AH00.00-P-0007-01SF Notes on Bolted Connections With Self Tapping Screws

AH00.00-P-0007-01SF Notes on bolted connections with self tapping screws

General:

Terms:
"Self-tapping" is the generic term and it comprises both "thread-forming" and "thread-cutting". The following covers only thread forming screws that meet the globally applicable "TAPTITE" standard.

Properties:
Thread forming screws create a screw-in thread in prefabricated core holes via typical conical crests without cutting.

The screw-in threads created by thread forming screws can easily take up screws with a metric ISO thread (standard screw).

Automatic centering during initial manual installation of self-tapping screws is given.

Repair and replacement solutions:
^ It is permissible to reuse an existing or other used thread forming screw.
^ The installation of a new thread forming screw into an already existing screw-in thread is not permissible.
^ It is permissible to replace a thread forming screw with a new or used standard screw. The length of the standard screw must be three threads (groove tip) shorter than the length of the originally installed thread forming screw.