Custom Wood To Steel Screws

Custom wood-to-steel screws feature a specially designed tapered thread structure, with head styles including countersunk and pan head options. Surfaces can be galvanized or black oxide finished as required. The front section of the shank has coarse wood threads while the rear section features fine steel threads.

Thread profiles are sharp and well-formed with deburred edges. Straight shanks facilitate alignment with mounting holes. Robust in appearance, they are engineered for dissimilar material connections between wood and steel.

 

Custom Wood To Steel Screws integrate:

• Drilling Point : Penetrates steel substrates efficiently.
• Wood Piercing Section : Allows smooth passage through timber.
• Thread Engagement Area : Creates secure mechanical locking inside steel.
• Optional Wings : The wings create clearance through wood before contacting steel, helping reduce wood lifting during installation.

 

Engineered Features for Reliable Installation

JOYEAR custom wood-to-steel screws suit a variety of wood-to-steel connection applications. Plate thickness compatibility is a key consideration for customers, and screw selection shall be based on the thickness of wood and steel sheets. Below is a selection reference chart listing the corresponding thickness ranges for light timber fixing, decking structures and heavy timber connections.

JOYEAR custom wood-to-steel screws are available with a wide range of base materials and anti-corrosion coating options, which are key concerns for overseas outdoor purchasers. Material choices include carbon steel, 410, 304 and 316 stainless steel. Available finishes such as zinc plating, Dacromet, Ruspert and black coating can be selected to suit ordinary, outdoor and coastal environments with varying corrosion levels.

Materials

JOYEAR provides examples of three types of materials for your reference.

Carbon Steel

Approval：

• General construction
• Indoor applications

Stainless Steel 410

Approval：

• Higher corrosion resistance
• Outdoor environments

Stainless Steel 304 / 316

Approval：

• Coastal areas
• Marine environments

corrosion protection

JOYEAR shows examples of available coatings for your reference.

 

Surface Treatments

Finish	Purpose
Zinc Plating	General protection
Ruspert Coating	Outdoor corrosion resistance
Dacromet	Industrial corrosion resistance
Black Coating	Appearance requirements

Provide a quote, confirm the order quantity, and include all relevant information.

Like the terms of payment, the terms of trade, the kind of packaging, etc.

When manufacturing the goods, adhere precisely to the original drawings and samples.

After a final inspection, it was meticulously packaged and delivered to the customers.

The thread geometry parameters of Custom Wood To Steel Screws are differentially designed based on the characteristics of the two connected materials. The upper half of the thread adopts a deep tooth profile to enhance the gripping force in the wood, while the lower half uses a shallow tooth profile to reduce friction resistance when tapping in the steel plate. According to the ISO 1478 regulations on the thread size of self-tapping screws, the outer diameter of the upper thread of ST5.5 screws is 5.5 mm and the thread depth is 0.8 mm. The outer diameter of the lower thread is reduced to 5.2 mm and the thread depth is 0.6 mm. This segmented design allows the screw to penetrate the wood and enter the steel plate. When the screw penetrates the wood and enters the steel plate, its effective tapping torque is about 20% lower than that of equal diameter threads. According to DIN 7500 Part 1 Test Method for Screw-in Torque, the measured peak screw-in torque is 3.2 Nm, while the comparison sample with equal diameter thread reaches 4.0 Nm. There is a scraping groove under the screw head, which can cut a tapered counterbore when the screw sinks into the wood surface, so that the head is flush with the wood surface. According to the ASTM D143 reference method for wood cross-grain compression test, this counterbore structure can expand the compressive stress distribution range of the wood surface by about 30% under the action of pretightening force, effectively reducing the risk of local crushing of wood fibers.

In terms of construction efficiency and long-term reliability, the screw's chip flute has been optimized to separate steel chips and wood chips during the process of drilling through the steel plate, preventing mixed chips from clogging the thread flanks and affecting the bite. According to actual measurement data, when the chip flute width is 25% of the thread outer diameter, the chip removal efficiency can reach 92%, which is significantly better than 76% when the flute width is 15%. Tests have shown that the optimized chip flute reduces the average time for the continuous installation of fifty screws from 7.2 minutes to 5.8 minutes. The anti-corrosion system of the screws adopts dual protection of hot-dip galvanizing and organic coating. According to the ASTM B117 salt spray test, there is still no red rust on the coating surface after two thousand hours of exposure. At the same time, after a 48-hour test according to the ISO 9227 copper accelerated acetic salt spray test, there are no corrosion spots on the thread flanks and tips.

In view of the expansion and contraction of wood due to changes in humidity, the length of the polished rod section of the screw is based on DIN 68121 specifies the axial deformation of wooden structural connectors, which is designed to be 20% of the total thickness of the wood. This non-threaded area allows the wood to freely expand and contract along the screw axis when the moisture content changes without generating additional stress. According to simulation tests, when the wood moisture content is 100% In the process of increasing from 8% to 18%, the pretightening force attenuation rate of the connection node using the polished rod design is only 4%, which is much lower than the 12% of the fully threaded screw, thus maintaining the connection stability and structural integrity during the long-term use of outdoor terraces and landscape planks.

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