Hollow metal pipe expansion screws (also known as hollow window geckos, hollow wall frame anchors), are super long type expansion screws for deep hole super thick anchoring, specially used for plastic steel doors and windows, aluminum alloy doors and windows, steel and wood structures, joists, architectural decoration ( GRC, such as Roman column, window cover), etc.; it is also the choice for fixing the floor joist keel, and it is also particularly suitable for fixing other ultra-deep and ultra-thick components.
Material and workmanship guarantee:
Screwdriver: It is made of plain carbon wire with a thin rod process of German standard (DIN), and the surface is galvanized and passivated.
Tube body: It is made of hot-dip galvanized steel coil (thickness δ=0.75-0.05) after slitting and continuous die punching.
Nut: Multi-station cold forging machine is formed at one time, and the surface is plated with color zinc.
Tension test and allowable tension:
After installing this product on the C30 bulky block, use a tensile testing machine to determine that its damage limit value should be greater than 4000N. Allowable pulling force: It is recommended that the allowable pulling force length of the segmented vertical design is less than 2500N.