SELF TAPPING SCREW THREAD DIMENSIONS (METRIC)

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

Metric Self Tapping Screw Sizes Chart and Calculator:

INPUT PARAMETERS
Nominal Self Tapping Screw Size	ST1.5 ST1.9 ST2.2 ST2.6 ST3.3 ST3.5 ST3.9 ST4.2 ST4.8 ST5.5 ST6.3 ST8 ST9.5

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RESULTS
Parameter	Value
Nominal Screw Size	---	---
p	---	mm
d1,max	---
d1,min	---
d2,max	---
d2,min	---
d3,max	---
d3,min	---
cmax	---
r note1	---
yref, Type C note 2	---
yref, Type F note 2	---
yref, Type R note 2	---
Number note 3	---	---

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.

Definitions:

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

Supplements:

• Thread calculators and charts
• Metric Self Tapping Screw Sizes Chart

Reference:

• ISO 1478:1999, Tapping screws thread