Specification summary of DIN 352 as applied to hand tap sets (taper, second and plug): the dimensions the standard fixes, the full size range supplied, and the related designations commonly cross-referenced.
DIN 352 — Scope
The table below lists the dimensions catalogued for hand tap sets (taper, second and plug) under DIN 352. The scope of DIN 352 itself is not summarised here — where a figure matters, confirm it against the published document.
Tolerance & Product Grades
Product grade is a concept from dimensional fastener standards and does not apply to DIN 352. Tolerances for this part are the limits shown against each dimension in the table.
Dimensions Specified by DIN 352
| Tap | Lead (chamfered threads) | Job in the sequence | Blind hole |
|---|---|---|---|
| taper (first) | about 8 – 10 threads | starts the thread square to the face | cannot reach the bottom |
| second (intermediate) | about 3 – 5 threads | cuts the working length of thread | cannot reach the bottom |
| plug (bottoming) | about 1 – 2 threads | finishes the thread to the hole bottom | this is the one that reaches |
Equivalent Standards
Where direct equivalents exist (ISO ↔ DIN, ISO ↔ ASME), they are listed on the parent Hand Tap Sets (Taper, Second and Plug) page.
Always confirm against the dimensions on this page, since some "equivalent" standards differ in tolerances and head geometry.
Companion Standards
A complete specification for hand tap sets (taper, second and plug) normally cites several documents: one for the geometry, one for the material or mechanical properties, and one for the finish. DIN 352 is one of them, not all of them.
Custom manufacturing · Made to drawing
Need a fastener tool to this standard in a non-standard size?
Parts built to DIN 352 are already in the catalog, so a special is usually a variation on existing tooling rather than a new design — which is what keeps the cost down.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
