Metric Self Tapping Screw Thread Dimensions according to ISO 1478.
- ISO 1478 specifies the thread and thread ends for self tapping screws (sheet metal screws) with thread sizes from ST1.5 to ST9.5 inclusive.
- Self tapping screw thread designation example for thread size ST 5.5 : Tapping screw thread ISO 1478 - ST5.5
Note 1: Dimension r is a reference. The end may not be perfectly spherical but shall not be sharp.
Note 2: Incomplete thread length.
Note 3: Former thread designation, for information only.
Self tapping screw: A type of screw which can tap its own hole as it is screwed into it.
Self tapping screw thread end alternatives:
Metric self tapping screw thread ends