HECO ITALIA EFG EFG 141A - Стальной винт

The attachment of strikers to aluminium drip profiles is an operation that is only apparently quick and simple.‎ The most commonly used system consists of drilling the profile with an iron point and then screwing in a standard length (12 or 15 mm) self-tapping iron screw; however, these sizes are often either too short or too long.‎ It would be quicker to use iron screws with a self-drilling bit, but other problems arise: with a 12 mm length, there is a risk that the thread is too short to grip the aluminium profile; with a 15 mm length, the risk is to reach the marble sill and thus ruin it.‎ EFG 141A avoids the need for pre-drilling.‎ Thanks to a special hardening, a special geometry of the thread start and the inclination of the drill bit, model 141A drills the aluminium profile of the drip edge with absolute ease.‎ The absence of a self-drilling iron drill bit eliminates the problem of poor grip on the profile.‎ In order to allow perfect screwing and to avoid the risk of damaging the sill surface, two lengths are available: 14 mm for strikers with screw housings perpendicular to the profile, 12 mm for strikers with offset housings.‎ The 8 mm diameter head fills the countersunk hole of the striker precisely, ensuring optimal pressure for fastening.‎