shelves 18-25 mm thick, FUR-037 screws provide sufficient thread engagement depth with a free shank length of 25-30 mm. Such a connection withstands static load up to 40-50 kg per shelf when weight is properly distributed and 2-3 screws are used per side.

Furniture hardware mounting and furniture leg installation

Construction screws 5x70 are actively used during assemblyfurniture for furniture legsand fastening systems. Wooden mounting plates 15-20 mm thick are screwed into the furniture base using FUR-037 screws, which ensure deep penetration into solid wood. Metal mounting plates with flange thickness of 3-5 mm require fasteners 65-75 mm long — 5x70 screws are ideally suited for this task.

Installation of metric-threaded studs for screwing adjustable feet is performed through wooden bases secured with construction screws. A length of 70 mm allows reliably fixing a 20 mm thick base to the furniture body with a grip depth of 45-50 mm. Combination of FUR-037 screws withfurniture hardware assortmentcreates a universal mounting system for legs of any type of tables, cabinets, beds, and wardrobes.

Working with wood composite materials

Construction screws FUR-037 work effectively with MDF, MDF, MDF, and plywood of various thicknesses. When mounting into 16 mm thick particleboard, the screw creates a strong connection with a pull-out force of up to 140-160 kg. Laminate panels require special care during tightening — the recessed head must be carefully pressed into the countersink without damaging the decorative coating. The sharp cutting edges of the screw tip ensure clean penetration through laminate without chipping or delamination.

Working with MDF density 700-850 kg/m³ does not require pre-drilling — the self-tapping tip easily enters the homogeneous structure of the material. FUR-037 screws are ideal for assembling furniture from 18-25 mm thick MDF, ensuring reliable connection of frame elements. Multi-layered plywood 15-21 mm thick requires careful screwing — the screw must pass through all veneer layers without delamination, achieved thanks to the sharp tip and milling grooves.

Technology of correct installation and recommendations

To achieve maximum connection strength when working with construction screws FUR-037, certain rules should be followed. When connecting parts made of coniferous species, pre-drilling is not required — it is sufficient to mark the installation point with a center punch or awl to prevent the tip from slipping. For hardwoods, it is recommended to drill a pilot hole of 3 mm diameter to a depth of 30-35 mm to facilitate screwing and prevent splitting.

Screw installation should be performed at a speed of 800-1200 rpm with a torque limiter set at 7-9 Nm for coniferous species and 9-11 Nm for hardwoods. Using a quality cordless screwdriver with 14-18 Volt voltage ensures comfortable operation without overloading the tool. The TORX T-25 bit should be made of chrome-vanadium steel with a magnetic tip for reliable holding of the screw during installation in hard-to-reach places.

Optimal wood species and materials

Construction screws FUR-037 are universally applicable for all types of wood used in furniture manufacturing. Soft coniferous species — pine, spruce, cedar, larch — easily accept screws without any preliminary preparation, even in fully dry conditions with humidity of 8-10%. Medium-hardness hardwoods — birch, aspen, linden, osage — also do not require pilot holes when using quality tools.

Hardwood species — oak, beech, walnut, hornbeam, acacia — have high density of 650-800 kg/m³ and require a more careful approach. Pre-drilling a pilot hole of 3 mm diameter reduces the risk of splitting and facilitates screwdriver operation. When mounting near the ends of hardwoods, the distance from the edge should be at least 40 mm to prevent cracking along the grain.

Advantages of using in professional work

Construction screws FUR-037 significantly speed up furniture assembly due to the self-tapping tip and chip-removal system. Time savings per operation amount to 30-40% compared to traditional methods of fastening using metal angles or dowels. Invisible connections eliminate the need for decorative plates, reducing the cost of finished furniture and simplifying the design of the product.

High fastening strength allows reducing the number of connection points without compromising structural reliability. If traditional assembly on dowels requires 3-4 fasteners per connection, construction screws FUR-037 provide sufficient strength using only 2-3 screws. The universality of using one size 5x70 for multiple mounting tasks simplifies warehouse logistics and reduces the range of purchased materials.

Durability of connections and corrosion resistance

Connections using construction screws FUR-037 with protective zinc coating retain strength for decades without weakening or corrosion. Yellow passivation prevents rust stains on light-colored wood even under conditions of high humidity. Furniture for kitchens, bathrooms, and glass terraces assembled using FUR-037 screws retains its aesthetic appearance and functionality throughout its entire service life.

Fastener reliability reduces the number of warranty claims and complaints from customers. Structures using construction screws withstand multiple load cycles without loosening connections, which is especially important for chairs, beds, and folding furniture. Protective coating retains its properties under temperature fluctuations from -30 to +60 degrees Celsius, allowing use of screws for garden and outdoor furniture.

Compatibility with Stavros store assortment

Stavros online store offers comprehensive solutions for furniture manufacturing and carpentry, where construction screws FUR-037 perfectly complement other catalog items. Wooden mounting plates, adjustable feet of various diameters, metric-threaded studs, and fastener kits fromhardware assortmentare installed using construction screws to create strong, durable connections.

Mounting plates with a 10-degree incline are screwed into the furniture base using FUR-037 screws to create inclined supports ensuring stability on uneven surfaces. Wool and plastic feet are installed on wooden bases secured with construction screws. Studs for screwing adjustable legs are mounted through platforms secured with 5x70 screws, ensuring reliable fastening system.

Purchase construction screws 5x70, article FUR-037 at Stavros store — choice of professional furniture makers, carpenters, and woodworkers who value reliability, fast assembly, and flawless fastening connections.