Pan Head Screws For Metal Studs

The thread geometric parameters of Pan Head Screws For Metal Studs directly affect the engagement strength with thin-walled profiles. The standard self-tapping thread profile angle is usually 60 degrees, and the pitch increases with the diameter according to ISO 1478. For example, the pitch of ST4.8 is 1.06 mm. According to the AISI S100 cold-formed steel structure design specification for self-tapping screw connections, the effective engagement length of the screw and the column should be at least three times the nominal diameter of the screw, that is, for ST5.5 screws, it must be more than 16.5 mm, otherwise the single shear load-bearing capacity will be reduced by about 25%. It has been verified by tensile shear tests that when the meshing length meets this requirement, the shear load-bearing capacity of a single screw on a column with a thickness of 2.0 mm can reach 4.2,000 N. The failure mode is pressure failure of the column plate rather than thread protrusion. Therefore, the screw length needs to be reasonably selected according to the wall thickness of the column during design to ensure sufficient thread penetration depth to fully utilize the material strength. It is especially suitable for shelf diagonal braces and seismic support systems that carry lateral loads.

In terms of installation torque control, the fluctuation of the friction coefficient has a significant impact on the accuracy of the preload force. The contact state between the supporting surface under the pan head and the column surface determines the torque conversion efficiency. According to the ISO 16047 fastener friction coefficient test method, for zinc-aluminum coated screws and galvanized posts, the typical value of the total friction coefficient is in the range of 0.15 to 0.22. When the tightening torque is set to 4.5 Nm, the axial pretightening force calculated based on the friction coefficient fluctuates between 3.5,000 N and 4.5,000 N, with a deviation of up to plus or minus 13%. If the torque-rotation angle method is used instead of simple torque control, when the rotation angle is set to 180 degrees, the preload force deviation can be reduced to less than 5%. This is due to the low sensitivity of angle control to friction factors. According to the cyclic load test of DIN EN 1935, the residual pretightening force of screws installed using this method under a transverse vibration frequency of 15 Hz still maintains more than 90% of the initial value after 100,000 vibrations. Therefore, it is preferentially used in the column connection of automobile production lines and three-dimensional garages, taking into account rapid assembly and high reliability.

Obtain drawings from customers or create drawings based on their specifications or samples.

The drawings, product raw materials, surface treatment, and other details are attested to by both parties.

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.

Hot Tags: pan head screws for metal studs, China pan head screws for metal studs manufacturers, suppliers, factory